JP2007279197A - Liquid crystal device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device wherein difference between chromaticities of transmission display and reflection display can be suppressed according to environmental light. <P>SOLUTION: The liquid crystal device is provided with a liquid crystal display panel, an illumination device, a light sensor and a light source control means. In the liquid crystal display panel, one sub pixel is constituted of a transmission region and a reflection region. The illumination device has a plurality of light sources respectively emitting beams having colors different from each other and irradiates the liquid crystal display panel with the beams. The light sensor detects respective light intensities of a plurality of wavelength components of the environmental light. The light source control means sets the chromaticity of beams emitted by the illumination device to be coincident with the chromaticity of the environmental light by adjusting optical intensities of the plurality of light sources for every color based on the light intensities of the plurality of wavelength components. Thereby, difference between chromaticities of transmission display and reflection display can be suppressed according to the environmental light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal device suitable for use in displaying various information.

In the liquid crystal device, an illumination device is provided as a backlight on the back side of the liquid crystal display panel in order to perform transmissive display. An illuminating device having an LED (Light Emitting Diode) of each color of RGB as a light source generates white light by mixing light emitted from each LED, and the generated white light is generated on the back side of the liquid crystal display panel. Irradiate. In the liquid crystal device, red (R) and green (G) white light irradiated from the backlight is laminated on the substrate of the liquid crystal display panel.
Color display is realized by transmitting light of each wavelength of blue (B) through a color filter that transmits light.

In the transflective liquid crystal device, the light emitted from the illumination device is transmitted through the liquid crystal display panel and displayed, and external light incident on the liquid crystal display panel is reflected and transmitted through the color filter. Reflective display for display can be performed. However, since the chromaticity of the white point in the reflective display is different from the chromaticity of the white point in the transmissive display, in the transflective liquid crystal device, the reflective display and the transmissive display are performed. As a result, there is a difference in the appearance of the display screen. Note that in the liquid crystal device described in Patent Document 1, in the transmissive region and the reflective region of the subpixel, the same material is used for both regions as a color filter, so that the reflective display and the transmissive display are performed. The resulting chromaticity difference is suppressed.

JP 2003-98337 A

However, in a transflective liquid crystal device, when reflective display is performed, when the chromaticity of ambient light used as external light changes, for example, the user moves indoors from the outdoors and is used as external light. When the ambient light changes from sunlight to fluorescent light, the chromaticity of the white point in the reflective display is also changed by each ambient light.

The present invention has been made in view of the above points, and an object thereof is to provide a liquid crystal device capable of suppressing a chromaticity difference between a transmissive display and a reflective display in accordance with ambient light.

In one aspect of the present invention, the liquid crystal device includes a liquid crystal display panel in which one subpixel includes a transmissive region and a reflective region, and a plurality of light sources that emit light of different colors, respectively. An illumination device that irradiates light on the panel, a light sensor that detects each light intensity in a plurality of wavelength components of ambient light, and a light intensity of each of the plurality of light sources based on each light intensity in the plurality of wavelength components Light source control means for adjusting the chromaticity of the light emitted from the illumination device to the chromaticity of the ambient light by adjusting for each color.

The liquid crystal device is a transflective liquid crystal device, a liquid crystal display panel, an illumination device,
An optical sensor and a light source control means are provided. In the liquid crystal display panel, one subpixel is composed of a transmission region and a reflection region. The illumination device includes a plurality of light sources that emit light of different colors, and irradiates the liquid crystal display panel with light. As the light source, for example, LED (Light Emitting D
iode) is used. The optical sensor detects the light intensity of each of a plurality of wavelength components of ambient light. The light source control means adjusts the light intensity of the plurality of light sources for each color based on the light intensity of each of the plurality of wavelength components, thereby changing the chromaticity of the light emitted from the illumination device to the color of the ambient light Match the degree. This makes it possible to make the chromaticity coordinates of the white point when performing reflective display and the chromaticity coordinate of the white point when performing transmissive display equal to the ambient light, and the chromaticity difference between the transmissive display and the reflective display. Can be suppressed.

