JP2010066414A - Mark data for scrolling, computer-readable recording medium to which the data are recorded, and liquid crystal display - Google Patents

Abstract

An image blur of a mark image scroll-displayed in a liquid crystal display device can be prevented, and the display of the mark image can be clarified.
In a scroll mark data representing a shape and a gradation level of a mark image drawn while moving in a scroll direction F in a known display area with a gradation level of a background gb on a liquid crystal display screen, the mark In the image, the gradation levels of the edge portions ef and eb which are border portions in contact with the background in each of the scroll direction F and the opposite direction B are set different from the gradation levels of the other non-edge portions em. Yes. For example, the gradation levels of the edge portions ef and eb are set to a level at which a difference with respect to the gradation level of the background gb is larger than the gradation level of the non-edge portion em.
[Selection] Figure 2

Description

  The present invention relates to scroll mark data representing the shape and gradation level of a mark image drawn while moving in one scroll direction on a liquid crystal display screen, a computer-readable recording medium on which the mark data is recorded, and mark data. The present invention relates to a liquid crystal display device having a function of correcting for scrolling.

In a liquid crystal display device, a voltage (gray scale voltage) corresponding to the level of each of the R, G, and B3 primary colors in each frame of an image signal is applied to a liquid crystal element provided in the liquid crystal display panel. The image corresponding to the image signal is displayed on the liquid crystal display panel.
The liquid crystal element has a property that response speed is relatively slow, that is, a property that a change in filter characteristics is delayed with respect to a change in applied gradation voltage.
Therefore, as disclosed in Patent Documents 1 and 2, etc., the liquid crystal display device performs an acceleration driving process for correcting the gradation level of the input image according to the change and supplying the corrected image to the driving unit of the liquid crystal display panel. Often has a function to perform. This acceleration driving process overshoots the change in the gradation level of the signal supplied to the drive unit of the liquid crystal display panel with respect to the change in the gradation level from the previous frame to the current frame in the input image signal. It is a process to make. As a result, the gradation voltage supplied to the liquid crystal element overshoots, but the filter characteristics of the liquid crystal element change quickly to the target state without overshooting, and the responsiveness of the liquid crystal display panel to display moving images is improved. .
In addition, in the liquid crystal display device, a double-speed driving process is performed in which the driving cycle of the liquid crystal display panel (gradation voltage switching cycle with respect to the liquid crystal element) is set to twice the frame update cycle in the image signal to improve the response of moving image display. . In this double speed driving process, an intermediate image between a certain frame image and the next frame image in the display target image (moving image) is generated and inserted.

By the way, scroll images are often included in images to be displayed by a liquid crystal display device. A scroll image is an image in which a mark image, which is an image of characters, figures, etc., is drawn (scrolled) while being moved in one direction on the display screen. This scroll image is often seen in content images such as broadcast programs and movies. Hereinafter, the moving direction of the scroll image is referred to as the scroll direction.
In the double speed driving process, a mark image to be scrolled is extracted when the intermediate image is generated.
In the mark image extraction processing, the correlation degree of the partial images is calculated between a plurality of consecutive frame images. Further, when a partial image having a degree of correlation of a predetermined level or more moves at a constant speed among a plurality of continuous frame images, the partial image is extracted as a mark image that is scroll-displayed. In the intermediate image, the extracted mark image is arranged at a position intermediate between a display position in a certain frame image and a display position in the next frame image.

In addition, a video display device such as a liquid crystal display device has a function of scrolling and displaying a mark image (character or the like) corresponding to a character code specified separately on an image of content to be displayed. In this case, the video display device includes a nonvolatile memory such as a ROM in which a character code and mark data representing the shape and gradation level of the mark image are associated and stored in advance, and the mark image is based on the mark data. Specify the display form. The mark data is generally referred to as font data. Since the mark image may include images such as graphics other than characters (fonts), the term mark data is used as a term including the font data in this specification.
Note that Patent Document 3 discloses a technique for making a scroll image easier to see by inserting unlit blanks between individual characters in the scroll image.

JP 2000-231091 A JP 2003-207761 A JP 2006-276135 A

However, even if the liquid crystal display device has the function of performing the acceleration driving process and the double speed driving process, when the scroll display of the mark image is performed, the image blur of the moving mark image is likely to occur. There was a problem that it was easy to become unclear. This will be described below.
In general, scroll images are often scrolled and displayed in one of the following two display patterns. In other words, in the first display pattern, a mark image of black (minimum gradation level) or a gradation level close to black is scroll-displayed in an area where the background is white (maximum gradation level) or a gradation level close thereto. Pattern. The second display pattern is a pattern in which a mark image with a gradation level of white or close to it is scroll-displayed in a region where the background is black or has a gradation level close thereto.

FIG. 13 shows a state in which a mark image representing the character “B” is scroll-displayed in the first display pattern in a conventional liquid crystal display device. In FIG. 13, the left direction toward the paper surface is the scroll direction F (the moving direction of the mark image). Hereinafter, a direction opposite to the direction in which the mark image scrolls (moves) is referred to as an anti-scroll direction. In FIG. 13, the right direction is the anti-scroll direction B toward the page.
FIG. 14 shows a change in the gradation level Lv of the pixel when a part P0 of the mark image gf0 shown in FIG. 13 is displayed in a pixel (liquid crystal element) of the conventional liquid crystal display device.
When scroll display is performed in the first display pattern, as shown in FIG. 14, the gradation level of the pixel is determined from the drawing state of the mark image where the minimum gradation level or a gradation level close to the minimum gradation level continues. The drawing state of the background is switched to the maximum gradation level or a gradation level close to it at once. In this case, the liquid crystal element is continuously held in the filter state of the minimum gradation level during the display of the mark image, so that the delay time until switching from the state to the filter state of the maximum gradation level is increased. . As a result, as shown in FIG. 13, a black image remains at the end of the mark image gf0 in the anti-scroll direction B (the end opposite to the moving direction, the right end of the mark image gf0 in FIG. 13). Image blurring g1 is likely to occur. Similarly, at the end of the mark image gf0 in the scroll direction F (the end in the moving direction, the left end of the mark image gf0 in FIG. 13), a white image appears in the mark image gf0 due to the same phenomenon as described above. Is likely to cause image blur g2 in which is left. This image blur g2 is likely to occur when the interval between the plurality of mark images scroll-displayed is wide.
Also, when scroll display is performed with the second display pattern, image blur is likely to occur as in the case of scroll display with the first display pattern (FIGS. 13 and 14).

