JP2005338370A - Electrooptical apparatus and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical apparatus wherein color reproducibility in a wide color region is realized and coloring generated at the time of white display is prevented, and to provide electronic equipment. <P>SOLUTION: The electrooptical apparatus is provided with an illuminator having a plurality of peak wavelengths in spectral characteristics of emitted light and a color filter with a plurality of colored parts formed, wherein the intensity of a nearly center peak wavelength is lower than those of the other peak wavelengths among the plurality of peak wavelengths in the spectral characteristics of the illuminator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electro-optical device and an electronic apparatus.

Conventionally, since the liquid crystal display device is a non-light-emitting type, a liquid crystal display such as a reflective type using ambient light as a light source, a transmissive type using a specific light source, or a transflective type having both of these characteristics The device is widely known. Among these, liquid crystal display devices called a transmissive type and a semi-transmissive type mainly emit light by using a backlight.
By the way, the color finally emitted from the liquid crystal display screen is mainly related to the matching (matching) between the spectral characteristics of the backlight and the spectral characteristics of the color filter. In consideration of such characteristics, a liquid crystal display device that realizes color reproduction of a wide color gamut by matching the spectral characteristics of the backlight and the color filter has been proposed (for example, Patent Document 1).
JP-A-6-42029

However, in the liquid crystal display device, since the color filter is composed of three colors of R (red), G (green), and B (blue), the color filter is narrower than the color region that can be recognized by humans. There is a problem that there is a limit to color reproduction with the three primary colors.
Therefore, a liquid crystal display device having a color filter in which a fourth color C (cyan) is added to three primary colors of R (red), G (green), and B (blue) has been proposed. By adding the fourth color to the color filter in this manner, it is possible to realize color reproduction with a wide color gamut compared to color reproduction using the three primary colors of the color filter.
However, the liquid crystal display device disclosed in Patent Document 1 has a problem that the color reproduction is determined by matching the spectral characteristics of the backlight and the color filter, but the spectral characteristics of the backlight are not considered. there were. That is, when a commonly used backlight is used for the above four-color filter, C (cyan) of the color filter has a wavelength close to the wavelength of G (green), and therefore C (cyan) from the wavelength region of G (green). There is a problem that the intensity of the wavelength in the region becomes twice or more, and coloring occurs in white display.

  The present invention has been made in view of the above problems, and an object thereof is to provide an electro-optical device and an electronic apparatus that prevent color reproducibility by a wide color gamut and coloring at the time of white display.

In order to solve the above problems, the present invention provides an electro-optical device including an illuminating device having a plurality of peak wavelengths in the spectral characteristics of emitted light and a color filter provided with a plurality of coloring portions. Among the plurality of peak wavelengths in the spectral characteristics of the apparatus, the intensity of the peak wavelength at the center is lower than the intensity of other peak wavelengths.
More specifically, the lighting device has a peak wavelength of three colors in spectral characteristics, and a colored portion of four colors is provided in the color filter, and among the peak wavelengths of three colors in the spectral characteristics of the lighting device, The intensity of the peak wavelength located in the center is lower than the intensity of other peak wavelengths.
Moreover, it is preferable that the said color filter has a colored part of 4 colors, R (red), G (green), B (blue), and C (cyan).
Moreover, it is preferable that the said color filter has a colored part of five colors, R (red), G (green), B (blue), C (cyan), and Y (yellow).
More specifically, in the spectral characteristics of the illumination device, the peak wavelengths of the three colors are composed of three colors of R (red), G (green), and B (blue), and the peak of the G (green) The intensity of the wavelength is lower than the intensity of the peak wavelengths of R (red) and B (green).

  In addition to R (red), G (green), and B (blue) that are the three primary colors of the color filter, the colored portion of C (cyan) that is the fourth color and Y (yellow) that is the fifth color In general, the wavelength due to the spectral characteristics of C (cyan) and Y (yellow) is close to the wavelength of G (green). Then, the spectral characteristics of the emitted light has the peak wavelengths of R (red), G (green), and B (blue), which are the three primary colors, and the illumination device in which the intensities of the respective peak wavelengths are substantially the same is described above. When combined with a color filter, as described above, the wavelength of C (cyan) provided in the color filter is close to the peak wavelength of G (green) of the illumination device. Therefore, as the spectral characteristics of the obtained color filter, the intensity in the wavelength region from G (green) to C (cyan) is more than twice the intensity of the peak wavelength of B (blue). As a result, when a color filter having three colored portions R (red), G (green), and B (blue) was originally used, the color filter was able to be reproduced even though it was possible to reproduce white. Since the fourth C (cyan) or the fifth Y (yellow) is provided, the color is changed during white display.

