JPH11305248A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device enabling a viewer to easily observe its display in both of a bright place and a dark place and having high display quality generating no difference in display colors. SOLUTION: Pixel electrodes 2, 6 are respectively formed on an electrode substrate 8 and the other electrode substrate which are oppositely arranged through a liquid crystal(LC) layer so as to intersect with each other at right angles at the time of observing them from a direction vertical to the surface of the substrate 8 and a pixel to be a display unit is formed in each intersecting part between both the pixel electrodes 2, 6. The pixel electrode 6 has a transparent electrode part 6a consisting of a transparent electrode film of ITO or the like and a reflection electrode part 6b consisting of a reflection electrode film of aluminium or the like which are electrically connected to one pixel area (an area surrounded by a broken line G in the shown caption).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having both functions of a reflection type and a transmission type.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have low power consumption.
Personal computer,
It is used for display applications such as word processors, office automation terminal displays, and televisions. In particular, it is considered that a liquid crystal display device will be frequently used for portable information terminals in the future.

At present, liquid crystal display devices for portable information terminals are of a reflection type (a device in which natural light is incident from the front side of the panel and emitted to the front side) and a transmission type (light of a backlight in which light from the backlight is incident from the back side of the panel). Which emits light to the front side).

In a transmissive liquid crystal display device having a backlight on the back of the panel, a light source is provided even in a dark place, so that the transmittance of white display is high, the contrast is high, and the display is easy to see. However, since the backlight is used, there is a problem that power consumption is increased. Moreover,
Further, in a bright place, the reflected light becomes brighter than the brightness of the backlight, making it difficult to see. It becomes almost invisible under sunlight.

On the other hand, in a reflection type liquid crystal display device using external light, the reflectance of white display is high in a bright place, the contrast is high, and the display is easy to see. In addition, power consumption is low because no backlight is used. However, in a dark place, since there is no light source, the reflectivity of white display is low, making it difficult to see, and further darkening makes it invisible.

In recent years, liquid crystal display devices, such as portable information terminals, have been rapidly becoming portable, and the environment in which the liquid crystal display devices are used (bright places, dark places) has become unsteady. Therefore, there is a need for a liquid crystal display device that is compatible with both bright and dark environments, such as a combination of a reflection type and a transmission type.

Heretofore, a transflective liquid crystal display device has been proposed as a liquid crystal display device combining a reflection type and a transmission type. This is a transmissive liquid crystal display device in which a transflective plate such as a magic mirror is disposed between a liquid crystal display element (panel) and an illuminating means on the back thereof. The main part of this transflector is
For example, it is composed of a diffusion plate such as a semi-transparent plastic sheet, and further a network-like metal reflection film provided thereon (prior art).

Accordingly, in a bright lighting environment,
The display is performed by reflecting external light such as indoor lighting with the above-mentioned semi-transmissive reflection plate without turning on the illumination means on the back surface such as a backlight. That is, in this case, it is a reflection type in which the above-described external light is used as reflected illumination. On the other hand, in a dark lighting environment, the display is performed by turning on the lighting means on the back. In other words, in this case, the light-transmitting type is a transmissive type in which light from the above-mentioned illuminating means that passes through the transflective plate is used.

In addition to the above, for example, Japanese Patent Application Laid-Open No. 7-33
Japanese Patent No. 3598 discloses a configuration in which a pixel electrode provided on a substrate on a rear surface side opposite to a display surface side of a panel also serves as a semi-transmissive film (prior art).

[0010]

However, since all of the above-mentioned prior arts use a semi-transmissive reflector or a semi-transmissive film, when they are used as a transmissive type (transmissive mode), the transmissivity of white display is reduced. When used as a reflective type (reflection mode) due to a decrease in contrast due to a decrease in the rate,
The contrast is reduced due to a decrease in the reflectance of white display, and the visibility is inferior to that of a normal reflective or transmissive liquid crystal display device.

When color display is supported by using a color filter, the number of times light passes through the color filter is
Since the transmission mode (once) and the reflection mode (once) are different from each other, there is a difference in coloring depending on the mode, and the appearance is different.

The present invention solves the above problems,
Its purpose is to provide a liquid crystal display device that is easy to see in a light place or a dark place and has low power consumption.A further purpose is a high-quality liquid crystal display that has no difference in display colors in a light place and a dark place. It is to provide a device.

[0013]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween. In a liquid crystal display device in which an electrode layer for applying a voltage to the liquid crystal layer is formed on each of opposing surfaces of these transparent substrates, one pixel serving as a display unit in the electrode layer formed on one of the transparent substrates A reflective electrode portion for reflecting light in the region,
And a transparent electrode portion that transmits light.

According to this, two types of electrodes, a transparent electrode portion and a reflective electrode portion, are formed in one pixel region serving as a display unit. Therefore, in a dark place, by illuminating the illuminating means on the rear surface and performing display using the transparent electrode portion, the transmittance of white display is increased, and a display with high contrast and easy to see is obtained. On the other hand, in a bright place, by performing display using the reflective electrode portion without turning on the illumination means on the rear surface, the transmittance of white display is increased, and a high-contrast display that is easy to see is obtained. Power consumption.

According to a second aspect of the present invention, there is provided a liquid crystal display device having a pair of transparent substrates disposed to face each other with a liquid crystal layer interposed therebetween. In a liquid crystal display device in which an electrode layer for applying a voltage to the liquid crystal layer is formed on a surface, light is reflected to one pixel region serving as a display unit in the electrode layer formed on one of the transparent substrates. And a transparent electrode portion that transmits light, and the reflective electrode portion and the transparent electrode portion are electrically independent.

According to this, similarly to the liquid crystal display device according to the first aspect, since two types of electrodes, a reflective electrode portion and a transparent electrode portion, are formed in one pixel region, a bright place even in a dark place. However, a high-contrast, easy-to-view display can be realized.

Moreover, in this case, the reflective electrode portion and the transparent electrode portion constituting one pixel are electrically independent. That is, one pixel is composed of a sub-pixel composed of a reflective electrode part and a sub-pixel composed of a transparent electrode part. Therefore, when used as a transmission type (transmission mode), it is possible to apply a signal only to the transparent electrode portion, and when used as a reflection type (reflection mode), it is possible to apply a signal only to the reflection electrode portion. A liquid crystal display device with lower power consumption can be obtained.