The above-described image blur phenomenon in the scroll image is not sufficiently eliminated even if the double speed driving process is performed.
Further, in the scroll display, the gradation level of the pixel is often switched at a stretch between the minimum gradation level and the maximum gradation level, so there is no room for correction to overshoot the gradation level. Accelerated drive processing does not work effectively.
Further, as shown in Patent Document 3, the image blur of the scroll image in the liquid crystal display device is not eliminated even if a blank portion is provided between the mark images.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to prevent image blurring of a mark image scroll-displayed in a liquid crystal display device and to clarify the display of the mark image. Another object of the present invention is to provide scroll mark data, a computer-readable recording medium on which the mark data is recorded, and a liquid crystal display device.

In order to achieve the above object, the present invention (including the first and second inventions described later) is stored in storage means such as a ROM in a liquid crystal display device, and the background gradation level in the liquid crystal display screen is known. This is an invention relating to scroll mark data representing the shape and gradation level of a mark image drawn while being moved in one scroll direction in the display area. The scroll mark data according to the present invention has the following characteristics.
In the mark image, the gradation level of the edge portion which is a boundary portion in contact with the background in each of the scroll direction and the opposite direction is different from the gradation level of the non-edge portion which is a portion other than the edge portion. Is set.
More specifically, the scroll mark data according to the first invention has the following characteristics (1-1).
(1-1) In the mark image, the gradation level of the edge portion is set to a level at which a difference with respect to the gradation level of the background is larger than the gradation level of the non-edge portion.
As a typical example of the scroll mark data having the feature (1-1), data shown in the following (1-2) or (1-3) can be considered.
(1-2) Whereas the gradation level of the background is the maximum gradation level, the gradation level of the edge portion is set to the minimum gradation level, and the gradation level of the non-edge portion is maximum. The scroll mark data set at an intermediate gradation level that is closer to the minimum gradation level than the gradation level.
(1-3) While the gradation level of the background is the minimum gradation level, the gradation level of the edge portion is set to the maximum gradation level, and the gradation level of the non-edge portion is minimum. The scroll mark data set to an intermediate gradation level that is closer to the maximum gradation level than the gradation level.
The data shown in (1-2) is mark data used when scroll display is performed in the first display pattern.
On the other hand, data shown in (1-3) is mark data used when scroll display is performed in the second display pattern.

The scroll mark data according to the second invention has the following feature (2-1).
(2-1) In the mark image, a gradation level of an edge portion which is a boundary portion in contact with the background in each of the scroll direction and the opposite direction, and a gradation level of a non-edge portion which is a portion other than the edge portion However, the magnitude relationship with respect to the gradation level of the background is set to an opposite level.
The scroll mark data according to the second invention is data used when the background gradation level of the scroll display area is an intermediate level between the minimum gradation level and the maximum gradation level. It is.
The edge portion in the mark image represented by the scroll mark data according to the second invention has a gradation level closer to the background gradation level than the gradation level of the non-edge portion, as will be described later. On the screen, it is a part recognized as a background part in contact with the edge of the mark image.

As an example of the scroll mark data having the feature (2-1), data shown in the following (2-2) or (2-3) can be considered.
(2-2) Whereas the gradation level of the background is the intermediate gradation level closer to the maximum gradation level than the minimum gradation level, the gradation level of the edge portion is the maximum. The scroll mark data set to the tone level and the tone level of the non-edge portion is set to the minimum tone level.
(2-3) Whereas the gradation level of the background is an intermediate gradation level closer to the minimum gradation level than the maximum gradation level, the gradation level of the edge portion is the minimum. The scroll mark data set to the tone level, and the tone level of the non-edge portion is set to the maximum tone level.
The data shown in (2-2) is data used when a mark image of black or a gradation level close thereto is scroll-displayed in an area where the background gradation level is relatively large (close to white). .
On the other hand, the data shown in (2-3) is data used when scrolling a white or close mark image of a gradation level in an area where the gradation level of the background is relatively small (close to black). It is.

In the liquid crystal display device, when scroll display is performed based on the above-described scroll mark data according to the present invention (the first invention or the second invention), the display of the mark image and the background will be described later. When the display is switched, the gradation voltage applied to the liquid crystal element changes more steeply as in the case where the acceleration driving process is performed. As a result, the responsiveness of the liquid crystal element when switching between the display of the mark image and the display of the background is improved, and the image blur of the mark image displayed in a scroll can be prevented.
The present invention can also be understood as a computer-readable recording medium on which the scroll mark data according to the first invention or the second invention described above is recorded. The scroll mark data recorded on such a recording medium is referred to by a microprocessor (an example of a computer) provided in the liquid crystal display device, and scroll display processing is executed by the microprocessor.

Further, the present invention corrects reference mark data (conventional mark data) in which a constant gradation level is set, and generates scroll mark data according to the first invention or the second invention. The invention can also be understood as an invention relating to a liquid crystal display device that performs scroll display based on the generated data.
That is, the liquid crystal display device according to the present invention moves the mark image in one scroll direction in a display area where the background gradation level is known on the liquid crystal display screen based on the mark data indicating the shape and gradation level of the mark image. It is an apparatus which draws while moving to.
And the liquid crystal display device which concerns on 1st invention is provided with each component shown by following (D1-1) and (D1-2).
(D1-1) An edge portion that is a boundary portion in contact with the background in the scroll direction and the opposite direction in the mark image represented by the reference mark data with respect to the reference mark data for which a certain gradation level is set Mark data correction means for correcting the gradation level so that the difference between the gradation level of the background and the gradation level of the background is larger than the gradation level of the non-edge portion, which is a portion other than the edge portion.
(D1-2) Scroll drawing means for drawing on the liquid crystal display screen while moving the mark image based on the corrected mark data obtained by the mark data correction means in the scroll direction.
The liquid crystal device according to the first aspect of the present invention has the same effects as when scroll display is performed using the scroll mark data according to the first aspect of the present invention.

