JP2003233063A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a translucent liquid crystal display device having depth of displayed colors both in a reflective mode and a transmissive mode at the level nearly equal with each other. <P>SOLUTION: Transparent regions 20a, 20b, 20c are formed on a reflection region r of color filters 2a, 2b, 2c. In the reflective mode a part of external light passes through the transparent regions 20a, 20b, 20c. As a result, brightness in the reflective mode is enhanced and the depth of the displayed colors in the transmissive and reflective modes are made to be at the level nearly equal with each other. Among a plurality of color filters, areas of respective transmission regions are identical to each other. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transflective liquid crystal display device capable of displaying in a reflective mode and in a transmissive mode.

[0002]

2. Description of the Related Art Conventionally, in a monochrome liquid crystal display device,
A reflective liquid crystal that utilizes external light and a liquid crystal with a backlight that uses a semi-transmissive reflective film that has a property of partially reflecting and transmitting light are widely used.

On the other hand, conventionally, a transmissive liquid crystal utilizing a backlight has been widely used in a color liquid crystal display device.

In recent years, in color liquid crystal display devices, mainly a portable type, a reflection type liquid crystal utilizing external light has been increasingly used.

Generally, in a color liquid crystal display device, for example, a color filter that transmits red (red) light, Gr,
Blue, a color filter that transmits een (green) light
Three color filters called a color filter that transmits (blue) light are arranged side by side within one pixel.

Therefore, in the color liquid crystal display device, the light transmission amount is one-third of that in the monochrome liquid crystal display device.

Therefore, the color liquid crystal display device requires a device structure having higher transmittance and reflectance than the monochrome liquid crystal display device.

Further, the color liquid crystal display device needs a structure for improving coloring and contrast reduction due to the semi-transmissive reflective film, which is not a serious problem in the monochrome liquid crystal display device.

Therefore, in recent years, a color liquid crystal display device (semi-transmissive liquid crystal display device) which does not use a semi-transmissive reflective film which has been conventionally used has appeared.

FIG. 12 is a sectional view of a conventional transflective liquid crystal display device. As shown in FIG. 12, this conventional transflective liquid crystal display device has a backlight 55 as a first layer, a polarizing plate 54 as a second layer, a reflector 53 as a third layer, and a liquid crystal as a fourth layer. The layer 52, the color filter layer 51 on the fifth layer, and the sixth layer
The polarizing plate 50 is provided on the layer. In addition, in FIG.
The semi-transmissive liquid crystal display device corresponding to one pixel is shown.

This semi-transmissive liquid crystal display device has a reflective area r for displaying in the reflective mode and a transmissive area t for displaying in the transmissive mode.

An opening 56 is formed in the transmissive area t of the reflecting plate 53 that totally reflects the light.

With this configuration, the display in the reflection mode is brightened and the visibility of the display in the transmission mode is improved.

As described above, the opening 5 is formed in a part of the reflection plate 53.
As another example of the semi-transmissive liquid crystal display device in which 6 is provided to brighten the display in the reflective mode and improve the visibility of the display in the transmissive mode, for example, the semi-transmissive liquid crystal disclosed in Japanese Patent Laid-Open No. 11-52366. There is a display device (hereinafter, referred to as “first conventional technology”).

However, the semi-transmissive liquid crystal display device shown in FIG. 12 and the first conventional technique have the following problems in the reflection mode.

That is, since the light passes through the color filter layer 51 twice before being reflected by the reflector 53 and going forward, the absorption of light is larger than in the transmission mode.

Therefore, the displayed color density differs between the reflection mode and the transmission mode, and there is a problem in color reproducibility.

In order to solve this problem, there is the following conventional transflective liquid crystal display device.

For example, a semi-transmissive liquid crystal display device disclosed in Japanese Patent Laid-Open No. 2000-267077 (hereinafter referred to as "second
Prior art ". In (), the first color filter and the second color filter are arranged and formed with the reflective layer having the slit interposed therebetween.

Further, for example, Japanese Patent Laid-Open No. 2000-29827.
The semi-transmissive liquid crystal display device disclosed in Japanese Patent No.
This is called "third prior art". In (), the thickness of the color filter layer in the reflection area is set to ½ of that in the transmission area.

Further, for example, Japanese Patent Laid-Open No. 11-183892.
Semi-transmissive liquid crystal display device (hereinafter,
This is called "fourth conventional technology". In (), a reflector having an area smaller than that of the semi-transmissive reflector is provided on the semi-transmissive reflector, and a color filter is further provided thereon.

Then, an opening is provided in the color filter in the area facing the reflection plate to improve the brightness of the reflection mode.

[0023]

However, in the second conventional technique, the color filter is required twice as much as the conventional semi-transmissive liquid crystal display device of FIG. 12, and there is a problem in cost and manufacturing method. .

Further, it is generally considered difficult to finely control the thickness of the color filter layer as in the third conventional technique.

Further, in the fourth prior art, two reflecting plates, that is, a semi-transmissive reflecting plate and a reflecting plate are required, and since the part of the color filter through which the light passes uses the semi-transmissive reflecting plate. The conventional problems of coloring and contrast reduction due to the semi-transmissive reflector cannot be solved.

The conventional semi-transmissive liquid crystal display device has the following problem from a viewpoint different from the above.

The spectral characteristic of the backlight and the spectral characteristic of general external light such as daylight are greatly different.

The all-transmissive liquid crystal display device is designed to have good color reproducibility by combining a backlight and a color filter.

However, in the conventional transflective liquid crystal display device,
Since the difference between the backlight and general external light is not taken into consideration, there arises a problem that the hues of colors displayed in the transmissive mode and the reflective mode are different.

In the method of using two color filters as in the second prior art and the method of reducing the thickness of the color filter to half as in the third prior art, the difference in hue is adjusted. Is difficult.

Therefore, according to the present invention, the cost can be reduced as much as possible and the manufacturing can be easily performed.
It is possible to make the color saturation displayed in the reflective mode and the transmissive mode similar, and to adjust the difference in the hue of the color displayed in the transmissive mode and the reflective mode, thereby lowering the color developability and the contrast. An object of the present invention is to provide a semi-transmissive liquid crystal display device.

[0032]

In the liquid crystal display device according to the present invention, the light source provided in the first layer, the first polarizing means provided in the second layer, and the reflection provided in the third layer. Means, a liquid crystal layer provided in the fourth layer, a color filter layer provided in the fifth layer and corresponding to one pixel, and a second polarizing means provided in the sixth layer. The filter layer has a reflective region for displaying in the reflective mode and a transmissive region for displaying in the transmissive mode, the reflecting means has an opening, and the opening is provided with a color filter layer through the liquid crystal layer. The color filter layer is formed in a position facing the transmission region of the color filter layer, and the color filter layer is formed by planarly arranging a plurality of color filters having different wavelength passbands, and each of the plurality of color filters has a portion belonging to the reflection region. Has a part that belongs to the transparent area, Kutomo In one color filter, part of the area of a portion which belongs to the reflection region has a another area larger than the transmittance of the portion belonging to the reflection region.

With this structure, when the external light passes through the color filter in the reflection mode, a part of the external light passes through a part of the region having a large transmittance T.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color intensity can be made almost the same in the reflection mode and the transmission mode.

Further, in the color filter, the surface area of a part of the region having a large transmittance T is adjusted, or a color filter not having a part of the region having a large transmittance T is provided to reflect the light. You can adjust the color balance in the mode.

As a result, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

Further, since the above effect is obtained by the simple structure in which the color filter is provided with a partial region having a large transmittance T, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the transflective liquid crystal display device is constructed without providing the transflective film (semitransmissive reflection plate),
Inconveniences such as coloring and lowering of contrast due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

In the liquid crystal display device according to the present invention, the light source provided in the first layer, the first polarization means provided in the second layer, the reflection means provided in the third layer, and the fourth means. A liquid crystal layer provided in the layer, a color filter layer provided in the fifth layer and forming a pixel region corresponding to one pixel, and a second polarizing means provided in the sixth layer, The color filter layer has a reflective region for displaying in the reflective mode and a transmissive region for displaying in the transmissive mode, the reflecting means has an opening, and the opening is a color filter through the liquid crystal layer. Formed at a position facing the transparent region of the layer,
The color filter layer is formed by planarly arranging a plurality of color filters having different wavelength pass bands, and each of the plurality of color filters has a portion belonging to a reflection region and a portion belonging to a transmission region, and at least In one color filter, a part of the area belonging to the reflective area has a different transmittance from the other areas of the area belonging to the reflective area,
In addition, it has a wavelength pass band in a predetermined range.

With this configuration, the color balance in the reflection mode can be adjusted by adjusting the transmittance T and the wavelength pass band of a part of the area belonging to the reflection area of the color filter.

In the color filter, the surface area of a part of regions having different transmittances T and wavelength passbands in a predetermined range can be adjusted, or different transmittance T and wavelength passbands in a predetermined range can be adjusted. It is also possible to adjust the color balance in the reflection mode by providing a color filter that does not have a part of the area having the colorant.

Since the color balance can be adjusted as described above, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

Further, by adjusting the transmittance T and the wavelength passband of a part of the part belonging to the reflection area of the color filter, the waveform representing the transmittance T of the part can be adjusted.

As a result, the spectral distribution in the reflection mode can be finely controlled. Therefore, as compared with the case where the transmittance T of a part of the area belonging to the reflection area of the color filter is constant in the visible light area and the waveform representing the transmittance T of the area cannot be adjusted. The reflection mode spectral distribution can be made closer to the transmission mode spectral distribution.

As a result, in the reflection mode and the transmission mode,
The color strength can be made similar.

Further, the color filters have different transmittances T
Also, since the above-mentioned effect is obtained with a simple configuration in which a partial region having a wavelength pass band in a predetermined range is provided, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the transflective liquid crystal display device is constructed without providing the transflective film (semitransmissive reflection plate),
Inconveniences such as coloring and lowering of contrast due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

The above-mentioned transmittance T has been described in the embodiment.

[0051]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the liquid crystal display device according to claim 1, the light source provided in the first layer, the first polarizing means provided in the second layer, and the reflecting means provided in the third layer. And a liquid crystal layer provided in the fourth layer, a color filter layer provided in the fifth layer and corresponding to one pixel, and a second polarizing means provided in the sixth layer. The layer has a reflective region for displaying in the reflective mode and a transmissive region for displaying in the transmissive mode, the reflecting means has an opening, and the opening is provided through the liquid crystal layer to the color filter layer. The color filter layer is formed at a position facing the transmission region, and the color filter layer is formed by planarly arranging a plurality of color filters having different wavelength pass regions, and each of the plurality of color filters is formed by transmitting a portion belonging to the reflection region and a transmission region. Has a part belonging to the area, and at least In one color filter, part of the area of a portion which belongs to the reflection region has a another area larger than the transmittance of the portion belonging to the reflection region.

With this structure, when the external light passes through the color filter in the reflection mode, a part of the external light passes through a part of the region having a large transmittance.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color intensity can be made almost the same in the reflection mode and the transmission mode.

Further, in the color filter, by adjusting the surface area of a part of the region having a large transmittance, or by providing a color filter not having a part of the region having a large transmittance, a reflection mode can be obtained. You can adjust the color balance of.

As a result, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

Further, since the above effect is obtained by the simple structure in which the color filter is provided with a part of the region having a large transmittance, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the semi-transmissive liquid crystal display device is constructed without providing the semi-transmissive reflection film (semi-transmissive reflection plate),
Inconveniences such as coloring and lowering of contrast due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

In the liquid crystal display device according to the second aspect, in each of the plurality of and the predetermined number of color filters, a part of the part belonging to the reflective region has a transmittance higher than that of the other part of the part belonging to the reflective region. The surface areas of some regions having a large transmittance are substantially equal between the plurality of and the predetermined number of color filters.

