JP2000075278A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a two-ways type liquid crystal display with which a fine quality color picture having sufficient brightness and color density can be displayed both in a reflective mode display using an external light and in a transmissive mode display using an illuminating light from a backlight. SOLUTION: The first colored film layer 11 and the second colored film layer 14 are provided on the front side and on the rear side of a liquid crystal layer 18 respectively. A semitransparent reflection means 17 comprising pixel electrodes 4 is formed between the second colored film layer 14 and the liquid crystal layer 18. A backlight 19 is provided on the rear side of the second colored film layer 14. Each of the fist and the second colored film layers 11, 14 is formed with corresponding red, green, blue color filters 12R, 12G, 12B and 15R, 15G, 15B respectively on each of pixel regions A and color filters with the same color in the first colored film layer 11 and the second colored film layer 14 are made to correspond to the same pixel region A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device which performs both reflective display and transmissive display.

[0002]

2. Description of the Related Art As a liquid crystal display device, a so-called two-way display that performs both a reflection type display using external light such as natural light and room light and a transmission type display using illumination light from a backlight. There are types.

Conventionally, this two-way liquid crystal display device comprises a liquid crystal layer provided between a pair of transparent substrates on the front side and the back side, and a plurality of liquid crystal layers provided on inner surfaces of the pair of substrates and facing each other. , A transparent electrode forming a pixel region of the above, a transflective reflector disposed on the back side of the rear substrate, and a backlight provided on the back side of the transflective plate.

The two-way liquid crystal display device performs a reflective display using external light in a bright environment where external light of sufficient brightness can be obtained, and operates in a dark environment where external light of sufficient brightness cannot be obtained. Performs transmission-type display using illumination light from a backlight, and the backlight is turned on when performing transmission-type display.

That is, in the case of a reflective display utilizing external light, light incident on the liquid crystal display device from the front thereof enters the liquid crystal layer, and light transmitted through the liquid crystal layer is reflected by the semi-transmissive reflector. The light is reflected at a reflectance according to the transmittance characteristic, and the reflected light is transmitted through the liquid crystal layer again and emitted to the front of the liquid crystal display device.

In the case of a transmissive display utilizing illumination light from a backlight, illumination light from the backlight incident on the liquid crystal display device from the rear side passes through the semi-transmissive reflection plate to reflect / transmit the light. The light passes through the liquid crystal layer at a transmittance according to the rate characteristic and enters the liquid crystal layer, and the light passes through the liquid crystal layer and exits in front of the liquid crystal display device.

There are various types of liquid crystal display devices such as a TN (Twisted Nematic) type and a GH (Guest / Host) type, and the light transmittance of each pixel region is set between electrodes. An image is displayed by controlling the change in the alignment state of the liquid crystal molecules according to the applied voltage.

The liquid crystal display device includes a device for displaying a black-and-white image and a device for displaying a color image. In the liquid crystal display device for displaying a multicolor image such as a full-color image, the liquid crystal display device includes a pair of substrates. A colored film of a plurality of colors is provided on the inner surface of one of the above (generally, the front substrate) in correspondence with the plurality of pixel regions.

The colored films of the plurality of colors are, for example, red, green,
It is a color filter of three colors of blue, three colors of red, green and blue
A liquid crystal display device provided with a color filter for colors emits red, green, and blue colored lights colored to the color of the color filter from each pixel region, and displays a full-color image by mixing the colors.

[0010]

However, in a conventional two-way liquid crystal display device provided with a colored film, the number of times light passes through the colored film is different between a reflective display and a transmissive display. In addition, there is a problem that the display quality in the reflective display using external light and the display quality in the transmissive display using the illumination light from the backlight are extremely different.

That is, in a conventional two-way liquid crystal display device provided with a colored film, a colored film is provided on one of the inner surfaces of a pair of substrates, and a semi-transmissive reflection plate is arranged on the rear side of the rear substrate. Since the backlight is provided on the back side of the transflective plate, in the case of a reflective display using external light, light incident on the liquid crystal display device from the front is reflected by the transflective plate. Through the colored film twice before the light is emitted to the front of the liquid crystal display device.

The colored film such as a color filter absorbs light of the wavelength component in the absorption wavelength band of the colored film in the visible light band and transmits light of the wavelength component in the transmitted wavelength band of the colored film. However, the transmittance of the light of the wavelength component in the transmission wavelength band is not 100%, and the light of the wavelength component in the transmission wavelength band is absorbed to some extent.

Therefore, in the case of the above-mentioned reflection type display, the light enters the liquid crystal display device from its front surface, and the light of the wavelength component in the absorption wavelength band is absorbed by the colored film, and the light colored in the color of the colored film is emitted. In the process of being reflected by the semi-transmissive reflection plate and being emitted to the front of the liquid crystal display device, it is again absorbed by the colored film, and colored light having a dark color but extremely dark is emitted from each pixel region.

On the other hand, in the case of a transmissive display using illumination light from a backlight, the number of times of transmission of light through the colored film is only one. Since the light of the wavelength component is absorbed and the light colored in the color of the colored film is emitted to the front of the liquid crystal display device, bright but light colored light is emitted from each pixel region.

For this reason, in the conventional two-way liquid crystal display device provided with a colored film, the display image at the time of reflection type display using light is an image in which the color is dark but the entire screen is dark, and illumination from the backlight is performed. The display image at the time of the transmission type display using light is an image with a bright screen but a light color.

The color intensity and brightness of the emitted light in the reflective display and the transmissive display can be arbitrarily selected by selecting the thickness of the colored film. In the two-way liquid crystal display device, the brightness of the display image in the reflective display can be improved by reducing the thickness of the colored film, but the color of the display image in the transmissive display is extremely thin. In addition, when the thickness of the colored film is increased, the color of the display image in the transmission type display can be increased, but the display image in the reflection type display becomes extremely dark.

The present invention provides a good quality color image with sufficient brightness and color density in both reflective display using external light and transmissive display using illumination light from a backlight. It is an object of the present invention to provide a two-way display type liquid crystal display device capable of displaying the following.

[0018]

A liquid crystal display device according to the present invention comprises a liquid crystal layer provided between a pair of front and rear substrates, and a region provided on the inner surfaces of the pair of substrates and facing each other. An electrode forming a plurality of pixel regions, a first colored film layer provided on the front side of the liquid crystal layer, a second colored film layer provided on the back side of the liquid crystal layer, A semi-transmissive reflection means formed between the first colored film layer and the liquid crystal layer, and a backlight provided on the back side of the second colored film layer. A second colored film layer formed of a plurality of colored films respectively corresponding to the plurality of pixel regions, wherein the first colored film layer and the second colored film layer have the same color; The color films correspond to the same pixel region.

In this liquid crystal display device, a first colored film layer is provided on the front side of the liquid crystal layer, a second colored film layer is provided on the back side of the liquid crystal layer, and the second colored film layer and the A transflective means is formed between the liquid crystal layer and the liquid crystal layer, and a back light is provided on the back side of the second colored film layer. The light incident from the front surface is transmitted through the first colored film layer and the liquid crystal layer, is reflected by the semi-transmissive reflection means, is not transmitted through the second colored film layer, and the liquid crystal layer and the liquid crystal layer are not transmitted. The light passes through the first colored film layer again and is emitted to the front of the liquid crystal display device.

In the case of a transmissive display utilizing illumination light from a backlight, illumination light from the backlight incident from the back side of the liquid crystal display device is transmitted through the second colored film layer and the semi-transmissive light. The light passes through the reflection means, the liquid crystal layer, and the first colored film layer and is emitted to the front of the liquid crystal display device.