The liquid crystal display device according to the second aspect of the present invention includes the components shown in the following (D2-1) and (D2-2).
(D2-1) An edge portion which is a boundary portion in contact with the background in each of the scroll direction and the opposite direction in the mark image represented by the reference mark data with respect to the reference mark data in which a certain gradation level is set Mark data for correcting the gradation level so that the gradation level of the non-edge portion, which is a portion other than the edge portion, is opposite to the background gradation level. Correction means.
(D2-2) Scroll drawing means for drawing on the liquid crystal display screen while moving the mark image based on the corrected mark data obtained by the mark data correction means in the scroll direction.
The liquid crystal device according to the second aspect of the present invention has the same effects as when scroll display is performed using the scroll mark data according to the second aspect of the present invention.

  According to the present invention, it is possible to prevent occurrence of image blur of a mark image scroll-displayed in a liquid crystal display device, and to clarify the display of the mark image.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal television receiver X which is an example of a liquid crystal display device that performs scroll display processing based on scroll mark data according to the present invention. FIG. FIG. 3 shows a mark image represented by scroll mark data (character example) according to the first embodiment, and FIG. 3 shows a mark image represented by scroll mark data (graphic example) according to the first embodiment of the first invention. FIG. 4 is a diagram of a mark image represented by scroll mark data according to the second embodiment of the first invention. FIG. 5 is a diagram of a mark image representing scroll mark data according to the first embodiment of the second invention. FIG. 6 is a view of a mark image representing scroll mark data according to the second embodiment of the second invention, and FIG. 7 is a grayscale level in scroll display based on the scroll mark data according to the first embodiment of the first invention. FIG. 8 is a graph showing the relationship between the change in gradation level and the change in gradation voltage, and FIG. 9 is the scroll mark data according to the first embodiment of the first invention. FIG. 10 is a diagram showing a second specific example of gradation level change in scroll display based on FIG. 10, and FIG. 10 shows a specific example of gradation level change in scroll display based on scroll mark data according to the second embodiment of the first invention. FIG. 11 is a diagram showing a specific example of gradation level change in scroll display based on scroll mark data according to the first embodiment of the second invention. FIG. 12 is a diagram for scrolling according to the second embodiment of the second invention. FIG. 13 is a diagram showing a specific example of gradation level change in scroll display based on mark data, FIG. 13 is a diagram showing how a mark image is scroll-displayed in a conventional liquid crystal display device, and FIG. It is a graph showing a change in gradation level when the mark image in a pixel of the liquid crystal display device (liquid crystal device) of is displayed.

First, the configuration of a liquid crystal television receiver X which is an example of a liquid crystal display device that performs scroll display processing based on scroll mark data according to the present invention will be described with reference to the block diagram shown in FIG.
As shown in FIG. 1, a television receiver X includes a tuner 1, an external signal input unit 2, a demodulation / separation circuit 3, a video decoding circuit 11, a video selection circuit 12, a video processing circuit 13, a liquid crystal driver 14, and a liquid crystal. Display panel 15, dimming circuit 16, backlight 17, audio decoding circuit 21, audio selection circuit 22, audio processing circuit 23, amplifier 24, speaker 25, control circuit 4, mark data ROM 5, remote control light receiving unit 6, remote control 7, etc. It has.

The tuner 1 is an electronic component that extracts a signal of content (broadcast program) being broadcast from an input television broadcast signal. More specifically, the tuner 1 extracts a carrier frequency component signal including a broadcast program signal instructed to be selected by the control circuit 4, and transmits the extracted signal to the demodulation / separation circuit 3 in the subsequent stage. To do. The tuner 1 is provided for each broadcasting medium (terrestrial wave, BS, CS, etc.).
The demodulation / separation circuit 3 demodulates a transport stream signal (Transport Stream signal: hereinafter referred to as a TS signal) from the carrier frequency component transmitted from the tuner 1. Further, the demodulation / separation circuit 3 separates and extracts a video signal and an audio signal corresponding to a broadcast program to be viewed and additional data from the extracted TS signal. Further, the demodulation / separation circuit 3 extracts a video signal and an audio signal of a broadcast program to be viewed according to a PID (Packet IDentification) received from the control circuit 4, and each signal is extracted from the video decoding circuit 11 And to each of the speech decoding circuits 21.
Further, the demodulation / separation circuit 3 extracts SI (Service Information) as additional data from the TS signal and transmits it to the control circuit 4. The SI is data in which information of an EPG (electronic program guide) (for example, information indicating a program name, a program genre, a broadcast time, etc.) is multiplexed.

The external signal input unit 2 is a signal input interface for inputting a video signal and an audio signal from an external device.
The video decoding circuit 11 decodes the video signal transmitted from the demodulation / separation circuit 3 and transmits the decoded video signal to the video selection circuit 12. Similarly, the audio decoding circuit 21 decodes the audio signal transmitted from the demodulation / separation circuit 3 and transmits the decoded audio signal to the audio selection circuit 22.
The video selection circuit 12 selects one or a plurality of video signals from a plurality of video signals input according to a control command from the control circuit 4 and transmits the selected video signals to the video processing circuit 13. The signals input to the video selection circuit 12 include the video signal of the content of the broadcast program input through the video decoding circuit 11 and the video signal of the external input content input through the external signal input unit 2. It is.