According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, a color filter for performing color display is provided between the pair of transparent substrates. The color tone of the filter is different between the transparent electrode portion and the reflective electrode portion.

According to this, since the color tone of the color filter is changed on the transparent electrode portion and the reflective electrode portion, the transmission mode (1) depends on the number of times light passes through the color filter.
And the reflection mode (twice) can correct the difference in appearance, and the same display color is obtained in both the transmission mode and the reflection mode.

According to a fourth aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the area ratio between the reflective electrode portion and the transparent electrode portion in one pixel region is 2: 8.
To 8: 2.

According to this, since the area ratio between the reflective electrode portion and the transparent electrode portion in one pixel region is set as described above, the visibility is improved in both the transmission mode and the reflection mode.

According to a fifth aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the reflective electrode portion and the transparent electrode portion in each pixel are different types of electrode portions between adjacent pixels. It is characterized by being adjacent to.

According to this, since the transparent electrode portion and the reflective electrode portion in each pixel are not continuous vertically and horizontally, vertical stripes and horizontal stripes do not appear at the time of display, and display with high display quality is realized.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described with reference to FIGS.
It is as follows.

As shown in FIG. 2, the reflective / transmissive liquid crystal display device according to the present embodiment has a simple matrix type liquid crystal display panel 1 and a backlight 9 provided on the back surface thereof. doing.

As shown in FIG. 2, the liquid crystal display panel 1
In this configuration, a liquid crystal layer 3 made of TN (twisted nematic) liquid crystal is sandwiched between a pair of electrode substrates 4 and 8.

In the electrode substrate 4 on the display surface side, a color filter (not shown) is formed on the surface of the glass substrate (transparent substrate) 5 on the liquid crystal layer 3 side.
It has a pixel electrode (electrode layer) 2 in the form of a transparent stripe made of a transparent electrode film such as ndium tin oxide. Also,
The electrode substrate 8 on the back side has a stripe-shaped pixel electrode (electrode layer) 6 formed on the surface of the glass substrate 5 on the liquid crystal layer 3 side.

The pixel electrodes 2 and 6 are formed so as to be orthogonal to each other when viewed from a direction perpendicular to the substrate surface, and a pixel serving as a display unit is formed at the intersection of the two pixel electrodes 2.6. ing. The pixels are arranged in a matrix on the entire liquid crystal display panel 1.

FIG. 1A is a plan view of the electrode substrate 8 in the liquid crystal display panel 1, and FIG. 1B is a cross-sectional view thereof (a cross-sectional view taken along the line AA '). As shown in FIGS. 1A and 1B, the pixel electrode 6 is formed of a transparent electrode film such as ITO which is electrically connected to one pixel region (a region surrounded by a broken line G in the drawing). A transparent electrode portion 6a and a reflective electrode portion 6b made of a reflective electrode film such as aluminum (FIG. 1A)
).

The transparent electrode portion 6a and the reflective electrode portion 6b are arranged so that the reflective electrode portion 6b and the transparent electrode portion 6a are adjacent to each other between adjacent pixels. , And the reflective electrode portions 6b are formed so as not to be continuous vertically and horizontally.

The electrode substrate 8 is formed, for example, by laminating a transparent electrode film made of ITO or the like on a glass substrate 5 by sputtering or the like, patterning this, and forming a transparent electrode portion 6a in the pixel electrode 6, And a reflective electrode film made of Al or the like is laminated and patterned to form a reflective electrode portion 6b.

FIG. 3 shows a color filter 7 provided on the electrode substrate 4 in the liquid crystal display panel 1. The color filter 7 includes a first color filter 7a and a second color filter 7b that face the transparent electrode portion 6a and the reflective electrode portion 6b of the pixel electrode 6, respectively, when the color filter 7 is arranged to face the electrode substrate 8. The first color filter 7a and the second color filter 7b are different in chromaticity of a single color filter corresponding to RGB.

The chromaticity diagram of the XYZ color system shown in FIG.
(1 chromaticity diagram) shows the chromaticity of the first color filter 7a and the second color filter 7b. The chromaticity a indicated by the dashed line is that of the first color filter 7a corresponding to the transparent electrode portion 6a, and the chromaticity b indicated by the broken line is the reflection electrode portion 6b.
Of the second color filter 7b corresponding to.

In the case of the first color filter 7a, the chromaticity when incorporated in the liquid crystal display device is only one time when the transmitted light is incident in the transmission mode, so that the dashed line is the same as the chromaticity of the single unit. In the case of the second color filter 7b, the transmitted light and the reflected light enter in the reflection mode, so that the light passes through the second color filter 7b twice. For this reason, the second color filter 7
The chromaticity of b is not the chromaticity a but set to the chromaticity b indicated by a broken line, which becomes the same color display as the same one-pass transmission mode when the light passes twice.

In the liquid crystal display device of this embodiment having such a configuration, since the transparent electrode portion 6a and the reflective electrode portion 6b are provided in one pixel region, the liquid crystal display device is set to the transmission mode in a dark place, and the backlight is used. 9 is turned on, and backlight is transmitted through the transparent electrode portion 6a of the pixel electrode 6 to perform display. On the other hand, in a bright place, the reflection mode is set so that the consumption electrode is small, and display is performed by reflecting external light on the reflection electrode portion 6b of the pixel electrode 6.

Unlike the conventional transflective liquid crystal display device, the above-mentioned liquid crystal display device does not use a transflective film or a transflective reflector, and therefore has a configuration using these (a liquid crystal display panel is simple). Compared to the matrix type, a display in a dark place has a higher transmittance of white display and a higher contrast, so that an easy-to-view display is obtained, and the visibility is equivalent to that of a conventional transmission type liquid crystal display device. Also, in the display in a bright place, the reflectance of the white display is increased and the contrast is increased, so that an easy-to-view display is obtained, and the visibility is the same as that of the conventional reflection type liquid crystal display device.

The reflection electrode portion 6b in the above one pixel area
By setting the area ratio of the transparent electrode portion 6a to 2: 8 to 8: 2, a panel with good visibility in both the transmission mode and the reflection mode can be obtained.

