JP2006139058A - Liquid crystal display device and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device in which a narrow frame and an expansion of a color reproduction range are compatible.
A display device includes a plurality of pixels having different areas of transmissive portions. In order to drive each pixel, a driving circuit such as a pixel driver or a switching circuit is required for each pixel. Therefore, the drive circuit is disposed in the light shielding portion of the pixel having a small area of the transmissive portion. For example, when one color pixel is composed of RGB sub-pixels, the area of the transmissive part of the green pixel is made smaller than the area of the transmissive part of the red and blue pixels, and there are three sub-pixels around the green pixel. The drive circuit is formed. As a result, it is possible to narrow the frame by efficiently concentrating the drive circuits. Also, by making the green pixel smaller than the red and blue pixels, the green luminance can be lowered relative to the red and blue luminances, and a well-balanced white color can be obtained.
[Selection] Figure 4

Description

  The present invention relates to a display device such as a liquid crystal display device having a plurality of pixels.

  In recent years, liquid crystal display devices have been used in portable devices such as mobile phones and personal digital assistants. In such a liquid crystal display device, one color pixel has red (R), green (G), and blue (B) (hereinafter, these colors are also simply referred to as “R”, “G”, and “B”, respectively). .)) Of sub-pixels each having a color filter. Conventionally, in order to drive these sub-pixels, a liquid crystal driving circuit such as a liquid crystal pixel driver or a switching circuit is provided in each sub-pixel region. For example, in Patent Document 1, a circuit frame of a drive circuit is formed in such a sub-pixel region, and a circuit frame is formed in a layer above a pixel switch, thereby realizing a narrow frame.

  However, the liquid crystal display device in Patent Document 1 has a drawback in that the aperture ratio of each sub-pixel decreases because a liquid crystal driving circuit is arranged for each sub-pixel.

  Further, in Patent Document 2, in order to freely set white color in a liquid crystal display device, the area ratio of each RGB color is changed, and a color reproduction range that can be displayed in combination with a spectral characteristic of a backlight or a color filter can be freely selected. Technology to do is released.

Japanese Patent Laid-Open No. 11-184406 JP-A-8-84347

  The present invention has been made in view of the above points, and an object of the present invention is to provide a display device capable of achieving both a narrow frame and an expansion of a color reproduction range.

  In one aspect of the present invention, in a liquid crystal display device that forms a pixel portion corresponding to intersections of a plurality of scanning lines and a plurality of data lines, the pixel portion includes a transmissive portion and a light-shielding portion having different areas. A driving circuit for the pixel and a driving circuit for another pixel having a larger area of the transmissive portion than the pixel are formed in the light shielding portion of the pixel having a plurality of pixels and having a small area of the transmissive portion.

  The liquid crystal display device has a plurality of pixels having different areas of the transmissive portion. The transmissive portion refers to a range in which light from the backlight in the pixel is transmitted. Further, the light shielding portion refers to a peripheral range other than the transmissive portion in the pixel, and refers to a range in which a circuit or the like is disposed. In order to drive each pixel, a driving circuit such as a pixel driver or a switching circuit is required for each pixel. Therefore, the drive circuit is disposed in the light shielding portion of the pixel having a small area of the transmission portion. That is, not only the drive circuit of a pixel having a small area of the transmissive part, but also other pixels having a larger area of the transmissive part, more preferably drive circuits of other adjacent pixels, Place around. As a result, the drive circuit can be efficiently arranged, and the limitation of the aperture ratio by the drive circuit can be suppressed.

  In a preferred example, the light shielding portion is covered with a black light shielding layer or a reflective electrode. As a result, the area of the drive circuit can be made invisible to the observer, and a decrease in contrast can be prevented.

  In one embodiment of the above display device, each of the plurality of pixels is a sub-pixel constituting a color pixel, a pixel having a small area of the transmissive portion is a green pixel, and the other pixels are a red pixel and a blue pixel. Pixel. When one color pixel is composed of RGB sub-pixels, the area of the transmissive part of the green pixel is made smaller than the area of the transmissive part of the red and blue pixels, and the sub-pixels of the three colors are arranged around the green pixel. It is preferable to form a drive circuit. As a result, it is possible to narrow the frame by efficiently concentrating the drive circuits. Also, by making the green pixel smaller than the red and blue pixels, the green luminance can be lowered relative to the red and blue luminances, and a well-balanced white color can be obtained.