In the case of this transmissive display, in this liquid crystal display device, the first colored film layer and the second colored film layer are respectively formed of a plurality of colored films respectively corresponding to the plurality of pixel regions. And the colored films of the same color of the first colored film layer and the second colored film layer correspond to the same pixel region, so that the second colored film layer and the first colored film The light that passes through both of the layers and exits in front of the liquid crystal display device substantially transmits twice through the same colored film layer (either the second colored film layer or the first colored film layer) twice. It is the same as the light.

That is, in this liquid crystal display device, the number of times that light passes through the colored film layer is either a reflection type display using external light or a transmission type display using illumination light from a backlight. Twice each (for the reflective display, the first colored film layer is transmitted twice, and for the transmissive display, the second colored film layer and the first colored film layer are transmitted once each). Therefore, if the luminance of the incident external light in the reflective display is substantially the same as the luminance of the illumination light from the backlight in the transmissive display, the transmissive display is also used in the reflective display. In this case, when the same voltage is applied between the electrodes of both substrates, the color density and brightness of the emitted light are almost the same.

The color intensity and brightness of the emitted light in the reflection type display can be arbitrarily selected by selecting the thickness of the colored film of the first colored film layer.
The color density and brightness of the emitted light at the time of the transmission type display,
The thickness of each colored film of the first colored film layer and the second colored film layer can be arbitrarily selected.

Therefore, according to this liquid crystal display device,
In both the reflective display using external light and the transmissive display using illumination light from the backlight, a good-quality color image with sufficient brightness and color density can be displayed.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, in a liquid crystal display device of the present invention, a first colored film layer is provided on the front side of a liquid crystal layer, and a second colored film layer is provided on the back side of the liquid crystal layer. Forming a semi-transmissive reflection means between the second colored film layer and the liquid crystal layer, providing a backlight on the back side of the second colored film layer, A second colored film layer is formed of a plurality of colored films respectively corresponding to the plurality of pixel regions, and the first colored film layer and the second colored film layer have the same color. Correspond to the same pixel area to provide good quality with sufficient brightness and color density in both reflective display using external light and transmissive display using illumination light from the backlight. In which a color image can be displayed.

In the liquid crystal display device according to the present invention, it is desirable that the same colored film of the first colored film layer and the second colored film layer is formed to have substantially the same thickness. Thereby, the color density and brightness of the colored light transmitted twice through the first colored film layer in the reflective display, and the second colored film layer and the first colored color in the transmissive display The color density and brightness of the colored light transmitted once through the film layer
Can be closer.

In this liquid crystal display device, the first colored film layer is provided on the inner surface of the front substrate, the second colored film layer is provided on the inner surface of the rear substrate, and the inner surface of the rear substrate is provided. Preferably, the electrode is provided on the second colored film layer, and the electrode is formed of a transflective film to constitute the transflective means. The distance from the colored film layer to the transflective means is extremely short, and in the case of a reflective display, light is incident from a direction obliquely inclined with respect to the normal to the front surface of the liquid crystal display device. Most of the reflected light can be emitted from the pixel area where the light has entered.

For this reason, in the case of the reflection type display, light incident on each pixel region and colored in the color of the colored film corresponding to each pixel region of the first colored film layer is transmitted to the semi-transmissive reflection means. In the process of being reflected by and exiting the front of the liquid crystal display device, passing through another pixel region, and minimizing the probability of being absorbed by a colored film of another color corresponding to the pixel region,
The incident external light can be efficiently emitted, and the display in the reflective display can be made brighter.

The transflective means may be formed by providing a transflective film on the outer surface of the rear substrate. In this case, the second colored film may be formed on the rear surface of the transflective film. By providing a layer, in the case of a reflective display, light incident on the liquid crystal display device from the front surface is transmitted only through the first colored film layer and reflected by the semi-transmissive reflection plate, so that the light is projected forward of the liquid crystal display device. In the case of a transmissive display, illumination light from a backlight is transmitted through the semi-transmissive reflection plate and is incident on the liquid crystal display device from the back side, and the light is transmitted to the second colored film layer and the liquid crystal display device. The light can be transmitted through both of the first colored film layers and emitted to the front of the liquid crystal display device.

Further, in this liquid crystal display device, the first colored film layer and the second colored film layer are, for example, the first colored film layer and the second colored film layer.
The colored film layers of the plurality of colors are respectively formed in a shape corresponding to substantially the entire area of each pixel region, and the second colored film layer is formed of at least the colored films of the plurality of colors. Each pixel area is formed in a shape corresponding to the entire area where the illumination light from the backlight is incident.

If the first colored film layer and the second colored film layer have such a configuration, the first color film layer and the second color film layer can be formed from almost the entire area of each pixel region in a reflection type display using external light. In the case of the transmissive display using the illumination light from the backlight by emitting the colored light transmitted twice through the colored film of the colored film layer, the entire region of the pixel region where the illumination light from the backlight is incident. Thus, it is possible to emit colored light that has passed through the colored film of the second colored film layer and the colored film of the first colored film layer once each.

Further, the first colored film layer and the second colored film layer correspond to the first colored film layer and the colored films of the plurality of colors, each corresponding to an area half of the pixel region. And a region corresponding to the other area of the pixel region is formed as a non-colored region that transmits light without coloring, and the second colored film layer is formed of the plurality of colors. A colored film formed in a shape corresponding to the non-colored region of the first colored film layer, and a non-colored region that transmits light without coloring the region corresponding to the colored film of the first colored film layer; The configuration may be as follows.

If the first colored film layer and the second colored film layer are configured as described above, the color film of the first colored film layer in each pixel region can be formed at the time of reflective display. A dark colored light transmitted twice through the colored film is emitted from a corresponding region, and a high-strength non-colored light that is not absorbed by the colored film from a region corresponding to the non-colored region of the first colored film layer. Light is emitted, and bright colored pixels are displayed by the colored light and the high intensity non-colored light.

In the case of the transmissive display, the area corresponding to the colored film of the first colored film layer and the non-colored area of the second colored film layer in each pixel region is shifted from the region corresponding to the color film. Bright colored light transmitted once only through the colored film of the first colored film layer is emitted, corresponding to the colored film of the second colored film layer and the non-colored region of the first colored film layer. The bright colored light transmitted once only through the colored film of the second colored film layer is emitted from the region to be colored, and a bright colored pixel is displayed by the colored light.

In this case, at the time of the reflection type display, the dark colored light transmitted through the colored film of the first colored film layer twice from each pixel region and the absorption by the colored film are reduced. High intensity non-colored light that is not received is emitted, and in the case of transmissive display, bright colored light transmitted once only through the colored film of the first colored film layer from each pixel region, The bright colored light transmitted once only through the colored film of the colored film layer is emitted, but the brightness obtained by averaging both the colored light and the non-colored light respectively emitted from each pixel region in the reflective display is obtained. And the color density, and the average brightness and color density of both the two colored lights respectively emitted from the respective pixel regions in the transmissive display are almost the same. When using a reflective display, the backlight Even when the transmissive display utilizing illumination light et al., May be density of brightness and color displays sufficient good quality color image.

[0036]

FIG. 1 is a sectional view of a part of a liquid crystal display device according to a first embodiment of the present invention.
A plurality of pixel regions A are formed by a liquid crystal layer 18 provided between the pair of transparent substrates 1 and 2 on the front side and the back side, and regions provided on the inner surfaces of the pair of substrates 1 and 2 and facing each other. Electrodes 3, 4; a first colored film layer 11 provided on the front side of the liquid crystal layer 18; a second colored film layer 14 provided on the back side of the liquid crystal layer 18; The light emitting device includes a transflective means 17 formed between the colored film layer 14 and the liquid crystal layer 18 and a backlight 19 provided on the back side of the second colored film layer 14.

Although the backlight 19 is shown in a simplified form in the figure, the backlight 19 has a light source such as a straight tube fluorescent lamp disposed on an end face of a transparent light guide plate, and illuminates the illumination light from the light source. Examples of the light source include a side lamp type surface light source that is guided by the light guide plate and emits light from the front surface thereof, and an EL (electroluminescence) panel.