The color filter 7 includes first and second color filters 7a and 7b having respective chromaticities set corresponding to the transparent electrode portion 6a and the reflective electrode portion 6b of the pixel electrode 6. Therefore, even if the number of times of transmission through the color filter 7 is different between the reflection mode and the transmission mode,
The display color of each mode becomes equal.

Further, in the above configuration, the pixel electrode 6
Since the transparent electrode portion 6a and the reflective electrode portion 6b are formed so as not to be continuous vertically and horizontally, vertical stripes and horizontal stripes do not appear at the time of display, and display with high display quality is realized. On the other hand, the transparent electrode portion 6a of the pixel electrode 6
If the reflection electrode portion 6b and the reflection electrode portion 6b are continuous in one direction, vertical stripes and horizontal stripes due to the cycle appear on the display, and the display quality is degraded.

In the configuration in which the transparent electrode portion 6a and the reflective electrode portion 6b are formed in one pixel region as described above, a normal transmission type or reflective type in which only one transparent electrode or only a reflective electrode is provided in one pixel region. Although the aperture ratio is lower than that of the liquid crystal display device of the above, the adoption of the simple matrix type liquid crystal display panel 1 having a high aperture ratio makes it possible to realize a bright high-contrast display while minimizing the reduction of the pixel area. .

In this embodiment, as shown in FIG. 1B, the reflective electrode portion 6b of the pixel electrode 6 is formed in the same layer as the transparent electrode portion 6a. As shown in FIG. 5, a transparent electrode film 50 forming the transparent electrode portion 6a is formed.
May be formed up to the formation region of the reflective electrode portion 6b, and the reflective electrode portion 6b may be formed on the reflective electrode portion 6b. With such a configuration, even if the reflective electrode film forming the reflective electrode portion 6b has a defect or the like, disconnection is prevented in the lower transparent electrode film 50, and the resistance value of the pixel electrode 6 is reduced. be able to.

In the TN mode using TN liquid crystal for the liquid crystal layer 3, it is necessary to dispose two polarizing plates so as to sandwich the liquid crystal display panel 1, but the polymer dispersed liquid crystal ( By using a mode that does not require a polarizing plate such as a PDLC) or a guest / host, light loss due to the polarizing plate can be eliminated, and a bright high-quality display with white display close to paper white can be realized.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

As shown in FIG. 5, the liquid crystal display device according to the present embodiment, which is a reflection type and a transmission type, has an active matrix type liquid crystal using a two-terminal switching element for each pixel as a liquid crystal display panel. The configuration includes a display panel 10. Here, MIM (Meta
l-Insulater-Metal) element is used.

The liquid crystal display panel 10 has a configuration in which a liquid crystal layer 3 made of TN liquid crystal or the like is sandwiched between a counter substrate 11 and an active matrix substrate 12.

The counter substrate 11 on the display surface side is provided with a color filter (not shown) on the surface of the glass substrate 5 on the liquid crystal layer 3 side.
Is formed thereon, and a transparent stripe-shaped counter electrode 13 made of a transparent electrode film such as ITO is formed thereon. On the other hand, the active matrix substrate 12 on the back side is provided with the above-described counter electrode 13 on the surface of the glass substrate 5 on the side of the liquid crystal layer 3.
The signal wiring 15 is formed in a direction orthogonal to the MIM.
The element 16 and the pixel electrode 14 are formed. A pixel serving as a display unit includes the pixel electrode 14 and the counter electrode 13.
, And the pixels are arranged in a matrix in the entire liquid crystal display panel 10.

FIG. 6A is a plan view of the active matrix substrate 12 in the liquid crystal display panel 10, and FIG. 6B is a cross-sectional view thereof (a cross-sectional view taken along the line BB '). As shown in FIGS. 6A and 6B, the pixel electrode 14
Is a transparent electrode portion 14a made of a transparent electrode film such as ITO and a reflective electrode portion 14b made of a reflective electrode film such as Al, which are electrically connected to one pixel region (a region surrounded by a broken line G in the figure). (The hatched portion in FIG. 6A). Here, the area ratio between the reflective electrode portion 14b and the transparent electrode portion 14a in one pixel region is set between 2: 8 and 8: 2. Thus, a panel with good visibility in both the transmission mode and the reflection mode can be obtained. As described above, the transparent electrode portion 14a and the reflective electrode portion 14b are also formed so as not to be continuous vertically and horizontally in order to avoid a stripe pattern at the time of display.

Such an active matrix substrate 12
One manufacturing method will be described. First, a tantalum thin film serving as the signal wiring 15 and the lower electrode 17 is laminated on the glass substrate 5 by a sputtering method or the like to a thickness of 3000 mm.
It is patterned into a predetermined shape by photolithography to form the signal wiring 15 and the lower electrode 17. afterwards,
The surface of the lower electrode 17 is anodized by anodic oxidation to form an insulating film 18 of tantalum pentoxide having a thickness of 600 °. Next, a titanium film having a thickness of 4000 is formed on the entire surface of the substrate in this state by sputtering or the like.
The upper electrode 19 is formed by patterning into a predetermined shape by photolithography.

Further, a transparent electrode film made of ITO or the like is laminated by a sputtering method or the like, and this is patterned to form a transparent electrode portion 14a. Next, a reflective electrode film made of Al or the like is laminated and patterned to form a reflective electrode portion 14b.

The color filter provided on the opposite substrate 11 of the liquid crystal display panel 10 also has a color filter 7 (see FIG. 3) of the liquid crystal display panel 1 for matching the color tone between the reflection mode and the transmission mode. Similarly, the transparent electrode portion 14a of the pixel electrode 14 and the reflective electrode portion 1
First color filter 7 whose chromaticity is set corresponding to 4b
a and the second color filter 7b.

In the liquid crystal display device of the present embodiment having such a configuration, since the transparent electrode portion 14a and the reflective electrode portion 14b are provided in one pixel region, the liquid crystal display device is set to the transmission mode in a dark place, and the backlight is used. 9 is turned on, and the backlight is transmitted through the transparent electrode portion 14a of the pixel electrode 14 to perform display. On the other hand, in a bright place, a reflection mode is set, and the reflection at the pixel electrode 14 is performed without turning on the backlight 9. Display is performed by reflecting external light on the electrode portion 14b.