  In another aspect of the above display device, each of the plurality of pixels is a sub-pixel constituting a color pixel, the pixel having a small area of the transmission portion is a green pixel and a cyan pixel, and the other pixel Are red pixels and blue pixels. When one color pixel is composed of three sub-pixels of RGB and cyan, the area of the transmission part of the green pixel and the cyan pixel is made smaller than the area of the transmission part of the red and blue pixels. In addition to the drive circuits for the pixels themselves, it is preferable to form one drive circuit for each of the red and blue pixels around the green and cyan pixels. For example, drive circuits for green and red pixels are formed around the green pixel, and drive circuits for cyan and blue pixels are formed around the cyan pixel. As a result, it is possible to narrow the frame by efficiently concentrating the drive circuits. Further, by providing cyan pixels in addition to the usual three RGB colors, the color reproduction range can be expanded.

  In another mode of the above display device, a pixel having a small area of the transmissive portion is provided with a reflective portion in the entire region, and the driving circuit is covered with the reflective portion. In the case where the reflective portion is formed in the entire region of the pixel where the area of the transmissive portion is small, the display region can be enlarged by providing a drive circuit under the reflective portion.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the present invention is applied to a liquid crystal display device.

[First embodiment]
(LCD panel)
First, the configuration of a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view schematically showing a schematic configuration of a liquid crystal display device 100 according to the first embodiment of the present invention. An image display area 20 is provided at the center of a transparent substrate 1 such as glass, and scanning lines and data lines described later are arranged in a matrix in the image display area 20. Red (R), green (G), and blue (B) color filters are provided at the intersections of the scanning lines and the data lines, and the sub-pixels SG that are respectively the red region, the green region, and the blue region are configured. Each subpixel SG is provided with a pixel electrode 10. The peripheral area of the image display area 20 captures input data from the outside via the scanning line driving circuit 111 for supplying scanning signals to the scanning lines, the data line driving circuit 113 for supplying data signals to the data lines, and the pad area 26. An input data line 114 is arranged.

  In the following description, when referring to a component regardless of color, for example, it is written as “pixel electrode 10”, and when the component is indicated by distinguishing colors, for example, “pixel electrode 10R” I will write as follows. In addition, when sub-pixels are indicated without distinguishing colors, they are simply referred to as “sub-pixel SG”, and when sub-pixel colors are indicated separately, sub-pixels in the red area are designated as “sub-pixel R” or “sub-pixel of R” The sub-pixel in the green region is referred to as “sub-pixel G” or “G sub-pixel”, and the sub-pixel in the blue region is referred to as “sub-pixel B” or “B sub-pixel”.

  Next, a cross-sectional configuration of the liquid crystal display device 100 along the cutting line A-A ′ will be described with reference to FIG. 2.

  In FIG. 2, the liquid crystal display device 100 includes an element substrate 91 and a color filter substrate 92 disposed so as to face the element substrate 91, with a frame-shaped sealing member 3 attached thereto, and liquid crystal is sealed inside. Thus, the liquid crystal layer 4 is formed.

  On the inner surface of the lower substrate 1, as described in FIG. 1, the pixel electrode 10 is formed for each subpixel SG. In addition, a reflective electrode 5 having a predetermined thickness is formed for each subpixel SG. The reflective electrode 5 is electrically connected to the pixel electrode 10 and is driven simultaneously with the pixel electrode 10. Each reflective electrode 5 is formed with a plurality of rectangular transmissive portions 25 (hereinafter also referred to as “transparent regions”). Each reflective electrode 5 can be formed of a thin film such as aluminum, an aluminum alloy, or a silver alloy. The transmissive portion 25 is formed so as to have an area of a predetermined ratio with respect to the total area of the sub-pixel SG for each sub-pixel SG arranged in a matrix in the pixel display region 20 in the vertical and horizontal directions.