The video processing circuit 13 generates a frame image signal to be supplied to the liquid crystal driver 14 in order to display a content image on the liquid crystal display panel 15 in accordance with a control command from the control circuit 4. This frame image signal is a signal in which the gradation level is set for each pixel (for each liquid crystal element).
For example, the video processing circuit 13 generates a frame image signal that causes the liquid crystal display panel 15 to display an image in which a scroll image is superimposed on an image of content input through the video selection circuit 12.
Specifically, the video processing circuit 13 acquires a character code for identifying a mark such as a character string or a figure to be scrolled from the control circuit 4, and scroll mark data corresponding to the character code. Are read from the mark data ROM 5.
In the mark data ROM 5, a plurality of mark data representing the shape and gradation level of a mark image, which is an image such as a character or a figure, is stored in association with a character code for identifying each of the mark data. Are read out by a microprocessor included in the video processing circuit 13. The mark data stored in the mark data ROM 5 is mark data specialized for scrolling in the liquid crystal display device, and is hereinafter referred to as scrolling mark data. Details thereof will be described later. The mark data ROM 5 is an example of a recording medium that can be read by a microprocessor (an example of a computer) included in the video processing circuit 13.
The video processing circuit 13 is a frame image of an image in which a mark image based on the scroll mark data read from the mark data ROM 5 is superimposed on a part of the content image input through the video selection circuit 12. Generate a signal. The superimposition of the image signals (image data) is performed in the frame memory 13a provided in the video processing circuit 13. At that time, the video processing circuit 13 shifts the mark image overlapping position in the content image by a predetermined distance in the scroll direction designated by the control circuit 4 for each frame. As a result, an image of the content including the scroll image is displayed on the liquid crystal display panel 15.
As described above, the video processing circuit 13 generates a mark image, which is an image such as a character or a figure, in the display area where the background gradation level is known on the screen of the liquid crystal display panel 15 based on the scroll mark data. Scroll display processing is performed for drawing while moving in one scroll direction.
The character code transmitted from the control circuit 4 to the video processing circuit 13 is, for example, a code representing service information extracted from a broadcast signal by the tuner 1 and the demodulation / separation circuit 3.

The video processing circuit 13 corrects the gradation signal in the image signal of the input content according to the change, and supplies the frame image signal including the corrected gradation signal to the liquid crystal driver 14. Perform acceleration drive processing.
Specifically, the video processing circuit 13 temporarily stores the image signal of the latest frame and the image signal of the previous (previous) frame in the frame memory 13a. Then, the video processing circuit 13 refers to the signal stored in the frame memory 13a, and responds to the liquid crystal driver 14 with respect to the level change of the gradation signal from the previous (previous) frame to the current frame. Correction to overshoot the level change of the supplied gradation signal is performed.

The liquid crystal driver 14 controls the liquid crystal display panel 15 based on the frame image signal sequentially transmitted from the video processing circuit 13 in a predetermined cycle, and corresponds to one frame (one frame) corresponding to the frame image signal. Are sequentially displayed on the liquid crystal display panel 15. Specifically, the liquid crystal driver 14 applies a gradation voltage corresponding to a gradation level set for each pixel in the frame image signal to each liquid crystal element for each pixel provided in the liquid crystal display panel 15. Apply.
The liquid crystal display panel 15 displays an image corresponding to the frame image signal in accordance with control by the liquid crystal driver 14.
The backlight 17 illuminates the display area of the liquid crystal display panel 15 from the back side with the light of a plurality of light sources arranged on the back side of the liquid crystal display panel 15.
The dimming circuit 16 adjusts the power supplied to the light source of the backlight 17 in accordance with a control command from the control circuit 4, thereby adjusting the brightness of the light emission of the backlight 17 by PWM control. Circuit.

The voice decoding circuit 21 decodes the voice signal transmitted from the demodulation / separation circuit 3 and transmits the decoded voice signal to the voice selection circuit 22.
The audio selection circuit 22 is a circuit that selects one audio signal from a plurality of input audio signals in accordance with a control command from the control circuit 4 and transmits the selected audio signal to the audio processing circuit 23. The audio signal input to the audio selection circuit 22 includes an audio signal of the content of the broadcast program selected by the tuner 1 (an audio signal input through the audio decoding circuit 21), and the external signal input unit 2 And an audio signal input through.
The voice processing circuit 23 performs various signal processing on the voice signal selected by the voice selection circuit 22 in accordance with an instruction from the control circuit 4. For example, equalization processing, surround processing, or the like according to the characteristics of the speaker 25 is performed.
The amplifier 24 performs a volume adjustment process for amplifying or attenuating the audio signal processed by the audio processing circuit 23 in accordance with an instruction from the control circuit 4, and outputs it to the speaker 25.

  The remote control light receiving unit 6 is a signal transmission interface for receiving a radio signal by infrared rays from a remote control 7 (remote operation unit) for operating the television receiver X according to a predetermined signal transmission protocol (so-called remote control protocol). . Then, the remote control light receiving unit 6 extracts a signal representing operation input information for the remote control 7 from the infrared signal and transmits the signal to the control circuit 4.

The control circuit 4 includes an MPU 4a that is a calculation means, and a ROM 4b (EPROM) and an EEPROM 4c that are storage means, and the MPU 4a controls the entire television receiver X by executing a control program.
The ROM 4b stores in advance a control program executed by the MPU 4a. The EEPROM 4c stores various data that is read and written (referenced or written) in the process executed by the MPU 4a.
In the following description, the processing executed by the control circuit 4 is realized by the MPU 4a executing a control program stored in the ROM 4b.
For example, the control circuit 4 acquires channel tuning and volume control information through the remote controller 7 and the remote control light receiving unit 6, and selects a tuning instruction for the tuner 1 and the amplifier 24 according to the contents of the acquired information. Outputs volume adjustment instructions.
In addition, when the control circuit 4 acquires information requesting scroll display of service information through the remote controller 7 and the remote control light receiving unit 6, the control circuit 4 performs a character corresponding to SI (Service Information) acquired from the demodulation / separation circuit 3. The code and a scroll display execution command are sent to the video processing circuit 13. In response to this, scroll display processing by the video processing circuit 13 is executed.

Next, the scroll mark data stored in advance in the mark data ROM 5 will be described with reference to FIGS.
The scroll mark data is data representing the shape and gradation level of a mark image drawn while being moved in one scroll direction F in a display area where the background gradation level on the screen of the liquid crystal display panel 15 is known. It is. The mark data ROM 5 stores a plurality of scroll mark data representing a plurality of types of mark images.
For example, the scroll mark data is bitmap data in which a gradation level is set for a pixel at the position of a drawing point forming a mark image among a plurality of pixels arranged in two dimensions. . In this case, a value other than a value that can be taken as a gradation level is set for the pixels in the background portion other than the drawing point, for example. In addition, the scroll mark data may be vector data called an outline font.