  According to the above configuration, since the illumination device in which the intensity of the peak wavelength of G (green) is lower than the intensity of the peak wavelengths of R (red) and B (blue) is used, the color filter C (cyan) is colored. The light intensity passing through the portion can be reduced, and the light intensity passing through the G (green) colored portion can also be reduced. As a result, the intensity of the wavelength region from C (cyan) to G (green) can be reduced to about ½ or less, and not only can the coloration during white display be prevented, but also a four-color color filter. Can be used to achieve wide color gamut color reproducibility.

Alternatively, in the spectral characteristics of the illumination device, the intensity of the peak wavelength of G (green) is preferably approximately ½ or less of the intensity of the peak wavelength of B (blue).
Furthermore, in the spectral characteristics of the illumination device, the intensity of the color filter corresponding to the C (cyan) peak wavelength of the color filter is approximately 1 of the intensity of the G (green) peak wavelength of the illumination device. / 4 or more is also preferable.

  In this way, the intensity of the peak wavelength of G (green) is set to ½ or less of the intensity of the peak wavelength of B (blue), so that the light is emitted from the illumination device that passes through the colored portion of C (cyan) of the color filter. The intensity of the peak wavelength of G (green) can be reduced. Thereby, coloring at the time of white display can be prevented. Further, the intensity of the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is set to about 1/4 or more of the intensity of the peak wavelength of G (green). A certain light intensity that passes through the C (cyan) colored part can be ensured, and a wide color gamut is achieved without sacrificing the color reproducibility of the C (cyan) color filter. can do. Details will be described in an embodiment described later.

  According to another aspect of the present invention, the electro-optical device is provided. According to such a configuration, it is possible to prevent coloring during white display, and it is possible to realize color reproduction in a wide color gamut.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used in the following description, the scale is appropriately changed for each layer and each member so that each layer and each member can be recognized.

[First Embodiment]
The schematic configuration of the liquid crystal display device (electro-optical device) in the present embodiment will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view schematically showing the configuration of the liquid crystal display device 68. The liquid crystal display device 68 shown in FIG. 1 is an active matrix type liquid crystal display device 68 using a thin film diode (hereinafter referred to as TFD) as a switching element. Note that an active matrix liquid crystal display device or a passive matrix liquid crystal display device other than the above can also be applied to this embodiment.

  As shown in FIG. 1, in the liquid crystal display device 68, an array substrate 54 and a color filter substrate 64 disposed opposite to the substrate are bonded together by a sealing material, and liquid crystal (in a region partitioned by the sealing material ( (Not shown) is enclosed and held. A polarizing plate 52 and a polarizing plate 66 are disposed outside the array substrate 54 and the color filter substrate 64, and a backlight 50 a is disposed outside the polarizing plate 52. Note that nematic liquid crystal or the like is adopted as the liquid crystal, and a twisted nematic (TN) mode is adopted as an operation mode of the liquid crystal display device 68.

  On the color filter substrate 64 side (inner side) facing the array substrate 54, a plurality of scanning lines and a plurality of data lines are formed to intersect in a matrix, and switching is performed at the intersections of the scanning lines and the data lines. An element TFD is formed. The TFD is connected to the pixel electrode. As described above, the pixel 56 includes a TFD that is a switching element and a pixel electrode connected to the TFD. Further, one pixel 56 includes four sub-pixels corresponding to each of four colors R (red), G (green), B (blue), and C (cyan) colored on the color filter substrate 64. .

  FIG. 2 is a cross-sectional view showing a schematic configuration of the color filter of the liquid crystal display device 68 in the present embodiment. As shown in FIG. 2, on the array substrate 54 side (inside) on the color filter substrate 64, a black matrix 72 is formed in a frame shape in order to prevent light leakage from adjacent pixel regions. A color filter 74 is formed in the area partitioned by the black matrix 72. The color filter 74 is composed of pigments of four colors of coloring portions 62R (red), 62G (green), 62B (blue), and 62C (cyan), and is formed so as to correspond to the sub-pixels described above. Further, a protective film is formed on the color filter substrate 64 to prevent flattening and leakage of pigments, and a transparent common electrode 60 (ITO; Indium Tin Oxide) is formed on the protective film. Has been.