In a preferred embodiment of the above liquid crystal device, the light source control means adjusts the light intensity ratio of the plurality of wavelength components of the ambient light to be the light intensity ratio of the light intensity of the plurality of light sources.

In another aspect of the above liquid crystal device, the illumination device includes a plurality of light sources that emit light of each color of RGB, and the optical sensor detects light intensity of each wavelength component of RGB of ambient light. . Thereby, in a transflective liquid crystal device using an illumination device having light sources of three colors of RGB,
According to the ambient light, the chromaticity coordinates of the white point when performing reflective display and the chromaticity coordinate of the white point when performing transmissive display can be made equal, and the chromaticity difference between the transmissive display and the reflective display can be suppressed. Can do.

In still another aspect of the invention, an electronic apparatus including the electro-optical device described above in a display unit can be configured.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Configuration of liquid crystal device]
First, the configuration and the like of the liquid crystal device 100 according to the present embodiment will be described with reference to FIGS.

FIG. 1 is a plan view schematically showing a schematic configuration of a liquid crystal device 100 according to the present embodiment. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, the vertical direction (row direction) of the drawing is the Y direction, and
The horizontal direction (row direction) in the drawing is defined as the X direction. In FIG. 1, R (red), G (green),
Each region corresponding to B (blue) represents one sub-pixel SG, and one row and three columns of sub-pixels SG corresponding to RGB represent one display pixel AG.

FIG. 2 is an enlarged cross-sectional view of one display pixel AG along the cutting line AA ′ in the liquid crystal device 100. As shown in FIG. 2, the liquid crystal device 100 includes a lighting device 10 and a liquid crystal display panel 3.
It is composed of 0. In the liquid crystal display panel 30, an element substrate 91 and a color filter substrate 92 disposed to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is enclosed inside the sealing material 5. Thus, the liquid crystal layer 4 is formed. The liquid crystal used for the liquid crystal layer 4 is, for example, a TN (Twisted Nematic) type liquid crystal. The illumination device 10 is provided on the outer surface of the element substrate 91 of the liquid crystal display panel 30.

A liquid crystal device 100 according to the present embodiment is a liquid crystal device for color display configured using three colors of R, G, and B, and an α-Si TFT (Thin Film Tran) as a switching element.
This is an active matrix drive type liquid crystal device using a sistor element.

A planar configuration of the element substrate 91 will be described. On the inner surface of the element substrate 91, a plurality of source lines 32, a plurality of gate lines 33, a plurality of α-Si TFT elements 37, a plurality of reflective layers 7, a plurality of pixel electrodes 34, a driver IC 40, an external connection are mainly provided. Wiring 35 and FPC (Flexib
le Printed Circuit) 41 is formed or mounted.

As shown in FIG. 1, the element substrate 91 has a protruding region 31 that protrudes outward from one side of the color filter substrate 92, and a driver IC is formed on the protruding region 31.
40 is implemented. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35, and the other end side of the plurality of external connection wirings 35 is electrically connected to the FPC 41. It is connected. Each source line 32 is formed so as to extend in the Y direction and at an appropriate interval in the X direction, and one end side of each source line 32 is connected to an output side terminal (not shown) of the driver IC 40. Electrically connected.