2 to 6 show examples of mark images represented by the scroll mark data f1 ′ and f1 to f4 according to the embodiment of the present invention.
2 to 6, the degree of shading of the drawing part and the background part is the degree of shading corresponding to the gradation level of each part. That is, the portion having the minimum gradation level is displayed in black, the portion having the maximum gradation level in white, and the portion in the middle gradation level in gray.
A feature common to the scroll mark data f1 ′, f1 to f4 (see FIGS. 2 to 6) is that the mark image has a gradation level of the front edge portion ef which is a boundary portion in contact with the background gb in the scroll direction F. , In the anti-scroll direction B, the gradation level of the rear edge portion eb which is a boundary portion in contact with the background gb is set to a level different from the gradation level of the non-edge portion em which is the other portion. .
Hereinafter, characteristics of the scroll mark data f1 ′ and f1 to f4 will be described.

FIG. 2 is a diagram of a mark image represented by scroll mark data f1 ′ (hereinafter abbreviated as mark data f1 ′) according to the first embodiment of the first invention. The mark image shown in FIG. 2 is an image representing the character “mouth”.
The mark data f1 ′ is data of a mark image that is scroll-displayed in a display area where the gradation level of the background gb on the display screen of the liquid crystal display panel 15 is the maximum gradation level Lmax.
The mark data f1 ′ is characterized in that the gradation level of the front edge portion ef and the rear edge portion eb is set to the minimum gradation level Lmin, and the gradation level of the non-edge portion em is the maximum. The point is that the gradation level is set to an intermediate gradation level Lm1 closer to the minimum gradation level than the gradation level Lmax (= the gradation level of the background gb).
For example, when the minimum gradation level Lmin is 0 and the maximum gradation level Lmax is 255 (= the gradation level of the background gb), the gradation levels of the front edge portion ef and the rear edge portion eb are 0. In addition, the gradation level Lm1 of the non-edge portion em is set to a value in the range of 1 to 122 (for example, about 20).

FIG. 7 is a diagram showing a specific example of a change in gradation level of a certain pixel when the mark image of the mark data f1 ′ shown in FIG. 2 is scroll-displayed. FIG. 7 shows a change in the gradation level Lv of the pixel displaying the P1 portion of the mark image shown in FIG.
As shown in FIG. 7, in the scroll display based on the mark data f1 ′, when the state of displaying the non-edge portion em of the mark image is switched to the state of displaying the background gb, the rear edge portion eb Due to the presence, the gradation level Lv of the pixel is changed from the gradation level Lm1 of the non-edge portion em to a direction opposite to the direction toward the gradation level of the background gb, and then to the gradation level of the background gb. Be changed. As a result, the change in gradation voltage at the time of switching the display from the mark image to the background becomes steeper and the responsiveness of the liquid crystal element is increased, thereby preventing the image blur of the mark image being scroll-displayed.
FIG. 8 is a graph showing the relationship between the change in the gradation level Lv of the pixel and the change in the gradation voltage Vr (voltage applied to the liquid crystal element). As shown in FIG. 8, the gradation voltage Vr shows a change that follows the change in the gradation level Lv. That is, the gradation level Lv and the gradation voltage Vr are approximately equivalent.

FIG. 9 is also a diagram showing a specific example of a change in gradation level of a certain pixel when the mark image of the mark data f1 ′ shown in FIG. However, FIG. 9 shows a change in the gradation level Lv of the pixel displaying the P2 portion of the mark image shown in FIG.
As shown in FIG. 9, in the scroll display based on the mark data f1 ′, when switching from the state of displaying the background gb to the state of displaying the mark image, the presence of the front edge portion ef causes the pixel level. After the tone level Lv is changed from the maximum tone level Lmax to the minimum tone level Lmin, the tone level Lv is changed to the tone level Lm1 of the non-edge portion em. As a result, even when the display is switched from the background to the mark image, the change in the gradation voltage becomes steeper and the responsiveness of the liquid crystal element is increased, thereby preventing the blurred image of the mark image being scroll-displayed.
3 is an example of the mark image represented by the mark data f1 according to the first embodiment of the first invention, similar to the mark data f1 ′ of FIG. 2, but the mark image shown in FIG. 3 is not a character. It is an image showing a symbol.
The mark data f1 shown in FIG. 3 is data having the same content as the mark data f1 ′ shown in FIG. 2 except that the shape of the mark image is different. The mark data f1 representing the mark image as shown in FIG. 3 is also an example of the scroll mark data according to the first invention.

FIG. 4 is a view of an image represented by scroll mark data f2 (hereinafter abbreviated as mark data f2) according to the second embodiment of the first invention.
The mark data f2 is data of a mark image that is scroll-displayed in a display area where the gradation level of the background gb on the display screen of the liquid crystal display panel 15 is the minimum gradation level Lmin (black).
The mark data f2 is characterized in that the gradation level of the front edge portion ef and the rear edge portion eb is set to the maximum gradation level Lmax, and the gradation level of the non-edge portion em is the minimum level. The intermediate gradation level Lm2 is set closer to the maximum gradation level Lmax than the gradation level Lmax (= the gradation level of the background gb).
For example, when the minimum gradation level Lmin is 0 and the maximum gradation level Lmax is 255 (= the gradation level of the background gb), the gradation levels of the front edge portion ef and the rear edge portion eb are 255. Further, the gradation level Lm2 of the non-edge portion em is set to a value in the range of 123 to 254 (for example, about 235).
In FIG. 4, for the sake of convenience, the background gb portion is shown with shades corresponding to the gradation level. This is because the gradation level information of the background gb is included in the mark data f2. It does not mean to be included.