  FIG. 3 is a diagram showing the spectral characteristics of the color filter 74. As shown in FIG. 3, the spectral characteristics of the color filter 74 are as follows: B (blue) near 445 nm, C (cyan) near 505 nm, G (green) near 550 nm, and R (red) near 700 nm. It has a peak wavelength. The transmittances of the respective peak wavelengths are 52% for B (blue), 70% for C (cyan), 75% for G (green), and 92% for Y (yellow). In FIG. 4, a color filter 74 having a low B (blue) transmittance is used. 3 represents the spectral characteristics of the wavelength (nm) of light emitted from the backlight 50a, and the Y axis represents the transmittance with which the light emitted from the backlight 50a passes through the backlight 50a. (%). Further, the arrangement order of the colored portions of the color filter 74 is arranged in the order of R (red), G (green), B (blue), and C (cyan) in FIG. It is also preferable to make it.

  Further, polarizing plates 52 and 66 are respectively arranged outside the array substrate 54 and the color filter substrate 64, and the polarization axis formed on the polarizing plate 52 is orthogonal to the polarization axis formed on the color filter substrate 64. Are arranged.

A backlight 50a is disposed outside the polarizing plate 52 on the array substrate 54 side. FIG. 4A is a diagram illustrating a schematic configuration of the backlight 50a in the present embodiment, and FIG. 4B is a cross-sectional view taken along line BB in FIG. 4A.
As shown in FIG. 4A, the backlight 50a includes an RGB color LED 30 that is a light source, a diffusion sheet 36 that diffuses the light emitted from the RGB color LED 30, and a surface that emits the diffused and incident light as a surface light. The light guide plate 32 is provided.

In the present embodiment, the RGB LED 30 used as the light source of the backlight 50a has R (red), G (green), and B (blue) LEDs mounted in one package, and each of these colors emits light. As a result, white light is emitted. As shown in FIG. 5A, the spectral characteristics of the backlight 50a have peak wavelengths of B (blue) near 460 nm, G (green) near 540 nm, and R (red) near 640 nm from the short wave side. doing. In addition, it is also preferable that the LEDs 30 of R (red), G (green), and B (blue) are mounted in separate packages to constitute one LED 30. A plurality of such RGB LEDs 30 are arranged in a row adjacent to each other with the light emitting surfaces facing the diffusion sheet 36 and the planar light guide plate 32. In FIG. 4A, the RGB color LEDs 30 are arranged separately from each other, but it is also preferable that the RGB color LEDs 30 are arranged in contact with each other.
In this way, by using RGB color LEDs as the light source, it is possible to use each of the RGB emission colors as they are without using a phosphor as in the case of a white LED, near-ultraviolet LED, etc., so that there are three primary colors. Peak wavelengths of R (red), G (green) and B (blue) can be obtained. In addition, since RGB LEDs are equipped with R (red), G (green), and B (blue) LEDs, the intensity of each peak wavelength can be controlled.

  The diffusion sheet 36 is made of, for example, an acrylic resin, and is disposed on the light emitting surface side of the RGB color LED 30. The cross-sectional shape of the diffusion sheet 36 is formed in a sawtooth shape, and the light emitted from the RGB LEDs 30 is scattered and diffused in the thickness direction of the planar light guide plate 32, and the light is uniformly emitted to the planar light guide plate 32. It is like that. The RGB color LEDs 30 are also preferably arranged so as to contact the diffusion sheet 36.

  The planar light guide plate 32 is disposed on the light emitting surface side of the RGB color LED 30 via a diffusion sheet 36. The planar light guide plate 32 is made of, for example, a transparent acrylic resin, and the light emitted from the RGB LEDs 30 is incident from the side surface of the planar light guide plate 32 and is entirely formed by the acrylic plate inside the planar light guide plate 32. It goes straight ahead with repeated reflections. A plurality of grooves are formed on the lower main surface of the planar light guide plate 32. The plurality of grooves are formed by providing a plurality of fine inclined surfaces on the lower main surface of the planar light guide plate 32. In addition, the groove formed in the planar light guide plate 32 is rough in a region far from the incident end surface of the RGB LED 30 in order to emit light uniformly from the planar light guide plate 32. When formed, they are formed densely. It is possible to emit uniform light from the planar light guide plate 32 by changing the incident angle of the light emitted from the RGB color LEDs 30 by the grooves. Instead of forming the plurality of grooves in the planar light guide plate 32, a plurality of reflective dots are formed, and the incident angle of the light emitted from the RGB LEDs 30 is changed to make the planar light guide plate 32 uniform. It is also preferable to emit light. Further, it is preferable to dispose the above-described diffusion sheet or the like on the upper surface of the planar light guide plate 32. In this way, the light emitted from the RGB LED 30 can be emitted by the surface light guide plate 32 and emitted toward the viewer.