The liquid crystal display device of this embodiment is of an active matrix type in which a MIM (a two-terminal non-linear resistance element made of a metal-insulating layer-metal laminated film) 5 is an active element. , 2 are provided with a plurality of pixels 4 arranged in a matrix in a row direction (a direction perpendicular to the paper surface in FIG. 1) and a column direction (a horizontal direction in FIG. 1). Electrodes. The electrode 3 provided on the inner surface of the front substrate 1 is
A plurality of opposing electrodes are formed along the column direction corresponding to the pixel electrodes 4 of each column, and a plurality of opposing electrodes are formed by a region where the plurality of pixel electrodes 4 and the plurality of opposing electrodes 3 face each other. A pixel area A is formed.

In this embodiment, the first colored film layer 11 is provided on the inner surface of the front substrate 1, and the plurality of opposing electrodes 3 are provided on the first colored film layer 11 and the back surface. The second colored film layer 14 is provided on the inner surface of the side substrate 2, and the plurality of pixel electrodes 4 and the plurality of MIMs 5 respectively corresponding to the pixel electrodes 4 are provided on the second colored film layer 14. Is provided.

The MIM 5 is formed on the second colored film layer 14.
First made of Al (aluminum) or the like formed on
An insulating layer 7 made of Al ₂ O ₃ or the like generated by anodic oxidation on the entire surface of the first electrode 6;
And a second electrode 8 formed on the insulating layer 7.

The first electrodes 6 of the MIMs 5 in each row are formed integrally with a control signal supply wiring (not shown) provided along the row direction on the second colored film layer 14. The MIM 5 has an off state in which the resistance between the first and second electrodes is maximized in accordance with the voltage of the scanning signal supplied to the wiring, and the resistance between the electrodes is minimized. It is controlled to the ON state.

The plurality of MIMs 5 and the control signal supply wiring are covered with a transparent protective insulating film 9, and the plurality of pixel electrodes 4 are arranged on the protective insulating film 9. Each of these pixel electrodes 4 is formed so as to cover the MIM 5 and the control signal supply wiring by a region on one end side thereof, and the second electrode 8 of the MIM 5 is formed in a contact hole 9 a provided in the protective insulating layer 9. It is connected to the.

In this embodiment, each of the plurality of pixel electrodes 4 is formed of a semi-transmissive reflective film (for example, a porous film of a high-reflectance metal made of an aluminum alloy or the like). The transmission / reflection means 17 is constituted. The counter electrode 3 provided on the inner surface of the front substrate 1 is formed of a transparent conductive film made of ITO or the like.

The first colored film layer 11 provided on the inner surface of the front side substrate 1 has a plurality of colored films corresponding to the plurality of pixel regions A, for example, red, green and blue. It is formed by three color filters 12R, 12G, and 12B, and a light shielding film 13 provided between the color filters 12R, 12G, and 12B of these colors, and provided on the inner surface of the rear substrate 2. Second colored film layer 14
Are red, green, and the same colors as the color filters 12R, 12G, and 12B of the respective colors forming the first colored film layer 11.
Three blue color filters 15R, 15G, 15B;
Each of these color filters 15R, 15G, 15B
It is formed by the light shielding film 16 provided therebetween.

Then, the red color of the first colored film layer 11
Green, blue color filters 12R, 12G, 12B
And the three color filters 15R, 15G, 15B of the second color film layer 14 of red, green, and blue are color filters of the same color, that is, the red filters 12R, 15R, and the green filters 12G, 15G. 15G and the blue filters 12B and 15B are arranged so as to correspond to each other. Therefore, the first colored film layer 11 and the second
The color filters of the same color of the colored film layer 14 correspond to the same pixel region A.

The first and second colored film layers 1
1, 14 red, green and blue color filters 12R,
12G, 12B and 15R, 15G, 15B are each formed of a color resist to which red, green, and blue pigments are added, and the light shielding films 13 and 16 are formed of a black resist to which black pigments are added. .

Of these colored film layers 11 and 14, the light-shielding film 13 of the first colored film layer 11 provided on the inner surface of the front-side substrate 1 is a region between each pixel region A (hereinafter referred to as a pixel). (Referred to as an inter-pixel region), and is formed to have substantially the same width as the inter-pixel region.
Each of the green and blue color filters 12R, 12G, and 12B is formed in a shape corresponding to substantially the entire pixel region A.

The light-shielding film 16 of the second colored film layer 14 provided on the inner surface of the rear substrate 2 is formed from the inter-pixel region to the region covering the MIM 5 and the control signal supply wiring. The red, green, and blue color filters 15R, 15G, and 15B of the second colored film layer 14 are respectively formed over the entire area of the pixel area A other than the area where the light-shielding film 16 is formed, that is, from the backlight 19. It is formed in a shape corresponding to the entire area where the illumination light is incident.

The front substrate 1 and the rear substrate 2
Are joined to each other via a frame-shaped sealing material (not shown) at the outer peripheral edge thereof, and a liquid crystal layer 18 is provided in a region surrounded by the sealing material on the substrates 1 and 2.

The liquid crystal layer 18 is formed of a liquid crystal material in which a nematic liquid crystal having a positive dielectric anisotropy is used as a host liquid crystal, and a black dichroic dye is added to the host liquid crystal. In FIG. 1, reference numeral 18a denotes a host liquid crystal molecule,
Reference numeral 18b denotes a dichroic dye molecule.

That is, the liquid crystal display device of this embodiment has G
H (guest / host) type liquid crystal layer 1
In the absence of an electric field, the liquid crystal molecules 18a and the dye molecules 18b are in a random alignment state (the alignment state of the pixel region A on the left side in FIG. 1) due to the twist alignment of the nematic liquid crystal. Most of the light incident on 18 is absorbed by the dye molecules 18b, and the display becomes almost black and dark.

When a voltage is applied between the electrodes 3 and 4 in each pixel area A, the liquid crystal molecules 18a in the pixel area A rise and align with respect to the substrates 1 and 2 in accordance with the applied voltage.
As a result, the dye molecules 18b rise and orient, and the absorption of light by the dye molecules 18b is reduced.
When the liquid crystal molecules 18a and the dye molecules 18b are almost vertically aligned with respect to the surfaces of the substrates 1 and 2 as in the alignment state of the central pixel region A, light is transmitted through the liquid crystal layer 18 with a high transmittance to display. Is the brightest.

In the liquid crystal display device having the MIM 5 as an active element in this embodiment, the selection period (the period during which the MIM is turned on) is sequentially shifted from the MIM 5 of each row via a control signal supply line (not shown). Display control is performed by supplying a control signal having a waveform in accordance with the image data, and supplying a data signal having a waveform corresponding to the image data to each of the plurality of counter electrodes 3. A voltage corresponding to the data signal is applied between each pixel electrode 4 and the opposing electrode 3 in each column, and a change in the alignment state of the liquid crystal molecules 18a and the dye molecules 18b according to the voltage causes a change from each pixel region A. The intensity of the emitted light is controlled.

This liquid crystal display device performs a reflective display utilizing external light in a bright environment where external light of sufficient brightness can be obtained, and performs a back light display in a dark environment where external light of sufficient brightness cannot be obtained. The transmissive display using illumination light from the light 19 is performed, and the backlight 19 is turned on when performing the transmissive display.

In this liquid crystal display device, the first colored film layer 11 is provided on the front side of the liquid crystal layer 18, and the second colored film layer 14 is provided on the back side of the liquid crystal layer 18. A transflective means 17 was formed between the film layer 14 and the liquid crystal layer 18 by the pixel electrode 4 made of a transflective film, and a backlight 19 was provided on the back side of the second colored film layer 14. Therefore, in the case of a reflection type display using external light, light incident on the liquid crystal display device from the front surface is reflected by the first colored film layer 11 as shown by a path shown by a solid line in FIG. The light passes through the liquid crystal layer 18 and is reflected by the transflective means 17 at a reflectance according to the reflection / transmittance characteristics. The second colored film layer 14 does not transmit, and the liquid crystal layer 18 and the first Through the colored film layer 11 again, and is emitted to the front of the liquid crystal display device.