FIG. 10 is a diagram showing a specific example of a change in gradation level of a certain pixel when the mark image of the mark data f2 shown in FIG. 4 is scroll-displayed. FIG. 10 shows a change in the gradation level Lv of the pixel displaying the P3 portion of the mark image shown in FIG.
As shown in FIG. 10, in the scroll display based on the mark data f2, the presence of the rear edge portion eb when the non-edge portion em of the mark image is switched to the state of displaying the background gb. As a result, the gradation level Lv of the pixel is changed from the gradation level Lm2 of the non-edge portion em to the direction opposite to the direction toward the gradation level of the background gb, and then changed to the gradation level of the background gb. Is done.
Further, when switching from the state of displaying the background gb to the state of displaying the mark image, due to the presence of the front edge portion ef, the gradation level Lv of the pixel is changed from the minimum gradation level Lmin to the maximum gradation level. After changing to Lmax, the gradation level Lm2 of the non-edge portion em is changed.
As a result, the change in the gradation voltage at the time of switching the display between the mark image and the background becomes steeper, and the response of the liquid crystal element is increased, thereby preventing the image blur of the mark image being scroll-displayed.

By the way, the mark data f1 ′, f1 (first embodiment) and the mark data f2 (second embodiment) are edges which are boundary portions in contact with the background in the scroll direction F and the opposite direction B in the mark image. The gradation levels of the parts ef and eb are common in that the difference between the gradation level of the background gb is larger than the gradation levels L1 and L2 of the non-edge part em.
When scroll display is performed based on the scroll mark data for which the gradation level is set in this way, the change in the gradation voltage when the display is switched between the mark image and the background becomes steeper. The responsiveness of the element is enhanced, and the image blur of the mark image displayed in a scroll can be prevented.

FIG. 5 is a diagram of a mark image represented by scroll mark data f3 (hereinafter abbreviated as mark data f3) according to the first embodiment of the second invention. The mark image shown in FIG. 5 is an image representing the character “mouth”.
The mark data f3 is a display in which the gradation level of the background gb on the display screen of the liquid crystal display panel 15 is an intermediate gradation level Lm3 closer to the maximum gradation level Lmax than the minimum gradation level Lmin. This is the mark image data scroll-displayed in the area.
The mark data f3 is characterized in that the gradation levels of the front edge portion ef and the rear edge portion eb are set to the maximum gradation level Lmax, and the gradation level of the non-edge portion em is the minimum level. The adjustment level is set to Lmin.
For example, when the minimum gradation level Lmin is 0, the maximum gradation level Lmax is 255, and the gradation level of the background gb is 123 to 254 (for example, about 135), the front edge portion ef and the The gradation level of the rear edge portion eb is set to 255, and the gradation level of the non-edge portion em is set to 0.
In FIG. 5, for the sake of convenience, the background gb portion is shown with shades corresponding to the gradation level. This is because the gradation level information of the background gb is included in the mark data f3. It does not mean to be included.

FIG. 11 is a diagram showing a specific example of a change in gradation level of a certain pixel when the mark image of the mark data f3 shown in FIG. 5 is scroll-displayed. FIG. 11 shows a change in the gradation level Lv of the pixel displaying the P4 portion of the mark image shown in FIG.
As shown in FIG. 11, in the scroll display based on the mark data f3, the presence of the rear edge portion eb is present when the state of displaying the non-edge portion em of the mark image is switched to the state of displaying the background gb. Thus, after the gradation level Lv of the pixel is changed from the gradation level Lmin of the non-edge portion em to the level Lmax that overshoots the gradation level Lm3 of the background gb, the gradation level Lm3 of the background gb Returned to
Further, when switching from the state of displaying the background gb to the state of displaying the mark image, due to the presence of the front edge portion ef, the gradation level Lv of the pixel becomes the maximum gradation from the gradation level Lm3 of the background gb. After changing to the level Lmax, the gradation level Lmin of the non-edge portion em is changed.
As a result, the change in the gradation voltage at the time of switching the display between the mark image and the background becomes steeper, and the response of the liquid crystal element is increased, thereby preventing the image blur of the mark image being scroll-displayed.
Note that the gradation level of the front edge portion ef and the rear edge portion eb in the mark image represented by the mark data f3 is closer to the gradation level of the background gb than the gradation level of the non-edge portion em. Accordingly, the edge portions ef and eb are recognized as background portions in contact with the edge portion of the mark image on the screen.

FIG. 6 is a view of a mark image represented by scroll mark data f4 (hereinafter abbreviated as mark data f4) according to the second embodiment of the second invention. The mark image shown in FIG. 6 is an image representing the character “mouth”.
The mark data f4 is a display in which the gradation level of the background gb on the display screen of the liquid crystal display panel 15 is an intermediate gradation level Lm4 closer to the minimum gradation level Lmin than the maximum gradation level Lmax. This is the mark image data scroll-displayed in the area.
The mark data f4 is characterized in that the gradation level of the front edge portion ef and the rear edge portion eb is set to the minimum gradation level Lmin, and the gradation level of the non-edge portion em is the maximum gradation level. The level Lmax is set.
For example, when the minimum gradation level Lmin is 0, the maximum gradation level Lmax is 255, and the gradation level of the background gb is 1 to 122 (for example, about 20), the front edge portion ef and the The gradation level of the rear edge portion eb is set to 0, and the gradation level of the non-edge portion em is set to 255.
In FIG. 6, for the sake of convenience, the background gb portion is shown with shades corresponding to the gradation level. This is because the gradation level information of the background gb is included in the mark data f4. It does not mean to be included.