With this structure, it is possible to easily manufacture a plurality of color filters, as compared with a case where the surface areas of some regions having a large transmittance are made different from each other.

Further, by providing a part of the region having a large transmissivity in the plurality of color filters having different wavelength pass bands, the color depth in the reflection mode and the transmission mode is increased in the plurality of color filters. Can be about the same.

In the liquid crystal display device according to the third aspect, in each of the plurality and the predetermined number of color filters, a part of the region belonging to the reflective region has a transmittance higher than that of the other region belonging to the reflective region. The surface area of the partial area having a large transmittance is determined for each color filter.

With this structure, it is possible to adjust the surface area of a part of the region having a large transmittance in each of the plurality of color filters.

Further, only a predetermined number of color filters can be provided with a partial region having a large transmittance, while a color filter not having a partial region having a large transmittance can be provided.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plural and predetermined number of color filters is provided with a part of the region having a large transmittance, only one color filter is provided with a part of the region having a large transmittance to adjust the surface area thereof. Then, the degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance.

According to another aspect of the liquid crystal display device of the present invention, in the color filter, a part of the area belonging to the reflective area has a larger transmissivity than the other area of the part belonging to the reflective area. A plurality of partial areas are provided.

With this configuration, since one color filter is provided with a plurality of partial regions having a large transmittance, the average number of times external light passes through the partial regions having a large transmittance in the reflection mode. Can be converted.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

In the liquid crystal display device according to the fifth aspect, in each of the plurality and the predetermined number of color filters, a part of the area belonging to the reflective area has a transmittance higher than that of the other area belonging to the reflective area. A plurality of partial areas having a large transmittance are provided, and the total surface area of the partial areas having a large transmittance is substantially equal between a plurality of predetermined number of color filters. .

With this structure, it is possible to easily manufacture a plurality of color filters as compared with a case where the total surface areas of some regions having a large transmittance are different between the color filters.

In addition, by providing a plurality of partial regions having a large transmittance in each of the plurality of color filters having different wavelength pass bands, the plurality of color filters have different colors in the reflection mode and the transmission mode. The thickness can be made similar.

Further, since each of the color filters is provided with a plurality of partial regions having a large transmittance, the number of times external light passes through the partial regions having a large transmittance in the reflection mode can be averaged. .

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength passbands is provided with a plurality of regions having a large transmittance, only one color filter has a region having a large transmittance. When plural viewing angles are changed as compared with a case where a plurality of color filters are provided and one area having a large transmittance is provided,
It is possible to further suppress the color change felt by humans.

In the liquid crystal display device according to the sixth aspect, in each of the plurality and the predetermined number of color filters, a part of the region belonging to the reflective region has a different transmittance from the other region of the part belonging to the reflective region. A plurality of the partial areas having the large transmittance are provided, and the total surface area of the partial areas having the large transmittance is determined for each color filter.

With this structure, it is possible to adjust the total surface area of the plurality of partial regions having a large transmittance in each of the plurality of color filters.

Further, it is possible to provide only a predetermined number of color filters with a part of the region having a large transmittance, while providing a color filter not having a part of the region having a large transmittance.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since a plurality of partial areas having a large transmittance are provided in each of the plurality of and the predetermined number of color filters, a plurality of partial areas having a large transmittance are provided only in one color filter, The degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance by adjusting the total surface area.

In addition, since each color filter is provided with a plurality of partial regions having a large transmittance, the number of times external light passes through the partial regions having a large transmittance in the reflection mode can be averaged. .

As a result, when a person views the display on the liquid crystal display device, it is possible to suppress the change in color that the person feels as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength passbands is provided with a plurality of regions having a large transmittance, only one color filter has a region having a large transmittance. When plural viewing angles are changed as compared with a case where a plurality of color filters are provided and one area having a large transmittance is provided,
It is possible to further suppress the color change felt by humans.

According to another aspect of the liquid crystal display device of the present invention, the color triangle of the light output from the reflective region of the color filter layer is a transmissive region of the color filter layer in a part of the region where the transmissivity of the reflective region of the color filter is high. It has a surface area that approximates the color triangle of the light output from.

With this structure, the hues of the colors displayed in the transmissive mode and the reflective mode can be made approximately the same.

In the liquid crystal display device according to claim 8, the transmittance of a part of the region having a large transmittance is substantially “1” in the visible light region.

With this configuration, the absorption of light in the reflection mode is further suppressed, the brightness in the reflection mode is further improved, and the color depth can be made approximately the same in the reflection mode and the transmission mode. Is demonstrated more effectively.

Further, as compared with the case where a part of the region having a large transmittance is colored so that the transmittance is substantially less than "1", the manufacturing becomes easier.

In a liquid crystal display device according to a ninth aspect, a light source provided in the first layer, a first polarizing means provided in the second layer, a reflecting means provided in the third layer, and a fourth means. A liquid crystal layer provided in the layer, a color filter layer provided in the fifth layer and forming a pixel region corresponding to one pixel,
A second polarizing means provided in the sixth layer, the color filter layer has a reflective area for displaying in the reflective mode and a transmissive area for displaying in the transmissive mode, and the reflective means has an opening. And the opening is formed at a position facing the transmission region of the color filter layer through the liquid crystal layer,
The color filter layer is formed by planarly arranging a plurality of color filters having different wavelength pass bands, and each of the plurality of color filters has a portion belonging to a reflection region and a portion belonging to a transmission region, and at least In one color filter, a part of the area belonging to the reflective area has a different transmittance from the other areas of the area belonging to the reflective area,
In addition, it has a wavelength pass band in a predetermined range.

With this configuration, the transmittance and the wavelength passband of a part of the portion belonging to the reflection area of the color filter,
You can adjust the color balance in reflection mode by adjusting.

Further, in the color filter, the surface area of a part of the regions having different transmittances and predetermined wavelength ranges is adjusted, and the color filters have different transmittances and predetermined wavelength ranges. The color balance in the reflection mode can also be adjusted by providing a color filter that does not have a part of the area.

Since the color balance can be adjusted as described above, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

By adjusting the transmittance and the wavelength passband of a part of the part belonging to the reflection area of the color filter, the waveform representing the transmittance of that part of the area can be adjusted.

As a result, the spectral distribution in the reflection mode can be finely controlled. Therefore, compared with the case where the transmittance of a part of the region belonging to the reflective region of the color filter is constant in the visible light region and the waveform representing the transmittance of the partial region cannot be adjusted, The spectral distribution of the mode can be made closer to the spectral distribution of the transmission mode.

As a result, in the reflection mode and the transmission mode,
The color strength can be made similar.

Further, since the color filter is provided with a partial structure having different transmittances and wavelength pass bands in a predetermined range, the above-mentioned effect can be obtained.
The cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the transflective liquid crystal display device is constructed without providing the transflective film (transflective plate),
Inconveniences such as coloring and contrast reduction due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

In the liquid crystal display device according to the tenth aspect, in each of the plurality and the predetermined number of color filters, a part of the area belonging to the reflective area has a different transmittance and a different area from the other area of the part belonging to the reflective area. The color filter has a wavelength pass band in a predetermined range, and the transmittance and the wavelength pass band of a part of the range are determined for each color filter.

With this configuration, in each of the plurality of color filters, it is possible to adjust the transmittance and the wavelength pass band of a part of the region belonging to the reflection region.

In this way, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range, only one color filter has a different transmittance and a predetermined range. The degree of freedom in adjusting the color balance is increased as compared with the case where the color balance is adjusted by providing a partial area having a wavelength pass band in the above range.

Further, since the spectral distribution in the reflection mode can be finely controlled in each of the plurality of color filters,
In a plurality of color filters, the reflection mode spectral distribution and the transmission mode spectral distribution can be made close to each other.

As a result, in a plurality of color filters, it is possible to make the color depths of the reflection mode and the transmission mode similar to each other.

In the liquid crystal display device according to the eleventh aspect, the surface area of a part of the regions having different transmittances and wavelength pass bands in a predetermined range is substantially between a plurality of and a predetermined number of color filters. equal.

With this configuration, compared to the case where the surface areas of some regions having different transmittances and wavelength passbands in a predetermined range are made different between a plurality of and a predetermined number of color filters, it is simpler. Can be manufactured.

Further, in the plurality of color filters, the surface area of a part of the regions having different transmittances and wavelength pass bands of a predetermined range is fixed to a constant value, so that the parameter for adjusting the color balance becomes One less, so you can easily adjust the color balance.

In the liquid crystal display device according to the twelfth aspect, the surface area of a part of the regions having different transmittances and wavelength pass bands within a predetermined range is determined for each color filter.

With this structure, it is possible to adjust the surface area of a portion of each of the plurality of color filters having different transmittances and wavelength pass bands in a predetermined range.

Further, while only a predetermined number of color filters are provided with some regions having different transmittances and wavelength passbands in a predetermined range, different transmittances and wavelength passbands in a predetermined range are provided. It is possible to provide a color filter that does not have a part of the region that has.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range,
Only one color filter is provided with a partial area having different transmittances and wavelength passbands in a predetermined range,
The degree of freedom in adjusting the color balance is increased as compared with the case where the surface area is adjusted to adjust the color balance.

In the liquid crystal display device according to the thirteenth aspect, a part of the area belonging to the reflective area has a different transmittance from the other area of the area belonging to the reflective area, and has a predetermined range. In a color filter having a wavelength pass band,
A plurality of partial areas having different transmittances and a predetermined range of wavelength passbands are provided.

With this configuration, since one color filter is provided with a plurality of partial regions having different transmittances and wavelength passbands within a predetermined range, different transmittances and predetermined ranges are set in the reflection mode. It is possible to average the number of times external light passes through a part of a region having a wavelength pass band of the range.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in color felt by the human as much as possible when the viewing angle is changed.

In the liquid crystal display device according to the fourteenth aspect, in each of the plurality and the predetermined number of color filters, a part of the area belonging to the reflective area has a different transmittance and a different area from the other area of the part belonging to the reflective area. A plurality of partial areas having a predetermined range of wavelength passbands and different transmittance and a predetermined range of wavelength passbands are provided, and the partial areas of the transmittance and the wavelength are provided. The pass band is determined for each color filter.

With this structure, in each of the plurality of color filters, it is possible to adjust the transmittance and the wavelength pass band of a part of the region belonging to the reflection region.

In this way, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range, only one color filter has a different transmittance and a predetermined range. The degree of freedom in adjusting the color balance is increased as compared with the case where the color balance is adjusted by providing a partial area having a wavelength pass band in the above range.

Further, since the spectral distribution in the reflection mode can be finely controlled in each of the plurality of color filters,
In a plurality of color filters, the reflection mode spectral distribution and the transmission mode spectral distribution can be made close to each other.

As a result, in a plurality of color filters, it is possible to make the color depths of the reflection mode and the transmission mode similar to each other.

Further, since each of the color filters is provided with a plurality of partial areas having different transmittances and wavelength pass bands within a predetermined range, different transmittances and predetermined ranges are provided in the reflection mode. It is possible to average the number of times external light passes through some regions having a wavelength pass band.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength passbands is provided with a plurality of partial regions having different transmittances and wavelength passbands within a predetermined range, only one color filter is provided. , A plurality of partial regions having different transmittances and wavelength ranges in a predetermined range are provided, and other color filters have some regions having different transmittances and wavelength ranges in a predetermined range. Compared with the case of providing one, when changing the viewing angle,
It is possible to further suppress the color change felt by humans.