In the reflection type display, light incident on the liquid crystal display device from the front is first absorbed by the red, green, and blue color filters 12R, 12G, and 12B of the first colored film layer 11 in the absorption wavelength band. Is absorbed to become colored light colored to the colors of the color filters 12R, 12G, and 12B, and the colored light reflected by the transflective means 17 is again applied to the first colored film layer. Since the eleven color filters 12R, 12G, and 12B absorb the light of the wavelength component in the absorption wavelength band and emit the light forward of the liquid crystal display element, colored light having a sufficient color intensity is emitted.

In the case of a transmissive display utilizing the illumination light from the backlight 19, the illumination light from the backlight 19 incident on the liquid crystal display device from the back side is shown by a two-dot chain line in FIG. First, the red, green, and blue color filters 15R, 15G,
15B absorbs the light of the wavelength component in the absorption wavelength band to become colored light colored in the colors of the color filters 15R, 15G, and 15B, and transmits the semi-transmissive reflection means 17 through the transmission according to the reflection / transmittance characteristics. Liquid crystal layer 18
Incident on the liquid crystal layer 18 and transmitted through the liquid crystal layer 18,
Is transmitted by the red, green, and blue color filters 12R, 12G, and 12B of the first colored film layer 11 to absorb light of wavelength components in the absorption wavelength band, and is emitted to the front of the liquid crystal display element. .

In the case of this transmissive display, in this liquid crystal display device, the first colored film layer 11 and the second colored film layer 1
4 and three color filters 12R, 12R of red, green, and blue respectively corresponding to the plurality of pixel regions A.
G, 12B and 15R, 15G, 15B, the first colored film layer 11 and the second colored film layer 14
Of the same color correspond to the same pixel region A, so that the light passes through both the second colored film layer 14 and the first colored film layer 11 and is emitted to the front of the liquid crystal display device. The light is substantially applied to the same colored film layer (the second colored film layer 1).
4 and one of the first colored film layers 11).

That is, in the case of the transmissive display, the light incident on the liquid crystal display device from the back side is first applied to the red, green and blue color filters 15R, 15G, 1 of the second colored film layer 14.
5B absorbs the light of the wavelength component in the absorption wavelength band to become colored light colored in the colors of the color filters 15R, 15G, and 15B, and the colored light transmitted through the semi-transmissive reflection means 17 is converted into a first light. Red, green, blue 1 of the colored film layer 11
Since the light of the wavelength component in the absorption wavelength band is absorbed by the 2R, 12G, and 12B and emitted to the front of the liquid crystal display element, colored light having a sufficient color intensity is emitted also in the transmission type display.

That is, in this liquid crystal display device, the number of times that light passes through the colored film layers 11 and 14 is a transmissive type using illumination light from the backlight 19 even in a reflective display using external light. In the case of display, the first colored film layer 11 is transmitted twice (in the case of reflective display, the first colored film layer 11 is transmitted twice; in the case of transmissive display, the second colored film layer 14 and the first colored film layer 1 are respectively displayed).
1 is transmitted once).

Therefore, if the luminance of the incident external light in the reflective display is substantially the same as the luminance of the illumination light from the backlight 19 in the transmissive display, the transmissive display is also used in the reflective display. When displaying, the electrodes 3 and 4 of both substrates 1 and 2 are also displayed.
The color intensity and brightness of the emitted light when the same voltage is applied in between are almost the same.

In this liquid crystal display device, the first colored film layer 11 is provided with three color filters 12R, 12G, and 12B of red, green, and blue, respectively, in each pixel area A.
And the second colored film layer 14 is formed of three color filters 15R, 15G, and 15B of three colors of red, green, and blue, respectively.
Is formed in a shape corresponding to the whole area of the area where the illumination light from the backlight 19 is incident. Therefore, in the case of the reflective display using the external light, the first area is formed from almost the entire area of each pixel area A. Color filter 12R, 1 of colored film 11
In the case of a transmissive display using the illumination light from the backlight 19 when the colored light transmitted twice through the 2G and 12B is emitted,
The color filters 15R, 15G, and 15B of the second colored film layer 14 and the color filters 12R and 15B of the first colored film layer 11 are viewed from the entire region of each pixel region A where the illumination light from the backlight 19 is incident. The colored light transmitted once through each of 12G and 12B is emitted.

The color intensity and brightness of the emitted light in the reflection type display are arbitrarily selected by selecting the thickness of the color filters 12R, 12G, and 12B of the first colored film layer 11. Further, the color density and brightness of the emitted light in the transmission type display can be adjusted by the color filters 12R, 12G, and 12G of the first color film layer 11 and the second color film layer 14, respectively. 12B and 15R, 15G,
It can be arbitrarily selected by selecting a film thickness of 15B.

Therefore, according to this liquid crystal display device,
In both the reflective display using external light and the transmissive display using illumination light from the backlight, a good-quality color image with sufficient brightness and color density can be displayed.

In this liquid crystal display device, it is desirable that the same color filters of the first colored film layer 11 and the second colored film layer 14 are formed to have substantially the same thickness.
By doing so, the color density and brightness of the colored light transmitted twice through the first colored film layer 11 during the reflective display and the second colored film layer 14 during the transmissive display And the first colored film layer 11 can be made closer in color density and brightness of the colored light transmitted once each.

In this liquid crystal display device, the first colored film layer 11 is provided on the inner surface of the front substrate 1, the second colored film layer 14 is provided on the inner surface of the rear substrate 2, A plurality of pixel electrodes 4 on the inner surface of the side substrate 2 are provided on the second colored film layer 14 and these pixel electrodes 4
Is formed of a semi-transmissive reflective film to constitute the semi-transmissive reflective means 17, so that the distance from the first colored film layer 11 to the semi-transmissive reflective means 17 is extremely short (about several μm). In the case of the reflective display, most of the light incident from a direction oblique to the normal to the front surface of the liquid crystal display device and reflected by the transflective means 17 is emitted from the pixel area A where the light is incident. Can be done.

Therefore, at the time of the reflection type display, the light is incident on each pixel region A, and the color filters 12R, 12G, 12B of the first colored film layer 11 corresponding to the respective pixel regions A are provided.
In the process of being reflected by the semi-transmissive reflection means 17 and emitted to the front of the liquid crystal display device, passes through another pixel region A, and has another color film color corresponding to the pixel region A. The probability of being absorbed by the filters 12R, 12G, and 12G can be minimized, the incident external light can be efficiently emitted, and the display in the reflective display can be made brighter.

FIG. 2 is a sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention. This liquid crystal display device is formed on the second colored film layer 14 in the first embodiment. The plurality of provided MIMs 5 are provided in the same layer as the second colored film layer 14.

That is, the liquid crystal display device of this embodiment is
The plurality of MIMs 5 are provided on the rear substrate 2, and red, green, and blue color filters 15 R, 15 G, and 15 B are provided in regions between the MIMs 5 and control signal supply wiring (not shown) on the rear substrate 2. The second colored film layer 1 is provided by these color filters 15R, 15G, and 15B.
4 is formed.

In this embodiment, a region between each of the MIMs 5 and the control signal supply wiring is a region where the illumination light from the backlight 17 is incident, and the red, green, and blue colors are formed in a shape corresponding to the entire region. Color filters 15R, 15G,
15B, so that the second colored film layer 14 does not have the light-shielding film 16 provided in the first embodiment.