FIG. 12 is a diagram showing a specific example of a change in gradation level of a certain pixel when the mark image of the mark data f4 shown in FIG. 6 is scroll-displayed. FIG. 12 shows a change in the gradation level Lv of the pixel displaying the P5 portion of the mark image shown in FIG.
As shown in FIG. 12, in the scroll display based on the mark data f4, when the non-edge portion em of the mark image is switched from the state displaying the background gb, the existence of the rear edge portion eb is present. Thus, after the gradation level Lv of the pixel is changed from the gradation level Lmax of the non-edge portion em to the level Lmin overshooting the gradation level Lm4 of the background gb, the gradation level Lm4 of the background gb Returned to
Further, when switching from the state of displaying the background gb to the state of displaying the mark image, the gradation level Lv of the pixel is changed from the gradation level Lm4 of the background gb to the minimum gradation due to the presence of the front edge portion ef. After changing to the level Lmin, the gradation level Lmax of the non-edge portion em is changed.
As a result, the change in the gradation voltage at the time of switching the display between the mark image and the background becomes steeper, and the response of the liquid crystal element is increased, thereby preventing the image blur of the mark image being scroll-displayed.
Note that the gradation level of the front edge portion ef and the rear edge portion eb in the mark image represented by the mark data f4 is closer to the gradation level of the background gb than the gradation level of the non-edge portion em. Accordingly, the edge portions ef and eb are recognized as background portions in contact with the edge portion of the mark image on the screen.

By the way, the mark data f3, f4 includes the gradation levels of the edge portions ef, eb which are border portions in contact with the background in the scroll direction F and the opposite direction B in the mark image, and the other non-edge portions em. Are common in that the magnitude relationship with respect to the gradation level of the background gb is set to the opposite level.
When scroll display is performed based on the scroll mark data for which the gradation level is set in this way, the change in the gradation voltage when the display is switched between the mark image and the background becomes steeper. The responsiveness of the element is enhanced, and the image blur of the mark image displayed in a scroll can be prevented.
Also, the mark data f1, f1 ′, f2 to f4 shown in FIGS. 2 to 6 have exactly the same effects even if the relationship between the scroll direction F and the anti-scroll direction B is opposite.

  Each of the scroll mark data f1, f1 ', f2 to f4 described above is an example of data that does not include background gradation level information. However, it is also conceivable that the scroll mark data f1, f1 ', f2 to f4 include information on the gradation level of the background gb that satisfies the relative relationship with the gradation level of the mark image shown above.

Further, the embodiment described above is an example in which a mark image based on the scroll mark data recorded in advance in the mark data ROM 5 is scroll-displayed.
However, the liquid crystal display device X corrects the conventional mark data (hereinafter referred to as reference mark data) in which a constant gradation level is set, thereby enabling the scrolling as shown in FIGS. It is also conceivable to generate mark data and perform scroll display processing based on the generated data. The fixed gradation level here does not include the background gradation level.

For example, the gradation level of the reference mark data recorded in the mark data ROM 5 is constant at the minimum gradation level Lmin, and the gradation level of the background gb in the display area is the maximum gradation level Lmax. Can be considered.
In this case, the video processing circuit 13 maintains the tone levels Lmin of the front edge portion ef and the rear edge portion eb in the reference mark data as they are, and sets the tone levels of the other non-edge portions em as follows. It is conceivable to correct from the minimum gradation level Lmin to the intermediate gradation level Lm1 (see FIGS. 7 and 9).
Similarly, the gradation level of the reference mark data recorded in the mark data ROM 5 is constant at the maximum gradation level Lmax, and the gradation level of the background gb in the display area is the minimum gradation level Lmix. There are cases.
In this case, the video processing circuit 13 maintains the gradation levels of the front edge portion ef and the rear edge portion eb in the reference mark data as they are, and sets the gradation levels of the other non-edge portions em to the maximum. It can be considered that the gradation level Lmax is corrected to the intermediate gradation level Lm2 (see FIG. 10).
The processing of the video processing circuit 13 described above is such that the gradation levels of the front edge portion ef and the rear edge portion eb in the mark image represented by the reference mark data are relative to the reference mark data. This is a process (an example of a mark data correction process) for correcting the gradation level so that the difference between the gradation level of the background gb and the gradation level of the non-edge portion em becomes larger.

Further, the gradation level of the reference mark data recorded in the mark data ROM 5 is constant at the minimum gradation level Lmin, and the gradation level of the background gb in the display area is larger than the minimum gradation level Lmin. It is conceivable that the gradation level is an intermediate gradation level (corresponding to Lm3 in FIG. 11) closer to the gradation level Lmax.
In this case, the video processing circuit 13 maintains the gradation level of the non-edge portion em in the reference mark data as it is, and sets the gradation levels of the front edge portion ef and the rear edge portion eb to the maximum gradation level. It is conceivable to correct the level Lmax.
By the way, as described above, both edge portions ef and eb in this case are portions recognized as background portions in contact with the edge portion of the mark image on the screen. Therefore, in this case, both edge portions ef and eb are subjected to expansion processing (processing for expanding the contour of the mark image) on the standard mark data, and both edge portions ef and eb are applied to the mark data after expansion processing. And the non-edge portion em are desirably divided.

Further, the gradation level of the reference mark data recorded in the mark data ROM 5 is constant at the maximum gradation level Lmax, and the gradation level of the background gb in the display area is minimum than the maximum gradation level Lmax. It is conceivable that the gradation level is an intermediate gradation level (corresponding to Lm4 in FIG. 12) closer to the gradation level Lmin.
In this case, the video processing circuit 13 maintains the gradation level of the non-edge portion em in the reference mark data as it is, and sets the gradation levels of the front edge portion ef and the rear edge portion eb to the minimum gradation level. It is conceivable to correct the level Lmin.
Also in this case, as described above, both edge portions ef and eb are recognized as background portions in contact with the edge portion of the mark image on the screen. For this reason, both edge portions ef and eb in this case are also subjected to expansion processing (processing for expanding the contour of the mark image) on the standard mark data, and both edge portions ef and eb are applied to the mark data after expansion processing. And the non-edge portion em are desirably divided.
The processing of the video processing circuit 13 described above is performed on the reference mark data with respect to the gradation levels of the two edge portions ef and eb and the level of the non-edge portion em in the mark image represented by the reference mark data. The tone level is a process (an example of a mark data correction process) in which the tone level is corrected so that the magnitude relationship with respect to the tone level of the background gb is opposite.
Then, the video processing circuit 13 performs scroll display processing (scroll drawing processing) based on the corrected mark data. As a result, a scroll image in which image blur is unlikely to occur is displayed on the screen of the liquid crystal display panel 15.