  The reflector 38 is formed so as to cover the RGB color LEDs 30 and the diffusion sheet 36. That is, the cross section of the reflector 38 is formed in a U-shape, and the RGB LED 30 is disposed inside the reflector 38. With such a structure, the reflector 38 can reflect the light emitted from the RGB LED 30 as a light source inside the reflector 38 and guide it in the direction of the planar light guide plate 32.

  Thus, the light irradiated from the backlight 50 a is converted into linearly polarized light along the polarization axis of the incident side polarizing plate 52 and enters the liquid crystal layer from the array substrate 54. This linearly polarized light is rotated by a predetermined angle along the twist direction of the liquid crystal molecules in the process of transmitting the liquid crystal in the state where no electric field is applied, and is transmitted through the output side polarizing plate 66. Thereby, white display is performed when no electric field is applied (normally white mode). On the other hand, when an electric field is applied to the liquid crystal, the linearly polarized light incident on the liquid crystal does not rotate and therefore does not pass through the output side polarizing plate 66. Thereby, black display is performed when no electric field is applied. Note that gradation display can also be performed depending on the strength of an applied electric field.

As described above, in this embodiment, the color filter 74 having four colored portions of R (red), G (green), B (blue), and C (cyan) is used. The backlight 50a has peak wavelengths in the order of B (blue), G (green), and R (red) from the short wave side, and the backlights 50a are used in which the intensities of the respective peak wavelengths substantially coincide.
As described above, when the intensities of the three peak wavelengths emitted from the black light 50a match, the liquid crystal display device 68 is colored in the white display as described in the background art. That is, the wavelength of the colored portion C (cyan) provided in the color filter 74 is close to the wavelength of G (green). Therefore, the spectral characteristic of the color filter 74 is that the intensity of the G (green) wavelength region to the C (cyan) wavelength region is more than doubled due to the G (green) peak wavelength emitted from the backlight 50a. Colors appear when displaying white. In the present embodiment, the intensity of the peak wavelength of the backlight 50a having the above spectral characteristics is controlled as follows in order to avoid coloring in the case of white display. Here, the reference white color is expressed by an additive color mixture of R (red), G (green), and B (blue), and the color temperature at this time is set to 6500K. Therefore, the backlight 50a is controlled so that the color temperature is 6500K.

  Specifically, by controlling the intensity of the peak wavelength of B (blue) emitted from the backlight 50a, the white temperature of the above condition can be 6500K. About the control method of the intensity | strength of the peak wavelength of G (green), the intensity | strength of the peak wavelength of the light inject | emitted from each LED30 is controllable by adjusting the current limiting resistance connected to each LED30. In the present embodiment, when the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue), a current limiting resistor connected to the LED 30 of G (green) Is made larger than other current limiting resistors, thereby reducing the luminance emitted from the G (green) LED 30, that is, the intensity of the peak wavelength. In this manner, the intensity of the peak wavelength of the light emitted from the G (green) LED 30 can be controlled to ½ or less of the intensity of the peak wavelength of the light emitted from the B (blue) LED 30. . In addition, description about the circuit etc. which drive said LED30 grade | etc., Is abbreviate | omitted in this Embodiment. The intensity of the peak wavelength of the light emitted from the G (green) LED 30 is preferably set to 1/5 or more of the intensity of the peak wavelength of the light emitted from the B (blue) LED 30.

  FIG. 5A shows mainly the R (red), G (green), and B (blue) LEDs 30 constituting the RGB color LED 30 in order to achieve white display (color temperature 6500K) as the reference. It is a figure which shows the spectral characteristic at the time of controlling the intensity | strength of the peak wavelength of LED30 of G (green). As shown in FIG. 5A, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). Specifically, as shown in Table 1, when the intensity of the peak wavelength of B (blue) is 1, the intensity ratio of the peak wavelength of G (green) of the backlight 50a (hereinafter referred to as intensity ratio 1). Is 0.281. Thus, when the backlight 50a is set to 6500K which is the white color temperature, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). . The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue).

  Further, as described above, when the intensity of the peak wavelength of the G (green) LED 30 is controlled, as shown in FIG. 5A, the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is supported. The intensity of the backlight 50a is about 1/4 or more of the intensity of the peak wavelength of G (green). More specifically, as shown in Table 1 above, when the intensity of the peak wavelength of G (green) is 1, the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is shown. The intensity ratio at (hereinafter referred to as intensity ratio 2) is 0.379. In this way, a constant light intensity passing through the C (cyan) colored portion 62C of the color filter 74 can be ensured, and the color reproducibility by the C (cyan) color filter 74 can be increased without sacrificing color. Color gamut reproducibility can be realized.