The liquid crystal display device of this embodiment has a plurality of MIMs 5 provided on the same layer as the second colored film layer 14, but the other structure is basically the same as that of the first embodiment. , The same description is given the same reference numerals in the figures and will not be repeated.

According to this liquid crystal display device, the plurality of M
Since the IM5 is provided in the same layer as the second colored film layer 14, the liquid crystal display device can be made thinner than in the first embodiment.

FIG. 3 is a sectional view of a part of a liquid crystal display device according to a third embodiment of the present invention. The liquid crystal display device is provided between a pair of transparent substrates 21 and 22 on the front and back sides. Liquid crystal layer 40 and the pair of substrates 21 and 22
Electrodes 23 and 24 respectively provided on the inner surface of the liquid crystal layer and forming a plurality of pixel regions A ′ by regions facing each other; and a first colored film layer 32 provided on the front side of the liquid crystal layer 40.
A second colored film layer 35 provided on the back side of the liquid crystal layer 40, a semi-transmissive reflecting means 43 formed between the second colored film layer 35 and the liquid crystal layer 40, A backlight (side lamp type surface light source or EL panel or the like) 44 provided on the back side of the second colored film layer 35 is provided.

The liquid crystal display device of this embodiment is of an active matrix type in which a TFT (thin film transistor) 25 is used as an active element.
Of the electrodes 24 provided on the inner surface of the rear substrate 22
Are a plurality of pixel electrodes arranged in a matrix in the row direction (the direction perpendicular to the paper surface in FIG. 3) and the column direction (the horizontal direction in FIG. 3). The electrode 23 provided on the inner surface of the front substrate 21 is a single-film counter electrode corresponding to all of the pixel electrodes 4, and the plurality of pixel electrodes 24 and the counter electrode 23 face each other. A plurality of pixel regions A 'are formed by the regions.

In this embodiment, the front substrate 21
The first colored film layer 32 is provided on the inner surface of the substrate, and the counter electrode 23 is provided on the first colored film layer 32. The counter electrode 23 is formed of a transparent conductive film made of ITO or the like, and an alignment film 38 is provided thereon.

In this embodiment, the plurality of pixel electrodes 24 and the pixel electrodes 2
4 and a plurality of TFTs 25 respectively corresponding to them, an alignment film 39 is formed thereon,
2 is provided with the transflective means 43, and on the outer face of the transflective means 43, the second colored film layer 35 is provided.

The TFT 25 comprises a gate electrode 26 formed on the rear substrate 22 and a gate electrode 26
A gate insulating film (transparent film) 27 provided on substantially the entire surface of the substrate 22 covering the substrate 22; and an i-type semiconductor film 28 formed on the gate insulating film 27 so as to correspond to the gate electrode 26; A source electrode 29 and a drain electrode 30 are formed on both sides of the i-type semiconductor film 28 via an n-type semiconductor film (not shown).

The gate electrode 26 of the TFT 25 in each row
Are formed integrally with gate signal supply wirings (not shown) provided along the row direction (the direction perpendicular to the paper surface in FIG. 3) on the rear substrate 22, and the drains of the TFTs 25 in each column are formed. Each of the electrodes 30 is arranged on the gate insulating film 27 in the column direction (the horizontal direction in FIG. 3).
Are formed integrally with a data signal supply line (not shown) provided along the line. The data signal supply wiring may be formed on the insulating film by covering the TFT 25 with an interlayer insulating film, and may be connected to the drain electrode 30 at a contact hole provided in the interlayer insulating film.

The plurality of TFTs 25 and the data signal supply lines are covered with a transparent protective insulating film 31, and the plurality of pixel electrodes 24 are arranged on the protective insulating film 31. In this embodiment, the pixel electrode 24 is formed so as to be buried in the surface of the protective insulating film 31, and the surface of the pixel electrode 24 is substantially flush with the surface of the protective insulating film 31.

Each of the pixel electrodes 24 has a TFT connection portion 24 a protruding outward from a part of one end thereof, and the TFT connection portion 24 a is provided with a contact hole formed in the protective insulating film 31. 31a, the TFT2
5 is connected to the source electrode 29. Each of the pixel electrodes 24 is formed of a transparent conductive film made of ITO or the like, and an alignment film 39 is provided thereon.

The first colored film layer 32 provided on the inner surface of the front substrate 21 has a plurality of colored films corresponding to the plurality of pixel regions A ′, for example, red, green,
Three blue color filters 33R, 33G, 33B;
The color filters 33R, 33G, 33B of these colors
And the light-shielding film 34 provided between them.
The second colored film layer 35 provided on the outer surface side of the rear substrate 22 includes red, green, and the same colors as the color filters 33R, 33G, and 33B of the respective colors that form the first colored film layer 32. Three blue color filters 36R, 36G, 3
6B and the color filters 36R, 36 of these colors.
It is formed by the light shielding film 37 provided between G and 36B.

Then, the red color of the first colored film layer 32,
Green, blue color filters 33R, 33G, 33B
And the color filters 36R, 36G, 36B of the three colors red, green, and blue of the second colored film layer 35 are color filters of the same color, that is, red filters 33R, 36R, and green filters 33G, 36G. 36G and the blue filters 33B and 36B are arranged so as to correspond to each other. Therefore, the first colored film layer 32 and the second
The color filters of the same color of the colored film layer 35 correspond to the same pixel area A ′.

The first and second colored film layers 3
2,35 red, green, and blue color filters 33R,
33G, 33B and 36R, 36G, 36B are each formed of a color resist to which red, green, and blue pigments are added, and the light shielding films 34 and 37 are formed of a black resist to which black pigments are added. .

Of these colored film layers 32 and 35, the light-shielding film 34 of the first colored film layer 32 provided on the inner surface of the front substrate 1 is provided in each pixel region (pixel electrode except for the TFT connection portion 24a). 24) is formed to have a width substantially equal to the inter-pixel region corresponding to the inter-pixel region between the regions A ′ and the first colored film. Red, green, and blue color filters 33R, 3 of the layer 32
Each of 3G and 33B is formed in a shape corresponding to almost the entire pixel region A '.

The light-shielding film 37 of the second colored film layer 35 provided on the outer surface side of the rear substrate 22 is formed so as to correspond to the inter-pixel region. 35 red, green and blue color filters 36R, 36G, 3
6B, the entire area of the pixel area A 'other than the area where the light shielding film 37 is formed, that is, the backlight 44
Is formed in a shape corresponding to the entire region where the illumination light from the light enters.

In this embodiment, as shown in FIG. 3, the light-shielding film 37 of the second colored film layer 35 is formed to have a width smaller than that of the inter-pixel region.
Are provided in such a manner that one side edge thereof corresponds to one side edge of one of the adjacent pixel electrodes 24, and therefore, the red, green, and blue color filters of the second colored film layer 35 are provided. Each of 36R, 36G, and 36B has an area larger than the pixel area A ', and one side edge thereof corresponds to one side edge of one of the adjacent pixel electrodes 24. .

The front substrate 21 and the rear substrate 22 are joined to each other via a frame-shaped sealing material (not shown) at their outer peripheral edges.
A liquid crystal layer 40 is provided in a region 22 surrounded by the sealing material.

The liquid crystal layer 40 is formed of a nematic liquid crystal having a positive dielectric anisotropy.
a is the respective substrates 21 and 22 formed by the alignment films 38 and 39 provided on the inner surfaces of the pair of substrates 21 and 22 respectively.
The orientation direction in the vicinity of the substrate 2 is regulated and the substrates 21 and
Twist orientation is performed at a predetermined twist angle between the two.

In this embodiment, a pair of substrates 21 and
Polarizing plates 41 and 42 are arranged on the outer surface of the optical disc 22 with their optical axes (transmission axes or absorption axes) directed in predetermined directions.