  On the other hand, on the inner surface of the upper substrate 2, colored layers 6R, 6G, and 6B made of one of the three colors R, G, and B are formed for each sub-pixel region SG. A color filter is constituted by the colored layers 6R, 6G, and 6B. One color pixel AG represents an area for one color pixel composed of R, G, and B sub-pixels.

  In order to prevent light from entering from one subpixel to the other subpixel, a black light shielding layer BM is formed between the colored layers 6. The black light shielding layer BM can be made of a black resin material, for example, a black pigment dispersed in a resin. An overcoat layer 18 made of a transparent resin or the like is formed on the inner surfaces of the upper substrate 2 and the colored layer 6. The overcoat layer 18 has a function of protecting the colored layer 6 from corrosion and contamination by chemicals used during the manufacturing process of the color filter substrate. On the inner surface of the overcoat layer 18, a transparent common electrode 8 such as striped ITO (Indium-Tin-Oxide) is formed.

  As a feature of the present embodiment, a circuit element 21 in which liquid crystal driving circuits for driving the liquid crystals of the sub-pixels R, G, and B are aggregated is formed around (near) the green sub-pixel G. A data line 115 is formed on the inner surface of the lower substrate 1 and next to the pixel electrode 10 of the sub-pixel G. The circuit element 21 is electrically connected to the data line 115. The data line 115 is preferably formed of a conductive material such as chromium. The circuit element 21 is electrically connected not only to the pixel electrode 10G of the subpixel G but also to the pixel electrodes 10R and 10B of the subpixels R and B. The circuit element 21 is covered with the black light-shielding layer BM and the reflective electrode 5, thereby preventing a decrease in contrast.

  A retardation plate (¼ wavelength plate) 11 and a polarizing plate 12 are arranged on the outer surface of the lower substrate 1, and a retardation plate (¼ wavelength plate) on the outer surface of the upper substrate 2. 13 and a polarizing plate 14 are arranged. A backlight 15 is disposed below the polarizing plate 12. The backlight 15 is preferably a point light source such as an LED (Light Emitting Diode) or a combination of a linear light source such as a cold cathode fluorescent tube and a light guide plate.

  Now, when transmissive display is performed in the liquid crystal display device 100 of the first embodiment, the illumination light emitted from the backlight 15 travels along the path T shown in FIG. 2, and the pixel electrode 10, the colored layer 6 and the like. Pass through to the observer. In this case, the illumination light has a predetermined hue and brightness by passing through the colored layer 6. Thus, a desired color display image is visually recognized by the observer.

  On the other hand, when reflective display is performed in the liquid crystal display device 100 of the present embodiment, external light that has entered the liquid crystal display device 100 travels along a path R shown in FIG. That is, the external light incident on the liquid crystal display device 100 is reflected by the reflective electrode 5 and reaches the observer. In this case, the external light passes through the region where the colored layer 6 is formed, is reflected by the reflective electrode 5 on the lower side of the colored layer 6, and passes through the colored layer 6 again. And brightness. Thus, a desired color display image is visually recognized by the observer.

(Arrangement of circuit elements)
Next, the arrangement of circuit elements in the drive circuit of the present invention will be described.

  FIG. 3 is an example of an arrangement of circuit elements according to the first embodiment of the present invention. In FIG. 3, scanning lines 110-n (n is a natural number indicating a row of scanning lines) and data lines 112-m (m is a natural number indicating a column of data lines) are arranged in a matrix in the image display area. A liquid crystal pixel 105 of each sub-pixel is arranged at the intersection of the scanning lines. A column data line 115 branched from the input data line 114 along the data line 112-m is also arranged near the sub-pixel G. A scanning line driving circuit 111 is arranged in the peripheral area on the row side of the image display area, and a data line driving circuit 113 is arranged in the peripheral area on the column side of the image display area. A liquid crystal driving circuit 101 is disposed to drive the liquid crystal pixels 105 of the sub-pixels. The liquid crystal pixels 105R, 105G, and 105B for driving red (R), green (G), and blue (B) are driven. The liquid crystal driving circuits 101R, 101G, and 101B are collectively arranged around the green sub-pixel G.