Each gate line 33 includes a first wiring 33a formed so as to extend in the Y direction, and a second wiring 33b formed so as to extend in the X direction from the terminal portion of the first wiring 33a. ing. The second wiring 33 b of each gate line 33 is formed to extend in the direction intersecting each source line 32, that is, in the X direction and at an appropriate interval in the Y direction. One end of one wiring 33a is electrically connected to a terminal (not shown) on the output side of the driver IC 40. Α− is located at the position corresponding to the intersection of the second wiring 33 b of each source line 32 and each gate line 33.
A TFT element 37 is provided, and each α-TFT element 37 is electrically connected to each source line 32, each gate line 33, each pixel electrode 34, and the like. Each α-TFT element 37 and each pixel electrode 34 are provided at positions corresponding to each sub-pixel SG on the substrate 1 such as glass. Each pixel electrode 34 is formed of a transparent conductive material such as ITO (Indium-Tin Oxide). Further, as shown in FIG. 2, a reflective layer 7 is provided with a metal such as aluminum (Al) at a position corresponding to each sub-pixel SG on the substrate 1. Each sub-pixel SG includes a region where the reflective layer 7 is provided and a region where the reflective layer 7 is not provided, and the ambient light incident on the liquid crystal display panel 30 in the region where the reflective layer 7 is provided. Light, that is, outside light, is reflected by the reflective layer 7, and the light from the lighting device 10 can pass through a region where the reflective layer 7 is not provided. Therefore, a region where the reflective layer 7 is provided is a reflective region, and a region where the reflective layer 7 is not provided is a transmissive region.

A region in which a plurality of display pixels AG are arranged in a matrix in the X and Y directions is an effective display region V (a region surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed. The area outside the effective display area V is a frame area 38 that does not contribute to display. An alignment film (not shown) is formed on the inner surface of each source line 32, each gate line 33, each α-TFT element 37, each pixel electrode 34, and the like.

Next, the planar configuration of the color filter substrate 92 will be described. As shown in FIG. 2, a color filter substrate 92 is formed on a substrate 2 such as glass on a light shielding layer (generally referred to as “black matrix”, hereinafter simply abbreviated as “BM”), and three colors of RGB. Colored layers 6R, 6G,
6B, common electrode 8 and the like. The BM is formed at a position that partitions the sub-pixels SG for each color. In the following description or drawings, when a component is indicated without specifying the RGB color, it is simply written as “colored layer 6”, and when the component is indicated by distinguishing the RGB color, For example, it is written as “colored layer 6R”. The RGB sub-pixels SG have colored layers 6R, 6G, and 6B, respectively. These colored layers 6R, 6G, 6B
It functions as a color filter for each color. The common electrode 8 is made of a transparent conductive material such as ITO like the pixel electrode, and is formed over substantially the entire surface of the color filter substrate 92. The common electrode 8 is electrically connected to one end side of the wiring 36 in the corner area E1 of the sealing material 5, and the other end side of the wiring 36 is electrically connected to an output terminal corresponding to the COM of the driver IC 40. It is connected to the.

Next, the lighting device 10 will be described. The lighting device 10 includes a light guide plate 11 and a light source unit 12. The light source unit 12 emits light L to the end surface 11 c of the light guide plate 11. Light source unit 12
As will be described in detail later, a plurality of LEDs (Light Emitting Diodes) 13 are provided as light sources. The LED 13 is composed of RGB three-color LEDs 13R, 13G, and 13B. Each color LED 13 is connected to a current control circuit 15. The current control circuit 15 is connected to the optical sensor 1
6 is connected.

The optical sensor 16 detects the light intensity of each RGB wavelength component of the ambient light. Specifically, the optical sensor 16 is an optical sensor that detects the light intensity of the R wavelength component of the environmental light, an optical sensor that detects the light intensity of the G wavelength component of the environmental light, and the B wavelength component of the environmental light. Each optical sensor of the optical sensor that detects the light intensity may be configured, and each wavelength component of RGB is obtained by detecting light including all wavelengths of RGB with one optical sensor and taking the spectrum thereof. The light intensity may be obtained.

The current control circuit 15 is based on the light intensity detected by the optical sensor 16 and the LED 13
To control the current supplied to the. If the current supplied to the LED 13 is increased, the light intensity of the light emitted from the LED 13 increases, and if the current supplied to the LED 13 is decreased, the LED
The light intensity of the light emitted from 13 is reduced. This current control circuit 15 functions as light source control means in the present invention.