In addition to the case where the standard data is data recorded in advance on an information recording medium such as a ROM, the standard data is obtained by extracting a mark image scrolled from the content image to be displayed. The mark image data may be used.
In the mark image extraction processing, for example, the correlation degree of the partial images is calculated between a plurality of consecutive frame images. Further, when a partial image having a degree of correlation of a predetermined level or more moves at a constant speed among a plurality of continuous frame images, the partial image is extracted as a mark image that is scroll-displayed. Such mark image extraction processing is processing performed when the intermediate image frame signal is automatically generated in the double speed driving processing.

  The present invention can be applied to a liquid crystal display device having a scroll display function.

1 is a block diagram illustrating a schematic configuration of a liquid crystal television receiver X that is an example of a liquid crystal display device that performs scroll display processing based on scroll mark data according to the present invention. The figure of the mark image which scroll mark data (example of a character) concerning the 1st example of the 1st invention expresses. The figure of the mark image which the scroll mark data (example of figure) which concerns on 1st Example of 1st invention represents. The figure of the mark image which the mark data for scroll concerning the 2nd example of the 1st invention expresses. The figure of the mark image showing the mark data for scrolling concerning 1st Example of the 2nd invention. The figure of the mark image showing the mark data for scrolling concerning 2nd Example of the 2nd invention. The figure showing the 1st specific example of the gradation level change in the scroll display based on the scroll mark data based on 1st Example of 1st invention. The graph showing the relationship between the change of a gradation level and the change of a gradation voltage. The figure showing the 2nd specific example of the gradation level change in the scroll display based on the scroll mark data based on 1st Example of 1st invention. The figure showing the specific example of the gradation level change in the scroll display based on the mark data for scroll based on 2nd Example of 1st invention. The figure showing the specific example of the gradation level change in the scroll display based on the scroll mark data which concerns on 1st Example of 2nd invention. The figure showing the specific example of the gradation level change in the scroll display based on the scroll mark data concerning 2nd Example of 2nd invention. The figure showing a mode that a mark image is scroll-displayed in the conventional liquid crystal display device. The figure showing the change of the gradation level when the mark image in a certain pixel (liquid crystal element) of the conventional liquid crystal display device is displayed.

Explanation of symbols

X: Liquid crystal television receiver (liquid crystal display device)
1: Tuner 2: External signal input unit 3: Demodulation / separation circuit 4: Control circuit 5: Mark data ROM
6: Remote control light receiving unit 7: Remote control 11: Video decoding circuit 12: Video selection circuit 13: Video processing circuit 14: Liquid crystal driver 15: Liquid crystal display panel 16: Light control circuit (inverter circuit)
17: Backlight 21: Audio decoding circuit 22: Audio selection circuit 23: Audio processing circuit 24: Amplifier 25: Speaker

Claims (10)

Scroll mark data stored in storage means in a liquid crystal display device and representing the shape and gradation level of a mark image drawn while the background gradation level on the liquid crystal display screen is moved in one scroll direction in a known display area Because
In the mark image, the gradation level of the edge portion that is a boundary portion in contact with the background in each of the scroll direction and the opposite direction is set different from the gradation level of the non-edge portion that is a portion other than the edge portion. Scroll mark data characterized by being made.   2. The scroll image according to claim 1, wherein the gradation level of the edge portion in the mark image is set to a level at which a difference from the gradation level of the background is larger than the gradation level of the non-edge portion. Mark data.   While the background gradation level is the maximum gradation level, the gradation level of the edge portion is set to the minimum gradation level, and the gradation level of the non-edge portion is higher than the maximum gradation level. 3. The mark data for scrolling according to claim 2, wherein an intermediate gradation level closer to the minimum gradation level is set.   While the background gradation level is the minimum gradation level, the gradation level of the edge portion is set to the maximum gradation level, and the gradation level of the non-edge portion is less than the minimum gradation level. 3. The scroll mark data according to claim 2, wherein the scroll mark data is set to an intermediate gradation level closer to the maximum gradation level.   2. The scroll according to claim 1, wherein the gradation level of the edge portion and the gradation level of the non-edge portion in the mark image are set to opposite levels with respect to the gradation level of the background. Mark data.   Whereas the background gradation level is an intermediate gradation level closer to the maximum gradation level than the minimum gradation level, the gradation level of the edge portion is set to the maximum gradation level. The scroll mark data according to claim 5, wherein the gradation level of the non-edge portion is set to a minimum gradation level.   While the background gradation level is an intermediate gradation level closer to the minimum gradation level than the maximum gradation level, the edge gradation level is set to the minimum gradation level. The scroll mark data according to claim 5, wherein the gradation level of the non-edge portion is set to the maximum gradation level.   A computer-readable recording medium on which the scroll mark data according to claim 1 is recorded. A liquid crystal display device that draws a mark image while moving the mark image in one scroll direction in a display area where the background gradation level is known on the liquid crystal display screen based on mark data representing the shape and gradation level of the mark image. And
For the reference mark data for which a constant gradation level is set, the gradation level of the edge portion which is the boundary portion in contact with the background in the scroll direction and the opposite direction in the mark image represented by the reference mark data. Mark data correction means for correcting the gradation level so that the difference with respect to the gradation level of the background is larger than the gradation level of the non-edge portion that is a portion other than the edge portion;
Scroll drawing means for drawing on the liquid crystal display screen while moving the mark image based on the corrected mark data obtained by the mark data correcting means in the scroll direction;
A liquid crystal display device comprising: A liquid crystal display device that draws a mark image while moving the mark image in one scroll direction in a display area where the background gradation level is known on the liquid crystal display screen based on mark data representing the shape and gradation level of the mark image. And
For the reference mark data for which a constant gradation level is set, the gradation level of the edge portion which is the boundary portion in contact with the background in the scroll direction and the opposite direction in the mark image represented by the reference mark data Mark data correction means for correcting the gradation level so that the gradation level of the non-edge portion, which is a portion other than the edge portion, is opposite to the background gradation level.
Scroll drawing means for drawing on the liquid crystal display screen while moving the mark image based on the corrected mark data obtained by the mark data correcting means in the scroll direction;
A liquid crystal display device comprising:

Images