As in the liquid crystal display device of the first embodiment, since a transflective film or a transflective plate is not used, a configuration using these is used (the liquid crystal display panel is an active matrix type using MIM elements). In contrast, in the display in a dark place, the transmittance of white display is increased, the contrast is increased, and a display that is easy to see is obtained, and the visibility is the same as that of a conventional transmissive liquid crystal display device. In addition, indication in light place,
The reflectivity of the white display is increased, the contrast is increased, and an easy-to-view display is obtained, and the visibility is the same as that of a conventional reflective liquid crystal display device.

Further, in the liquid crystal display device of the present embodiment,
Since the active matrix type liquid crystal display panel 10 using the two-terminal element is used, in addition to the high switching performance and the high contrast, even if the aperture ratio is reduced as described above, the reduction in the pixel area is minimized. And a bright, high-contrast display can be realized.

In this embodiment, as shown in FIG. 6B, the reflective electrode portion 14b of the pixel electrode 14 is formed in the same layer as the transparent electrode portion 14a. For the same reason as described above, the transparent electrode film 50 forming the transparent electrode portion 14a is formed up to the formation region of the reflective electrode portion 14b as shown in FIG. It is desirable to adopt a configuration in which it is formed so as to overlap.

Also in this embodiment, by using a mode such as a polymer-dispersed liquid crystal or a guest / host which does not require a polarizing plate in the liquid crystal layer 3, a bright high display quality in which white display is close to paper white can be realized. .

Third Embodiment Another embodiment according to the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

As shown in FIG. 7, the liquid crystal display device for both liquid reflection type and transmission type according to the present embodiment is an active matrix type liquid crystal display panel using a three-terminal switching element for each pixel as a liquid crystal display panel. The configuration includes a liquid crystal display panel 20. Here, a TFT (Th
in Film Transistor) element.

The liquid crystal display panel 20 has a configuration in which a liquid crystal layer 3 made of TN liquid crystal or the like is sandwiched between a counter substrate 21 and an active matrix substrate 22.

The opposite substrate 21 on the display surface side is provided with a color filter (not shown) on the surface of the glass substrate 5 on the liquid crystal layer 3 side.
Is formed, and a transparent common counter electrode 23 made of a transparent electrode film such as ITO is formed thereon. On the other hand, the active matrix substrate 22 on the back side is a glass substrate 5
A scanning line 26 and a signal line 27 which are orthogonal to each other are formed on the surface of the liquid crystal layer 3 side.
7, a TFT element 25 and a pixel electrode 24 are formed. Pixels serving as display units are formed at intersections between the pixel electrodes 24 and the counter electrodes 23, and the pixels are arranged in a matrix on the entire liquid crystal display panel 20.

FIG. 8A is a plan view of the active matrix substrate 22 in the liquid crystal display panel 20, and FIG. 8B is a sectional view thereof (a sectional view taken along line CC '). As shown in FIGS. 8A and 8B, the pixel electrode 24
Is a transparent electrode portion 24a made of a transparent electrode film such as ITO and a reflective electrode portion 24b made of a reflective electrode film such as Al, which are electrically connected to one pixel region (a region surrounded by a broken line G in the figure). (The hatched portion in FIG. 8A). Here, the area ratio between the reflective electrode portion 24b and the transparent electrode portion 24a in one pixel region is set between 2: 8 and 8: 2. Thus, a panel with good visibility in both the transmission mode and the reflection mode can be obtained. As described above, the transparent electrode portion 24a and the reflective electrode portion 24b are also formed so as not to be continuous vertically and horizontally in order to avoid a stripe pattern at the time of display.

Such an active matrix substrate 22
One manufacturing method will be described. First, a 3000 mm thick tantalum metal layer is formed on a glass substrate 5 by a sputtering method or the like, and the metal layer is patterned into a predetermined shape by a photolithography method to form a scanning line 26 and a gate electrode 28. Next, a gate insulating film 29 made of 4000 nm thick silicon nitride (SiNX) is formed by a plasma CVD method. Next, an a-Si layer having a thickness of 1000 ° serving as the semiconductor layer 30 is stacked and patterned to form the semiconductor layer 30. Next, molybdenum metal having a thickness of 2000 ° is laminated by sputtering, and is patterned to form a source electrode 31, a drain electrode 32 and a signal line 27, thereby completing the TFT element 25.

Further, a transparent electrode film made of ITO or the like is laminated by a sputtering method or the like, and this is patterned to form a transparent electrode portion 24a. Next, a reflective electrode film made of Al or the like is laminated and patterned to form a reflective electrode portion 24b.

The color filter provided on the opposite substrate 21 of the liquid crystal display panel 20 also has a color filter 7 (see FIG. 3) of the liquid crystal display panel 1 in order to match the color tone between the reflection mode and the transmission mode. Similarly, the transparent electrode portion 24a of the pixel electrode 24 and the reflective electrode portion 2
First color filter 7 whose chromaticity is set corresponding to 4b
a and the second color filter 7b.

In the liquid crystal display device of the present embodiment having such a configuration, since the transparent electrode portion 24a and the reflective electrode portion 24b are provided in one pixel region, the liquid crystal display device is set to the transmission mode in a dark place, and the backlight is used. 9 is turned on, and the backlight is transmitted through the transparent electrode portion 24a of the pixel electrode 24 to perform display. On the other hand, in a bright place, a reflection mode is set, and the reflection at the pixel electrode 24 without turning on the backlight 9 is performed. Display is performed by reflecting external light on the electrode portion 24b.

As in the liquid crystal display device of the first embodiment, since a semi-transmissive film or a semi-transmissive reflection plate is not used, a configuration using a semi-transmissive film (a liquid crystal display panel is an active matrix type using TFTs). Compared with the case of (1), in the dark place, the transmittance of the white display is increased, the contrast is increased, the display is easy to see, and the visibility is the same as that of the conventional transmissive liquid crystal display device. In addition, indication in light place,
The reflectivity of the white display is increased, the contrast is increased, and an easy-to-view display is obtained, and the visibility is the same as that of a conventional reflective liquid crystal display device.

In the liquid crystal display of the present embodiment,
Since the active matrix type liquid crystal display panel 20 using the three-terminal element is used, it is possible to realize high-definition display in addition to high switching with good switching characteristics.