  The scanning line driving circuit 111 is controlled by the scanning line driving circuit control signal 120, and a selection signal is output to the selected scanning line 110-n. A scanning line that is not selected is set to a non-selection potential. Similarly, the data line driving circuit 113 is controlled by the data line driving circuit control signal 121, the selection signal is output to the selected data line 112-m, and the non-selected data lines are set to the non-selected potential. Which scanning line and which data line is selected is determined by the control signals 120 and 121. That is, the control signals 120 and 121 are address signals that specify the selected pixel.

  The switching control circuit 109 disposed in the vicinity of the intersection of the selected scanning line 110-n and the selected data line 112-m receives the selection signal between the scanning line and the data line, and outputs an ON signal. When at least one of 110-n and data line 112-m is not selected, an off signal is output. That is, an ON signal is output only from the switching control circuit 109 of the pixel located at the intersection of the selected scanning line and data line, and an OFF signal is output from the other switching control circuit 109. In the present embodiment, the liquid crystal pixel driving circuit 101 is controlled by the on / off signal of the switching control circuit 109.

  Next, the configuration and operation of one liquid crystal pixel driving circuit 101 will be described. As shown in FIG. 3, the liquid crystal pixel driving circuit 101 includes a switching circuit 102, a memory circuit 103, and a liquid crystal pixel driver 104. The liquid crystal pixel driving circuit 101 is electrically connected to the liquid crystal pixel 105 in each sub-pixel, and can change the alignment of the liquid crystal by applying a voltage.

  The switching circuit 102 is turned on by an on signal from the switching control circuit 109 and is turned off by an off signal. When the switching circuit 102 becomes conductive, the data signal of the column data line 115 connected thereto is written to the memory circuit 103 via the switching circuit 102. On the other hand, when the switching circuit 102 is turned off by the off signal of the switching control circuit 109, the switching circuit 102 holds the data signal written in the memory circuit 103.

  The data signal held in the memory circuit 103 is supplied to the liquid crystal pixel driver 104. The liquid crystal pixel driver 104 has a first voltage 116 supplied to the first voltage signal line 118 or a second voltage 117 supplied to the second voltage signal line 119 depending on the level of the supplied data signal. Is supplied to the pixel electrode 10 of the liquid crystal pixel 105. The first voltage 116 is a voltage for setting the liquid crystal pixel 105 in a black display state when the liquid crystal panel is normally white display, while the second voltage 117 is a voltage for setting the liquid crystal pixel 105 in a white display state. .

  When the data signal held in the memory circuit 103 is at the H level, in the liquid crystal pixel driver 104, the gate connected to the first voltage signal line 118 for displaying the liquid crystal in black in the case of normally white display becomes conductive. The first voltage 116 is supplied to the pixel electrode 10 in each pixel, and the liquid crystal pixel 105 is in a black display state due to a potential difference from the reference voltage supplied to the common electrode 8. Similarly, when the held data signal is at the L level, the gate connected to the second voltage signal line 119 in the liquid crystal pixel driver 104 becomes conductive, and the second voltage 117 is supplied to the pixel electrode 10 and the liquid crystal. The pixel 105 is in a white display state.

  With the above configuration, when the power supply voltage, the first voltage 116, the second voltage 117, and the reference voltage can be driven at about the logic voltage and the screen display does not need to be rewritten, the display state is maintained by the data holding function of the memory circuit 103. So that almost no current flows.

  The liquid crystal pixel 105 has a pixel electrode 10 to which one of the first voltage 116 and the second voltage 117 output from the liquid crystal pixel driver 104 is selected and supplied in accordance with the held data signal. As shown in FIGS. 1 and 2, a potential difference between both electrodes is applied to the liquid crystal layer 4 provided for each pixel and interposed between the pixel electrode 13 and the common electrode 8, and liquid crystal molecules corresponding to the potential difference are applied. Depending on the orientation change, a black display state (also referred to as an on display state) and a white display state (also referred to as an off display state) are obtained.