In the liquid crystal display device according to the fifteenth aspect, the total surface area of a part of regions having different transmittances and wavelength pass bands in a predetermined range is substantially the same among a plurality of and a predetermined number of color filters. Equal to each other

With this configuration, compared with the case where the total of the surface areas of some regions having different transmittances and wavelength pass bands in a predetermined range is different between a plurality of and a predetermined number of color filters. It can be easily manufactured.

Further, in a plurality of color filters, the total surface area of a part of regions having different transmittances and wavelength pass bands in a predetermined range is fixed to a constant value, so that the color balance is adjusted. Since there is one less parameter, the color balance can be easily adjusted.

In the liquid crystal display device according to the sixteenth aspect, the total surface area of a part of regions having different transmittances and wavelength pass bands in a predetermined range is determined for each color filter.

With this structure, it is possible to adjust the total surface area of a plurality of partial regions having different transmittances and wavelength pass bands in a predetermined range in each of the plurality of color filters.

Further, while only a predetermined number of color filters are provided with some regions having different transmittances and wavelength passbands in a predetermined range, different transmittances and wavelength passbands in a predetermined range are provided. It is possible to provide a color filter that does not have a part of the region that has.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range,
Only one color filter is provided with a partial area having different transmittances and wavelength passbands in a predetermined range,
The degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance by adjusting the total surface area.

In the liquid crystal display device according to the seventeenth aspect, in the reflection area of the color filter, a part of areas having different transmittances and wavelength passage areas of a predetermined range are output from the reflection area of the color filter layer. The transmittance and wavelength passband are such that the color triangle of the light that is emitted approaches the color triangle of the light that is output from the transmission region of the color filter layer.

With this structure, the hues of the colors displayed in the transmissive mode and the reflective mode can be made similar.

In the liquid crystal display device according to the eighteenth aspect, a part of the area belonging to the reflective area has a different transmittance from the other areas of the area belonging to the reflective area, and has a predetermined wavelength passage. In a color filter having regions, some regions have a higher transmissivity than other regions.

With this structure, when external light passes through the color filter in the reflection mode, part of the external light passes through a part of the region having a large transmittance.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color intensity can be made almost the same in the reflection mode and the transmission mode.

In the liquid crystal display device according to the nineteenth aspect, a part of the region having a large transmittance is used as the opening.

With this structure, the light passing through the opening is not absorbed by the color filter, so that the absorption of light in the reflection mode is further suppressed and the brightness in the reflection mode is further improved. In the reflective mode and the transmissive mode, the effect that the color density can be made approximately the same is more effectively exhibited.

Embodiments of the present invention will be described below with reference to the drawings. The liquid crystal display device in the embodiment is a transflective liquid crystal display device.

That is, the liquid crystal display device in the embodiment functions as a reflection type using external light in a bright place (reflection mode), and in a dark place as a transmission type using a backlight (transmission mode). ).

In this specification, a mode that functions as a reflection type is called a "reflection mode", and a mode that functions as a transmission type is called a "transmission mode".

(Embodiment 1) FIG. 1 is an explanatory diagram of a structure of a liquid crystal display device according to Embodiment 1 of the present invention. FIG. 1A is a structural diagram of the liquid crystal display device according to the first embodiment, and FIG. 1B is a sectional view taken along the line AA of FIG. Note that FIG. 1A is a view seen from the direction of arrow a in FIG.

As shown in FIG. 1A, in this liquid crystal display device, the backlight 6 is provided in the first layer, the polarizing plate 5 is provided in the second layer, the reflecting plate 4 is provided in the third layer, and Liquid crystal layer 3 in layer 4
The color filter layer 2 is provided as the fifth layer, and the polarizing plate 1 is provided as the sixth layer.
Is provided.

Then, as shown in FIGS. 1 (a) and 1 (b),
The color filter layer 2 has a reflective region r for display in the reflective mode and a transmissive region t for display in the transmissive mode.

Further, as shown in FIG. 1A, the reflection plate 4
An opening 7 is formed in the. The opening 7 is formed at a position facing the transmissive region t of the color filter layer 2 with the liquid crystal layer 3 in between.

Further, as shown in FIG. 1B, the color filter layer 2 is formed by planarly arranging three color filters 2a, 2b and 2c having different wavelength pass bands.

Specifically, the color filter layer 2 is made of Re
d (red) color filter 2a, Green (green) color filter 2b, Blue (blue) color filter 2
c are arranged in a plane and are formed.

Here, the color filter layer 2 corresponds to one pixel. That is, the three color filters 2a, 2
One pixel is composed of b and 2c.

The three color filters 2a, 2b,
2c are made of the same rectangle and have the same surface area.

Further, as shown in FIG. 1A, a transparent region 20 is formed in the reflective region r of the color filter layer 2.

More specifically, as shown in FIG. 1B, the transparent area 20a is formed in the reflective area r of the color filter 2a.
Is formed, the transparent region 20b is formed in the reflection region r of the color filter 2b, and the reflection region r of the color filter 2c is formed.
A transparent region 20c is formed on the surface.

Three transparent areas 20a, 20b, 20c
Consist of the same rectangle and have the same surface area.

For example, a transparent glass is masked,
After applying the paint, by removing the mask,
Color filters 2a, 2b, 2c having transparent areas 20a, 20b, 20c can be created.

In this specification, the "transparent region" means
It is a region where the transmittance T in the visible light region is substantially "1".

In this specification, the transmittance T being substantially "1" means that the transmittance T is generally from "0.9" to "1".
Say the range.

In the following, the transparent areas 20a, 20b, 20
It is assumed that the transmittance T of c is “1”.

Here, the transmittance T is defined as the incident light intensity "I
0 ”, and the light intensity after passing through the medium is“ I ”, T =
It is expressed as I / I0. Therefore, 0 ≦ T ≦ 1.

Therefore, the transmittance T # when light passes through the same medium twice is the square of T.

The transmissivity T is, in other words, the transmissivity when light passes through the medium once, that is, the transmissivity of the medium itself, and is clearly distinguished from the transmissivity T #.

Now, in the color filter 2a, the transmittance T and the wavelength pass band of the reflective region r excluding the transparent region 20a are
It is the same as the transmittance T of the transmission region t and the wavelength pass band.

In the color filter 2b, the transparent area 20b
The transmittance T and the wavelength passband of the reflection region r except for are the same as the transmittance T and the wavelength passband of the transmission region t.

In the color filter 2c, the transparent area 20c
The transmittance T and the wavelength passband of the reflection region r except for are the same as the transmittance T and the wavelength passband of the transmission region t.

Now, the transmission mode will be described in detail. As shown in FIG. 1A, in the transmissive mode, the light from the backlight 6 is generated by the polarizing plate 5, the opening 7, and
The light passes through the liquid crystal layer 3, enters the transmission region t of the color filter layer 2, and exits from the polarizing plate 1 in front of the device. The transmittance T in this case will be described with reference to the drawings.

FIG. 2 is an explanatory diagram of the transmissivity T in the transmissive mode of the liquid crystal display device according to the first embodiment, and shows the relationship between the transmissivity T in the transmissive mode and the wavelength.

In FIG. 2, the vertical axis represents the color filter 2
The transmittance T when the light passes through the transmission regions t of a, 2b, and 2c once, and the horizontal axis indicates the wavelength of the light.

Further, in FIG. 2, arrows 2a, 2b, 2
The curves indicated by c are color filters 2a and 2a, respectively.
The transmittance T is shown when the light passes through the transmissive regions t of b and 2c once.

In other words, the curves indicated by the arrows 2a, 2b and 2c are the color filters 2a, 2b and 2c, respectively.
The light is 1 in the area excluding the transparent areas 20a, 20b, 20c of
The transmittance T is shown when the light beam passes once.

Furthermore, in other words, the arrows 2a, 2b,
The curves indicated by 2c are color filters 2a, 2 and 2, respectively.
The wavelength passbands of the regions except the transparent regions 20a, 20b, and 20c of b and 2c are shown.

In this way, the color filters 2a, 2b,
2c has different wavelength passbands.

As can be seen from FIG. 1A, in the transmissive mode, the light from the backlight 6 passes through the color filter layer 2 only once. Therefore, as shown in FIG. The T peak is large, reaching about 0.9.

Now, the reflection mode will be described in detail. As shown in FIG. 1A, in the reflection mode, external light incident on the polarizing plate 1 from the front side of the present device passes through the color filter layer 2 and is totally reflected by the reflection plate 4, and is again reflected by the color filter. It passes through layer 2 and exits from polarizer 1 in front of the device.

That is, in the reflection mode, external light passes through the color filter layer 2 twice. In this case, a part of external light passes through the transparent region 20 of the color filter layer 2 once or twice.

As described above, in the reflection mode, a part of the external light passes through the transparent region 20, so that the brightness is improved, and the color depths of the reflection mode and the transmission mode can be made similar. it can. This point will be described in detail with reference to the drawings. FIG. 3 is an explanatory diagram of the transmittance T # in the reflection mode of the liquid crystal display device according to the first embodiment.

FIG. 3A shows the color filters 2a and 2a.
b, 2c reflective areas r (transparent areas 20a, 20b, 20
Excluding c. ) Is a diagram showing the relationship between the transmittance T # and the wavelength when the light passes through two times, and FIG.
3 is a diagram showing the relationship between the transmittance T # and the wavelength when light passes through the transparent regions 20a, 20b, and 20c of b and 2c twice, FIG.
(C) is a relationship diagram between the transmittance T # and the wavelength when light passes twice through the reflection regions r (including the transparent regions 20a, 20b, 20c) of the color filters 2a, 2b, 2c. .

In FIG. 3, the vertical axis represents the transmittance T #,
The horizontal axis represents the wavelength of light. In FIG. 3A, the curves indicated by the arrows 2a, 2b, 2c are the reflection regions r (transparent regions 20) of the color filters 2a, 2b, 2c, respectively.
Excluding a, 20b, and 20c. ) Shows the transmittance T # when light passes twice.

The transmittance T of the reflection area r (excluding the transparent areas 20a, 20b and 20c) of the color filters 2a, 2b and 2c is the same as the transmittance T of the transmission area t of the color filters 2a, 2b and 2c. is there.

However, as shown in FIG. 1A, since the light passes twice in the reflection mode, the transmittance T is squared.

Therefore, as shown in FIG. 3A, the reflection regions r (transparent regions 20) of the color filters 2a, 2b, 2c are shown.
Excluding a, 20b, and 20c. 2) is smaller than the transmittance T in the transmission mode shown in FIG.

FIG. 3B shows transparent areas 20a, 20b,
It shows the transmittance T # when light passes through 20c twice.

Since the transmissivity T of the transparent areas 20a, 20b, 20c of the color filters 2a, 2b, 2c is "1" as described above, the transmissivity T is as shown in FIG. 3 (b).
# Is also "1".

In FIG. 3C, arrows 2a, 2b, 2
The curves indicated by c are color filters 2a and 2a, respectively.
b, 2c reflective areas r (transparent areas 20a, 20b, 20
Including c. ) Shows the transmittance T # when light passes twice.

The transparent areas 20a, 20b, 20c are not individually seen but the transparent areas 20a, 20b, 20c are not individually seen.
Considering the transmissivity T # of the entire reflection region r including the transmissive region r, the transmissivity T # of FIG. 3A and the transmissivity T # of FIG.
# And are combined, and the result is as shown in FIG.

That is, the color filters 2a, 2b, 2c
By providing the transparent regions 20a, 20b, and 20c in the above, the transmissivity T # is combined, and as shown in FIG. 3C, the transmissivity T # in the reflection mode is equal to the reflective region of FIG. Transmittance T # of r (excluding transparent regions 20a, 20b, 20c)
Get bigger.

