JP2019204019A - Display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve display quality without requiring a specially designed part. A liquid crystal display device (10) includes a liquid crystal panel (11), a display drive unit (24), position information in the column direction of pixel units (PX), and gradation values of two pixel units (PX) adjacent in the column direction. The display driving unit 24 includes a storage unit 25 that stores the first correction processing 33 that obtains a first correction gradation value based on the gradation values of the two pixel units PX, and the floor of the two pixel units PX. A bright / dark separation process 34 of storing a target grayscale value obtained by separating the two pixel portions PX into a bright pixel portion HPX and a dark pixel portion LPX based on the tonal value, and the bright pixel portion HPX and dark. With reference to the target grayscale value of the pixel portion LPX and the position information in the column direction of the rear bright pixel portion HPX or the dark pixel portion LPX, the target grayscale value of the rear bright pixel portion HPX or the dark pixel portion LPX is referred to. Second, the execution gradation value obtained by correcting A positive process 35, is carried out. [Selection diagram] Fig. 6

Description

  The present invention relates to a display device and a television receiver.

  As an example of a conventional liquid crystal display device, one described in Patent Document 1 below is known. In the liquid crystal display device described in Patent Document 1, a plurality of source driving circuits including driving ICs are connected to the periphery of a liquid crystal display panel, and an external power supply voltage is adjacent to a specific source driving circuit. Wiring that is sequentially supplied to the driving circuit and is substantially equivalent to the signal wiring from the driving IC to the driving IC adjacent downstream in the voltage supply direction with respect to the driving IC located upstream in the voltage supply direction Resistance calculation wiring is formed. The driving IC calculates a wiring resistance value by outputting a calculation voltage to one end of the wiring resistance calculation wiring and detecting a voltage at the other end, and calculates a voltage drop value based on the calculated wiring resistance value. Then, the power supply voltage whose voltage value is increased by the calculated voltage drop value is output to the downstream drive IC.

JP 2005-284026 A

  According to the above-described liquid crystal display device described in Patent Document 1, a drop in power supply voltage that is sequentially transmitted is prevented and malfunction of the driving IC is prevented, so that display quality can be improved. However, since a dedicated wiring resistance calculation wiring is required to calculate the wiring resistance value, an FPC with a dedicated design is required, which tends to increase the cost, and when high definition is advanced, for wiring resistance calculation It may be difficult to secure a wiring arrangement space.

  The present invention has been completed based on the above circumstances, and an object thereof is to improve display quality without requiring a specially designed part.

  The display device of the present invention includes a display component having a display surface in which a plurality of pixel units are arranged in a matrix, a display drive unit that sequentially drives the plurality of pixel units in the column direction, and the plurality of pixel units A storage unit that stores at least the position information about the column direction in the surface of the display surface and the gradation values of the n-th and (n + 1) -th pixel units in the column direction. The display driving unit refers to the gradation value of each of the nth and (n + 1) th pixel units from the storage unit and refers to the gradation of the (n + 1) th pixel unit. A first correction process for storing the first correction gradation value obtained by correcting the value in the storage unit; and the gradation value of each of the nth and (n + 1) th pixel units from the storage unit. Based on this, the nth pixel unit The target gradation of the bright pixel portion and the dark pixel portion obtained by separating the (n + 1) th pixel portion into a bright pixel portion having a relatively high luminance and a dark pixel portion having a relatively low luminance. A light / dark separation process for storing values in the storage unit, and the target gradation values of the nth and (n + 1) th bright pixel parts and the dark pixel parts, which are performed after the light / dark separation process, The (n + 1) -th bright pixel section or the dark pixel section with reference to the position information about the column direction in the plane of the display surface from the storage section, the (n + 1) -th bright pixel section Correction processing for storing the (n + 1) th bright pixel portion or dark pixel portion effective gradation value obtained by correcting the target gradation value of the pixel portion or the dark pixel portion in the storage portion; Do at least.

  In this way, a plurality of pixel units arranged in a matrix within the display surface of the display component are sequentially displayed and driven in the column direction by the display driving unit, whereby a predetermined image is displayed on the display surface. The Specifically, when the first correction process is performed by the display driving unit, the gradation value of the (n + 1) th pixel unit is corrected based on the gradation value of each of the nth and (n + 1) th pixel units in the column direction. Thus, the first corrected gradation value is obtained. The obtained first corrected gradation value is stored in the storage unit. Here, for example, when a black (minimum gradation value) or white (maximum gradation value) character and a background of an intermediate gradation value adjacent to the character are displayed on the display surface, a pixel unit that displays the character Since the gradation difference between the pixel portion displaying the background and the pixel portion displaying the background becomes large, the display gradation of the pixel portion displaying the background adjacent to the pixel portion displaying the character may deviate from the target value. . On the other hand, if the first correction process described above is performed, the display gradation of the pixel portion that is adjacent to the pixel portion that displays the character and that displays the background is corrected to be close to the target value. Excellent display quality can be obtained.

  On the other hand, when the light / dark separation process is performed by the display driving unit, the nth pixel unit and the (n + 1) th pixel are based on the gradation values of the nth and (n + 1) th pixel units stored in the storage unit. Are separated into a bright pixel portion having a relatively high luminance and a dark pixel portion having a relatively low luminance. The bright pixel portion and the dark pixel portion are set such that the average gradation of the respective target gradation values is an average value of the gradation values of the nth and (n + 1) th pixel portions. The target gradation values of the bright pixel portion and the dark pixel portion are stored in the storage portion. Thereby, since display using the average gradation of the bright pixel portion and the dark pixel portion adjacent to each other in the column direction can be performed, the viewing angle characteristic is excellent.

  By the way, when the n-th pixel portion and the (n + 1) -th pixel portion adjacent to each other in the column direction are separated into the bright pixel portion and the dark pixel portion in the above-described light-dark separation processing, Display gradation may deviate from the target gradation value. In addition, a voltage drop is more likely to occur in the pixel portion far from the display drive unit in the column direction than in the pixel unit close to the display drive unit in the column direction. There is a possibility of getting out of place. In that regard, when the second correction process is performed by the display driver after the light / dark separation process, the target gradation values of the nth and (n + 1) th bright pixel parts and dark pixel parts in the column direction, and (n + 1) Based on position information in the column direction in the plane of the display surface in the first bright pixel portion or dark pixel portion, the target gradation value of the (n + 1) th bright pixel portion or dark pixel portion is corrected and executed. A gradation value is obtained. By driving the (n + 1) th bright pixel portion or dark pixel portion based on the effective gradation value stored in the storage portion, there is a difference in brightness between the nth dark pixel portion or the bright pixel portion. Even if it occurs, the actual display gradation of the (n + 1) th bright pixel portion or dark pixel portion can be brought close to the target gradation value, and excellent display quality can be obtained. Moreover, since the effective gradation value of the (n + 1) th bright pixel portion or dark pixel portion is corrected according to the position in the column direction, the actual display gradation is the target due to the voltage drop. Situations that deviate from the gradation value are less likely to occur. As described above, display quality can be improved without requiring a specially designed part as in the prior art. Note that “n” described above is a natural number.