A case where transmissive display is performed in the liquid crystal device 100 will be described. As shown in FIG. 2, the light L emitted from the light source unit 12 enters the light guide plate 11 through an end surface (hereinafter referred to as “light incident end surface”) 11 c of the light guide plate 11, and the output surface 11 a of the light guide plate 11. The direction is changed by repeating the reflection on the reflecting surface 11b. The light L is emitted from the emission surface 11a of the light guide plate 11 toward the liquid crystal display panel 30 when the angle formed between the emission surface 11a of the light guide plate 11 and the light L exceeds a critical angle.

The light L emitted from the emission surface 11 a of the light guide plate 11 toward the liquid crystal display panel 30 passes through the liquid crystal display panel 30. The liquid crystal device 100 is illuminated by the light L passing through the liquid crystal display panel 30. Thereby, the liquid crystal device 100 can display images such as letters, numbers, and figures, and an observer can visually recognize the images.

A case where reflective display is performed in the liquid crystal device 100 will be described. As shown in FIG. 2, external light R incident on the liquid crystal display panel 30 from the outside passes through the colored layer 6 and the liquid crystal layer 4 and is reflected by the reflective layer 7. The external light R reflected by the reflective layer 7 passes through the liquid crystal layer 4 and the colored layer 6 again, and then exits outside the liquid crystal display panel 30. Thereby, the liquid crystal device 100 can display images such as letters, numbers, and figures, and an observer can visually recognize the images.

In the liquid crystal device 100, G1, G2,..., Gm−1, Gm (by the driver IC 40 based on the signal and power from the FPC 41 side connected to the main board or the like of the electronic device.
The gate lines 33 are sequentially and exclusively selected one by one in the order (m is a natural number), and a gate signal of a selection voltage is supplied to the selected gate line 33 while the other unselected gate lines 3 are selected.
3 is supplied with a gate signal of a non-selection voltage. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 34 located at positions corresponding to the selected gate lines 33, respectively, corresponding S1, S2,..., Sn-1, Sn ( n is a natural number) source line 3
2 and the α-TFT element 37. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal device 100 is switched to the non-display state or the intermediate display state.

The liquid crystal display panel 30 uses the α-TFT element 37 as a switching element. However, the liquid crystal display panel 30 is not limited to this. Instead, a polysilicon TFT or a TFD (Thin Film Diod) is used.
e) An element may be used.

The liquid crystal display panel 30 is not limited to a liquid crystal display panel having a liquid crystal layer made of TN liquid crystal as described above. Instead, a VA (Vertical Alignment) method, IPS (In
A liquid crystal display panel such as a plane switching (FFE) method or a FFS (Fringe Field Structure) method can also be used.

(White adjustment in RGB LEDs)
As described above, when transmissive display is performed in the liquid crystal device 100, color display is performed by transmitting the white light emitted from the illumination device 10 through the color filter.

FIG. 3A shows a spectral distribution of light of a general lighting device having LEDs of RGB colors. In FIG. 3A, the horizontal axis represents the light wavelength [nm], and the vertical axis represents the relative emission intensity [%].
Respectively. The light of each color of RGB is emitted from the LED of each color. Therefore, as shown in the graph of FIG. 3A, the light of the illumination device having the LEDs of each color of RGB has a peak wavelength for each color. In a liquid crystal device having such a backlight, R
White light is generated by mixing light emitted from LEDs of each color of GB.

FIG. 3B shows the transmittance of each of the RGB color filters. FIG. 3 (b)
, The horizontal axis indicates the wavelength [nm] of light, and the vertical axis indicates the transmittance [%]. As shown in FIG. 3B, the transmittance of each RGB color filter has the property that the transmittance is highest in the wavelength range of each RGB color. Therefore, in the liquid crystal device, when displaying each color of RGB, it is possible to perform color display by allowing the colored layer 6 of each color to transmit only light in the wavelength range of each color.