In this embodiment, as shown in FIG. 8B, the reflection electrode portion 24b of the pixel electrode 24 is formed in the same layer as the transparent electrode portion 24a. For the same reason as described above, the transparent electrode film 50 forming the transparent electrode portion 24a is formed up to the formation region of the reflective electrode portion 24b as shown in FIG. It is desirable to adopt a configuration in which it is formed so as to overlap.

Also in this case, by using a mode such as a polymer-dispersed liquid crystal or a guest / host which does not require a polarizing plate for the liquid crystal layer 3, a bright high display quality with white display close to paper white can be realized.

[Embodiment 4] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

The liquid crystal display device of the present embodiment, which is used for both the reflection type and the transmission type, has basically the same structure as the liquid crystal display device of the first embodiment shown in FIG. The difference is that in the above-described liquid crystal display panel 1, the transparent electrode portion 6a and the reflective electrode portion 6b of the pixel electrode 6 are electrically connected, and the same signal is input and the same driving is performed. On the other hand, in the electrode substrate 8 'of the liquid crystal display panel 1' of the present embodiment, as shown in FIGS. 9A and 9B, one pixel region (a region surrounded by a dashed line G in the drawing) is a unit of display. The point that the transparent electrode portion 6a and the reflective electrode portion 6b disposed in the parentheses are electrically driven independently and separately.

That is, in the liquid crystal display panel 1 'of the present embodiment, the pixel electrode 6 is formed by being divided into two sub-pixel electrodes 6' and 6 ', and these sub-pixel electrodes 6' and 6 'are formed.
And the pixel electrode 2 on the side of the electrode substrate 4, a sub-pixel composed of the transparent electrode portion 6 a and the reflective electrode portion 6 b per pixel region.
And a sub-pixel composed of

Also in this case, the area ratio between the reflective electrode portion 6b and the transparent electrode portion 6a in one pixel region is from 2: 8 to 8: 2.
Is set between. Thus, a panel with good visibility in both the transmission mode and the reflection mode can be obtained. As described above, the transparent electrode portion 6a and the reflective electrode portion 6b are also formed so as not to be continuous vertically and horizontally in order to avoid a stripe pattern at the time of display.

In the liquid crystal display of the present embodiment having such a configuration, as in the liquid crystal display of the first embodiment, a transparent electrode portion 6a and a reflective electrode portion 6b are provided in one pixel region. Therefore, the same effect as that described in the first embodiment can be obtained, for example, the display can be easily viewed in a dark place or a bright place.

In particular, since the sub-pixels including the transparent electrode portion 6a and the sub-pixels including the reflective electrode portion 6b are provided in one pixel region to enable separate driving, they are not used for display in the transmission mode. Since no voltage is applied to the reflective electrode portion 6b, and conversely, no voltage is applied to the transparent electrode portion 6a which is not used for display in the reflective mode, it is possible to further reduce power consumption. Become.

In this embodiment, for the same reason as described in the first embodiment, as shown in FIG. 9C, the transparent electrode film 50 forming the transparent electrode portion 6a is
It is preferable that the reflective electrode portion 6b is formed so as to be formed up to the formation region of b and the reflective electrode portion 6b is formed thereon.

[Fifth Embodiment] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

The liquid crystal display device of the present embodiment, which is both a reflection type and a transmission type, has basically the same structure as the liquid crystal display device of the second embodiment shown in FIG. The difference is that in the above-described liquid crystal display panel 10, the transparent electrode portion 14a and the reflective electrode portion 14b of the pixel electrode 14 are electrically connected, and the same signal is input and the same driving is performed. On the other hand, in the active matrix substrate 12 ′ of the liquid crystal display panel 10 ′ of the present embodiment, FIG.
As shown in (a) and (b), the transparent electrode portion 14a and the reflective electrode portion 14b arranged in one pixel region (a region surrounded by a broken line G in the drawing) as a unit of display electrically connect with each other. Independently,
The point is that they are separately driven by the two signal wirings 15 'and 15'.

That is, the liquid crystal display panel 1 of the present embodiment
0 ′, the pixel electrode 14 has two sub-pixel electrodes 14 ′ · 1
4 ', and these sub-pixel electrodes 14'
Between the 14 ′ and the counter electrode 13 on the counter substrate 11 side;
Each pixel area has a sub-pixel including the transparent electrode portion 14a and a sub-pixel including the reflective electrode portion 14b.

Here, the area ratio between the reflective electrode portion 14b and the transparent electrode portion 14a in one pixel region is set between 2: 8 and 8: 2. Thus, a panel with good visibility in both the transmission mode and the reflection mode can be obtained. As described above, the transparent electrode portion 14a and the reflective electrode portion 14b are also formed so as not to be continuous vertically and horizontally in order to avoid a stripe pattern at the time of display.

In the liquid crystal display device of this embodiment having such a configuration, the transparent electrode portion 14a and the reflection electrode portion 14b are formed in one pixel region, similarly to the liquid crystal display device of the second embodiment.
Is provided, the same effect as described in the second embodiment can be obtained, such as easy-to-see display in a dark place and a bright place.

In particular, since the sub-pixel including the transparent electrode portion 14a and the sub-pixel including the reflective electrode portion 14b are provided in one pixel region to enable separate driving, the display is not performed in the transmission mode. Since no voltage is applied to the reflective electrode portion 14b, and conversely, no voltage is applied to the transparent electrode portion 14a that is not used for display in the reflective mode, it is possible to further reduce power consumption. Become.

In this embodiment, for the same reason as described in the first embodiment, as shown in FIG.
The transparent electrode film 50 forming the transparent electrode portion 14a is formed up to the formation region of the reflective electrode portion 14b, and the reflective electrode portion 1b is formed.
4b is preferably formed on top of this.

[Embodiment 6] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

The liquid crystal display device of the present embodiment which is used for both the reflection type and the transmission type has basically the same structure as the liquid crystal display device of the third embodiment shown in FIG. The difference is that in the above-described liquid crystal display panel 20, the transparent electrode portion 24a and the reflective electrode portion 24b of the pixel electrode 24 are electrically connected, and the same signal is input and the same driving is performed. On the other hand, in the active matrix substrate 22 'of the liquid crystal display panel 20' of the present embodiment,
As shown in (a) and (b), the transparent electrode portion 24a and the reflective electrode portion 24b arranged in one pixel region (a region surrounded by a broken line G in the drawing) as a unit of display electrically connect with each other. Independently,
The point is that different voltages are applied to the two signal lines 27 'and 27'.