  According to the present invention, display quality can be improved without requiring a specially designed component.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Plan view of liquid crystal panel, flexible substrate and control substrate constituting liquid crystal display device included in television receiver Schematic sectional view of the liquid crystal panel The top view which shows the wiring structure in the display area of the array board | substrate which comprises a liquid crystal panel Block diagram showing the relationship of the configuration related to the display drive of the liquid crystal panel The figure showing the processing procedure about the display drive of a liquid crystal panel The figure which shows the 2nd correction data table memorize | stored in the memory | storage part. The figure which shows the 3rd correction data table memorize | stored in the memory | storage part. The figure showing the time change of the electric potential concerning the image signal transmitted to source wiring The figure showing the process sequence regarding the display drive of the liquid crystal panel which concerns on Embodiment 2 of this invention. The figure showing the process sequence regarding the display drive of the liquid crystal panel which concerns on Embodiment 3 of this invention. The figure showing the process sequence regarding the display drive of the liquid crystal panel which concerns on Embodiment 4 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, the upper side shown in FIG. 3 etc. is made into the front side, and the lower side of the figure is made into the back side.

  As shown in FIG. 1, a television receiver 10TV according to this embodiment includes a liquid crystal display device 10 having a horizontally long and substantially square shape, and both front and back cabinets 10C1 and 10C2 that are accommodated so as to sandwich the liquid crystal display device 10. , A power source 10P, a tuner (reception unit) 10T that receives a television signal, and a stand 10S. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 having a display surface 11DS for displaying an image, and a backlight device (illumination device) that supplies light for display to the liquid crystal panel 11. And these are integrally held by a frame-like bezel (not shown with the backlight device). The backlight device is disposed on the back side (back side) with respect to the liquid crystal panel 11 and imparts an optical action to a light source (such as an LED) that emits white light (white light) or light from the light source. An optical member that converts to planar light is included.

  Next, the liquid crystal panel 11 will be described. As shown in FIG. 2, the liquid crystal panel 11 includes a display area (active area) AA that is configured by a central portion of the display surface 11DS and displays an image, and a display area that includes an outer peripheral portion of the display surface 11DS. It is divided into a non-display area (non-active area) NAA that forms a frame shape (frame shape) surrounding AA and displays no image. In FIG. 2, the range surrounded by the alternate long and short dash line is the display area AA. The liquid crystal panel 11 is formed by bonding a pair of substantially transparent (translucent) glass substrates 11A and 11B. Of the pair of substrates 11A and 11B, the front side (front side) is a CF substrate (counter substrate) 11A, and the back side (back side) is an array substrate (active matrix substrate) 11B. The CF substrate 11A has a short side dimension smaller than the same dimension as the array substrate 11B, and has one short side end in the Y-axis direction (upper side shown in FIG. 2) aligned with the array substrate 11B. It is pasted in the state. Therefore, the other side (lower side shown in FIG. 2) in the Y-axis direction of the array substrate 11B is the CF substrate non-overlapping portion 11B1 where the CF substrate 11A does not overlap. On the CF substrate non-overlapping portion 11B1, the other end side of the flexible substrate 21 whose one end side is connected to the control substrate 22 which is a signal supply source is mounted. The flexible substrate 21 has flexibility by including a film-like base material made of a synthetic resin material (for example, a polyimide-based resin). The wiring pattern (not shown) is routed and formed. Since the flexible substrate 21 is bent in a folded shape from the state shown in FIG. 2, the control substrate 22 is disposed on the back side of the backlight device. The driver 23 is mounted on the flexible substrate 21 by COF (Chip On Film). The driver 23 is composed of an LSI chip having a drive circuit therein, processes various signals transmitted from the control board 22, and outputs them to the liquid crystal panel 11.

  As shown in FIG. 3, in addition to a pair of substrates 11A and 11B, the liquid crystal panel 11 is interposed between the substrates 11A and 11B, and is a liquid crystal molecule (liquid crystal material) that is a substance whose optical characteristics change with application of an electric field. The liquid crystal layer 11C includes a liquid crystal layer 11C and a seal that extends in the circumferential direction so as to seal the periphery of the liquid crystal layer 11C and that bonds both substrates 11A and 11B while maintaining a gap corresponding to the thickness of the liquid crystal layer 11C. Part (not shown). The liquid crystal panel 11 can display an image on the display area AA using light supplied from the backlight device, and the front side is the light output side. In addition, the polarizing plate 12 is affixed on the outer surface side of both board | substrates 11A and 11B, respectively.

  Of both the substrates 11A and 11B constituting the liquid crystal panel 11, the front side (front side) is the CF substrate 11A, and the back side (back side) is the array substrate 11B. On the inner surface side of the display area AA of the array substrate 11B (the liquid crystal layer 11C side and the surface facing the CF substrate 11A), as shown in FIGS. 3 and 4, TFTs (Thin Film Transistors) as switching elements are provided. A large number of display elements) 13 and pixel electrodes 14 are arranged in a matrix (matrix) along the X-axis direction (row direction) and Y-axis direction (column direction). Around the gate wiring (scanning wiring) 15 and source wiring (signal wiring, data wiring) 16 are arranged so as to surround. The gate wiring 15 extends substantially linearly along the X-axis direction and transmits a scanning signal, whereas the source wiring 16 extends substantially linearly along the Y-axis direction and is an image. Transmit the signal. The gate line 15 is connected to the gate electrode of the TFT 13, the source line 16 is connected to the source electrode of the TFT 13, and the pixel electrode 14 is connected to the drain electrode of the TFT 13. The TFT 13 is driven when a scanning signal is supplied from the gate wiring 15, and supplies the image signal supplied to the source wiring 16 to the pixel electrode 14, thereby charging the pixel electrode 14 to a potential based on the image signal. To do. The pixel electrode 14 is disposed in a substantially rectangular region surrounded by the gate wiring 15 and the source wiring 16 and is made of a transparent electrode film such as ITO (Indium Tin Oxide) or ZnO (Zinc Oxide). Become. As described above, a large number of pixel electrodes 14 are arranged side by side along the X-axis direction and the Y-axis direction. Of these, a large number of pixel electrodes 14 are arranged linearly along the Y-axis direction. The common source line 16 is connected via the TFT 13. Therefore, the group of pixel electrodes 14 forming a column along the Y-axis direction receives the image signal from the common source line 16.