  Subsequently, the backlight 50a is controlled so as to have a white color temperature of 6500K by using the backlight 50b having characteristics different from the spectral characteristics of the backlight 50a. As shown in FIG. 5B, the spectral characteristics of the backlight 50b have peak wavelengths of B (blue) near 445 nm, G (green) near 530 nm, and R (red) near 645 nm from the short wave side. ing. Using the backlight 50b having such characteristics, the peak wavelength intensity of the G (green) LED 30 was controlled in order to obtain the reference white color by the same method as described above, and FIG. As shown in Table 1, the intensity ratio 1 is 0.302, and the intensity of the peak wavelength of G (green) is about ½ or less of the intensity of the peak wavelength of B (blue). The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue). Further, the intensity ratio 2 is 0.629, and the intensity at the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is about 1/4 of the intensity of the peak wavelength of G (green). That's it.

  As described above, according to the present embodiment, the backlight 50 is used in which the intensity of the peak wavelength of G (green) is lower than the intensity of the peak wavelengths of R (red) and B (green). The light intensity passing through the C (cyan) colored portion 62C can be reduced, and the light intensity passing through the G (green) colored portion 62G can also be reduced. As a result, the intensity in the wavelength region from C (cyan) to G (green) can be reduced to ½ or less, and it is possible not only to prevent coloring during white display, but also to the four color filters 74. The color reproducibility of the wide color gamut using the can be realized.

[Second Embodiment]
In the first embodiment, the color filter 74 is composed of pigments of four colors of coloring portions 62R (red), 62G (green), 62B (blue), and 62C (cyan), and the like, and this 62B (blue). The transmittance of the peak wavelength of B (blue) at 52 is 52%, and the color filter 74 having a low transmittance was used. On the other hand, in the present embodiment, the transmittance of the peak wavelength of B (blue) in the colored portion 62B is changed from 52% to 72% by replacing the pigment constituting the colored portion of the color filter 74. It is different in that it is improved. Thus, even when the transmittance of the colored portion 62B of the color filter 74 is changed in order to obtain the reference white color, the above relationship, that is, the intensity of the peak wavelength of G (green) is B (blue). The relationship is established that the intensity of the peak wavelength of ½ or less and the intensity of the peak wavelength of C (cyan) is ¼ or more of the intensity of the peak wavelength of G (green). Hereinafter, configurations and the like different from those of the first embodiment will be described, and description of similar configurations and the like will be omitted.

  FIG. 6 is a diagram showing the spectral characteristics of the color filter 74. As shown in FIG. 6, the spectral characteristics of the color filter 74 are as follows: B (blue) near 460 nm, C (cyan) near 505 nm, G (green) near 550 nm, and R (red) near 700 nm. It has a peak wavelength. The transmittance of each peak wavelength is 72% for B (blue), 70% for C (cyan), 75% for G (green), and 92% for Y (yellow). Compared with the embodiment, a color filter 74 having a higher transmittance of the wavelength of B (blue) is used. 6 represents the wavelength (nm) of the spectral characteristics of the light emitted from the backlight 50a, and the Y axis represents the transmittance with which the light emitted from the backlight 50a passes through the backlight 50a. (%).

  As described in the first embodiment, in this embodiment, the reference white color temperature is 6500K. Therefore, the intensity of the peak wavelength emitted from the backlight 50a is controlled in consideration of the wavelength transmittance of the color filter 74 so that the temperature of the light emitted from the color filter 74 is 6500K. In the present embodiment, the same backlight 50a used in the first embodiment is used.

  FIG. 7A shows mainly the R (red), G (green), and B (blue) LEDs 30 constituting the RGB color LED 30 in order to achieve the above-described white display (color temperature 6500K). It is a figure which shows the spectral characteristic at the time of controlling the intensity | strength of the peak wavelength of LED30 of G (green). As shown in FIG. 7A, the spectral characteristics of the backlight 50a have peak wavelengths of B (blue) near 460 nm, G (green) near 540 nm, and R (red) near 640 nm from the short wave side. doing.

  As shown in FIG. 7A, when the transmittance of the wavelength of B (blue) that passes through the colored portion 62B of the color filter 74 is improved from 52% to 72%, B emitted from the backlight 50a. The intensity of the (blue) peak wavelength is low, and the intensity of the G (green) peak wavelength is also lower than that of the first embodiment. Further, as shown in FIG. 7A, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). Specifically, as shown in Table 2, the intensity ratio 1 is 0.432. Thus, even when the transmittance of the colored portion 62B of the color filter 74 is changed, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). The relationship is established. The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue).