That is, the liquid crystal display panel 2 of the present embodiment
0 ′, the pixel electrode 24 has two sub-pixel electrodes 24 ′ · 2
4 ', and these sub-pixel electrodes 24'
Between the 24 ′ and the counter electrode 23 on the counter substrate 21 side;
In this configuration, one pixel region includes a sub-pixel including the transparent electrode portion 24a and a sub-pixel including the reflective electrode portion 24b.

Here, the area ratio between the reflective electrode portion 24b and the transparent electrode portion 24a in one pixel region is set between 2: 8 and 8: 2. Thus, a panel with good visibility in both the transmission mode and the reflection mode can be obtained. As described above, the transparent electrode portion 24a and the reflective electrode portion 24b are also formed so as not to be continuous vertically and horizontally in order to avoid a stripe pattern at the time of display.

In the liquid crystal display device of this embodiment having such a configuration, as in the liquid crystal display device of the third embodiment, the transparent electrode portion 24a and the reflective electrode portion 24b are formed in one pixel region.
Are provided, the same effects as described in the third embodiment can be obtained, such as easy-to-see display in a dark place and a bright place.

In particular, since the sub-pixel including the transparent electrode portion 24a and the sub-pixel including the reflective electrode portion 24b are provided in one pixel region to enable separate driving, the display is not performed in the transmission mode. Since no voltage is applied to the reflective electrode portion 24b, and conversely, no voltage is applied to the transparent electrode portion 24a that is not used for display in the reflective mode, it is possible to further reduce power consumption. Become.

Also, in this embodiment, for the same reason as described in the first embodiment, as shown in FIG.
The transparent electrode film 50 forming the transparent electrode portion 24a is formed up to the formation region of the reflective electrode portion 24b, and the reflective electrode portion 2 is formed.
4b is preferably formed on top of this.

[0090]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below.

Example 1 A liquid crystal display device having the same structure as the liquid crystal display device of the first embodiment shown in FIGS. 2 and 1A and 1B was used. It was fabricated using ITO for the transparent electrode film and Al for the reflective electrode film, and the power consumption, visibility in a bright place, and visibility in a dark place were determined. The transparent electrode 6a and the reflective electrode 6b
Was 5: 5.

The results are shown in the following description of a conventional ordinary transmission type liquid crystal display device in which the pixel electrode 6 is a transparent electrode or a reflection electrode.
12 (a) together with the results of the reflection type liquid crystal display device.
To (c). Of course, the liquid crystal display panel in the liquid crystal display device for comparison was a simple matrix type having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 11A, the power consumption of the liquid crystal display device of the embodiment is the same as that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device which is easy to see in a light place or a dark place and has low power consumption was obtained.

In addition, including other embodiments, the illuminance in a bright place is 5000 lux and the illuminance in a dark place is 50 lux. The evaluation criteria of the visibility are as follows. Slightly distinguished (level 2), 2m
m square characters can be read dimly (level 3), 2 mm square characters can be read (level 4), and 2 mm square characters can be clearly read (level 5).

Example 2 A liquid crystal display device having the same structure as the liquid crystal display device of the second embodiment shown in FIGS. 5 and 6A and 6B was used. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in a bright place, and the visibility in a dark place were obtained. Again, the area ratio between the transparent electrode portion 14a and the reflective electrode portion 14b is 5:
It was set to 5.

The results are shown in FIGS. 12 (d) to 12 (f) together with the results of a normal transmissive liquid crystal display device and a reflective liquid crystal display device in which the pixel electrode 14 is a transparent electrode or a reflective electrode. Of course, the liquid crystal display panel in the liquid crystal display device for comparison was of an active matrix type using an MIM element and having the same aperture ratio as that of the example.

As can be seen from FIG. 10D, the power consumption of the liquid crystal display device of the embodiment is equivalent to that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device which is easy to see in a light place or a dark place and has low power consumption was obtained.

[Embodiment 3] A liquid crystal display device having the same configuration as the liquid crystal display device of the third embodiment shown in FIGS. 7 and 8A and 8B is used. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in a bright place, and the visibility in a dark place were obtained. Again, the area ratio between the transparent electrode portion 24a and the reflective electrode portion 24b is 5:
It was set to 5.

The results are shown in FIGS. 12 (g) to 12 (i) together with the results of a normal transmission type liquid crystal display device and a reflection type liquid crystal display device in which the pixel electrode 24 is a transparent electrode or a reflective electrode. Needless to say, the liquid crystal display panel in the liquid crystal display device for comparison was an active matrix type using a TFT element and having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 9G, the power consumption of the liquid crystal display device of the embodiment is equivalent to that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device which is easy to see in a light place or a dark place and has low power consumption was obtained.

[Embodiment 4] A liquid crystal display device having the same structure as that of the liquid crystal display device of the fourth embodiment shown in FIGS. 2 and 9A and 9B is used. It was fabricated using ITO for the transparent electrode film and Al for the reflective electrode film, and the power consumption, visibility in a bright place, and visibility in a dark place were determined. Here, the area ratio between the transparent electrode portion 6a and the reflective electrode portion 6b was 5: 5. Also, the transparent electrode portion 6
The area of “a” and the reflective electrode portion 6b were the same as those of the liquid crystal display device of Example 1.

The results are shown in FIGS. 13 (a) to 13 (c) together with the results of a normal transmissive liquid crystal display device and a reflective liquid crystal display device in which the pixel electrode 6 is a transparent electrode or a reflective electrode. Of course, the liquid crystal display panel in the liquid crystal display device for comparison was a simple matrix type having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 11A, the power consumption of the liquid crystal display device of the embodiment is the same as that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device which is easy to see in a light place or a dark place and has low power consumption was obtained.

In addition, FIG. 12 (a) and FIG.
As can be seen from comparison with (a), the power consumption was smaller than in Example 1.

[Embodiment 5] A liquid crystal display device having the same structure as that of the liquid crystal display device of the fifth embodiment shown in FIGS. 5 and 10A and 10B is used. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in a bright place, and the visibility in a dark place were obtained. even here,
The area ratio between the transparent electrode portion 14a and the reflective electrode portion 14b is:
5: 5. The areas of the transparent electrode portion 14a and the reflective electrode portion 14b were the same as those of the liquid crystal display device of the second embodiment.