That is, this liquid crystal display device is of a TN type (twisted nematic). For example, the twist angle of the liquid crystal molecules 40 a of the liquid crystal layer 40 is set to approximately 9
In the case of a normally white mode liquid crystal display device in which the polarizing plates 41 and 42 on the front side and the rear side are arranged with their transmission axes substantially orthogonal to each other, no electric field is applied.
In other words, when the liquid crystal molecules 40a are in the initial twist alignment state (the alignment state of the pixel area A 'on the left side in FIG. 3) in which the liquid crystal molecules 40a are most inclined with respect to the surfaces of the substrates 21 and 22, the display becomes brightest and each pixel area A The display becomes darker as the liquid crystal molecules 40a rise and align with respect to the substrates 21 and 22 by application of a voltage between the electrodes 23 and 24.

In the liquid crystal display device using the TFT 25 of this embodiment as an active element, the selection period (TF) is sequentially applied to the TFT 25 of each row via a gate signal supply line (not shown).
A gate signal having a waveform in which the potential of the TFT 25 is turned on sequentially is supplied, and the TFTs 25 in each column
The display is driven by supplying a data signal having a waveform corresponding to image data via a data signal supply line (not shown). Each pixel electrode 24 and the counter electrode of the row are selected for each selection period of the row. Between 23 and 23, a voltage corresponding to the data signal is applied, and the intensity of light emitted from each pixel region A 'is controlled by changing the alignment state of the liquid crystal molecules 40a according to the voltage.

In this embodiment, the rear substrate 22
A transflective polarizing plate provided with a transflective film (for example, a porous film of a high-reflectance metal made of an aluminum alloy or the like) 43a on the back surface of the rear-side polarizing plate 42 disposed on the outer surface of The transflective means 43 is formed by the transflective film 43a. The front-side polarizing plate 41 disposed on the outer surface of the front-side substrate 21 is a normal polarizing plate.

This liquid crystal display device performs a reflective display utilizing external light in a bright environment where external light of sufficient brightness can be obtained, and performs a backlit display in a dark environment where external light of sufficient brightness cannot be obtained. The transmissive display using illumination light from the light 44 is performed, and the backlight 44 is turned on when performing the transmissive display.

In this liquid crystal display device, a first colored film layer 32 is provided on the front side of the liquid crystal layer 40, a second colored film layer 35 is provided on the back side of the liquid crystal layer 40, and the second colored film layer 35 is provided. Transflective means 43 between the film layer 35 and the liquid crystal layer 40
(Semi-transmissive reflective film 43a formed on the back side of the back-side polarizing plate 42) and the backlight 44 provided on the back side of the second colored film layer 35, so that external light is used. In the case of the reflection type display, light incident on the liquid crystal display device from the front side is reflected by the front side polarizing plate 41, the first colored film layer 32, and the liquid crystal layer 40 along the path shown by the solid line in FIG. The light passes through the rear-side polarizing plate 42 and is reflected by the semi-transmissive reflector 43 at a reflectance according to the reflection / transmittance characteristics, and does not transmit through the second colored film layer 35, and 42
, The liquid crystal layer 40, the first colored film layer 32, and the front-side polarizing plate 41, and are emitted again to the front of the liquid crystal display device.

In the case of this reflection type display, light incident on the liquid crystal display device from the front thereof is first absorbed by the red, green and blue color filters 33R, 33G and 33B of the first colored film layer 32 in the absorption wavelength band. Is absorbed to become colored light colored to the colors of the color filters 33R, 33G, and 33B, and the colored light reflected by the transflective means 43 is again applied to the first colored film layer. The 32 color filters 33R, 33G, and 33B absorb the light of the wavelength component in the absorption wavelength band and emit the light to the front of the liquid crystal display element, so that the colored light with sufficient color intensity is emitted.

In the case of a transmissive display utilizing the illumination light from the backlight 44, the illumination light from the backlight 44 incident on the liquid crystal display device from the back side is indicated by a two-dot chain line in FIG. First, the red, green, and blue color filters 36R, 36G,
The light of the wavelength component in the absorption wavelength band is absorbed by 36B to become colored light colored in the colors of the color filters 36R, 36G, and 36B, and the semi-transmissive reflection means 43 transmits light according to its reflection / transmittance characteristics. At the same time, the light passes through the rear-side polarizing plate 42 and enters the liquid crystal layer 40, and the light transmitted through the liquid crystal layer 40 is transmitted to the red, green, and blue color filters 33R and 33R of the first colored film layer 32. The light of the wavelength component in the absorption wavelength band is absorbed by 33G and 33B, passes through the front-side polarizing plate 41, and is emitted to the front of the liquid crystal display element.

In the case of this transmission type display, in this liquid crystal display device, the first colored film layer 32 and the second colored film layer 3
5 are respectively assigned to three color filters 33R, 33 of red, green, and blue corresponding to the plurality of pixel areas A ', respectively.
G, 33B and 36R, 36G, 36B, the first colored film layer 32 and the second colored film layer 35.
The color filters of the same color correspond to the same pixel region A ', so that the light passes through both the second colored film layer 32 and the first colored film layer 35 and is emitted to the front of the liquid crystal display device. The light that is transmitted is substantially the same as the light that has transmitted twice through the same colored film layer (either the second colored film layer 35 or the first colored film layer 32).

That is, in the case of the transmissive display, the light incident on the liquid crystal display device from the back side firstly receives the red, green and blue color filters 36R, 36G, 3 of the second colored film layer 35.
6B absorbs the light of the wavelength component in the absorption wavelength band to become colored light colored in the colors of the color filters 36R, 36G, and 36B, and the colored light transmitted through the semi-transmissive reflection means 43 becomes the first colored light. Red, green and blue 3 of the colored film layer 32
6R, 36G, and 36B absorb the light of the wavelength component in the absorption wavelength band and emit the light to the front of the liquid crystal display element. Therefore, even in the case of the transmissive display, colored light having a sufficient color density is emitted.

That is, in this liquid crystal display device, the number of times that light passes through the colored film layers 32 and 35 is a transmissive type using illumination light from the backlight 44 even in a reflective display using external light. Also in the case of display, two times each (for the reflective display, the first colored film layer 32 is transmitted twice, and in the case of the transmissive display, the second colored film layer 35 and the first colored film layer 3 are displayed).
2 is transmitted once each time).

Therefore, if the luminance of the incident external light in the reflective display is substantially the same as the luminance of the illumination light from the backlight 44 in the transmissive display, the transmissive display is also used in the reflective display. When displaying, the electrodes 2 on both substrates 21 and 22 are also displayed.
The color density and brightness of the emitted light when the same voltage is applied between 3 and 24 are almost the same.

In this liquid crystal display device, the first colored film layer 32 is provided with three color filters 33R, 33G, and 33B of three colors of red, green, and blue, respectively, so as to cover almost the entire area of each pixel area A '. The second colored film layer 35 is provided with three color filters 36R, 36G, and 36B of red, green, and blue, respectively, and the illumination light from the backlight 44 of each of the pixel regions A '. Is formed in a shape corresponding to the entire area where
At the time of the reflection type display using external light, the color filter 3 of the first colored film 32 is removed from almost the entire area of each pixel area A ′.
The colored light transmitted twice through 3R, 33G, and 33B is emitted,
At the time of transmissive display using illumination light from the backlight 44, the entire area of each pixel area A 'where the illumination light from the backlight 44 is incident (in this embodiment, almost the entire area of the pixel area A') ), The color filters 36R, 36G, 36B of the second colored film layer 35 and the color filters 33R, 33G, 33B of the first colored film layer 32 are
The colored light transmitted each time is emitted.