Therefore, as shown in FIG. 3C, the waveform representing the transmittance T # of each color filter 2a, 2b, 2c in the reflection mode is the color filter 2a shown in FIG.
The waveforms approach the transmittance T in the transmission modes 2b and 2c.

As a result, in the reflection mode and the transmission mode,
The color strength can be made similar.

As described above, in the present embodiment,
In the color filters 2a, 2b, 2c, the transparent area 2
0a, 20b, 20c are transparent areas 20a, 20b, 2
It has a transmittance T larger than the reflection region r except 0c.

Therefore, the color filter 2 is set in the reflection mode.
When external light passes through a, 2b, and 2c, a part of the external light has transparent regions 20a, 20b, and 20c having a large transmittance T.
Pass through.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color depth can be made almost the same in the reflection mode and the transmission mode.

The three color filters 2a, 2b, 2
a transparent region 20a having a large transmittance T in all of c,
Since 20b and 20c are provided, it is possible to make the color depths of the three color filters 2a, 2b, and 2c approximately the same in the reflection mode and the transmission mode.

Further, in this embodiment, the color filter 2a, 2b, 2c has a transparent region 20 having a large transmittance T.
Since the above-mentioned effects are obtained with a simple configuration in which a, 20b, and 20c are provided, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, in this embodiment, since the semi-transmissive liquid crystal display device is configured without providing the semi-transmissive reflective film (semi-transmissive reflective plate), the semi-transmissive reflective film (semi-transmissive reflective plate). Inconveniences such as coloring and reduction in contrast due to are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

Here, in particular, in this embodiment, the transmittance T of the transparent regions 20a, 20b, 20c is substantially "1" in the visible light region.

Therefore, the effect that the absorption of light in the reflection mode is further suppressed, the brightness of the reflection mode is further improved, and the color depths of the reflection mode and the transmission mode can be made substantially the same, It is demonstrated more effectively.

Further, as compared with the case where the transparent regions 20a, 20b, 20c are colored so that the transmittance T thereof is substantially smaller than "1", the manufacturing becomes easier.

In the above description, the color filters 2a, 2
Although the transparent areas 20a, 20b, 20c are formed in the areas b, 2c, an opening may be formed in the color filters 2a, 2b, 2c instead of the transparent areas 20a, 20b, 20c.

In this case, the light passing through the opening is not absorbed by the color filters 2a, 2b, 2c at all, so that the light absorption in the reflection mode is further suppressed and the brightness in the reflection mode is further improved. The effect that the color density is improved to the same extent in the reflection mode and the transmission mode is more effectively exhibited.

(Embodiment 2) FIG. 4 is an explanatory diagram showing the structure of a liquid crystal display device according to Embodiment 2 of the present invention. 4A is a structural diagram of the liquid crystal display device according to the second embodiment, and FIG. 4B is a sectional view taken along line BB of FIG. 4A. Note that FIG. 4A is a view seen from the direction of the arrow a in FIG. Note that, in FIG. 4, the same parts as those in FIG.

As shown in FIGS. 4 (a) and 4 (b), the liquid crystal display device according to the second embodiment has a fifth layer instead of the color filter layer 2 of FIGS. 1 (a) and 1 (b). 4 (a)
The color filter layer 2 of (b) is provided, and other points are the same as those of the liquid crystal display device of FIG. 1. Hereinafter, the points different from the first embodiment will be mainly described.

As shown in FIG. 4B, a transparent region 21 is formed in the reflective region r of the color filter layer 2. The meaning of “transparent region” is the same as in the first embodiment.

More specifically, as shown in FIG. 4B, the transparent area 21a is formed in the reflective area r of the color filter 2a.
Is formed. The transparent area 21b is formed in the reflection area r of the color filter 2b. The color filter 2
No transparent region is formed in the reflective region r of c.

The transparent area 21a and the transparent area 21b are rectangular. However, the surface area of the transparent region 21a and the surface area of the transparent region 21b are different.

As described above, the color balance can be adjusted by changing the surface area of the transparent region formed on the color filter or not forming the transparent region. This point will be described later in detail with reference to the drawings.

The color filter 2a shown in FIG.
2b and 2c are the same as the color filters 2a, 2b and 2c of FIG. 1B except the transparent regions 21a and 21b.

The method for producing the color filters 2a, 2b having the transparent areas 21a, 21b is the same as the method for producing the color filters 2a, 2b, 2c of the first embodiment.

Now, the transmission mode will be briefly described. As shown in FIG. 4A, in the transmissive mode, the light from the backlight 6 is transmitted through the polarizing plate 5, the opening 7, and
The light passes through the liquid crystal layer 3, enters the transmission region t of the color filter layer 2, and exits from the polarizing plate 1 in front of the device. Thus, the function of the transparent mode is similar to that of the first embodiment.

As described above, the color balance can be adjusted by changing the surface area of the transparent area formed in the color filter or not forming the transparent area.
This point will be described in detail with reference to the drawings.

FIG. 5 is an explanatory diagram of color balance adjustment by the liquid crystal display device according to the present embodiment. Figure 5
Shows an xy chromaticity diagram.

The RGB color triangle (solid line) indicated by the arrow A1 in FIG. 5 is the transparent area 21a, 2 in FIG.
It is a color triangle in the reflection mode when it is assumed that 1b is not formed.

As in this embodiment, the color filter 2
By providing the transparent areas 21a and 21b in a and 2b and adjusting the surface areas of the transparent areas 21a and 21b, it is possible to adjust the color triangle in the reflection mode (the solid triangle shown by the arrow A1).

That is, the transparent regions 21a and 21b are provided in the color filters 2a and 2b, and the transparent regions 21a and 21b are provided.
The color balance in the reflection mode (the solid line triangle indicated by the arrow A1) can be adjusted by adjusting the surface area of.

In FIG. 4, since no transparent area is formed in the color filter 2c, as shown in FIG. 5, B (blue) is used.
The vertices of the color triangle corresponding to are not moving. Thus, when it is not desired to move the vertices of the color triangle, the transparent area is not formed.

On the other hand, by forming the transparent areas 21a and 21b in the color filters 2a and 2b, as shown in FIG. 5, the vertices of the color triangle corresponding to R (red) and G
The vertex of the color triangle, which corresponds to (green), is moving inward.

The width of movement of the vertices of the color triangle is
It can be adjusted by changing the surface area of the transparent region. The larger the surface area of the transparent region, the larger the movement width, and the smaller the surface area of the transparent region, the smaller the movement width.

In the present embodiment, the color balance in the reflection mode can be adjusted as described above. By applying this, it is possible to correct the difference in the spectral distribution between the light from the backlight 6 and general external light. This point will be described in detail.

LED (light emitting)
diode), cold cathode tube, or EL (select)
The light from the backlight 6 including a luminescent element, etc., has a spectral distribution significantly different from general external light, and also has a different color balance.

Therefore, the color filters 2a, 2b, 2c
The transmittance T of the transparent areas 21a and 21b is excluded so that the backlight 6 can achieve color balance. That is, the transmittance T of the color filters 2a, 2b, 2c (excluding the transparent areas 21a, 21b) is set to a transmittance that allows color balance in the transmission mode. The transmittance T has the same meaning as in the first embodiment.

By adjusting the surface areas of the transparent regions 21a and 21b of the reflective regions r of the color filters 2a and 2b, the color in the reflective mode is adjusted so that the color triangle in the reflective mode approaches the color triangle in the transmissive mode. Adjust the balance. As a result, it is possible to correct the difference in the spectral distribution between the light from the backlight 6 and general external light. This point will be described with reference to the drawings.

In FIG. 5, the RGB color triangle (broken line) indicated by arrow A2 is the color triangle in the transmission mode in this embodiment.

As in the present embodiment, the color filter 2
By providing the transparent regions 21a and 21b in a and 2b and adjusting the surface areas of the transparent regions 21a and 21b, the color triangle in the reflection mode (the solid line triangle indicated by the arrow A1) is changed to the color triangle in the transmission mode ( It can be brought closer to the broken line triangle indicated by the arrow A2).

As a result, it is possible to correct the difference in the spectral distribution between the light from the backlight 6 and general external light,
The shades of the colors displayed in the transmissive mode and the reflective mode can be made similar.

By the way, as described above, in the present embodiment,
The surface areas of the two transparent areas 21a and 21b are different. On the other hand, the color filter 2c has no transparent region.

As described above, the color balance in the reflection mode can be adjusted by adjusting the surface area of the transparent region or providing the color filter having no transparent region.

Moreover, for each of the plurality of color filters,
Since a transparent area is provided, only one color filter
Compared with the case where the transparent area is provided and the surface area is adjusted to adjust the color balance, the degree of freedom in adjusting the color balance is increased.

Further, in this embodiment, the color filter layer is adjusted by adjusting the surface area of the transparent region or providing a color filter having no transparent region to adjust the color balance in the reflection mode. 2 reflective areas r
The color triangle of the light output from the color filter layer 2 may be close to the color triangle of the light output from the transmission region t of the color filter layer 2.

As a result, the hues of the colors displayed in the transmissive mode and the reflective mode can be made similar.

Further, in this embodiment, the transparent area 21
In the color filters 2a and 2b provided with a and 21b, it is possible to make the color depths of the reflection mode and the transmission mode similar to each other.

In this embodiment, the color filters 2a and 2b have transparent areas 20a and 20b having different surface areas.
With the simple configuration with
The cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, in this embodiment, since the semi-transmissive liquid crystal display device is constructed without providing the semi-transmissive reflective film (semi-transmissive reflective plate), the semi-transmissive reflective film (semi-transmissive reflective plate) is provided. Inconveniences such as coloring and reduction in contrast due to are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the color developability and contrast.

In the above, the color filters 2a, 2
Although the transparent areas 21a and 21b are formed in the
Instead of 1a and 21b, openings can be formed in the color filters 2a and 2b.

In this case, since the light passing through the opening is not absorbed by the color filters 2a and 2b at all, the absorption of light in the reflection mode is further suppressed and the brightness in the reflection mode is further improved. , And the transparent area 21a,
In the color filters 2a and 2b having 21b, the effect that the color density can be made approximately the same in the reflection mode and the transmission mode is more effectively exhibited.

Further, a transparent region may be formed on any of the color filters 2a, 2b, 2c, or a color filter not forming a transparent region may be provided. Further, the value of the surface area of the transparent region can be arbitrarily determined.

That is, the color filter forming the transparent region and the surface area of the transparent region are determined by how the color balance in the reflection mode is set.

(Embodiment 3) FIG. 6 is an explanatory diagram showing the structure of a liquid crystal display device according to Embodiment 3 of the present invention. FIG. 6A is a structural diagram of the liquid crystal display device according to the third embodiment, and FIG. 6B is a sectional view taken along line CC of FIG. 6A. Note that FIG. 6A is a view seen from the direction of arrow a in FIG. Note that, in FIG. 6, the same parts as those in FIG.

As shown in FIGS. 6A and 6B, the liquid crystal display device according to the third embodiment has a fifth layer instead of the color filter layer 2 shown in FIGS. 6 (a)
The color filter layer 2 of (b) is provided, and other points are the same as those of the liquid crystal display device of FIG. 1. Hereinafter, the points different from the first embodiment will be mainly described.

As shown in FIGS. 6A and 6B, a transparent region 23 is formed in the reflective region r of the color filter layer 2. The meaning of “transparent region” is the same as in the first embodiment.

More specifically, as shown in FIG. 6B, six transparent areas 23a are formed in the reflective area r of the color filter 2a, and six transparent areas 23a are formed in the reflective area r of the color filter 2b. 23b is formed and the color filter 2c is formed.
Six transparent regions 23c are formed in the reflective region r of the.