  On the other hand, on the inner surface side of the display area AA of the CF substrate 11A, as shown in FIG. 3, a large number of color filters 17 are arranged in a matrix at positions facing the pixel electrodes 14 on the array substrate 11B side. It is provided side by side. The color filters 17 are arranged in red, green, and blue (R, G, B) colors that are repeatedly arranged in a predetermined order. Each color filter 17 selectively transmits light in a specific wavelength range related to each color. That is, the red color filter (red color filter) 17 emits light in the red wavelength region, the green color filter (green color filter) 17 transmits light in the green wavelength region, and the blue color filter (blue color filter). ) 17 selectively transmits light in the blue wavelength region. Between each color filter 17, a lattice-shaped light shielding layer (black matrix) 18 for preventing color mixture is formed. The light shielding layer 18 is arranged so as to overlap with the above-described gate wiring 15 and source wiring 16 in a plan view. On the surface of the color filter 17 and the light shielding layer 18, a solid counter electrode 19 is provided to face the pixel electrode 14 on the array substrate 11B side. The counter electrode 19 is always kept at a constant reference potential. An alignment film 20 for aligning liquid crystal molecules contained in the liquid crystal layer 11C is formed on the inner surfaces of both the substrates 11A and 11B.

  In the liquid crystal panel 11, as shown in FIG. 3, the color filter 17 and the pixel electrode 14 facing the color filter 17 constitute a pixel portion PX. The pixel unit PX exhibits a display color corresponding to the color exhibited by the color filter 17. Specifically, a red pixel portion (red pixel portion) PX that has a red color filter 17 has a red display color, and a green pixel that has a green color filter 17 has a green display color. A pixel portion (green pixel portion) PX having a blue color filter 17 is a blue pixel portion (blue pixel portion) PX having a blue display color. In FIG. 2, the red color filter 17 and the pixel portion PX are “R”, the green color filter 17 and the pixel portion PX are “G”, and the blue color filter 17 and the pixel portion PX are “B”. ", Respectively. Each of the red, green, and blue pixel portions PX is repeatedly arranged along the X-axis direction (row direction), and those of the same color are continuously arranged along the Y-axis direction (column direction). It is arranged with. Thereby, in the liquid crystal panel 11, a large number of pixel portions PX having different colors are arranged in a matrix. In the liquid crystal panel 11, display pixels capable of color display with a predetermined gradation are configured by the pixel portions PX of red, green, and blue adjacent to each other along the Y-axis direction. Each pixel electrode 14 constituting each color pixel portion PX is charged to a potential based on an image signal supplied from the source wiring 16 by driving the connected TFT 13, and the potential difference between the potential and the reference potential of the counter electrode 19 is set. Based on this, the alignment state of the liquid crystal layer 11C in the pixel portion PX of each color changes, so that the transmitted light amount, that is, the display gradation of the liquid crystal panel 11 is individually controlled for each pixel portion PX of each color. Each gate line 15 and each source line 16 connected to each TFT 13 has a display driver 24 (see FIG. 2) provided on the control substrate 22 (see FIG. 2) via a flexible substrate 21 connected to the end of the array substrate 11B. The scanning signal and the image signal are supplied from (see FIG. 5). The display driving unit 24 sequentially drives the TFTs 13 by sequentially supplying scanning signals from the upper side shown in FIG. 4 to the gate wirings 15 and, for example, according to the display gradation of each pixel unit PX. An image signal of 256 gradations having gradation values of 0 to 255 is supplied to each source wiring 16.

  Here, specific display driving in the liquid crystal panel 11 will be described. As shown in FIG. 4, the display drive unit 24 provided in the control board 22 includes a plurality of pixel units PX, a relatively high luminance (bright) bright pixel unit HPX, and a relatively low luminance (dark) darkness. Display driving is performed so as to include the pixel portion LPX. Specifically, in the display drive unit 24, the pixel unit PX adjacent in the Y-axis direction becomes the bright pixel unit HPX and the dark pixel unit LPX, and the pixel unit PX adjacent in the X-axis direction becomes the bright pixel unit HPX and the dark pixel unit. Display driving is performed so as to be LPX. Then, the display driving unit 24 performs display driving so that the average gradation of the display gradation of the bright pixel portion HPX and the display gradation of the dark pixel portion LPX adjacent to each other in the Y-axis direction becomes the target display gradation. ing. As a result, the luminance (brightness) perceived by the user is equalized when the user views the display surface 11DS of the liquid crystal panel 11 from any angle, and thus the viewing angle correction is performed. Can be planned. The display driving unit 24 performs inversion driving that periodically inverts the polarity of the image signal for each pixel unit PX, thereby preventing deterioration of the liquid crystal layer 11C.

  Incidentally, as described above, when display driving is performed in which the pixel portion PX adjacent in the Y-axis direction is the bright pixel portion HPX and the dark pixel portion LPX, it is caused by the gradation difference between the bright pixel portion HPX and the dark pixel portion LPX. As a result, the actual display gradation may deviate from the target gradation value. For example, when a low gradation image signal is supplied to the dark pixel portion LPX immediately after a high gradation image signal is supplied to the bright pixel portion HPX by the source wiring 16, the actual display gradation in the dark pixel portion LPX is changed to the target floor. It tends to be higher than the key value. On the other hand, if a high gradation image signal is supplied to the bright pixel portion HPX immediately after the low gradation image signal is supplied to the dark pixel portion LPX by the source wiring 16, the actual display gradation in the bright pixel portion HPX is the target. It tends to be lower than the gradation value. In addition, the source wiring 16 transmits an image signal output from the driver 23 mounted on the flexible substrate 21. Compared with the pixel unit PX disposed near the driver 23, the pixel disposed far from the driver 23. In the part PX, there is a possibility that a voltage drop due to the wiring resistance occurs. In other words, the longer the wiring length of the source wiring 16 from the driver 23 to the pixel portion PX, the greater the influence of the voltage drop that occurs. As a result, the actual display gradation in the pixel portion PX is higher than the target gradation value. It tends to be lower. Note that the lower pixel portion PX shown in FIG. 4 is arranged close to the driver 23, and the upper pixel portion PX shown in FIG. 4 is arranged far from the driver 23.