The color intensity and brightness of the emitted light in the reflective display are arbitrarily selected by selecting the film thicknesses of the color filters 33R, 33G and 33B of the first colored film layer 32. In addition, the color density and brightness of the emitted light in the transmission type display can be adjusted by the color filters 33R, 33G, 33G, 33G, and 33G of the first colored film layer 32 and the second colored film layer 35, respectively. 33B and 36R, 36G,
The thickness can be arbitrarily selected by selecting the film thickness of 36B.

Therefore, according to this liquid crystal display device,
In both the reflective display using external light and the transmissive display using illumination light from the backlight, a good-quality color image with sufficient brightness and color density can be displayed.

In this liquid crystal display device, the color filters of the same color of the first colored film layer 32 and the second colored film layer 35 are desirably formed to have substantially the same thickness.
By doing so, the color density and brightness of the colored light transmitted twice through the first colored film layer 32 in the reflective display and the second colored film layer 35 in the transmissive display And the first colored film layer 32 can be made closer in color density and brightness of the colored light transmitted once each.

FIG. 4 is a sectional view of a part of a liquid crystal display device according to a fourth embodiment of the present invention. This liquid crystal display device is different from the first and second colored film layers 3 in the third embodiment.
Red, green and blue color filters 33 respectively
R, 33G, 33B and 36R, 36G, 36B are formed in a shape corresponding to almost half the area of each pixel area A ', and the area corresponding to the other area of the pixel area A' is colored with light. In this case, a non-colored region is formed so as to allow the light to pass therethrough without being performed.

That is, in this embodiment, the red, green, and blue color filters 33R, 33G,
Each of the first colored film layers 32 has a colorless filter 33W in a region corresponding to another area of the pixel region A '. This region is used as a non-colored region for transmitting light without coloring, and the red, green, and blue color filters 36R, 36 of the second colored film layer 35 are provided.
G, 36B are respectively formed in a shape corresponding to the non-colored area a of the first colored film layer 32, and the second colored film layer 3 is formed.
5, the color filters 33R of the first colored film layer 32,
A colorless filter 36W is provided in an area corresponding to 33G and 33B.
To make this region a non-colored region that transmits light without being colored.

FIGS. 5 and 6 show the color filters 33R and 33R of the first and second colored film layers 32 and 35, respectively.
The example of formation of 33G, 33B and 36R, 36G, 36B and the colorless filters 33W, 36W is shown.

In the example shown in FIG. 5, the pixel area A 'is divided into two parts on the left and right, and the first colored film layer 32 is divided into the color filters 33R, 33G, and 33B as shown in FIG. The colorless filter 33W is formed in a shape corresponding to the right half area of the pixel area A ', and the second colored film layer 35 is formed as shown in FIG. In this example, the color filters 36R, 36G, and 36B are formed in a shape corresponding to the right half area of the pixel area A ', and the colorless filter 36W is formed in a shape corresponding to the left half area of the pixel area A'.

In the example shown in FIG. 6, the pixel area A 'is divided into four parts in the upper, lower, left and right directions, and the first colored film layer 32 is divided into the color filters 33R, 33G, 33B as shown in FIG. ′ Are formed in a shape corresponding to the two lower left and upper right regions, and the colorless filter 33W is formed in a shape corresponding to the other two regions (the upper left and lower right regions) of the pixel region A ′. 2B, the color filters 36R, 36G, and 36B are formed in a shape corresponding to the upper left and lower right regions of the pixel region A ', and the colorless filter 36W is formed as shown in FIG. This is an example in which the area A 'is formed in a shape corresponding to the other two areas (lower left and upper right areas).

In the liquid crystal display of this embodiment, the first and second colored film layers 32 and 35 are configured as described above, but the other configuration is the same as the third configuration shown in FIG. Since the embodiment is the same as that of the first embodiment, the same description is given to the drawings and the same explanation is omitted.

According to the liquid crystal display device of this embodiment, in the case of the reflection type display using external light, the color filters 33R and 3R of the first colored film layer 32 in each pixel area A 'are used.
3G and 33B from the area corresponding to the color filter 3
3R, 33G, and 33B are transmitted twice, and dark colored light is emitted, and the color filters 33R, 33R, 33R, High intensity non-colored light which is not absorbed by 33G and 33B is emitted, and bright colored pixels are displayed by these colored light and high intensity non-colored light.

In the case of a reflection type display using illumination light from the backlight 44, the color filters 33R and 33 of the first colored film layer 32 in each pixel area A 'are used.
G, 33B and the color filters 33R, 33G, 33B of the first colored film layer 32 from the regions corresponding to the non-colored regions (the regions where the colorless filters 36W are formed) of the second colored film layer 35. Is emitted once, and the bright colored light is emitted once, and the color filters 36R, 36G, and 36B of the second colored film layer 35 and the non-colored region of the first colored film layer 32 (the region where the colorless filter 33W is formed) ), Bright colored light transmitted once through only the color filters 36R, 36G, and 36B of the second colored film layer 35 is emitted from the region corresponding to (2), and a bright colored pixel is displayed by the colored light. You.

In this case as well, the first colored film layer 3
2 and the color filters 33R, 33G, 33B and 36R, 36G, 36 of the second colored film layer 35, respectively.
By selecting the film thickness of B, it is possible to arbitrarily select the color density and brightness of the emitted light in the reflective display and the transmissive display.

In this case, in the case of the reflective display, the dark colored light transmitted through the color filters 33R, 33G and 33B of the first colored film layer 32 twice from each pixel region A ', respectively. And the color filter 33R,
High intensity non-colored light that is not absorbed by 33G and 33B is emitted, and in the case of transmissive display, the color filter 3 of the first colored film layer 32 from each pixel region A 'is respectively provided.
3R, 33G, 33B, and the bright colored light transmitted once only, and the color filter 36R,
Although bright colored light transmitted once only through 36G and 36B is emitted, the brightness and the average of both the colored light and the non-colored light respectively emitted from each pixel area A ′ in the reflective display are obtained. The color density and the average brightness and color density of both the two colored lights respectively emitted from the respective pixel areas A ′ in the transmissive display are almost the same, and therefore, the external light is reduced. In both the reflective display and the transmissive display using the illumination light from the backlight, a high-quality color image with sufficient brightness and color density can be displayed.

In this embodiment, the colorless filters 33W and 36W are provided in the non-colored regions of the first and second colored film layers 32 and 35. Department.

The liquid crystal display devices of the first and second embodiments are of an active matrix type using MIM5 as an active element, and the liquid crystal display devices of the third and fourth embodiments are of the TFT 25 type. However, the present invention is not limited to the active matrix type liquid crystal display device, and a plurality of scanning electrodes along the row direction are formed in parallel on the inner surface of one substrate. However, the present invention can also be applied to a simple matrix type liquid crystal display device in which a plurality of signal electrodes extending in the column direction are formed in parallel on the inner surface of the other substrate.

The liquid crystal display devices of the first and second embodiments are of the GH type, but the third and fourth liquid crystal display devices are of the GH type.
Although the liquid crystal display device of the embodiment is of the TN type, the present invention can be applied to other types of liquid crystal display devices such as a liquid crystal display device using a ferroelectric liquid crystal.

In the liquid crystal display devices of the above embodiments,
First and second colored film layers 11, 14 or 32, 35
A plurality of colored films respectively corresponding to each pixel region of
Although three color filters of red, green, and blue are used, these colored films may be, for example, three color filters of cyan, magenta, and yellow, or may be colored films other than the color filters.

[0119]

According to the liquid crystal display device of the present invention, a first colored film layer is provided on the front side of the liquid crystal layer, and a second colored film layer is provided on the back side of the liquid crystal layer. Forming a transflective means between the first color film layer and the liquid crystal layer, providing a backlight on the back side of the second color film layer, and forming the first color film layer and the second color film layer Are respectively formed by a plurality of colored films corresponding to the plurality of pixel regions, and the same colored films of the first colored film layer and the second colored film layer correspond to the same pixel region. Therefore, in both the reflective display using external light and the transmissive display using illumination light from the backlight, a good quality color image with sufficient brightness and color density can be obtained. It can be displayed.