The six transparent regions 23a are made of the same rectangle and have the same surface area. 6 transparent areas 23b
Consist of the same rectangle and have the same surface area. The six transparent regions 23c have the same rectangular shape and have the same surface area.

Then, the transparent areas 23a, 23b and 23c.
Consist of the same rectangle and have the same surface area. That is, the total surface area of the six transparent regions 23a, the total surface area of the six transparent regions 23b, and the six transparent regions 23.
The total surface area of c is the same.

The color filter 2a shown in FIG.
2b and 2c, transparent areas 23a, 23b and 23c
The other points are that the color filters 2a, 2b of FIG.
The same as 2c.

The method for producing the color filters 2a, 2b, 2c having the transparent areas 23a, 23b, 23c is as follows.
This is the same as the method of creating the color filters 2a, 2b, 2c of the first embodiment.

Now, the transmission mode will be briefly described. As shown in FIG. 6A, in the transmissive mode, the light from the backlight 6 is emitted from the polarizing plate 5, the opening 7, and
The light passes through the liquid crystal layer 3, enters the transmission region t of the color filter layer 2, and exits from the polarizing plate 1 in front of the device. Thus, the function of the transparent mode is similar to that of the first embodiment.

Now, the reflection mode will be described. As shown in FIG. 6A, in the reflection mode, the external light incident on the polarizing plate 1 from the front side of the present device passes through the color filter layer 2 and is totally reflected by the reflection plate 4, and is again reflected by the color filter. It passes through layer 2 and exits from polarizer 1 in front of the device. This point will be described in detail with reference to the drawings.

FIG. 7 is a detailed explanatory diagram of the reflection mode of the liquid crystal display device according to the third embodiment of the present invention. Figure 7
7A is an explanatory diagram of a reflection mode of the liquid crystal display device according to the first embodiment, and FIG. 7B is an explanatory diagram of a reflection mode of the liquid crystal display device according to the third embodiment.

In FIG. 7A, the same parts as those in FIG. 1A are designated by the same reference numerals. Also,
In FIG. 7B, the same parts as those in FIG. 6A are designated by the same reference numerals.

As shown in FIG. 7A, in the first embodiment, the external light x2 incident at an angle passes through the reflection region r (excluding the transparent region 20) of the color filter layer 2 and is reflected. It is reflected by the plate 3, passes through the transparent region 20, and goes out forward.

On the other hand, external light x1 incident at another angle passes through the transparent region 20 of the color filter layer 2, is reflected by the reflection plate 3, passes through the transparent region 20 again, and goes out forward. .

As described above, depending on the incident angle of external light, the external light may pass through the transparent region 20 of the color filter layer 2 only once or twice. Although not given as an example, it may not pass through the transparent region 20.

As described above, the number of times the light passes through the transparent region 20 is biased due to the change in the incident angle of external light.

Such a deviation in the number of passages through the transparent area 20 means that when a person views a display on a liquid crystal display device, the person can feel a change in color when the viewing angle is changed.

Therefore, in this embodiment, in order to prevent such a color change, the following configuration is adopted.

As shown in FIG. 6B, in this embodiment, six transparent regions 23a, 23b, 23c are formed in each of the color filters 2a, 2b, 2c.

Therefore, even if the incident angle of the external light changes, the external light passes through the transparent region once and the reflective region r (excluding the transparent region) once, and goes out forward. Becomes higher.

In other words, even when the incident angle of external light changes, the deviation in the number of times external light passes through the transparent region is reduced.

For example, as shown in FIG. 7B, the external light x2 at a certain incident angle and the external light x1 at another incident angle are also transparent areas 2.
3 once, the reflection area r (excluding the transparent area 23) is set to 1
Pass, pass, and go forward.

As described above, in the present embodiment, a plurality of transparent areas 23 are provided in each of the color filters 2a, 2b and 2c.
Since a, 23b, and 23c are provided, the number of times external light passes through the transparent region is averaged.

Therefore, when a person views the display on the liquid crystal display device, it is possible to suppress the change in the color that the person feels as much as possible when the viewing angle is changed.

Since a plurality of corresponding transparent areas 23a, 23b, 23c are provided for each of the plurality of color filters 2a, 2b, 2c having different wavelength passbands, one
Compared to the case where a plurality of transparent regions are provided only in one color filter and one transparent region is provided in the other color filters, it is possible to further suppress the change in color that a human feels when the viewing angle is changed.

Further, in this embodiment, the transparent regions 23a, 23b are formed between the color filters 2a, 2b, 2c.
The total surface area of 23b and 23c is substantially equal.

Therefore, the color filters 2a, 2b, 2
between the transparent regions 23a, 23b, 23c
Compared to the case where the total surface area of the is different, it can be easily manufactured.

Further, in the present embodiment, the transmittance T is substantially "1" for each of the color filters 2a, 2b, 2c.
A plurality of transparent areas 23a, 23b and 23c are provided.

Therefore, the color filter 2 is set in the reflection mode.
When external light passes through a, 2b, and 2c, a part of the external light has a transparent region 20a, 20 having a transmittance T of substantially "1".
Pass b and 20c.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color depth can be made almost the same in the reflection mode and the transmission mode.

The three color filters 2a, 2b, 2
Since the transparent regions 20a, 20b, and 20c having the transmittance T of substantially "1" are provided in all of c, the three color filters 2a, 2b, and 2c have a reflective mode and a transmissive mode. , It is possible to make the color strength similar.

Further, in the present embodiment, the above-mentioned effects are obtained by the simple structure in which the transparent regions 20a, 20b, 20c having the transmittance T of "1" are provided in the color filters 2a, 2b, 2c. Therefore, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, in this embodiment, since the transflective liquid crystal display device is configured without providing the transflective film (semitransmissive reflection plate), the transflective film (semitransmissive reflection plate) is formed. Inconveniences such as coloring and reduction in contrast due to are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the color developability and the contrast.

Next, a modification of the liquid crystal display device according to the third embodiment will be described. This modification is a combination of the second embodiment and the third embodiment. Specifically, it is as follows.

The transparent area 21a in FIG. 4B is not formed by one transparent area, but is formed by a plurality of transparent areas 23a as shown in FIG. 6B. Similarly, FIG.
The transparent region 21b in (b) is not formed by one transparent region, but is formed by a plurality of transparent regions 23b as shown in FIG. 6 (b).

That is, in this case, the surface area of the transparent area 21a in FIG. 4B is adjusted by the number of the transparent areas 23a. Similarly, the surface area of the transparent area 21b is adjusted by the number of the transparent areas 23b.

Furthermore, in other words, the positions of the vertices of the color triangle in the reflection mode are adjusted by the number of transparent areas provided,
Adjust the color balance. If it is not desired to move the vertices of the color triangle, no transparent area is formed.

Therefore, in this modification, in addition to the effects of the third embodiment, the effects of the second embodiment are also exhibited.

In the third embodiment, the color filters 2a, 2b and 2c are provided with transparent areas 23a and 23b.
Although 23c is provided, an opening may be formed in the color filters 2a, 2b, 2c instead of the transparent regions 23a, 23b, 23c. Also in the above-mentioned modified example, similarly,
The transparent region may be the opening.

In this case, since the light passing through the opening is not absorbed by the color filter at all, the absorption of light in the reflection mode is further suppressed, the brightness in the reflection mode is further improved, and In the color filter having the transparent region, the effect that the color depth can be made approximately the same in the reflection mode and the transmission mode is more effectively exhibited.

Further, although the surface areas of the transparent regions 23a, 23b, and 23c are the same in the third embodiment described above, the present invention is not limited to this and can be different. This point is the same in the modified example.

Further, although the six transparent regions 23a have the same surface area in the third embodiment described above, the present invention is not limited to this and can be different. This point is the same for the other transparent areas 23b and 23c or the modified example.

Further, in the above-mentioned modification, any of the color filters 2a, 2b, 2c may be provided with a transparent area, or a color filter having no transparent area may be provided.

Further, in the above modification, the total value of the surface areas of transparent regions (the number of transparent regions) in each of the color filters 2a, 2b, 2c can be arbitrarily determined.

That is, in the above-mentioned modification, the total of the surface area of the color filter and the transparent area (the number of transparent areas) is determined by the color balance in the reflection mode.

(Fourth Embodiment) FIG. 8 is an explanatory diagram showing the structure of a liquid crystal display device according to a fourth embodiment of the present invention. 8A is a structural diagram of the liquid crystal display device according to the fourth embodiment, and FIG. 8B is a sectional view taken along the line D-D of FIG. 8A. Note that FIG. 8A is a view seen from the direction of the arrow a in FIG. Note that, in FIG. 8, the same portions as those in FIG.

As shown in FIGS. 8A and 8B, the liquid crystal display device according to the fourth embodiment has a fifth layer instead of the color filter layer 2 shown in FIGS. 8 (a)
The color filter layer 2 of (b) is provided, and other points are the same as those of the liquid crystal display device of FIG. 1. Hereinafter, the points different from the first embodiment will be mainly described.

As shown in FIG. 8B, the color filter layer 2 includes three color filters 2 having different wavelength pass bands.
It is formed by arranging a, 2b, and 2c in a plane.

Specifically, the color filter layer 2 is made of Re
d (red) color filter 2a, Green (green) color filter 2b, Blue (blue) color filter 2
c are arranged in a plane and are formed.

However, as shown in FIG. 8A, a colored region 22 is formed in the reflective region r of the color filter layer 2.

More specifically, as shown in FIG. 8B, the colored area 22 is formed in the reflective area r of the color filter 2a.
a is formed.

However, the transmittance T and the wavelength passband of the colored region 22a are different from the transmittance T and the wavelength passband of the color filter 2a (excluding the colored region 22a).

In the color filter 2a, the transmissivity T and the wavelength pass band of the reflective area r excluding the transparent area 22a are
It is the same as the transmittance T of the transmission region t and the wavelength pass band.

Further, as shown in FIG. 8B, the colored region 22b is formed in the reflective region r of the color filter 2b.

However, the transmittance T and the wavelength passband of the colored region 22b are different from the transmittance T and the wavelength passband of the color filter 2b (excluding the colored region 22b).

In the color filter 2b, the transmissivity T and the wavelength pass band of the reflective region r excluding the transparent region 22b are
It is the same as the transmittance T of the transmission region t and the wavelength pass band.

Further, as shown in FIG. 8B, a colored area 22c is formed in the reflective area r of the color filter 2c.

However, the transmittance T and the wavelength passband of the colored region 22c are different from the transmittance T and the wavelength passband of the color filter 2c (excluding the colored region 22c).

In the color filter 2c, the transmissivity T and the wavelength pass band of the reflective area r excluding the transparent area 22c are:
It is the same as the transmittance T of the transmission region t and the wavelength pass band.

The colored areas 22a, 22b and 22c have the same surface area and are rectangular. Colored areas 22a, 22
b, 22c having color filters 2a, 2b, 2c
Can be created as follows, for example.

First, in the transparent glass, a mask is applied to the areas that should become the color filters 2b and 2c (including the colored areas 22b and 22c) and the areas that should become the colored areas 22a, and after applying the paint, the masks are applied. remove.

Next, in the transparent glass, the color filters 2b and 2c (including the colored areas 22b and 22c).
Area to be formed and color filter 2a (colored area 22
Excluding a. ) Mask the area that should be), apply paint, and then remove the mask.

As described above, the color filter 2a
(Including the colored region 22a) can be created. The color filter 2b (including the colored area 22b) and the color filter 2c (including the colored area 22c) can be created by the same procedure.

Next, the colored areas 22a, 22b and 22c will be described in detail with reference to the drawings.