  Therefore, the liquid crystal display device 10 according to the present embodiment sequentially performs the processing illustrated in FIG. 6 by the display driving unit 24 and the storage unit 25 provided on the control board 22 as illustrated in FIG. Display drive of the pixel portion PX is performed. The display driving unit 24 uses the information stored in the storage unit 25, so that the digital unevenness correction process 30, the digital gamma process 31, the overshoot process 32, and the first correction process 33 are performed as shown in FIG. Then, the light / dark separation process 34, the second correction process 35, and the analog gamma process 36 are sequentially performed. Among these, in the digital unevenness correction processing 30, for example, the gradation value is increased and the gradation value is extremely high for a portion where the gradation value (luminance) is extremely low based on the luminance distribution information included in the television broadcast wave. The correction for lowering the gradation value is performed for the portion. In the digital gamma processing 31, for example, digital data relating to a television broadcast wave is converted using a gamma curve adapted to the display characteristics of the liquid crystal panel 11. In the overshoot process 32, the image signal supplied to the pixel unit PX is corrected so as to have an overshoot characteristic in which the rising voltage is excessively applied in a pulse manner. As a result, the response speed of the liquid crystal molecules contained in the liquid crystal layer 11C is accelerated particularly during halftone display, and the moving image display performance is excellent. Although details will be described later in the first correction processing 33, when a character is included in an image displayed on the display surface 11DS, the display floor of the pixel unit PX that displays a background adjacent to the pixel unit PX that displays the character. The key is corrected. Thereby, it is possible to prevent bleeding around the character. In the light / dark separation process 34, as will be described in detail later, two pixel portions PX adjacent in the Y-axis direction are separated into a bright pixel portion HPX and a dark pixel portion LPX. In the second correction process 35, details will be described later, but the target gradation values in the bright pixel portion HPX and the dark pixel portion LPX adjacent in the Y-axis direction are corrected and executed based on position information in the Y-axis direction. The gradation value is obtained. In the analog gamma processing 36, the effective gradation value of each pixel unit PX obtained through the second correction processing 35 is converted into a voltage value that is analog data, that is, an image signal that is actually supplied to the source wiring 16.

  Next, the first correction process 33, the light / dark separation process 34, and the second correction process 35 will be described in detail. First, in the storage unit 25 shown in FIG. 5, in the display area AA, position information about the Y-axis direction in a large number of pixel units PX arranged along the Y-axis direction and two pixels adjacent to each other in the Y-axis direction. The gradation value by the group of the part PX is stored at least, and the display driving unit 24 sequentially drives the pixel part PX in the Y-axis direction based on the information. In the first correction process 33, the display driving unit 24 includes the nth and (n + 1) th pixel units PX counted from the upper side (the driving start side by the display driving unit 24) shown in FIG. The gradation value and the positional information about the X axis direction and the Y axis direction in the surface of the display surface 11DS regarding these two pixel portions PX are referred to from the storage unit 25. In the first correction processing 33, the display driving unit calculates the level of the (n + 1) th pixel unit PX based on the gradation values of the nth and (n + 1) th pixel units PX and the position information described above. The tone value is converted into the first corrected gradation value, and the converted first corrected gradation value is stored in the storage unit 25. By repeating this, the first corrected gradation values of all the pixel units PX are stored in the storage unit 25. In this way, for example, when a black (minimum gradation value) or white (maximum gradation value) character and an intermediate gradation value background adjacent to the character are displayed on the display surface 11DS, the character is displayed. Even if the gradation difference between the pixel portion PX for displaying and the pixel portion PX for displaying the background is large, the display gradation of the pixel portion PX for displaying the background adjacent to the pixel portion PX for displaying characters is displayed. Can be corrected appropriately. Accordingly, the pixel portion PX that is adjacent to the pixel portion PX and displays the background can be driven to display with a gradation close to the target gradation, and an excellent display quality can be obtained.

  In the light / dark separation process 34, the first corrected gradation value (the gradation value that has passed through the first correction process 33) stored in the storage unit 25 is referred to, and the nth pixel unit is based on the first corrected gradation value. The PX and the (n + 1) th pixel portion PX are separated into a bright pixel portion HPX having a relatively high luminance and a dark pixel portion LPX having a relatively low luminance. When the nth pixel portion PX becomes the bright pixel portion HPX, the (n + 1) th pixel portion PX becomes the dark pixel portion LPX, and conversely, when the nth pixel portion PX becomes the dark pixel portion LPX, The (n + 1) th pixel portion PX becomes the bright pixel portion HPX. Specifically, for example, when the first corrected gradation value stored in the storage unit 25 is 128 gradations, the target gradation value of the bright pixel unit HPX is 140 gradations, and the target floor of the dark pixel unit LPX is Bright and dark separation processing is performed so that the tone value becomes 116 gradations. That is, the bright pixel portion HPX and the dark pixel portion LPX are values obtained by averaging the first corrected gradation values of the n-th and (n + 1) -th two pixel portions PX with the average gradation of each target gradation value. It is set as follows. The target gradation values of the bright pixel portion HPX and dark pixel portion LPX obtained in the light / dark separation process 34 are stored in the storage portion 25. Thereby, since display using the average gradation of the bright pixel portion HPX and the dark pixel portion LPX adjacent in the Y-axis direction can be performed, the viewing angle characteristics are excellent.

  The second correction processing 35 includes the target gradation value of each of the nth and (n + 1) th pixel units PX (bright pixel unit HPX and dark pixel unit LPX) and the (n + 1) th pixel unit PX (bright pixel unit HPX). Alternatively, the position information about the Y-axis direction in the plane of the display surface 11DS in the dark pixel portion LPX) and the second correction data table (correction data table) are referred to from the storage unit 25. As shown in FIG. 7, the second correction data table serves as a reference for the target gradation value of each of the nth and (n + 1) th pixel units PX and the effective gradation value of the (n + 1) th pixel unit PX. The relationship with the reference execution gradation value is described. The reference execution gradation value described in the second correction data table is set with reference to the pixel unit PX at the driving end position of the display driving unit 24 in the Y-axis direction within the surface of the display surface 11DS. The display driving unit 24 refers to the second correction data table stored in the storage unit 25 and acquires the reference execution gradation value. For example, the target gradation value of the nth pixel portion PX (dark pixel portion LPX) is 116 gradations, and the target gradation value of the (n + 1) th pixel portion PX (bright pixel portion HPX) is 140 gradations. In some cases, the 150 gradations described at the intersection of the two target gradation values in the second correction data table are extracted as the reference execution gradation values.