FIG. 4 shows the color reproduction range of the liquid crystal device when each of the light sources described above is used on a chromaticity diagram of the International Commission on Illumination (CIE).

A color reproduction range 401 is a color reproduction range based on the wavelength sensitivity characteristics of human eyes, and indicates a color reproduction range that can be recognized by humans. The color reproduction range 402 is NTSC (National Tel
evision System Committee) color reproduction range that can be reproduced by a display device. A color reproduction range 403 indicates a color reproduction range achieved by a liquid crystal device having three general RGB color layers. The color reproduction range 403 is, for example, an NTSC ratio (color reproduction range 402
Ratio) is 50%. Point W indicates the chromaticity coordinates of the white point when transmissive display is performed in this liquid crystal device. Point Wa indicates the chromaticity coordinates (X, Y) = (0.31, 0.33) of the white point when reflection display is performed using sunlight as external light. Since the color temperature is 6500 [K], the point Wa is also called D65 and is an ideal white point. A point Wb is a chromaticity coordinate (X, Y) of a white point when reflection display is performed using light from a predetermined fluorescent lamp as external light.
) = (0.32, 0.35).

As can be seen from FIG. 4, in a general liquid crystal device, when transmissive display is performed, the white point W is closer to the blue side than the points Wa and Wb. That is, in a general liquid crystal device, the white display when performing transmissive display is a white display that is more bluish than the white display when performing reflective display using sunlight or a fluorescent lamp as external light. For this reason, a chromaticity difference occurs between the case of performing reflective display and the case of performing transmissive display.

Therefore, in the liquid crystal device 100 according to this embodiment, the current control circuit 15 uses the light intensity of each wavelength component of RGB of the ambient light detected by the optical sensor 16 to emit light of the light emitted from the LED 13 of each color. By adjusting the intensity for each color, the chromaticity of the light emitted from the illumination device 10 is matched with the chromaticity of the ambient light. Hereinafter, the LED light intensity adjustment processing will be described with reference to the flowchart shown in FIG.

First, after detecting the light intensity of each wavelength component of RGB of the ambient light, the optical sensor 16 supplies a detection signal to the current control circuit 15 (step S11). The current control circuit 15 obtains the light intensity ratio of each wavelength component of RGB of the ambient light based on the detection signal, and determines whether or not it is equal to the light intensity ratio of the light of each color emitted from the LED 13 of each color. (Step S12). Specifically, the current control circuit 15 previously stores in a memory or the like a table that describes the relationship between the amount of current supplied to each color LED 13 and the light intensity of the light emitted from each color LED 13 with respect to the current amount. In addition, based on the table, the current light intensity of the light emitted from the LED 13 of each color is obtained from the amount of current currently supplied to the LED 13 of each color. And current control circuit 1
5 represents the light intensity ratio of the light of each color emitted from the obtained LED 13 of each color and the RG of the ambient light.
The light intensity ratio of each wavelength component of B is compared. If the current control circuit 15 determines that the light intensity ratio of each RGB component of the ambient light is equal to the light intensity ratio of each color light emitted from the LED 13 of each color, the current control circuit 15 ends the process (step S12). : Yes).

On the other hand, the current control circuit 15 includes a light intensity ratio of each wavelength component of RGB of the ambient light and each color LED.
When it is determined that the light intensity ratios of the lights of the respective colors emitted from 13 are not equal (step S1)
2: No), so that the light intensity ratio of the light of each color emitted from the LED 13 of each color is equal.
The amount of current supplied to each color LED 13 is adjusted based on the table stored in the memory described above. Thereby, the light intensity ratio of the light of each color emitted from the LED 13 of each color becomes equal to the light intensity ratio of each color component of RGB of the ambient light, and the chromaticity of the light emitted from the illumination device 10 is the ambient light. (Step S13). Thereafter, the current control circuit 15 ends the process.