FIG. 9 shows the colored area 2 of the color filter 2b.
It is a relationship diagram of the transmittance T of 2b and wavelength. In FIG. 9, the vertical axis represents the transmittance T and the horizontal axis represents the wavelength of light.

On the other hand, the color filter 2b (colored area 22
Excluding b. The transmittance T of) becomes like the curve indicated by the arrow 2b in FIG.

The meaning of the transmittance T is the same as that in the first embodiment. As can be seen by comparing FIGS. 2 and 9, the wavelength pass band of the colored region 22b is different from the wavelength pass band of the color filter 2b (excluding the colored region 22b).

As can be seen by comparing FIGS. 2 and 9, the transmittance T of the colored region 22b is equal to that of the color filter 2b.
It is larger than the transmittance T of (excluding the colored region 22b).

Although not shown, the wavelength pass band of the colored region 22a is different from the wavelength pass band of the color filter 2a (excluding the colored region 22a). In addition, the colored area 2
The transmittance T of 2a is equal to that of the color filter 2a (colored region 22
Excluding a. ) Is larger than the transmittance T.

Although not shown, the wavelength pass band of the colored region 22c is different from the wavelength pass band of the color filter 2c (excluding the colored region 22c). In addition, the colored area 2
The transmittance T of 2c is equal to that of the color filter 2c
Excluding c. ) Is larger than the transmittance T.

Now, the transmission mode will be briefly described. As shown in FIG. 8A, in the transmissive mode, the light from the backlight 6 is emitted from the polarizing plate 5, the opening 7, and
The light passes through the liquid crystal layer 3, enters the transmission region t of the color filter layer 2, and exits from the polarizing plate 1 in front of the device. Thus, the function of the transparent mode is similar to that of the first embodiment.

Now, the reflection mode will be described. As shown in FIG. 8A, in the reflection mode, external light incident on the polarizing plate 1 from the front side of the present device passes through the color filter layer 2 and is totally reflected by the reflection plate 4, and is again reflected by the color filter. It passes through layer 2 and exits from polarizer 1 in front of the device.

Colored area 2 in such a reflection mode
The roles of 2a, 22b, and 22c will be described in detail with reference to the drawings.

FIG. 10 is a detailed explanatory diagram of the reflection mode of the liquid crystal display device according to the fourth embodiment of the present invention.

FIG. 10A is a diagram showing the relationship between the transmittance T # and the wavelength when light passes twice through the reflection area r (excluding the colored area 22b) of the color filter 2b, and FIG.
Is a relationship diagram between the transmittance T # and the wavelength when light passes through the transparent region 22b of the color filter 2b twice, FIG.
(C) shows the transmittance T # when light passes twice through the reflection area r (including the transparent area 22b) of the color filter 2b.
FIG.

In FIG. 10, the vertical axis represents the transmittance T # and the horizontal axis represents the wavelength of light. The meaning of the transmittance # is the same as that in the first embodiment.

As shown in FIG. 10A, the transmittance T # of the reflection area r (excluding the colored area 22b) of the color filter 2b is the transmission area t of the color filter 2b indicated by the arrow 2b in FIG. It is smaller than the transmittance T.

Further, as shown in FIG. 10B, the transmittance T # of the colored area 22b is larger than the transmittance T of the transparent area t of the color filter 2b indicated by the arrow 2b in FIG.

Then, the reflection area r excluding the colored area 22b
And the colored region 22b are not individually viewed, but the transmittance T is not measured for the entire reflective region r including the colored region 22b.
Considering #, the transmittance T # of FIG.
The transmittance T # of FIG. 10B and the transmittance T # are combined into the result shown in FIG.

That is, the colored area 2 is formed on the color filter 2b.
By providing 2b, the transmissivity T # is synthesized, and FIG.
As shown in (c), the transmittance T # in the reflection mode becomes larger than the transmittance T # of the reflection region r (excluding the colored region 22b) in FIG. 10A, and the arrow 2b in FIG. It approaches the transmittance T in the transmission mode shown. This point will be confirmed using the drawings.

FIG. 11 is a comparison diagram of the transmittance T # in the reflection mode and the transmittance T in the transmission mode.

In FIG. 11, the horizontal axis represents the wavelength of light,
The vertical axis represents the transmittance T # for the reflection mode and the transmittance T for the transmission mode.

In FIG. 11, the curve indicated by the arrow B1 shows the transmittance T in the transmission mode for the color filter 2b, and the curve indicated by the arrow B2 (thick line) shows the transmittance in the reflection mode for the color filter 2b. T # is shown.

As can be seen from FIG. 11, by providing the colored region 22b in the color filter 2b, the waveform representing the transmittance T # in the reflection mode approaches the waveform representing the transmittance T in the coloring mode. . This also applies to the color filters 2a and 2c.

Now, the functions of the colored areas 22a, 22b and 22c will be summarized. Color filters 2a, 2b, 2c
By providing the colored regions 22a, 22b, and 22c having different wavelength pass bands (different wavelength widths) in the reflection region r, the wavelength pass band (wavelength width) of light in the reflection mode can be controlled.

In the above example, the color filters 2a, 2
By providing colored regions 22a, 22b, 22c having a wide wavelength pass band (wide wavelength width) in the reflection regions r of b and 2c (see FIGS. 9 and 10 (b)), the wavelength pass band in the reflection mode ( The wavelength width) is widened (see FIG. 10C).

The colored regions 22a, 22 having different center wavelengths are provided in the reflection regions r of the color filters 2a, 2b, 2c.
By providing b and 22c, the central wavelength in the reflection mode can be controlled.

In the above example, the color filters 2a, 2
The colored regions 2 having different center wavelengths are provided in the reflective regions r of b and 2c.
Although 2a, 22b and 22c are provided (see FIG. 9), colored regions 22a, 22b and 22c having the same central wavelength as the reflective region r except the colored regions 22a, 22b and 22c can be provided.

The colored regions 22a, 22 having different transmittances T are provided in the reflective regions r of the color filters 2a, 2b, 2c.
By providing b and 22c, the maximum transmittance T # in the reflection mode can be controlled.

In the above example, the color filters 2a, 2
The colored regions 2 having a large transmittance T are provided in the reflective regions r of b and 2c.
By providing 2a, 22b and 22c (see FIGS. 9 and 10)
(See (b)), and the maximum transmittance T # in the reflection mode is increased (see FIG. 10 (c)).

Colored regions 22a, 22b, 22c having different transmittances T and peaks of waveforms representing the transmittances T are provided in the reflection regions r of the color filters 2a, 2b, 2c.
By providing, it is possible to control the difference between the maximum transmittance T # and the minimum transmittance T # in the reflection mode.

In the above example, the color filters 2a, 2a
The colored regions 22a, 22 having a large transmittance T and a waveform showing the transmittance T has a peak in the reflection regions r of b and 2c.
By providing b and 22c (see FIGS. 9 and 10B), the maximum transmittance T # and the minimum transmittance T # in the reflection mode are provided.
The difference between and is large (see FIG. 10C).

This point is similar to the waveform of FIG.
It can be easily understood by comparing with the waveform of (c). Colored region 22 where the waveform representing the transmittance T has a peak
By providing a, 22b, and 22c, the transmittance T # in the reflection mode is more than that in the first embodiment in which the transparent regions 20a, 20b, and 20c having a flat waveform representing the transmittance T are provided.
It is possible to approximate the waveform representing the to the waveform representing the transmittance T in the transmission mode.

The fact that the waveform representing the transmittance T has a peak means that the wavelength pass band is defined. This is because if the waveform representing the transmittance T is flat, the wavelength passband is substantially undefined.

Now, as described above, the color filter 2
By providing colored regions 22a, 22b, and 22c having different wavelength pass bands and different transmittances T in the reflective regions r of a, 2b, and 2c, a waveform representing the transmittance T # in the reflective mode, that is, in the transmissive mode The spectral distribution of can be controlled.

In the above example, as shown in FIG. 11, the transmissivity T # in the reflection mode is close to the transmissivity T in the transmission mode. That is, the spectral distribution in the reflection mode is made closer to the spectral distribution in the transmission mode.

This is the colored areas 22a, 22b, 22c.
Is an example of controlling the spectral distribution in the reflection mode by adjusting the color balance as shown in FIG. 5 by adjusting the waveform representing the transmittance T of the colored regions 22a, 22b, 22c. You can also

In such color balance adjustment, the waveform representing the transmittance T of the colored areas 22a, 22b, 22c is different from the waveform representing the transmittance T of the reflective area r excluding the colored areas 22a, 22b, 22c. The wavelength passbands (wavelength widths) and center wavelengths of the colored regions 22a, 22b, 22c are the same as the wavelength passbands (wavelength width) and center wavelengths of the reflective region r excluding the colored regions 22a, 22b, 22c. But it's okay.

Now, as described above, in the present embodiment,
The colored regions 22 are formed on the color filters 2a, 2b, and 2c.
a, 22b, 22c are formed, and the colored regions 22a,
22b and 22c have different transmittance T and different wavelength passband from the reflective area r and the transmissive area t excluding the colored areas 22a, 22b and 22c (see FIG. 9).

Such colored areas 22a, 22b, 22
The color balance in the reflection mode can be adjusted by adjusting the transmittance T of c and the wavelength pass band.

Since the color balance can be adjusted in this way, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

The three color filters 2a, 2b,
Since the colored regions 22a, 22b, and 22c having different transmittances T and different wavelength passbands are provided in each of 2c,
The degree of freedom in adjusting the color balance is increased as compared with the case where the colored areas having different transmittances T and different wavelength passbands are provided in only one color filter to adjust the color balance.

In this embodiment, by adjusting the color balance in the reflection mode, the color triangle of the light output from the reflection area r of the color filter layer 2 is changed from the transmission area t of the color filter layer 2. It is also possible to approach the color triangle of the output light.

As a result, the hues of the colors displayed in the transmissive mode and the reflective mode can be made similar.

In this embodiment, the colored area 22 is also included.
By adjusting the transmittance T of the a, 22b, and 22c and the wavelength pass band, the waveform representing the transmittance T of the colored regions 22a, 22b, and 22c can be adjusted.

With this, the spectral distribution in the reflection mode can be finely controlled. Therefore, as in the first embodiment, the transparent regions 20a and 20 having the constant transmittance T in the visible light region.
b and 20c are provided, the spectral distribution in the reflection mode can be made closer to the spectral distribution in the transmission mode as compared with the case where the waveform representing the transmittance T cannot be adjusted.

As a result, in the reflection mode and the transmission mode,
The color strength can be made similar.

The three color filters 2a, 2b,
Since the spectral distribution in the reflection mode can be finely controlled in each of 2c, the spectral distribution in the reflection mode and the spectral distribution in the transmission mode can be made close to each other in each color filter 2a, 2b, 2c.

As a result, the three color filters 2a, 2
In b and 2c, it is possible to make the color depths of the reflection mode and the transmission mode similar.

Further, in the present embodiment, since the color filter is provided with the colored regions 22a, 22b, 22c having different transmittances T and different wavelength pass bands, the above-mentioned effect is obtained, and thus the above-mentioned effects are obtained. The cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, in this embodiment, since the transflective liquid crystal display device is constructed without providing the transflective film (semitransmissive reflection plate), the transflective film (semitransmissive reflection plate) is provided. Inconveniences such as coloring and reduction in contrast due to are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the coloring property and the contrast.

Further, in the present embodiment, the colored regions 22a, 22b are provided between the color filters 2a, 2b, 2c.
The surface areas of 22b and 22c are substantially equal.

Therefore, it is possible to easily manufacture the color filters as compared with the case where the surface areas of the colored regions are different between the color filters.

Now, a modification of the liquid crystal display device according to the third embodiment will be described. The first modification is a combination of the second embodiment and the fourth embodiment. Specifically, it is as follows.