  Subsequently, the display driving unit 24 uses the third correction data table stored in the storage unit 25 and the (n + 1) th pixel unit PX in the Y-axis direction based on the reference execution gradation value obtained as described above. Is corrected to an effective gradation value based on the positional information on In the third correction data table, as shown in FIG. 8, correction coefficients corresponding to position information in the Y-axis direction in the (n + 1) th pixel unit PX are described. The correction coefficients are individually set for ten areas from the first area to the tenth area obtained by dividing the display surface 11DS in the Y-axis direction. The first region exists on the drive start end side by the display drive unit 24, while the tenth region exists on the drive end end side by the display drive unit 24. The correction coefficient is set to the minimum value “0.1” in the first area and is set to the maximum value “1.0” in the tenth area. In other words, the correction coefficient described in the third correction data table is set with reference to the pixel unit PX in the tenth region (the drive end position of the display drive unit 24). Then, the display driving unit 24 calculates a difference between the reference execution gradation value extracted from the second correction data table and the target gradation value in the (n + 1) th pixel unit PX, and the difference is calculated based on the difference. The second correction gradation value is acquired by multiplying the correction coefficient extracted from the three correction data table.

  Then, the display driving unit 24 obtains the effective gradation value by adding the obtained second corrected gradation value to the target gradation value in the (n + 1) th pixel unit PX. For example, when the reference execution gradation value is 150 gradations and the target gradation value in the (n + 1) th pixel unit PX is 140 gradations, 10 gradations are obtained as the difference. When the (n + 1) -th pixel portion PX is arranged in the tenth region, 10 gradations are obtained as the second correction gradation value by multiplying the difference 10 gradations by the correction coefficient 1.0. It is done. Therefore, by adding the 10 gradations that are the second correction gradation values to the 140 gradations that are the target gradation values in the (n + 1) th pixel unit PX, 150 gradations are obtained as the effective gradation values. . On the other hand, when the (n + 1) th pixel portion PX is arranged in the first region, the second correction gradation value is 1 by multiplying the difference 10 gradations by the correction coefficient 0.1. A gradation is obtained. Accordingly, 141 gradations can be obtained as the effective gradation value by adding one gradation that is the second correction gradation value to 140 gradation that is the target gradation value in the (n + 1) th pixel portion PX. . Thus, the effective gradation value obtained by correcting the target gradation value of the (n + 1) th pixel unit PX is stored in the storage unit 25. Thereafter, in the analog gamma processing 36, the effective gradation value of each pixel unit PX stored in the storage unit 25 is converted into an image signal that is actually supplied to the source wiring 16. In this way, the image signal supplied from the source wiring 16 to the TFT 13 becomes a rectangular wave having a steep rising shape and falling shape, as shown by the solid line in FIG. The two-dot chain line in FIG. 9 represents the waveform of the image signal when the second correction processing 35 is not performed. Compared with this waveform, the waveform of the image signal obtained by performing the second correction processing 35 is The dullness is reduced, and the pixel electrode 14 can be charged to an appropriate voltage (gradation value). Thereby, an excellent display quality can be obtained.

  As described above, the liquid crystal display device (display device) 10 of this embodiment includes the liquid crystal panel (display component) 11 having the display surface 11DS in which the plurality of pixel portions PX are arranged in a matrix, and the plurality of pixel portions PX. Display drive unit 24 that sequentially drives display in the column direction, position information about the column direction in the surface of the display surface 11DS in the plurality of pixel units PX, and the driving order in the column direction are nth and (n + 1) th Storage unit 25 that stores at least the gradation value of each pixel unit PX. The display driving unit 24 stores the gradation value of each of the nth and (n + 1) th pixel units PX from the storage unit 25. The first correction processing 33 for storing the first correction gradation value obtained by correcting the gradation value of the (n + 1) th pixel unit PX with reference to the storage unit 25, and the nth and (n + 1) th each The gradation value of the pixel unit PX is stored in the storage unit 25. Based on this, the n-th pixel part PX and the (n + 1) -th pixel part PX are separated into a relatively high-brightness bright pixel part HPX and a relatively low-brightness dark pixel part LPX. The bright and dark separation process 34 for storing the target gradation values of the bright pixel part HPX and the dark pixel part LPX obtained in the storage unit 25 and the nth and (n + 1) th bright pixel parts performed after the bright and dark separation process 34 Reference from the storage unit 25 is the target gradation value of the HPX and dark pixel portion LPX and the position information about the column direction in the plane of the display surface 11DS in the (n + 1) th bright pixel portion HPX or dark pixel portion LPX. The execution gradation value of the (n + 1) th bright pixel portion HPX or dark pixel portion LPX obtained by correcting the target gradation value of the (n + 1) th bright pixel portion HPX or dark pixel portion LPX is stored in the storage unit 25. Second correction processing 35 to be stored in The phrase is also performed.

  In this way, the plurality of pixel portions PX arranged in a matrix within the surface of the display surface 11DS of the liquid crystal panel 11 are sequentially driven in the column direction by the display driving unit 24, whereby the display surface 11DS has a predetermined value. Is displayed. Specifically, when the first correction process 33 is performed by the display driving unit 24, the level of the (n + 1) th pixel unit PX is determined based on the gradation value of each of the nth and (n + 1) th pixel units PX in the column direction. The tone value is corrected to obtain the first corrected gradation value. The obtained first corrected gradation value is stored in the storage unit 25. Here, for example, when a black (minimum gradation value) or white (maximum gradation value) character and a background of an intermediate gradation value adjacent to the character are displayed on the display surface 11DS, pixels for displaying the character Since the gradation difference between the portion PX and the pixel portion PX that displays the background increases, the display gradation of the pixel portion PX that is adjacent to the pixel portion PX that displays the character and displays the background starts from the target value. There is a possibility of deviation. On the other hand, if the first correction processing 33 is performed, the display gradation of the pixel portion PX that is adjacent to the pixel portion PX that displays characters and that displays the background is corrected, and thus is close to the target value. Thus, excellent display quality can be obtained.