  Further, as described above, when the intensity of the peak wavelength of the G (green) LED 30 is controlled, as shown in FIG. 7A, the peak wavelength of the cyan (C) coloring portion 62C of the color filter 74 is supported. The intensity of the backlight 50a is about 1/4 or more of the intensity of the peak wavelength of G (green). Specifically, as shown in Table 2 above, the intensity ratio 2 is 0.313. Thus, even when the transmittance of the colored portion 62B of the color filter 74 is changed, the intensity at the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is G (green). ) Is about 1/4 or more of the peak wavelength intensity.

  Subsequently, the intensity of the peak wavelength of the G (green) LED 30 is controlled using the backlight 50b having characteristics different from the spectral characteristics of the backlight 50a. The spectral characteristics of the backlight 50b are the same as those used in the first embodiment. Using the backlight 50b having such characteristics, the peak wavelength intensity of the G (green) LED 30 was controlled in order to obtain the reference white color by the same method as described above. As shown in Table 2, the intensity ratio 1 is 0.432, and the intensity of the peak wavelength of G (green) is about ½ or less of the intensity of the peak wavelength of B (blue). The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue). Further, the intensity ratio 2 is 0.613, and the intensity at the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is about 1/4 or more of the intensity of the peak wavelength of G (green). It has become.

[Third Embodiment]
In the first and second embodiments, the color filter 74 is composed of four colors of the coloring portion 62R (red), 62G (green), 62B (blue), and 62C (cyan). It was. On the other hand, in the present embodiment, a case where a color filter 74 provided with a fifth Y (yellow) colored portion (not shown) in addition to the above four colored portions is described below. To do. Note that the description of the same configuration as the first embodiment is omitted.

  FIG. 8 is a diagram showing the spectral characteristics of the color filter 74. As shown in FIG. 8, the spectral characteristics of the color filter 74 are B (blue) near 445 nm, C (cyan) near 505 nm, G (green) near 525 nm, Y (yellow) near 575 nm and The peak wavelength of R (red) is around 700 nm. The transmittance at each peak wavelength is 52% for B (blue), 70% for C (cyan), 84% for G (green), 70% for Y (yellow), and 92 for Y (yellow). In this embodiment, the color filter 74 having a low B (blue) transmittance is used. 8 represents the wavelength (nm) of the spectral characteristics of the light emitted from the backlight 50, and the Y axis represents the transmittance with which the light emitted from the backlight 50a passes through the backlight 50. (%).

  In the present embodiment, the above-described backlight 50a is used. The spectral characteristics of the backlight 50a also have three peak wavelengths with substantially the same intensity as the spectral characteristics shown in FIG. Under these conditions, among the R (red), G (green) and B (blue) LEDs constituting the RGB color LED 30 so that the white color temperature emitted from the backlight 50a is 6500K, mainly The intensity of the peak wavelength of the G (green) LED 30 is controlled.

FIG. 9A is a diagram showing the spectral characteristics when the LED 30 constituting the backlight 50a is controlled so that the backlight 50a becomes the reference white color. As shown in FIG. 5A, the spectral characteristics of the backlight 50a have peak wavelengths of B (blue) near 460 nm, G (green) near 540 nm, and R (red) near 640 nm from the short wave side. doing.
As shown in FIG. 9A, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). Specifically, as shown in Table 3, the intensity ratio 1 is 0.233. Thus, when the backlight 50a is set to 6500K which is the white color temperature, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). . The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue).

  Further, as described above, when the intensity of the peak wavelength of the G (green) LED 30 is controlled, as shown in FIG. 9A, the peak wavelength of the cyan (C) coloring portion 62C of the color filter 74 is supported. The intensity of the backlight 50a is about 1/4 or more of the intensity of the peak wavelength of G (green). Specifically, as shown in Table 3 above, the intensity ratio 2 is 0.446. In this way, the intensity of the peak wavelength of G (green) is controlled so that the intensity of the peak wavelength of C (cyan) is about ¼ or more of the intensity of the peak wavelength of G (green). It is possible to avoid sacrificing the color reproducibility of 74 C (cyan).