In the first modification, the colored areas 22a and 22a are formed.
The color balance can be adjusted by adjusting the surface areas of the colored regions 22a, 22b, 22c instead of making the surface areas of b and 22c the same. Further, a color filter having no colored region may be provided.

As a result, in the first modification, the effect of the second embodiment is obtained in addition to the effect of the fourth embodiment.

Next, the second modification will be described. The second modification is a combination of the third embodiment and the fourth embodiment. Specifically, it is as follows.

The colored area 22a in FIG. 8B is formed not by one colored area but by a plurality of colored areas. Similarly, the colored region 22b in FIG. 8B is formed not by one colored region but by a plurality of colored regions. Similarly, the colored area 22c in FIG. 8B is formed not by one colored area but by a plurality of colored areas.

As a result, in the second modification, the effect of the third embodiment is obtained in addition to the effect of the fourth embodiment.

Next, a third modification will be described. This modification is a combination of the second embodiment, the third embodiment and the fourth embodiment. Specifically, it is as follows.

The colored area 22a in FIG. 8B is formed not by one colored area but by a plurality of colored areas. Similarly, the colored region 22b in FIG. 8B is formed not by one colored region but by a plurality of colored regions. Similarly, the colored area 22c in FIG. 8B is formed not by one colored area but by a plurality of colored areas.

In addition, the color filters 2a, 2b, 2c
The color balance can be adjusted by adjusting the total surface area of the colored regions 22a, 22b, and 22c for each. Further, there may be a color filter having no colored region.

As described above, in the third modification, in addition to the effects of the fourth embodiment, the effects of the second and third embodiments are also exhibited.

By the way, in the first embodiment, the second embodiment, the third embodiment, the modification of the third embodiment, the fourth embodiment, or the first to third modifications of the fourth embodiment, The shape of the color filters 2a, 2b, 2c is not limited to a rectangle.

Further, in the first embodiment, the second embodiment, the third embodiment, or the modification of the third embodiment, the shape of the transparent region is not limited to the rectangle.

Further, the fourth embodiment or the fourth embodiment.
In the first to third modified examples, the shape of the colored region is not limited to the rectangle.

In the first embodiment, the second embodiment, the third embodiment, the modification of the third embodiment, the fourth embodiment, or the first to third modifications of the fourth embodiment, The color filters 2a, 2b, 2c are R (red) G (green) B
Although the three primary colors of (blue) light are used, the present invention is not limited to this.

For example, the color filters 2a, 2b, 2c
Can also be the three primary colors of C (cyan) M (magenta) Y (yellow).

In the first embodiment, the second embodiment, the third embodiment, the modification of the third embodiment, the fourth embodiment, or the first to third modifications of the fourth embodiment, One pixel is composed of the three color filters 2a, 2b and 2c, but one pixel is composed of four or more color filters,
You can also use multiple primary colors. In addition, a monochrome filter may be included.

[0361]

According to the liquid crystal display device of the first aspect, when the external light passes through the color filter in the reflection mode, a part of the external light passes through a part of the region having a large transmittance.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color intensity can be made approximately the same in the reflection mode and the transmission mode.

Further, in the color filter, by adjusting the surface area of a part of the region having a large transmittance, or by providing a color filter not having a part of the region having a large transmittance, the reflection mode can be improved. You can adjust the color balance of.

As a result, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

Further, since the above effect is obtained by the simple structure in which the color filter is provided with a part of the region having a large transmittance, the cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the transflective liquid crystal display device is constructed without providing the transflective film (semitransmissive reflection plate),
Inconveniences such as coloring and contrast reduction due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the color developability and the contrast.

The liquid crystal display device according to claim 2 can be easily manufactured as compared with the case where the surface areas of a part of regions having a large transmittance are different between a plurality of and a predetermined number of color filters. .

Further, by providing a part of the region having a large transmittance in a plurality of color filters having different wavelength pass bands, the color depth in the reflection mode and the transmission mode in the plurality of color filters can be increased. Can be about the same.

In the liquid crystal display device according to the third aspect, it is possible to adjust the surface area of a part of the region having a large transmittance in each of the plurality of color filters.

Further, only a predetermined number of color filters can be provided with a partial region having a large transmittance, while a color filter not having a partial region having a large transmittance can be provided.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plural and predetermined number of color filters is provided with a part of the region having a large transmittance, only one color filter is provided with a part of the region having a large transmittance to adjust the surface area thereof. Then, the degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance.

In the liquid crystal display device according to the fourth aspect, since one color filter is provided with a plurality of partial regions having a large transmittance, in the reflection mode, an area outside the partial region having a large transmittance is provided. The number of times light passes can be averaged.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

In the liquid crystal display device according to the fifth aspect, it is possible to easily manufacture the liquid crystal display device as compared with a case where the total surface area of a part of regions having a large transmittance is different between a plurality of and a predetermined number of color filters. You can

Also, by providing a plurality of partial regions having a large transmittance in each of the plurality of color filters having different wavelength pass bands, the plurality of color filters can have different colors in the reflection mode and the transmission mode. The thickness can be made similar.

Further, since each of the color filters is provided with a plurality of partial regions having a large transmittance, the number of times external light passes through the partial regions having a large transmittance in the reflection mode can be averaged. .

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength pass bands is provided with a plurality of regions having a large transmittance, only one color filter has a region having a large transmittance. When plural viewing angles are changed as compared with a case where a plurality of color filters are provided and one area having a large transmittance is provided,
It is possible to further suppress the color change felt by humans.

In the liquid crystal display device according to the sixth aspect, in each of the plurality of color filters, the total surface area of the plurality of partial regions having a large transmittance can be adjusted.

Further, it is possible to provide only a predetermined number of color filters with a part of the region having a large transmittance, while providing a color filter not having a part of the region having a large transmittance.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since a plurality of partial areas having a large transmittance are provided in each of the plurality of and the predetermined number of color filters, a plurality of partial areas having a large transmittance are provided only in one color filter, The degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance by adjusting the total surface area.

Further, since each color filter is provided with a plurality of partial regions having a large transmittance, the number of times external light passes through the partial regions having a large transmittance in the reflection mode can be averaged. .

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in color felt by the human as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength pass bands is provided with a plurality of regions having a large transmittance, only one color filter has a region having a large transmittance. When plural viewing angles are changed as compared with a case where a plurality of color filters are provided and one area having a large transmittance is provided,
It is possible to further suppress the color change felt by humans.

In the liquid crystal display device according to the seventh aspect, the hues of the colors displayed in the transmissive mode and the reflective mode can be made approximately the same.

In the liquid crystal display device according to claim 8, the absorption of light in the reflection mode is further suppressed, the brightness of the reflection mode is further improved, and the color density is made different between the reflection mode and the transmission mode. The effect of being able to do the same is more effectively exhibited.

Further, as compared with the case where a part of the region having a large transmittance is colored to make the transmittance smaller than "1", the manufacturing becomes easier.

In the liquid crystal display device according to claim 9, the color balance in the reflection mode can be adjusted by adjusting the transmittance and the wavelength pass band of a part of the part belonging to the reflection area of the color filter. .

Further, in the color filter, the surface area of a part of the regions having different transmittances and wavelength passbands in a predetermined range is adjusted, and the color filters have different transmittances and wavelength passbands in a predetermined range. The color balance in the reflection mode can also be adjusted by providing a color filter that does not have a part of the area.

Since the color balance can be adjusted as described above, when the hues of the colors displayed in the reflection mode and the transmission mode are different, the difference in the hues can be adjusted.

By adjusting the transmittance and the wavelength passband of a part of the part belonging to the reflection area of the color filter, the waveform representing the transmittance of that part of the area can be adjusted.

With this, the spectral distribution in the reflection mode can be finely controlled. Therefore, compared with the case where the transmittance of a part of the region belonging to the reflective region of the color filter is constant in the visible light region and the waveform representing the transmittance of the partial region cannot be adjusted, The spectral distribution of the mode can be made closer to the spectral distribution of the transmission mode.

As a result, in the reflection mode and the transmission mode,
The color strength can be made similar.

Further, since the color filter is provided with a partial structure having different transmittances and wavelength pass bands in a predetermined range, the above effect can be obtained.
The cost can be reduced as much as possible and the manufacturing can be performed easily.

Further, since the semi-transmissive liquid crystal display device is constructed without providing the semi-transmissive reflection film (semi-transmissive reflection plate),
Inconveniences such as coloring and contrast reduction due to the semi-transmissive reflection film (semi-transmissive reflection plate) are eliminated.

As a result, it is possible to provide a semi-transmissive liquid crystal display device which does not deteriorate the color developability and the contrast.

In the liquid crystal display device according to the tenth aspect, in each of the plurality of color filters, the transmittance and the wavelength pass band of a part of the part belonging to the reflection area can be adjusted.

In this way, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range, only one color filter has a different transmittance and a predetermined range. The degree of freedom in adjusting the color balance is increased as compared with the case where the color balance is adjusted by providing a partial area having a wavelength pass band in the above range.

Further, since the spectral distribution in the reflection mode can be finely controlled in each of the plurality of color filters,
In a plurality of color filters, the reflection mode spectral distribution and the transmission mode spectral distribution can be made close to each other.

As a result, in a plurality of color filters, it is possible to make the color depths of the reflection mode and the transmission mode similar to each other.

In the liquid crystal display device according to the eleventh aspect, when a plurality of and a predetermined number of color filters have different transmittances and surface areas of some regions having a wavelength pass band of a predetermined range. It can be manufactured more easily than

Further, in the plurality of color filters, the surface area of a part of regions having different transmittances and wavelength pass bands of a predetermined range is fixed to a constant value, so that the parameter for adjusting the color balance becomes One less, so you can easily adjust the color balance.

In the liquid crystal display device according to the twelfth aspect, in each of the plurality of color filters, it is possible to adjust the surface area of a part of the regions having different transmittances and wavelength pass bands in a predetermined range.

Also, only a predetermined number of color filters are provided with some regions having different transmittances and wavelength passbands in a predetermined range, while different transmittances and wavelength passbands in a predetermined range are provided. It is possible to provide a color filter that does not have a part of the region that has.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range,
Only one color filter is provided with a partial area having different transmittances and wavelength passbands in a predetermined range,
The degree of freedom in adjusting the color balance is increased as compared with the case where the surface area is adjusted to adjust the color balance.

In the liquid crystal display device according to the thirteenth aspect, since one color filter is provided with a plurality of partial regions having different transmittances and wavelength pass bands in a predetermined range, different transmissions are performed in the reflection mode. The rate and the number of times external light passes through a partial region having a wavelength pass band in a predetermined range can be averaged.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in the color felt by the human as much as possible when the viewing angle is changed.

[0409] In the liquid crystal display device according to the fourteenth aspect, in each of the plurality of color filters, the transmittance and the wavelength pass band of a part of the part belonging to the reflection area can be adjusted.

In this way, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range, only one color filter has a different transmittance and a predetermined range. The degree of freedom in adjusting the color balance is increased as compared with the case where the color balance is adjusted by providing a partial area having a wavelength pass band in the above range.

Further, in each of the plurality of color filters, since the spectral distribution in the reflection mode can be finely controlled,
In a plurality of color filters, the reflection mode spectral distribution and the transmission mode spectral distribution can be made close to each other.

As a result, in a plurality of color filters, it is possible to make the color depths of the reflection mode and the transmission mode similar to each other.

Further, since each of the color filters is provided with a plurality of partial areas having different transmittances and wavelength passbands within a predetermined range, different transmittances and predetermined ranges are provided in the reflection mode. It is possible to average the number of times external light passes through some regions having a wavelength pass band.