  On the other hand, when the light / dark separation process 34 is performed by the display driving unit 24, the nth pixel unit PX and the (n + 1) th pixel unit PX based on the gradation values of the nth and (n + 1) th pixel units PX stored in the storage unit 25 ( The (n + 1) th pixel portion PX is separated into a bright pixel portion HPX having a relatively high luminance and a dark pixel portion LPX having a relatively low luminance. The bright pixel portion HPX and the dark pixel portion LPX are set so that the average gradation of each target gradation value is an average value of the gradation values of the nth and (n + 1) th pixel portions PX. The target gradation values of the bright pixel unit HPX and the dark pixel unit LPX are stored in the storage unit 25. Thereby, since display using the average gradation of the bright pixel portion HPX and the dark pixel portion LPX adjacent in the column direction can be performed, the viewing angle characteristics are excellent.

  By the way, when the n-th pixel portion PX and the (n + 1) -th pixel portion PX adjacent to each other in the column direction are separated into the bright pixel portion HPX and the dark pixel portion LPX in the light / dark separation processing 34 described above, the difference in lightness and darkness is determined. As a result, the actual display gradation may deviate from the target gradation value. In addition, the pixel portion PX far from the display driving unit 24 in the column direction is more likely to cause a voltage drop than the pixel unit PX close to the display driving unit 24 in the column direction. There is a possibility of deviation from the target gradation value. In that respect, when the second correction process 35 is performed by the display driving unit 24 after the light / dark separation process 34, the target gradation values of the nth and (n + 1) th bright pixel part HPX and dark pixel part LPX in the column direction. And (n + 1) th bright pixel portion HPX or dark pixel portion LPX based on the position information in the column direction in the plane of the display surface 11DS in the (n + 1) th bright pixel portion HPX or dark pixel portion LPX. The target gradation value is corrected to obtain the effective gradation value. The (n + 1) th bright pixel portion HPX or dark pixel portion LPX is driven based on the execution gradation value stored in the storage portion 25, so that it is connected to the nth dark pixel portion LPX or bright pixel portion HPX. Even if there is a difference in brightness, the actual display gradation of the (n + 1) th bright pixel portion HPX or dark pixel portion LPX can be brought close to the target gradation value, and an excellent display quality can be obtained. In addition, since the effective gradation value of the (n + 1) th bright pixel portion HPX or dark pixel portion LPX is corrected according to the position in the column direction, the actual display gradation is caused by the voltage drop. Is less likely to deviate from the target gradation value. As described above, display quality can be improved without requiring a specially designed part as in the prior art. Note that “n” described above is a natural number.

  The storage unit 25 also stores target gradation values of the nth and (n + 1) th bright pixel units HPX and dark pixel unit LPX, and an execution gradation value of the (n + 1) th bright pixel unit HPX or dark pixel unit LPX. The second correction data table (correction data table) describing the relationship with the reference execution gradation value serving as the reference is stored in the storage unit 25 in the second correction process 35. The reference execution gradation value is obtained by referring to the second correction data table, and the reference execution gradation value is obtained based on the position information in the column direction in the (n + 1) th bright pixel portion HPX or dark pixel portion LPX. Correct to the effective gradation value. In this way, when the second correction process 35 is performed, the display driving unit 24 refers to the second correction data table stored in the storage unit 25 and refers to the nth and (n + 1) th bright columns in the column direction. Based on the target gradation values of the pixel part HPX and the dark pixel part LPX, the reference execution gradation value of the (n + 1) th bright pixel part HPX or dark pixel part LPX is acquired. The reference execution gradation value is an execution gradation value in the pixel portion PX arranged at a predetermined position in the column direction, and is a value serving as a reference for correction based on position information in the column direction described below. Then, the display driving unit 24 corrects the reference execution gradation value to the execution gradation value based on the position information about the column direction in the (n + 1) th bright pixel part HPX or dark pixel part LPX. As described above, since the reference execution gradation value obtained by referring to the second correction data table is used, the processing can be simplified.

  Further, the storage unit 25 stores a correction coefficient corresponding to the position in the column direction in the (n + 1) th bright pixel unit HPX or dark pixel unit LPX, and the display driving unit 24 performs the second correction process 35. The reference execution gradation value and the target gradation in the (n + 1) th bright pixel part HPX or dark pixel part LPX are referenced from the storage unit 25 with reference to the correction coefficient in the (n + 1) th bright pixel part HPX or dark pixel part LPX. The execution gradation value is obtained by adding the second correction gradation value obtained by multiplying the difference from the value by the correction coefficient to the target gradation value in the (n + 1) th bright pixel portion HPX or dark pixel portion LPX. . In this way, when the second correction process 35 is performed, the display driving unit 24 uses the reference execution gradation value obtained by referring to the second correction data table and the (n + 1) th bright pixel unit HPX or darkness. By multiplying the difference from the target gradation value in the pixel portion LPX by the correction coefficient corresponding to the position information in the column direction in the (n + 1) th bright pixel portion HPX or dark pixel portion LPX, the second correction gradation Get the value. Then, the display driving unit 24 adds the obtained second correction gradation value and the target gradation value in the (n + 1) th bright pixel part HPX or dark pixel part LPX, thereby obtaining an effective gradation value. Have gained.

  In addition, the storage unit 25 uses the pixel unit PX in which the reference execution gradation value and the correction coefficient described in the second correction data table are at the driving end position of the display driving unit 24 among the plurality of pixel units PX as a reference. It is said. The pixel portion PX at the driving end position of the display driving unit 24 has the largest voltage drop, and thus the deviation between the actual display gradation and the target gradation value is also maximized. Since the reference effective gradation value and the correction coefficient described in the second correction data table are based on the pixel portion PX that has the largest deviation from the target gradation value, the effective gradation value is determined with high accuracy. It can be corrected.

  The display driving unit 24 performs the light / dark separation process 34 after the first correction process 33. In this way, the first correction process 33 can be performed prior to the light / dark separation process 34.

  The television receiver 10TV according to the present embodiment includes the liquid crystal display device 10 described above. According to such a television receiver 10TV, since the display quality of the liquid crystal display device 10 is excellent, it is possible to realize display of a television image with excellent display quality.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the processing procedure by the display driving unit is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 10, the display drive unit (not shown) performs the light / dark separation process 134 before the digital unevenness correction process 130, that is, before the first correction process 133. Thereafter, the display driver sequentially performs the digital unevenness correction process 130, the digital gamma process 131, and the overshoot process 132, and then performs the first correction process 133, and then performs the second correction process 135 and the analog gamma process 136.