Subsequently, the intensity of the peak wavelength of the G (green) LED 30 is controlled using the backlight 50b having characteristics different from the spectral characteristics of the backlight 50a. The backlight 50b uses the backlight a used in the first embodiment. As shown in FIG. 9B, the spectral characteristics of the backlight 50b have peak wavelengths of B (blue) near 445 nm, G (green) near 530 nm, and R (red) near 645 nm from the short wave side. doing. Using the backlight 50b having such characteristics, the peak wavelength intensity of the G (green) LED 30 was controlled in order to obtain the reference white color by the same method as described above. As shown in Table 3, the intensity ratio 1 is 0.259, and the intensity of the peak wavelength of G (green) is about ½ or less of the intensity of the peak wavelength of B (blue). The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue). Further, the intensity ratio 2 is 0.643, and the intensity at the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is about 1/4 of the intensity of the peak wavelength of G (green). That's it.
[Fourth Embodiment]
In the third embodiment, the color filter 74 is composed of pigments of five colors such as the coloring portions 62R (red), 62G (green), 62B (blue), 62C (cyan), and Y (yellow), and the like. The transmittance at the peak wavelength of B (blue) in this colored portion 62B (blue) is 52%, and the color filter 74 having a low transmittance at the wavelength of B (blue) is used. On the other hand, in this embodiment, the transmittance of the peak wavelength of B (blue) in the colored portion 62B is changed from 52% to 72% by replacing the pigment constituting the color of the color filter 74. It differs in that it is improved. As described above, even when the transmittance of the colored portion 62B of the color filter 74 is changed, the above relationship, that is, the intensity of the peak wavelength of G (green) is 1 / of the intensity of the peak wavelength of B (blue). 2 or less, the relationship that the intensity of the peak wavelength of C (cyan) is ¼ or more of the intensity of the peak wavelength of G (green) is established. In the following, different configurations and the like from the third embodiment will be described, and description of similar configurations and the like will be omitted.

  FIG. 10 is a diagram showing the spectral characteristics of the color filter 74. As shown in FIG. 10, the spectral characteristics of the color filter 74 are B (blue) near 460 nm, C (cyan) near 505 nm, G (green) near 525 nm, Y (yellow) near 575 nm and The peak wavelength of R (red) is around 700 nm. The transmittance at each peak wavelength is 72% for B (blue), 70% for C (cyan), 84% for G (green), 70% for Y (yellow), and 92 for Y (yellow). In this embodiment, the color filter 74 having a low B (blue) transmittance is used. 10 represents the wavelength (nm) of the spectral characteristics of the light emitted from the backlight 50a, and the Y axis represents the transmittance through which the light emitted from the backlight 50a passes through the backlight 50. (%).

  As described in the second embodiment, the reference white color temperature is 6500K in the present embodiment. Therefore, the intensity of the peak wavelength emitted from the backlight 50a is controlled in consideration of the wavelength transmittance of the color filter 74 so that the temperature of light emitted from the color filter 74 is 6500K. In the present embodiment, the same backlight 50a used in the first embodiment is used.

  FIG. 11A shows mainly the R (red), G (green), and B (blue) LEDs 30 constituting the RGB color LED 30 in order to achieve white display (color temperature 6500K) as the reference. It is a figure which shows the spectral characteristic at the time of controlling the intensity | strength of the peak wavelength of LED30 of G (green). As shown in FIG. 11A, the spectral characteristics of the backlight 50a have peak wavelengths of B (blue) near 460 nm, G (green) near 540 nm, and R (red) near 640 nm from the short wave side. doing.

  As shown in FIG. 11A, when the transmittance of the B (blue) wavelength of the colored portion 62B of the color filter 74 is improved from 52% to 72%, the B (emitted from the backlight 50a) The intensity of the peak wavelength of blue) is lower than that of the third embodiment, and the intensity of the peak wavelength of G (green) is also lower than that of the third embodiment. . Further, as shown in FIG. 11A, the intensity of the peak wavelength of G (green) is ½ or less of the intensity of the peak wavelength of B (blue). Specifically, as shown in Table 4, the intensity ratio 1 is 0.302. Thus, even when the transmittance of the B (blue) wavelength of the coloring portion 62B of the color filter 74 is changed, the intensity of the peak wavelength of G (green) is the intensity of the peak wavelength of B (blue). The relationship of 1/2 or less is established. The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue).

  Further, as described above, when the intensity of the peak wavelength of the G (green) LED 30 is controlled, as shown in FIG. 11B, it corresponds to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74. The intensity of the backlight 50a is about 1/4 or more of the intensity of the peak wavelength of G (green). Specifically, as shown in Table 4 above, the intensity ratio 2 is 0.361. Thus, even when the transmittance of the B (blue) wavelength of the coloring portion 62B of the color filter 74 is changed, the backlight 50a corresponding to the peak wavelength of the cyan (C) coloring portion 62C of the color filter 74 is used. Is established to be about 1/4 or more of the intensity of the peak wavelength of G (green).