  FIG. 4A is an enlarged plan view of a pixel of the liquid crystal display device according to the first embodiment of the present invention. 4 and 5, BM indicates a black light shielding layer. Each sub-pixel has a transmissive portion 25 for transmissive display and a reflective electrode 5 for reflective display around it. As described above, the liquid crystal drive circuits 101R, 101G, and 101B are formed around the green sub-pixel G. That is, around the green sub-pixel G, a circuit element 21 in which these three color liquid crystal driving circuits 101 are combined is formed. Therefore, the transmission part 25 of the sub-pixel G is smaller than the transmission part 25 of the sub-pixels R and B.

  FIG. 4B is an enlarged plan view of another example of the pixel of the liquid crystal display device according to the first embodiment of the present invention. As long as the circuit element 21 is arranged around the green sub-pixel G, the positional relationship with the transmission portion 25 is not limited. For example, as shown in FIG. 4B, the circuit element 21 may be disposed below the transmission portion 25G of the green sub-pixel G. As described in FIG. 2, the circuit element 21 is covered with the black light shielding layer BM and the reflective electrode 5 (in FIG. 4, it is covered with the black light shielding layer BM).

  Next, the example of patent document 1 which is a prior art is shown as a comparative example. FIG. 5 schematically shows the configuration of the pixel in Patent Document 1, and FIG. 6 shows an example of the arrangement of the circuit elements.

  As shown in FIGS. 5 and 6, in the prior art example, the liquid crystal driving circuits 101R, 101G, and 101B are formed adjacent to the sub-pixels R, G, and B, respectively. Each sub-pixel has the same size. Therefore, the area of the transmission part 25 of each of the subpixels R, G, and B depends on the ratio occupied by the liquid crystal driving circuit 101. That is, the larger the area of the liquid crystal driving circuit 101, the smaller the area of the transmissive portion 25 and the amount of transmitted light decreases, so that the overall luminance decreases.

  FIG. 7A shows the spectral characteristics of such a conventional liquid crystal display device. The spectral characteristics of the liquid crystal display device are determined by the spectral characteristics of the backlight and the color filter. As shown in FIG. 6A, the relative luminance of the sub-pixel G is increased. For this reason, the white color in the transmissive state of the liquid crystal cell is often a greenish white color unlike the true white color.

  FIG. 7B shows an example of the white position D and the above-described white transition in the xy chromaticity diagram (CIE: International Lighting Commission). Here, the solid line of the triangle indicates the color reproduction range based on the three primary colors R, G, and B. In this figure, the position of white E at 100% transmission in the sub-pixels R, G, and B decreases in the x direction and increases in the y direction with respect to the white D that is the reference of the color liquid crystal display device. Therefore, this also shows that the white position is shifted toward green.

  On the other hand, FIG. 8 shows spectral characteristics in the liquid crystal display device according to the first embodiment of the present invention. In this liquid crystal display device, as described above, the circuit element 21 reduces the area of the transmission part 25 of the subpixel G compared to the area of the transmission part 25 of the subpixels R and B. Therefore, the relative luminance of the sub-pixel G in FIG. 8A is weaker than the relative luminance of the sub-pixel G that is remarkable in FIG. 7A, which is the spectral characteristic of the conventional liquid crystal display device.

  FIG. 8B is an xy chromaticity diagram showing the white position D of the liquid crystal display device according to the first embodiment of the present invention. As shown in this figure, since the relative luminance of the sub-pixel G is weaker than that of the conventional example, the position of white E at 100% transmission in the sub-pixels R, G, B is the reference of the color liquid crystal display device. Located on white D. Therefore, the liquid crystal display device according to the first embodiment of the present invention can reproduce white that is closer to the reference white.

  In summary, the liquid crystal display device of the present invention has a problem that the conventional liquid crystal display device has, one is a decrease in luminance due to the aperture ratio limitation by the liquid crystal driving circuit, and the other is white color reproducibility. It solves the two problems of deterioration at once. In the liquid crystal display device of the present invention, the area of the transmissive part 25 of the subpixel G is made smaller than the area of the transmissive part 25 of the subpixels R and B, and the subpixel R has the reduced area in the subpixel G. , B liquid crystal driving circuits are arranged. Therefore, the area of the transmission part 25 of each of the sub-pixels R and B can be increased accordingly. On the other hand, the area of the transmission part 25 of the sub-pixel G is reduced as compared with the conventional liquid crystal panel, but there is no problem with this. This is because, as described above, in the conventional liquid crystal panel, since the relative luminance of the sub-pixel G is strong, the white color reproducibility is deteriorated. Therefore, the relative luminance of the sub-pixel G is rather weak. Because it was required to be. Therefore, by reducing the area of the transmission part 25 of the sub-pixel G and increasing the area of the transmission part 25 of the sub-pixels R and B, it is possible to increase the luminance as a whole pixel and improve white reproducibility. it can.