In the liquid crystal display device of the present invention, it is desirable that the same colored film of the first colored film layer and the second colored film layer is formed to have substantially the same film thickness. Thereby, the color density and brightness of the colored light transmitted twice through the first colored film layer in the reflective display, and the second colored film layer and the first colored color in the transmissive display The color density and brightness of the colored light transmitted once through the film layer
Can be closer.

In the liquid crystal display of the present invention,
The first colored film layer is provided on the inner surface of the front substrate, the second colored film layer is provided on the inner surface of the back substrate, and the electrode on the inner surface of the back substrate is provided on the inner surface of the second colored film layer. If the electrode is formed of a semi-transmissive reflective film and the semi-transmissive reflective means is formed, the distance from the first colored film layer to the semi-transmissive reflective means is extremely short, and the reflective type At the time of display, most of the light that has entered from a direction oblique to the normal to the front surface of the liquid crystal display device and has been reflected by the transflective means can be emitted from the pixel area where the light has entered. Therefore, at the time of the reflective display, the light that is incident on each pixel region and is colored in the color of the colored film corresponding to each of the pixel regions of the first colored film layer is reflected by the transflective means. In the process of emitting light to the front of the LCD To minimize the probability of being absorbed by the colored film of another color corresponding to the pixel area, efficiently emit the incident external light, and make the display in the reflective display brighter. it can.

The transflective means may be formed by providing a transflective film on the outer surface of the rear substrate, and in this case, the second colored film may be formed on the rear surface of the transflective film. By providing a layer, in the case of a reflective display, light incident on the liquid crystal display device from the front surface is transmitted only through the first colored film layer and reflected by the semi-transmissive reflection plate, so that the light is projected forward of the liquid crystal display device. In the case of a transmissive display, illumination light from a backlight is transmitted through the semi-transmissive reflection plate and is incident on the liquid crystal display device from the back side, and the light is transmitted to the second colored film layer and the liquid crystal display device. The light can be transmitted through both of the first colored film layers and emitted to the front of the liquid crystal display device.

Further, in the liquid crystal display device of the present invention, the plurality of colored films are formed in a shape corresponding to substantially the whole area of each pixel region, and the second colored film layer is formed of the plurality of colored films. If the color film is formed in a shape corresponding to the entire area of the area where the illumination light from the backlight of at least each of the pixel areas is incident,
At the time of reflective display using external light, colored light transmitted twice through the colored film of the first colored film layer is emitted from almost the entire area of each pixel region, and transmitted using illumination light from a backlight. At the time of the type display, the colored film of the second colored film layer and the colored film of the first colored film layer are once applied from the entire region of each pixel region where the illumination light from the backlight is incident. The transmitted colored light can be emitted.

Further, the first colored film layer is formed such that the colored films of the plurality of colors are formed in a shape corresponding to substantially half the area of the pixel region, respectively, and correspond to the other area of the pixel region. The second colored film layer is formed as a non-colored region that transmits light without coloring, and the second colored film layer is formed as a non-colored region of the first colored film layer. If the area corresponding to the colored film of the first colored film layer is formed as a non-colored area for transmitting light without coloring, each pixel area is formed in the reflective display mode. Out of the region corresponding to the colored film of the first colored film layer, the dark colored light transmitted twice through the colored film is emitted, and the region corresponding to the non-colored region of the first colored film layer High intensity non-colored light that is not absorbed by the colored film A bright colored pixel is displayed by the colored light and the high intensity non-colored light. In the case of the transmissive display, the colored film of the first colored film layer and the second colored The bright colored light that has transmitted only once through the colored film of the first colored film layer is emitted from the region corresponding to the non-colored region of the colored film layer, and the colored film of the second colored film layer And bright colored light transmitted only once through the colored film of the second colored film layer is emitted from a region corresponding to the non-colored region of the first colored film layer, and Since bright colored pixels are displayed, the brightness and color density are of sufficient quality in both reflective display using external light and transmissive display using illumination light from the backlight. A color image can be displayed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a part of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a part of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a part of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing an example of forming a color filter and a colorless filter of first and second colored film layers in a fourth embodiment.

FIG. 6 is a diagram showing another example of forming a color filter and a colorless filter of the first and second colored film layers in the fourth embodiment.

[Explanation of symbols]

 Reference numerals 1, 2, substrate A, pixel region 3, counter electrode 4, pixel electrode (semi-transmissive reflection film) 6, MIM 11, first colored film layer 12R, 12G, 12B, color filter 13, light shielding film 14, second Coloring layer 15R, 15G, 15B Color filter 16 Light shielding film 17 Transflective means 18 Liquid crystal layer 19 Backlight 21, 22 Substrate A 'Pixel region 23 Counter electrode 24 Pixel electrode 25 TFT 32: First colored film layer 33R, 33G, 33B: Color filter 34: Light shielding film 35: Second colored film layer 36R, 36G, 36B: Color filter 36W: Colorless filter (non-colored area) 37: Light shielding film 38, 39 ... Alignment film 40 ... Liquid crystal layer 41, 42 ... Polarizing plate 43 ... Semi-transmissive reflection means 43a ... Semi-transmissive reflection film 44 ... Backlight

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H088 EA02 HA08 HA12 HA14 HA18 HA22 HA28 JA05 JA06 JA19 KA11 MA04 2H091 FA02Y FA15Y FA23Z FA35Y FA41Z FA44Z FB08 FC05 FD04 GA13 HA07 HA08 HA12 KA03 LA15 LA17 LA18

Claims (6)

[Claims] A liquid crystal layer provided between a pair of substrates on a front side and a back side; electrodes provided on inner surfaces of the pair of substrates and forming a plurality of pixel regions by regions facing each other; A first colored film layer provided on the front side of the liquid crystal layer, a second colored film layer provided on the back side of the liquid crystal layer, and between the second colored film layer and the liquid crystal layer. And a backlight provided on the back side of the second colored film layer, wherein the first colored film layer and the second colored film layer are each provided with a plurality of Are formed by a plurality of colored films corresponding to the pixel regions, respectively, and the colored films of the same color of the first colored film layer and the second colored film layer correspond to the same pixel region. A liquid crystal display device characterized by the above-mentioned. 2. The liquid crystal display according to claim 1, wherein the same colored films of the first colored film layer and the second colored film layer are formed to have substantially the same thickness. apparatus. 3. The first colored film layer is provided on an inner surface of a front substrate, the second colored film layer is provided on an inner surface of a back substrate, and the electrode on the inner surface of the back substrate is provided. 2. A liquid crystal display device according to claim 1, wherein said electrode is formed on said second colored film layer, and said electrode is formed of a semi-transmissive reflection film to constitute said semi-transmissive reflection means. . 4. The transflective means comprises a transflective film provided on an outer surface of a rear substrate, and the second colored film layer is provided on the back side of the transflective film. The liquid crystal display device according to claim 1, wherein 5. A color film of a plurality of colors of the first color film layer is formed in a shape corresponding to substantially the entirety of the pixel region, and a color film of a plurality of colors of the second color film layer is The liquid crystal display device according to any one of claims 1 to 4, wherein the liquid crystal display device is formed in a shape corresponding to at least an entire region of the pixel region where the illumination light from the backlight is incident. 6. The color film of a plurality of colors of the first color film layer is formed in a shape corresponding to an area approximately half of the pixel region, and the color region of the pixel region of the first color film layer is formed. A region corresponding to the other area region is a non-colored region that transmits light without coloring, and the colored films of the plurality of colors of the second colored film layer are the same as those of the first colored film layer. The region corresponding to the colored film of the first colored film layer of the second colored film layer is formed in a shape corresponding to the non-colored region,
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a non-colored region through which light is transmitted without being colored.