In step 13, for example, when the detected ambient light is sunlight, the current control circuit 15: current amount supplied to the LED 13B: current amount supplied to the LED 13G: LED 13R
Current is supplied to the LEDs 13 of each color at a ratio of 4.3: 8.6: 20.
Thereby, the chromaticity of the light emitted from the illumination device 10 is matched to the chromaticity of sunlight, and the chromaticity coordinate of the white point of the liquid crystal device 100 when performing transmissive display uses sunlight as external light. Thus, the chromaticity coordinate (X, Y) = (0.31, 0.33) of the white point in the case of performing reflective display.

Further, the current control circuit 15, for example, when the detected ambient light is the predetermined fluorescent lamp described above, the amount of current supplied to the LED 13B: the amount of current supplied to the LED 13G: LED 13R
Current is supplied to the LEDs 13 of each color at a ratio of 3.6: 9: 20. Thereby, the chromaticity of the light emitted from the illumination device 10 is matched with the chromaticity of the light of the predetermined fluorescent lamp, and the chromaticity coordinate of the white point of the liquid crystal device 100 when performing transmissive display is a predetermined value. Chromaticity coordinates (X, Y) = (0.32, 0.35) when reflective display is performed using fluorescent light as external light
).

FIG. 6 shows the color reproduction range by the liquid crystal device 100 according to the present embodiment.
) On the chromaticity diagram.

When the ambient light is sunlight, the color reproduction range 501a, that is, the amount of current supplied to the LED 13B: the amount of current supplied to the LED 13G: the amount of current supplied to the LED 13R = 4.3: 8.6: 2
A color reproduction range in the case where transmissive display is performed by supplying current to the LEDs 13 of each color at a ratio of 0 is shown. The color reproduction range 501a is an R chromaticity coordinate (X, Y) indicated by a point 501aR.
= (0.653, 0.301), G chromaticity coordinates (X, Y) indicated by a point 501aG = (0.1
60, 0.629), B chromaticity coordinates (X, Y) = (0.133, 0.
122), and the NTSC ratio is 81.75 [%]. At this time, the chromaticity coordinate of the white point is the chromaticity coordinate (0.
31, 0.33).

The color reproduction range 501b is obtained when the ambient light is the predetermined fluorescent lamp described above, that is, the LED 13B.
Current supplied to LED: current supplied to LED 13G: current supplied to LED 13R = 3
. The color reproduction range is shown when a current is supplied to the LEDs 13 of each color at a ratio of 6: 9: 20 and transmissive display is performed. The color reproduction range 501b includes R chromaticity coordinates (X, Y) = (0.657, 0.303) indicated by a point 501bR and G chromaticity coordinates (X, Y indicated by a point 501bG).
) = (0.160, 0.645), B chromaticity coordinates (X, Y) indicated by a point 501bB = (0.
132, 0.138), and the NTSC ratio is 82.63 [%]. The chromaticity coordinates of the white point at this time are the chromaticity coordinates (0.3
2, 0.35).

As described above, in the liquid crystal device 100 according to the present embodiment, the current control circuit 15 uses each color LED based on the light intensity of each RGB wavelength component of the ambient light detected by the optical sensor 16.
By adjusting the light intensity of the light emitted from 13 for each color, the chromaticity of the light emitted from the illumination device 10 is matched with the chromaticity of the ambient light. By doing so, the liquid crystal device 100 can equalize the chromaticity coordinates of the white point when performing the reflective display and the chromaticity coordinate of the white point when performing the transmissive display in accordance with the ambient light. The chromaticity difference between the transmissive display and the reflective display can be suppressed.

[Modification]
In the above-described embodiment, the ambient light is assumed to be sunlight, light of a predetermined fluorescent lamp,
Needless to say, the present invention is not limited to this, and instead, any other external light source can be used.