As a result, when a human sees the display on the liquid crystal display device, it is possible to suppress the change in color felt by the human as much as possible when the viewing angle is changed.

Since each of the plurality of color filters having different wavelength passbands is provided with a plurality of partial regions having different transmittances and wavelength passbands within a predetermined range, only one color filter is provided. , A plurality of partial regions having different transmittances and wavelength ranges in a predetermined range are provided, and other color filters have some regions having different transmittances and wavelength ranges in a predetermined range. Compared with the case of providing one, when changing the viewing angle,
It is possible to further suppress the color change felt by humans.

In the liquid crystal display device according to the fifteenth aspect, if the plurality of color filters and the predetermined number of color filters are different from each other, the total surface areas of some regions having different transmittances and wavelength pass bands of a predetermined range are different. Compared to the case of
Can be easily manufactured.

In addition, in a plurality of color filters, the total surface area of a part of regions having different transmittances and wavelength pass bands in a predetermined range is fixed to a constant value, so that the color balance is adjusted. Since there is one less parameter, the color balance can be easily adjusted.

According to a sixteenth aspect of the present invention, in each of the plurality of color filters, adjusting the total surface area of a plurality of partial regions having different transmittances and wavelength pass bands in a predetermined range. You can

Further, only a predetermined number of color filters are provided with some regions having different transmittances and wavelength passbands in a predetermined range, while different transmittances and wavelength passbands in a predetermined range are provided. It is possible to provide a color filter that does not have a part of the region that has.

As described above, the color balance in the reflection mode can be adjusted. Moreover, since each of the plurality of and the predetermined number of color filters is provided with a partial region having a different transmittance and a wavelength pass band in a predetermined range,
Only one color filter is provided with a partial area having different transmittances and wavelength passbands in a predetermined range,
The degree of freedom in adjusting the color balance is increased as compared with the case of adjusting the color balance by adjusting the total surface area.

In the liquid crystal display device according to the seventeenth aspect, the hues of the colors displayed in the transmission mode and the reflection mode can be made approximately the same.

In the liquid crystal display device according to the eighteenth aspect, when the external light passes through the color filter in the reflection mode, a part of the external light passes through a part of the region having a large transmittance.

Therefore, the absorption of light in the reflection mode is suppressed, the brightness of the reflection mode is improved, and the color saturation can be made approximately the same in the reflection mode and the transmission mode.

In the liquid crystal display device according to the nineteenth aspect, the light passing through the opening is not absorbed by the color filter, so that the light absorption in the reflection mode is further suppressed and the brightness in the reflection mode is reduced. It is more effective, and the effect that the color intensity can be made substantially the same in the reflection mode and the transmission mode is more effectively exhibited.

[Brief description of drawings]

FIG. 1A is a structural diagram of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 1B is a sectional view taken along line AA of the liquid crystal display device.

FIG. 2 is a diagram showing the relationship between the transmittance T and the wavelength in the transmission mode of the liquid crystal display device.

FIG. 3A is a diagram showing the relationship between the transmittance T # and the wavelength of the reflective region r excluding the transparent region of the liquid crystal display device, and FIG. 3B is a diagram showing the relationship between the transmittance T # and the wavelength of the transparent region of the liquid crystal display device. FIG. 3C is a diagram showing the relationship between the transmittance T # and the wavelength in the reflection mode of the liquid crystal display device.

FIG. 4A is a structural diagram of a liquid crystal display device according to a second embodiment of the present invention, and FIG. 4B is a sectional view taken along line BB of the liquid crystal display device.

FIG. 5 is an explanatory diagram of color balance adjustment in the liquid crystal display device.

FIG. 6A is a structural diagram of a liquid crystal display device according to a third embodiment of the present invention, and FIG. 6B is a sectional view taken along line CC of the liquid crystal display device.

7A is an explanatory diagram of a reflection mode in the liquid crystal display device according to the first embodiment of the present invention, and FIG. 7B is an explanatory diagram of a reflection mode in the liquid crystal display device according to the third embodiment of the present invention.

FIG. 8A is a structural diagram of a liquid crystal display device according to a fourth embodiment of the present invention, and FIG. 8B is a sectional view taken along line DD of the liquid crystal display device.

FIG. 9 is a diagram showing the relationship between the transmittance T and wavelength of a colored region in the liquid crystal display device.

FIG. 10A is a diagram showing the relationship between the transmittance T # and the wavelength of the reflective region r excluding the transparent region of the liquid crystal display device, and FIG. 10B is a diagram showing the relationship between the transmittance T # and the wavelength of the colored region of the liquid crystal display device. FIG. 3C is a diagram showing the relationship between the transmittance T # and the wavelength in the reflection mode of the liquid crystal display device.

FIG. 11 is an explanatory diagram of an effect of the liquid crystal display device.

FIG. 12 is a structural diagram of a conventional liquid crystal display device.

[Explanation of symbols]

1, 5, 50, 54 Polarizing plate 2, 51 Color filter layers 2a, 2b, 2c Color filter 3, 52 Liquid crystal layer 4, 53 Reflector plate 6, 55 Backlight 7, 56 Opening part 20, 20a, 20b, 20c, 21, 21a, 21
b, 23, 23a, 23b, 23c transparent area 22, 22a, 22b, 22c colored area r reflective area t transmissive area

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuichi Ojima             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Ryota Hata             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Shinya Kiuchi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 2H048 BB02 BB07 BB10 BB42                 2H091 FA02Y FA08Y FA14Y FA41Z                       FD04 FD24 LA17

Claims (19)

[Claims] 1. A light source provided in a first layer, a first polarizing means provided in a second layer, a reflecting means provided in a third layer, and a liquid crystal layer provided in a fourth layer. , A color filter layer provided on the fifth layer and corresponding to one pixel, and a second polarizing means provided on the sixth layer, wherein the color filter layer is a reflection region related to display in a reflection mode. And a transmissive region for displaying in a transmissive mode, the reflecting means has an opening, and the opening is at a position facing the transmissive region of the color filter layer through the liquid crystal layer. The color filter layer is formed by planarly arranging a plurality of color filters having different wavelength pass bands, and each of the plurality of color filters is a part belonging to the reflective region and a part belonging to the transmissive region. And has at least In the one color filter, the liquid crystal display device is characterized in that a part of the area belonging to the reflective area has a higher transmittance than the other area of the part belonging to the reflective area. 2. In each of a plurality and a predetermined number of the color filters, a part of the region belonging to the reflective region has a transmittance higher than that of the other region belonging to the reflective region, 2. The liquid crystal display device according to claim 1, wherein the surface areas of the partial regions having a large transmittance are substantially equal between the predetermined number of the color filters. 3. In each of a plurality of and a predetermined number of the color filters, a part of the area belonging to the reflective area has a larger transmittance than the other area of the area belonging to the reflective area, and a large transmission. 2. The liquid crystal display device according to claim 1, wherein the surface area of the partial area having the ratio is determined for each of the color filters. 4. In the color filter, a part of the area belonging to the reflective area has a larger transmissivity than the other area of the part belonging to the reflective area, and a part of the area having a large transmissivity. The liquid crystal display device according to claim 1, wherein a plurality of liquid crystal display devices are provided. 5. In each of a plurality of and a predetermined number of the color filters, a part of the area belonging to the reflective area has a higher transmittance than the other area of the area belonging to the reflective area, and A plurality of the partial regions having a large transmittance are provided in plural, and among the plurality of the predetermined numbers of the color filters, the total surface areas of the partial regions having a large transmittance are substantially equal to each other, Claim 1 characterized by the above.
The described liquid crystal display device. 6. In each of a plurality and a predetermined number of the color filters, a part of the area belonging to the reflective area has a transmittance different from that of the other area belonging to the reflective area, and 2. The liquid crystal according to claim 1, wherein a plurality of partial areas having a large transmittance are provided, and a total surface area of the partial areas having a large transmittance is determined for each color filter. Display device. 7. The color triangle of light output from the reflective area of the color filter layer is output from the transmissive area of the color filter layer in the partial area where the transmissivity of the reflective area of the color filter is high. 7. The liquid crystal display device according to claim 1, having a surface area that approaches a color triangle of light. 8. The liquid crystal display device according to claim 1, wherein the transmittance of the partial region having a large transmittance is substantially “1” in a visible light region. 9. A light source provided in the first layer, a first polarizing means provided in the second layer, a reflecting means provided in the third layer, and a liquid crystal layer provided in the fourth layer. A color filter layer provided in the fifth layer and forming a pixel region corresponding to one pixel, and a second polarizing means provided in the sixth layer, wherein the color filter layer is reflective. A reflective region for displaying a mode and a transmissive region for displaying a transmissive mode, the reflecting means has an opening, and the opening is provided in the color filter layer through the liquid crystal layer. The color filter layer is formed at a position facing a transmission region, and the color filter layer is formed by planarly arranging a plurality of color filters having different wavelength pass bands, and each of the plurality of color filters is a portion belonging to the reflection region. And the part belonging to the transparent area In at least one of the color filters, a part of the area belonging to the reflective area has a different transmittance from the other area of the area belonging to the reflective area, and is predetermined. A liquid crystal display device having a wavelength pass band in a range. 10. In each of a plurality and a predetermined number of the color filters, a part of the area belonging to the reflective area has a different transmittance and a predetermined range from other areas of the area belonging to the reflective area. 10. The liquid crystal display device according to claim 9, wherein the liquid crystal display device has a wavelength pass band of, and the transmittance and the wavelength pass band of a part of the region are determined for each color filter. 11. The surface areas of the partial regions having different transmittances and wavelength pass bands in a predetermined range are substantially equal between the plurality of and the predetermined number of the color filters. The liquid crystal display device according to claim 10, wherein the liquid crystal display device is a liquid crystal display device. 12. The liquid crystal display device according to claim 10, wherein the surface areas of the partial regions having different transmittances and wavelength pass bands within a predetermined range are determined for each color filter. . 13. The part of the part belonging to the reflective area has a different transmittance from the other areas of the part belonging to the reflective area, and has a wavelength pass band in a predetermined range. 10. The liquid crystal display device according to claim 9, wherein the color filter is provided with a plurality of partial regions having different transmittances and wavelength pass bands in a predetermined range. 14. In each of a plurality of and a predetermined number of the color filters, a part of the area belonging to the reflective area has a different transmittance and a predetermined range from other areas of the area belonging to the reflective area. Has a wavelength pass band of
A plurality of partial regions having different transmittances and wavelength passbands in a predetermined range are provided, and the transmittances and wavelength passbands of the partial regions are determined for each color filter. The liquid crystal display device according to claim 9. 15. The sum of the surface areas of the partial regions having different transmittances and wavelength pass bands in a predetermined range is substantially equal between the plurality and the predetermined number of the color filters. 15. The method according to claim 14, wherein
The described liquid crystal display device. 16. The sum of the surface areas of the partial regions having different transmittances and a predetermined range of wavelength passbands,
The liquid crystal display device according to claim 14, wherein the liquid crystal display device is defined for each color filter. 17. The color triangle of the light output from the reflection area of the color filter layer, wherein the partial area having different transmittance and a predetermined wavelength passband in the reflection area of the color filter. 17. The liquid crystal display device according to claim 9, wherein the liquid crystal display device has a transmittance and a wavelength pass band that approach a color triangle of light output from the transmissive region of the color filter layer. 18. The color filter according to claim 1, wherein a part of the area belonging to the reflection area has a different transmittance from the other areas of the area belonging to the reflection area, and has a predetermined wavelength pass band. 10. A portion of the region has a higher transmittance than other regions.
18. The liquid crystal display device according to item 17. 19. The liquid crystal display device according to claim 8, wherein the part of the region having a large transmittance is an opening.