  In the case of a completely reflective liquid crystal display device, the entire region of the sub-pixel is a reflective electrode, and there is no need to irradiate light from the backlight, and display is performed only by reflection of external light at the reflective electrode. Can do. Therefore, in the case of such a liquid crystal display device, there is no possibility that the circuit elements block light like the transmission type liquid crystal display device. can do.

[Second Embodiment]
In the first embodiment, one color pixel is composed of pixels of three colors, red (R), green (G), and blue (B). However, in the second embodiment, one color pixel is further cyan. It is composed of a total of four sub-pixels including the pixel (C). The cyan pixel is configured using a cyan color filter in the same manner as the RGB pixel. FIG. 9 shows a color reproduction range when cyan is added in the xy chromaticity diagram (CIE: International Lighting Commission). Here, a color reproduction range based on the three primary colors R, G, and B is indicated by a broken line 201, and a color reproduction range when cyan is further added is indicated by a solid line 202. As can be seen from this figure, by adding cyan pixels, the direction indicated by the arrow, that is, the color reproduction range of cyan colors can be expanded.

  However, cyan only complements R, G, and B, which are the three primary colors of light in the first embodiment, and has the role of expanding the color reproduction range. Relative luminance with the same intensity as R, G, and B There is no need to have Therefore, in the second embodiment, in addition to the transmission part of the green (G) sub-pixel G, the area of the transmission part of the cyan sub-pixel C is reduced, and a liquid crystal driving circuit is provided around the sub-pixel C. To do.

  FIG. 10 is an example of an arrangement of circuit elements of the liquid crystal display device according to the second embodiment of the present invention, and FIG. 11 is an enlarged plan view of a pixel according to the second embodiment of the present invention.

  As shown in FIG. 10, in the second embodiment, the liquid crystal driving circuits 101R and 101G for driving the red (R) and green (G) liquid crystal pixels 105R and 105G are arranged around (near) the sub-pixel G. Arranged together. Similarly, the liquid crystal driving circuits 101B and 101C for driving the blue (B) and cyan (C) liquid crystal pixels 105B and 105C are arranged together around the sub-pixel C (in the vicinity). When one color pixel is composed of sub-pixels of four colors in this way, a liquid crystal driving circuit in two pixels, that is, a specific sub-pixel and a sub-pixel adjacent to the specific sub-pixel, and the area of the transmissive part among those sub-pixels is It is arranged around the smaller sub-pixel. In the first embodiment, the liquid crystal drive circuit of three subpixels is formed around one subpixel (that is, a green pixel) having a small area of the transmissive portion, whereas in the second embodiment, the transmissive portion is formed. A liquid crystal driving circuit for two subpixels is formed around one subpixel having a small area. Therefore, compared with the first embodiment, the second embodiment can further simplify the routing of circuit wiring while expanding the color reproduction range.

  FIG. 11A shows an enlarged plan view of a pixel of a liquid crystal display device having the arrangement of the circuit elements shown in FIG. Each sub-pixel has a transmissive portion 25 for transmissive display and a reflective electrode 5 for reflective display around it. As described above, the circuit element 21a in which the liquid crystal drive circuits 101R and 101G are aggregated is arranged around the transmission part 25G of the subpixel G, and the liquid crystal drive circuits 101C and 101B are arranged around the transmission part 25C of the subpixel C. The circuit element 21b that collects the above is disposed. Therefore, as described above, the transmissive portions 25 of the sub-pixels G and C are smaller than the transmissive portions 25 of the sub-pixels R and B.