The results are shown in FIGS. 13 (d) to 13 (d) together with the results of a conventional transmission type liquid crystal display device and a reflection type liquid crystal display device in which the pixel electrode 14 is a transparent electrode portion or a reflection electrode portion.
(F). Of course, the liquid crystal display panel in the liquid crystal display device for comparison was of an active matrix type using an MIM element and having the same aperture ratio as that of the example.

As can be seen from FIG. 11D, the power consumption of the liquid crystal display device of the embodiment is the same as that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device with low power consumption and easy to see display in both bright and dark places was obtained.

Further, FIG. 12 (d) and FIG.
As can be seen from comparison with (d), the power consumption was smaller than in Example 2.

[Embodiment 6] A liquid crystal display device having the same structure as the liquid crystal display device of Embodiment 6 shown in FIGS. 7 and 11A and 11B is used. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in a bright place, and the visibility in a dark place were obtained. even here,
The area ratio between the transparent electrode portion 24a and the reflective electrode portion 24b is:
5: 5. The areas of the transparent electrode portion 24a and the reflective electrode portion 24b were the same as those of the liquid crystal display device of Example 3.

The results are shown in FIGS. 13 (g) to 13 (g) together with the results of a conventional transmission type liquid crystal display device and a reflection type liquid crystal display device in which the pixel electrode 24 is a transparent electrode portion or a reflection electrode portion.
It is shown in (i). Needless to say, the liquid crystal display panel in the liquid crystal display device for comparison was an active matrix type using a TFT element and having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 17G, the power consumption of the liquid crystal display device of the embodiment is equivalent to that of the reflection type liquid crystal display device, and as can be seen from FIGS. The visibility was equivalent to that of a reflective liquid crystal display device in a bright place, and equivalent to that of a transmissive liquid crystal display device in a dark place.

In other words, a liquid crystal display device which is easy to see in a light place or a dark place and has low power consumption was obtained.

Further, FIG. 12 (g) and FIG.
As can be seen from comparison with (g), the power consumption was smaller than in Example 3.

[Embodiment 7] A liquid crystal display device having the same structure as the liquid crystal display device of the fifth embodiment shown in FIGS. 5 and 10A and 10B is used. Using ITO for the transparent electrode film and Al for the reflective electrode film, respectively.
By changing the area of the reflective electrode portion 14b with respect to one pixel region (transparent electrode portion 14a + reflective electrode portion 14b) from 0% to 100%, visibility in a bright place is determined, and the transparent electrode portion 14a with respect to one pixel region is determined. The visibility in a dark place was determined by changing the area from 0% to 100%.

FIGS. 14A and 14B show the results. As can be seen from FIG. 7A, the visibility in a bright place is good when the area of the reflective electrode portion 14b with respect to one pixel region is 20% or more. On the other hand, the visibility in a dark place is good if the area of the transparent electrode portion 14a with respect to one pixel region is 20% or more, as can be seen from FIG.

From this, it can be seen that by setting the transparent electrode portion 14a: reflective electrode portion 14b between 2: 8 and 8: 2, good visibility can be obtained both in a bright place and in a dark place. Was.

The area ratio between the transparent electrode portion and the reflective electrode portion is different from those in the first, second, and third embodiments.
The same results were obtained in the liquid crystal display devices having the same configurations as those of the liquid crystal display devices 3, 4, and 6.

[Embodiment 8] A liquid crystal display device having the same structure as that of the liquid crystal display device of the fourth embodiment shown in FIGS. Three liquid crystal display devices were fabricated using Al for the electrode film, TN liquid crystal, polymer dispersed liquid crystal (PDLC), and guest / host (GH) liquid crystal for the liquid crystal layer 3, respectively. The transmittance was determined.

FIGS. 15A and 15B show the results. PDL
By using a C-mode or GH-mode liquid crystal, a polarizing plate becomes unnecessary, and as can be seen from FIGS.
Both the reflectance and the transmittance were higher than those of the TN liquid crystal mode, and the contrast was higher.

[0125]

As described above, the liquid crystal display device according to the first aspect of the present invention has a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween. In a liquid crystal display device in which an electrode layer for applying a voltage to the liquid crystal layer is formed, one pixel area serving as a display unit in the electrode layer formed on one of the transparent substrates reflects light. In this configuration, an electrode portion and a transparent electrode portion that transmits light are provided.

In this way, in a dark place, by illuminating the illumination means on the back surface and performing display using the transparent electrode portion, the transmittance of white display is increased, and a display with high contrast and easy to see is obtained. On the other hand, in a bright place, by performing display using the reflective electrode portion without turning on the illumination means on the rear surface, the transmittance of white display is increased, and a high-contrast display that is easy to see is obtained. Power consumption.

As a result, it is possible to provide a liquid crystal display device in which the display is easy to see in a light place or a dark place and low power consumption can be provided.

As described above, the liquid crystal display device according to the second aspect of the present invention has a pair of transparent substrates disposed so as to face each other with a liquid crystal layer interposed therebetween. In a liquid crystal display device in which an electrode layer for applying a voltage to the liquid crystal layer is formed, a reflection electrode portion for reflecting light is provided in one pixel region serving as a display unit in the electrode layer formed on one transparent substrate. And a transparent electrode portion that transmits light, and the reflective electrode portion and the transparent electrode portion are configured to be electrically independent.

Thus, in the transmission mode, a signal can be applied only to the transparent electrode portion, and in the reflection mode, a signal can be applied only to the reflection electrode portion.
And the effect that the power consumption can be further reduced.

According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, a color filter for performing color display is provided between the pair of transparent substrates. The color tone of the filter is different between the transparent electrode portion and the reflective electrode portion.

As a result, the same display color is obtained in both the transmissive mode and the reflective mode, so that the same effect as that of the liquid crystal display device according to the first or second aspect is obtained. This has the effect that it can be eliminated.

The liquid crystal display device according to a fourth aspect of the present invention is the liquid crystal display device according to the first or second aspect, wherein the area ratio between the reflective electrode portion and the transparent electrode portion in one pixel region is 2: 8.
To 8: 2.

Thus, the same effect as that of the liquid crystal display device according to claim 1 or 2 can be obtained, and further, the visibility can be improved in both the transmission mode and the reflection mode.