  Subsequently, the intensity of the peak wavelength of the G (green) LED 30 is controlled using the backlight 50b having characteristics different from the spectral characteristics of the backlight 50a. The spectral characteristics of the backlight 50b have peak wavelengths of B (blue) near 445 nm, G (green) near 530 nm, and R (red) near 645 nm as shown in FIG. 11B. ing. Using the backlight 50b having such characteristics, the peak wavelength intensity of the G (green) LED 30 was controlled in order to obtain the reference white color by the same method as described above. As shown in Table 4, the intensity ratio 1 is 0.324, and the intensity of the peak wavelength of G (green) is about ½ or less of the intensity of the peak wavelength of B (blue). The intensity of the peak wavelength of G (green) is 1/5 or more of the intensity of the peak wavelength of B (blue). Further, the intensity ratio 2 is 0.631, and the intensity at the backlight 50a corresponding to the peak wavelength of the cyan (C) colored portion 62C of the color filter 74 is about 1/4 or more of the intensity of the peak wavelength of G (green). It has become.

[Electronics]
Next, an example of an electronic device including the above-described liquid crystal display device 68 will be described with reference to FIG. FIG. 12 is a perspective view of a mobile phone. The liquid crystal display device 68 described above is mounted inside the casing of the mobile phone 300.

  Note that the above-described liquid crystal display device 68 can be applied to various electronic devices other than mobile phones. For example, PDA (Personal Digital Assistant), liquid crystal projector, multimedia personal computer (PC) and engineering workstation (EWS), pager, word processor, TV, viewfinder type or monitor direct view type video tape recorder, electronic notebook It can be applied to electronic devices such as an electronic desk calculator, a car navigation device, a POS terminal, and a device having a touch panel.

      It should be noted that the technical scope of the present invention is not limited to the above-described embodiment, and includes those in which various modifications are made to the above-described embodiment without departing from the spirit of the present invention.

1 is an exploded perspective view schematically showing a schematic configuration of a liquid crystal display device according to the present invention. It is a figure which shows schematic structure of the color filter of FIG. It is a figure which shows the spectral characteristic of the same 4 color filter. It is a figure which shows schematic structure of a backlight same as the above. It is a figure at the time of controlling the intensity | strength of a backlight same as the above. It is a figure which shows the spectral characteristic of the same 4 color filter. It is a figure at the time of controlling the intensity | strength of a backlight same as the above. It is a figure which shows the spectral characteristic of the same 5 color filter. It is a figure at the time of controlling the intensity | strength of a backlight same as the above. It is a figure which shows the spectral characteristic of the same 5 color filter. It is a figure at the time of controlling the intensity | strength of a backlight similarly. It is a schematic block diagram of one Embodiment of the electronic device of this invention.

Explanation of symbols

50a ... Backlight (illumination device), 62R, 62G, 62B, 62C ... Colored part,
74 ... color filter, 68 ... liquid crystal display device (electro-optical device)

Claims (8)

An electro-optical device comprising an illumination device having a plurality of peak wavelengths in the spectral characteristics of emitted light, and a color filter provided with a plurality of colored portions,
Of the plurality of peak wavelengths in the spectral characteristics of the illuminating device, the intensity of the substantially central peak wavelength is lower than the intensity of the other peak wavelengths.   The lighting device has a peak wavelength of three colors in spectral characteristics, a colored portion of four colors is provided in the color filter, and a peak wavelength located in the center among the peak wavelengths of three colors in the spectral characteristics of the lighting device The electro-optical device according to claim 1, wherein the intensity of is lower than the intensity of other peak wavelengths.   3. The electro-optical device according to claim 1, wherein the color filter has colored portions of four colors of R (red), G (green), B (blue), and C (cyan). . The color filters are R (red), G (green), B (blue), C (cyan) and Y (yellow).
The electro-optical device according to claim 1, further comprising:   In the spectral characteristics of the illumination device, the peak wavelengths of the three colors are composed of three colors of R (red), G (green), and B (blue), and the intensity of the peak wavelength of G (green) is R ( 5. The electro-optical device according to claim 1, wherein the electro-optical device is lower than the intensity of the peak wavelengths of red and B (green).   The intensity of the peak wavelength of the G (green) in the spectral characteristics of the illumination device is approximately ½ or less of the intensity of the peak wavelength of the B (blue). 2. The electro-optical device according to item 1.   In the spectral characteristics of the illumination device, the intensity of the color filter corresponding to the peak wavelength of C (cyan) in the illumination device is approximately ¼ or more of the intensity of the peak wavelength of G (green) of the illumination device. The electro-optical device according to claim 1, wherein:   An electronic apparatus comprising the electro-optical device according to claim 1.

Images