  FIG. 11B is another example of an enlarged plan view of the pixel of the liquid crystal display device according to the second embodiment. As described above, even if the sub-pixel B and the sub-pixel C are exchanged, a liquid crystal driving circuit for driving a specific sub-pixel and the adjacent sub-pixel can be formed around the specific pixel. .

  In the second embodiment, a cyan color filter is used to expand the cyan color reproduction range, but the application of the present invention is not limited to this. Even when color filters of other colors are added to the three primary colors of RGB in order to expand the color reproduction range of other colors, as in the second embodiment, around the sub-pixels of the color filters of the other colors. A similar effect can be obtained by forming a liquid crystal driving circuit.

  In the second embodiment, the liquid crystal drive circuits 101R and 101G are arranged around the sub-pixel G, and the liquid crystal drive circuits 101B and 101C are arranged around the sub-pixel C. However, the combination of these is changed. Alternatively, the liquid crystal driving circuits 101B and 101G may be arranged around the sub pixel G, and the liquid crystal driving circuits 101R and 101C may be arranged around the sub pixel C. That is, one of the liquid crystal driving circuit 101G and 101R or 101B may be arranged around the subpixel G, and the other of the liquid crystal driving circuit 101C and 101R or 101B may be arranged around the subpixel C.

[Electronics]
Next, specific examples of electronic devices to which the liquid crystal display device 100 according to the present invention can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 12A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display panel according to the present invention is applied.

  Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 12B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the cellular phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

  Note that, as an electronic device to which the liquid crystal display device 100 according to the present invention can be applied, in addition to the personal computer shown in FIG. 12A and the mobile phone shown in FIG. Type / monitor direct-view type video tape recorder, car navigation device, pager, electronic notebook, calculator, word processor, workstation, videophone, POS terminal, digital still camera, etc.

It is a top view which shows the structure of a liquid crystal display panel. It is sectional drawing which shows the structure of a liquid crystal display panel. It is a block diagram which shows arrangement | positioning of the circuit element which concerns on 1st Embodiment. It is an enlarged plan view showing a schematic configuration of a pixel according to the first embodiment. It is an enlarged plan view which shows schematic structure of the pixel which concerns on a prior art example. It is a block diagram which shows arrangement | positioning of the circuit element which concerns on a prior art example. It is a spectral characteristic and xy chromaticity diagram concerning a conventional example. It is a spectral characteristic and xy chromaticity diagram concerning a 1st embodiment. It is an xy chromaticity diagram according to the second embodiment. It is a block diagram which shows arrangement | positioning of the circuit element which concerns on 2nd Embodiment. It is an enlarged plan view which shows schematic structure of the pixel which concerns on 2nd Embodiment. 6 shows examples of electronic devices to which the liquid crystal display device of the present invention is applied.

Explanation of symbols

5 reflective electrode, 10 pixel electrode, 6 colored layer, AG pixel, SG sub-pixel, BM black light shielding layer, 100 liquid crystal display device

Claims (6)

In a liquid crystal display device constituting a pixel portion corresponding to the intersection of a plurality of scanning lines and a plurality of data lines,
The pixel portion includes a plurality of pixels each having a transmission portion and a light shielding portion having different areas.
A liquid crystal display device, wherein a driving circuit of the pixel and a driving circuit of another pixel having a larger area of the transmissive portion than the pixel are formed in a light shielding portion of a pixel having a small area of the transmissive portion.   The liquid crystal display device according to claim 1, wherein the light shielding portion is covered with a black light shielding layer.   The liquid crystal display device according to claim 1, wherein the light shielding portion is covered with a reflective electrode. Each of the plurality of pixels is a sub-pixel constituting a color pixel,
4. The liquid crystal display device according to claim 1, wherein a pixel having a small area of the transmissive portion is a green pixel, and the other pixels are a red pixel and a blue pixel. 5. Each of the plurality of pixels is a sub-pixel constituting a color pixel,
4. The liquid crystal display device according to claim 1, wherein the pixels having a small area of the transmissive portion are a green pixel and a cyan pixel, and the other pixels are a red pixel and a blue pixel. 5. . 2. The liquid crystal display device according to claim 1, wherein a pixel having a small area of the transmissive portion is provided with a reflective portion in an entire region, and the driving circuit is covered with the reflective portion.

Images