In the above-described embodiment, the RGB three-color LEDs are used as the light source of the lighting device 10, but the present invention is not limited to this, and four or more LEDs may be used instead. For example, in addition to RGB three-color LEDs, a total of four-color LEDs may be used in which LEDs that emit light of a color complementary to any one of RGB are added.

When using LEDs of four or more colors, the optical sensor 16 detects the light intensity of the wavelength components of the four or more colors of the ambient light, and the current control circuit 15 determines the light intensity of the wavelength components of the four or more colors. By adjusting the light intensity of the LED for each color, the chromaticity of the light emitted from the lighting device 10 is matched with the chromaticity of the ambient light. This also allows the liquid crystal device 100 to equalize the chromaticity coordinates of the white point when performing reflective display and the chromaticity coordinate of the white point when performing transmissive display according to ambient light. It is possible to suppress the chromaticity difference of the reflective display.

[Other examples]
In the above description, three colors of RGB have been described as the color (colored region) of the colored layer functioning as a color filter. However, the application of the present invention is not limited to this, and the four colored layers, that is, 4
One display pixel can be constituted by a colored region.

Specifically, the four-color colored region has a visible light region (380-7) whose hue changes according to the wavelength.
80 nm), a colored region of blue hue (also referred to as “first colored region”), a colored region of red hue (also referred to as “second colored region”), and a hue from blue to yellow. 2 selected in
It consists of a colored region of a kind of hue (also referred to as “third colored region” or “fourth colored region”). Here, the term “system” is used. For example, if it is a blue system, the color is not limited to a pure blue hue, and includes a blue-violet color, a blue-green color, and the like. If it is a red hue, it is not limited to red but includes orange. These colored regions may be composed of a single colored layer, or may be composed of a plurality of colored layers having different hues. In addition, although these colored regions are described in terms of hue, the hue can be set by changing the saturation and lightness as appropriate.

The specific hue range is
-The colored region of the blue hue is from violet to blue-green, more preferably from indigo to blue.
-The colored region of red hue is from orange to red.
-One coloring area | region selected by the hue from blue to yellow is blue to green, More preferably, it is blue green to green.
-The other coloring area | region selected by the hue from blue to yellow is green to orange, More preferably, it is green to yellow. Or it is green to yellowish green.

Here, the same hue is not used for each colored region. For example, when a green hue is used in two colored regions selected from hues of blue to yellow, the other uses a blue or yellowish green hue for one green.

Thereby, a wider range of color reproducibility than the conventional RGB colored region can be realized.

In the above, a wide range of color reproducibility by the colored areas of four colors has been described in terms of hue, but as another specific example, it can be expressed as follows with the wavelength of light transmitted through the colored areas.
The blue colored region is a colored region having a wavelength peak of light transmitted through the colored region at 415 to 500 nm, preferably at 435 to 485 nm.
The red colored region is a colored region having a wavelength peak of light transmitted through the colored region of 600 nm or more, and preferably a colored region of 605 nm or more.
-One colored region selected by hue from blue to yellow is a colored region having a wavelength peak of 485-535 nm of light transmitted through the colored region, preferably a colored region having a wavelength of 495-520 nm. .
The other colored region selected with a hue from blue to yellow is a colored region having a wavelength peak of light transmitted through the colored region of 500-590 nm, preferably 510-585 nm, or 530- This is a colored region at 565 nm.

In the case of transmissive display, this wavelength is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

As another specific example, when a colored region of four colors is expressed by an x, y chromaticity diagram, it is as follows.
The blue colored region is a colored region where x ≦ 0.151 and y ≦ 0.200, preferably 0.134
≦ x ≦ 0.151, 0.034 ≦ y ≦ 0.200.
The red colored region is a colored region having 0.520 ≦ x, y ≦ 0.360, preferably 0.550
≦ x ≦ 0.690 and 0.210 ≦ y ≦ 0.360.
-One of the colored areas selected in hues from blue to yellow is a colored area where x ≦ 0.200 and 0.210 ≦ y, preferably a colored area where 0.080 ≦ x ≦ 0.200 and 0.210 ≦ y ≦ 0.759 is there.
-The other colored region selected with a hue from blue to yellow is a colored region in the range of 0.257 ≦ x, 0.450 ≦ y, preferably a colored region in the range of 0.257 ≦ x ≦ 0.520, 0.450 ≦ y ≦ 0.720 is there.