  As described above, according to the present embodiment, the display driving unit performs the light / dark separation process 134 before the first correction process 133. In this way, the first correction process 133 can be performed after the light / dark separation process 134 is performed.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the processing procedure by the display driving unit is changed from the first embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 11, the display drive unit (not shown) according to the present embodiment performs the light / dark separation process 234 after the overshoot process 232 and before the first correction process 233 and the second correction process 235. . Specifically, in the light / dark separation process 234, the display driving unit compares the gradation values of the nth and (n + 1) th pixel units (not shown) with reference to the storage unit (not shown). To calculate the difference. When the calculated difference is higher than a preset threshold value, the display driving unit does not perform the light / dark separation process 234 for each of the pixel units. In other words, the nth and (n + 1) th pixel portions whose gradation value difference exceeds the threshold value are not separated into a bright pixel portion and a dark pixel portion (not shown). On the other hand, when the calculated difference is lower than the threshold, the display driving unit performs the light / dark separation process 234 for each of the pixel units. In other words, the nth and (n + 1) th pixel portions whose gradation value difference exceeds the threshold value are separated into the bright pixel portion and the dark pixel portion, and the target gradation value is stored in the storage portion. After that, the display driving unit performs the first correction process 233 for the pixel part for which the light / dark separation process 234 is not performed, and performs the second correction process 235 for the pixel part for which the light / dark separation process 234 is performed. Specifically, the display drive unit performs the first correction on each pixel unit that has not been separated into the bright pixel unit and the dark pixel unit in the previous bright / dark separation process 234 among the nth and (n + 1) th pixel units. Processing 233 is performed to correct the gradation values and store the first corrected gradation value in the storage unit. Thereby, when a black or white character is included in the image, a large gradation difference generated between the character and the background of the intermediate gradation value can be corrected appropriately. On the other hand, the display drive unit performs the first operation on each pixel unit separated into the bright pixel unit and the dark pixel unit in the previous bright / dark separation process 234 among the nth and (n + 1) th pixel units. The correction process 233 is not performed. As a result, if the image includes a portion where no character exists (a portion of only the background), the first correction is performed on the background of the intermediate gradation value (the portion where the second correction processing 235 is performed). The processing 233 can be avoided.

  On the other hand, the display drive unit is not separated into the bright pixel portion and the dark pixel portion in the previous bright / dark separation processing 234 among the nth and (n + 1) th pixel portions, and the first correction processing 233 is performed. The second correction process 235 is not performed for the pixel portion. Accordingly, it is possible to avoid the second correction process 235 from being performed on a part including a character in the image (a part where the first correction process 233 is performed). On the other hand, the display drive unit is separated into a bright pixel unit and a dark pixel unit in the previous bright / dark separation process 234 among the nth and (n + 1) th pixel units, and the first correction process 233 is performed. For each pixel portion that is not displayed, the second correction processing 235 is performed, and the execution gradation value of the bright pixel portion or the dark pixel portion is stored in the storage portion based on the target gradation value of the bright pixel portion and the dark pixel portion. After the first correction process 233 and the second correction process 235, the display drive unit performs an analog gamma process 236.

  As described above, according to the present embodiment, the display driver compares the gradation values of the n-th and (n + 1) -th pixel units in the light / dark separation process 234, and if the difference is higher than the threshold value, the display driver n The nth and (n + 1) th pixel units are not separated into a bright pixel unit and a dark pixel unit, and when the difference is lower than the threshold, the nth and (n + 1) th pixel units are used as the bright pixel unit and the dark pixel unit. The target gradation values are separated and stored in the storage unit. In the first correction process 233, the nth and (n + 1) th pixel units that are not separated into the bright pixel unit and the dark pixel unit in the bright / dark separation process 234 are stored. While the gradation value is corrected and the first corrected gradation value is stored in the storage unit, in the second correction process 235, the target gradation value of the bright pixel portion and the dark pixel portion separated by the light / dark separation processing 234 is stored. The effective gradation value of the bright pixel part or dark pixel part is stored in the storage unit based on That. In this way, in the light / dark separation process 234 performed before the first correction process 233, the display driving unit compares the gradation values of the nth and (n + 1) th pixel units to calculate a difference. . When the calculated difference is higher than the threshold value, the light / dark separation process 234 is not performed on each of the nth and (n + 1) th pixel portions, and the light pixel portion and the dark pixel portion are not separated. On the other hand, when the calculated difference is lower than the threshold value, the light / dark separation process 234 is performed for each of the nth and (n + 1) th pixel portions, and the target gradation value is separated into the bright pixel portion and the dark pixel portion. Store in the storage unit. In the first correction processing 233, the first correction gradation value is obtained by correcting the gradation values of the nth and (n + 1) th pixel portions that are not separated into the bright pixel portion and the dark pixel portion in the light / dark separation processing 234. In contrast to the storage in the storage unit, in the second correction process 235, the execution gradation of the bright pixel part or the dark pixel part based on the target gradation value of the bright pixel part and the dark pixel part separated in the bright / dark separation process 234 The value is stored in the storage unit.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the processing procedure by the display driving unit is changed from the above-described third embodiment. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 12, the display driving unit (not shown) according to the present embodiment performs the light / dark separation process 334 before the digital unevenness correction process 330 as in the second embodiment. The light / dark separation process 334 is performed in the same manner as in the third embodiment. In other words, in the light / dark separation process 334, the display driving unit compares the gradation values of the nth and (n + 1) th pixel units (not shown) with reference to the storage unit (not shown), and calculates the difference. calculate. When the calculated difference is higher than a preset threshold value, the display driving unit does not perform the light / dark separation process 334 for each of the pixel units, but when the difference is lower than the threshold value, each of the pixel units As for, a light / dark separation process 334 is performed. After that, the display driving unit sequentially performs the digital unevenness correction process 330, the digital gamma process 331, and the overshoot process 332, and then performs the first correction process 333 on the pixel part on which the light / dark separation process 334 is not performed. A second correction process 335 is performed on each pixel portion for which the process 334 has been performed. The first correction process 333 and the second correction process 335 are the same as those in the third embodiment. Thereafter, the display drive unit performs analog gamma processing 336.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In addition to the above-described embodiments, specific numerical values of the reference execution gradation value described in the second correction data table, specific numerical values of the correction coefficient described in the third correction data table, and the like Can be changed as appropriate.
(2) In each of the above-described embodiments, a pixel in which the reference execution gradation value of the second correction data table and the correction coefficient of the third correction data table are in the tenth region (drive end position of the display drive unit). The reference execution gradation value of the second correction data table and the correction coefficient of the third correction data table are, for example, the first region (the drive start end position of the display drive unit). ) May be set on the basis of the pixel portion in (). In addition to this, a setting based on a pixel portion in any one of the second region to the ninth region may be employed.
(3) In each of the above-described embodiments, the case where the display surface is divided into 10 regions in the Y-axis direction and the correction coefficient is set in each region has been described. However, the specific number of divisions of the display surface and the correction coefficient The number of settings can be changed as appropriate other than ten.
(4) In each of the above-described embodiments, the case where the driver is COF-mounted on the flexible substrate has been shown. It does not matter.
(5) In addition to the above embodiments, the specific connection mode of the source wiring to the pixel electrode (pixel portion) in the liquid crystal panel can be changed as appropriate.
(6) In each of the embodiments described above, the display drive unit and the storage unit are both provided on the control board. However, any or all of these may be provided on a component other than the control board. Absent.
(7) In each of the above-described embodiments, the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction, but the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.
(8) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.
(9) In each of the above-described embodiments, the transmissive liquid crystal display device is exemplified. However, the present invention can be applied to a reflective liquid crystal display device and a transflective liquid crystal display device.
(10) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.
(11) In each of the above-described embodiments, the television receiver provided with the tuner has been exemplified. However, the present invention can also be applied to a display device that does not include the tuner. Specifically, the present invention can be applied to a liquid crystal display device used as an electronic signboard (digital signage) or an electronic blackboard.
(12) In the above-described first and second embodiments, the case where the first correction process and the second correction process are performed on all the pixel units has been described. It is also possible to perform the first correction process for the non-pixel portions but not the second correction process, and perform the second correction process for the pixel portions that perform the light and dark correction process but not to perform the first correction process. is there.
(13) In addition to the above-described embodiments, the timing for performing the light / dark separation process can be appropriately changed.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 10TV ... Television receiver, 11 ... Liquid crystal panel (display component), 11DS ... Display surface, 24 ... Display drive part, 25 ... Memory | storage part, 33, 133, 233, 333 ... 1st 1 correction processing, 34, 134, 234, 334... Bright and dark separation processing, 35, 135, 235, 335... Second correction processing, HPX... Bright pixel portion, LPX.

Claims (8)

A display component having a display surface in which a plurality of pixel portions are arranged in a matrix;
A display driver for sequentially driving the plurality of pixel units in the column direction;
Position information about the column direction in the plane of the display surface in the plurality of pixel units, and at least gradation values of the pixel units for which the driving order in the column direction is nth and (n + 1) th A storage unit for storing,
The display driver is
First correction obtained by correcting the gradation value of the (n + 1) th pixel unit by referring to the gradation value of each of the nth and (n + 1) th pixel units from the storage unit A first correction process for storing a gradation value in the storage unit;
The nth pixel unit and the (n + 1) th pixel unit are determined based on the gradation values of the nth and (n + 1) th pixel units from the storage unit. Bright / dark separation processing for storing the bright pixel portion obtained by separating the bright pixel portion having relatively high luminance and the dark pixel portion having relatively low luminance and the target gradation value of the dark pixel portion in the storage portion. When,
The target gradation values of the nth and (n + 1) th bright pixel portions and the dark pixel portion, and the (n + 1) th bright pixel portion or the dark pixel, which are performed after the light / dark separation process. The position information about the column direction in the display surface of the display unit is referred to from the storage unit, and the target gradation value of the (n + 1) th bright pixel unit or the dark pixel unit is obtained. A display device that performs at least a second correction process in which an effective gradation value of the (n + 1) -th bright pixel portion or dark pixel portion obtained by correction is stored in the storage portion. The storage unit includes the target gradation values of the nth and (n + 1) th bright pixel units and the dark pixel unit, and the execution in the (n + 1) th bright pixel unit or the dark pixel unit. It stores a correction data table that describes the relationship between the reference execution gradation value that is the reference of the gradation value,
In the second correction process, the display driving unit acquires the reference execution gradation value with reference to the correction data table stored in the storage unit, and the (n + 1) th bright pixel unit or the The display device according to claim 1, wherein the reference execution gradation value is corrected to the execution gradation value based on the position information in the column direction in a dark pixel portion. The storage unit stores a correction coefficient corresponding to a position in the column direction in the (n + 1) th bright pixel unit or the dark pixel unit,
In the second correction process, the display driving unit refers to the correction coefficient in the (n + 1) -th bright pixel unit or dark pixel unit from the storage unit, and the reference execution gradation value and the (n + 1) ) The second correction gradation value obtained by multiplying the difference from the target gradation value in the light pixel part or dark pixel part by the correction coefficient is the (n + 1) th light pixel part or The display device according to claim 2, wherein the effective gradation value is obtained by adding the target gradation value in a dark pixel portion.   The storage unit is based on the pixel unit in which the reference execution gradation value and the correction coefficient described in the correction data table are at the driving end position of the display driving unit among the plurality of pixel units. The display device according to claim 3.   The display device according to claim 1, wherein the display driving unit performs the light / dark separation process after the first correction process.   The display device according to claim 1, wherein the display driving unit performs the light / dark separation process before the first correction process.   The display driving unit compares the gradation values of the nth and (n + 1) th pixel units in the light / dark separation process, and if the difference is higher than a threshold, the nth and (n + 1) If the difference is lower than the threshold, the nth and (n + 1) th pixel units are not separated into the bright pixel unit and the bright pixel unit and the dark pixel unit. The target gradation value is separated into the dark pixel portion and stored in the storage portion, and the first correction process does not separate the light pixel portion and the dark pixel portion in the light pixel portion and the dark pixel portion in the light and dark separation processing. And the first correction gradation value is stored in the storage unit by correcting the gradation value of each of the (n + 1) th pixel units, whereas in the second correction process, the light / dark separation process is performed. Before the separated bright pixel portion and dark pixel portion The display device of claim 6, wherein the execution tone value of the bright pixel portion or the dark pixel portion is stored in the storage unit based on the object gray level value.   A television receiver comprising the display device according to any one of claims 1 to 7.

Images