In the case of transmissive display, the x, y chromaticity diagram is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

These four colored areas can be applied within the above-described range when the sub-pixel includes a transmission area and a reflection area.

Moreover, the following are preferable as an RGB light source in the illuminating device 10.
・ B is the wavelength peak of emitted light at 435 nm to 485 nm ・ G is the wavelength peak of emitted light at 520 nm to 545 nm ・ R is the wavelength peak of emitted light at 610 nm to 650 nm And if a color filter is appropriately selected according to the wavelength of the RGB light source, a wider range of color reproducibility can be obtained.

Further, when four-color LEDs are used as the light source in the illumination device 10, the four-color L
The ED is preferably a color corresponding to four colored layers of a color filter of a liquid crystal display panel described later.

Specific examples of the configuration of the above four colored regions include the following.
・ Colored areas of red, blue, green and blue-green ・ Colored areas of red, blue, green and yellow ・ Colored areas of red, blue, dark green and yellow ・ Hue is red, blue, Emerald green, yellow coloring area Hue is red, blue, emerald green, yellow green coloring area / hue is red, blue, dark green, yellow green coloring area / hue is red, blue green, dark green, yellow green Coloring area
[Electronics]
Next, an embodiment in which the liquid crystal device according to the present embodiment is used as a display device of an electronic apparatus will be described.

First, an example in which the liquid crystal 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. 7A 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 device 100 according to the present invention is applied.

Next, an example in which the liquid crystal device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 7B is a perspective view showing the configuration of the mobile phone. As shown in the figure
A mobile 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 device 100 according to the present invention is applied.

Note that, as an electronic device to which the liquid crystal device 100 according to the present invention can be applied, in addition to the personal computer shown in FIG. 7A and the mobile phone shown in FIG. Monitor direct-view video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, digital still cameras, etc.

It is a top view of the liquid crystal device concerning this embodiment. It is sectional drawing of the liquid crystal device which concerns on this embodiment. It is a figure which shows the characteristic of a color filter and RGB LED. It is a chromaticity diagram showing a color reproduction range of a general liquid crystal device having RGB LEDs. It is a flowchart which shows LED light intensity adjustment processing. It is a chromaticity diagram showing the color reproduction range of the liquid crystal device according to the present embodiment. It is a figure which shows the example of the electronic device to which the liquid crystal device of this embodiment is applied.

Explanation of symbols

12 light source unit, 13 LED, 10 lighting device, 15 current control circuit, 16
Optical sensor, 30 liquid crystal display panel, 100 liquid crystal device

Claims (4)

A liquid crystal display panel in which one sub-pixel includes a transmissive region and a reflective region;
An illumination device that irradiates the liquid crystal display panel with light having a plurality of light sources each emitting light of a different color;
An optical sensor for detecting the light intensity of each of a plurality of wavelength components of ambient light;
Light source control for adjusting the chromaticity of the light emitted from the illumination device to the chromaticity of the ambient light by adjusting the light intensity of the plurality of light sources for each color based on the respective light intensities in the plurality of wavelength components And a liquid crystal device. 2. The liquid crystal device according to claim 1, wherein the light source control unit adjusts the light intensity ratio of the plurality of wavelength components of the ambient light to be the light intensity ratio of the light intensity of the plurality of light sources. The lighting device includes a plurality of light sources that emit light of each color of RGB,
The liquid crystal device according to claim 1, wherein the optical sensor detects the light intensity of each wavelength component of RGB of environmental light. An electronic apparatus comprising the liquid crystal device according to claim 1 in a display portion.

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