According to a fifth aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the reflective electrode portion and the transparent electrode portion in each pixel are different types of electrode portions between adjacent pixels. It is a configuration adjacent to.

As a result, vertical stripes and horizontal stripes do not appear at the time of display, so that the same effect as that of the liquid crystal display device according to claim 1 or 2 can be obtained, and the display quality can be further improved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention;
(A) is a plan view of an electrode substrate constituting a simple matrix type liquid crystal display panel provided in the liquid crystal display device of the present embodiment, (b) is a cross-sectional view taken along line AA ',
(C) is a sectional view taken along line AA 'of another configuration.

FIG. 2 is a perspective view illustrating a configuration of a liquid crystal display device according to first and fourth embodiments.

FIG. 3 is a cross-sectional view illustrating a configuration of a color filter of a liquid crystal display panel provided in the liquid crystal display device according to the first embodiment.

FIG. 4 is an XYZ color system chromaticity diagram showing the chromaticity of a color filter of a liquid crystal display panel provided in the liquid crystal display devices of the first to sixth embodiments.

FIG. 5 is a perspective view illustrating a configuration of a liquid crystal display device according to second and fifth embodiments.

FIG. 6 shows a second embodiment of the present invention,
(A) is a plan view of an active matrix substrate constituting a two-terminal element active matrix type liquid crystal display panel provided in the liquid crystal display device of the present embodiment, and (b).
FIG. 3 is a cross-sectional view taken along line BB ′ of FIG.
FIG. 4 is a sectional view taken along line -B ′.

FIG. 7 is a perspective view illustrating a configuration of a liquid crystal display device according to third and sixth embodiments.

FIG. 8 shows a third embodiment of the present invention,
(A) is a plan view of an active matrix substrate constituting an active matrix type liquid crystal display panel with three terminals provided in the liquid crystal display device of the present embodiment, and (b).
FIG. 3 is a cross-sectional view taken along line CC ′, and FIG.
FIG. 4 is a sectional view taken along line -C ′.

FIG. 9 shows a fourth embodiment of the present invention;
(A) is a plan view of an electrode substrate constituting a simple matrix type liquid crystal display panel provided in the liquid crystal display device of the present embodiment, (b) is a cross-sectional view taken along the line DD ′,
(C) is a sectional view taken along line DD ′ of another configuration.

FIG. 10 shows a fifth embodiment of the present invention.
(A) is a plan view of an active matrix substrate constituting a two-terminal element active matrix type liquid crystal display panel provided in the liquid crystal display device of the present embodiment, and (b).
Is a cross-sectional view taken along line EE ′, and (c) is an E-E of another configuration.
FIG. 4 is a sectional view taken along line -E ′.

FIG. 11 shows a sixth embodiment of the present invention.
(A) is a plan view of an active matrix substrate constituting an active matrix type liquid crystal display panel with three terminals provided in the liquid crystal display device of the present embodiment, and (b).
Is a cross-sectional view taken along line FF ′, and FIG.
It is sectional drawing in the -F 'line arrow.

FIGS. 12 (a) to 12 (c) show the first embodiment, and FIGS.
(F) shows the second embodiment, and (g) to (i) show the third embodiment. The liquid crystal display device of the embodiment, the conventional reflection type liquid crystal display device and the transmission type liquid crystal display device are respectively shown. 5 is a graph showing correlation between power consumption, visibility in a bright place, and visibility in a dark place.

FIGS. 13 (a) to 13 (c) show Example 4 and FIGS.
(F) shows the fifth embodiment, and (g) to (i) show the sixth embodiment. The liquid crystal display device of the embodiment, the conventional reflection type liquid crystal display device and the transmission type liquid crystal display device, respectively. 5 is a graph showing correlation between power consumption, visibility in a bright place, and visibility in a dark place.

14A and 14B are diagrams illustrating Example 7, in which FIG. 14A is a graph illustrating a relationship between the area of the reflective electrode portion with respect to one pixel region of the liquid crystal display device of Example and visibility in a bright place;
(B) is a graph showing the relationship between the area of the transparent electrode portion for one pixel region of the liquid crystal display device of the example and the visibility in a dark place.

FIGS. 15A and 15B show Example 8, in which FIG. 15A is a graph showing a comparison between the reflectances of the TN liquid crystal mode, the PDLC mode, and the GH mode, and FIG.
It is a graph which shows and compares the transmittance | permeability of DLC mode and GH mode.

[Explanation of symbols]

 1, 1 'liquid crystal display panel 2 pixel electrode (electrode layer) 3 liquid crystal layer 4, 4' electrode substrate 5 glass substrate (transparent substrate) 6, 6 'pixel electrode (electrode layer) 6a transparent electrode section 6b reflective electrode section 7 color Filter 8, 8 'Electrode substrate 9 Backlight 10, 10' Liquid crystal display panel 11 Counter substrate 12, 12 'Active matrix substrate 13 Counter electrode (electrode layer) 14, 14' Pixel electrode (electrode layer) 14a Transparent electrode portion 14b Reflection Electrode section 16 MIM element 20 20 ′ Liquid crystal display panel 21 Counter substrate 22 22 ′ Active matrix substrate 23 Counter electrode (electrode layer) 24 24 ′ Pixel electrode (electrode layer) 24a Transparent electrode section 24b Reflection electrode section 25 TFT element

Claims (5)

[Claims] 1. A liquid crystal display device comprising: a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween; and an electrode layer for applying a voltage to the liquid crystal layer is formed on each of the opposed surfaces of the transparent substrates. In a liquid crystal display device, a reflective electrode portion that reflects light and a transparent electrode portion that transmits light are provided in one pixel region serving as a display unit in an electrode layer formed on one transparent substrate. Characteristic liquid crystal display device. 2. A liquid crystal device comprising a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween, and an electrode layer for applying a voltage to the liquid crystal layer is formed on each of the opposed surfaces of the transparent substrates. In a liquid crystal display device, a reflective electrode portion that reflects light and a transparent electrode portion that transmits light are provided in one pixel region serving as a display unit in an electrode layer formed on one of the transparent substrates; A liquid crystal display device, wherein the reflective electrode portion and the transparent electrode portion are electrically independent. 3. A color filter for performing color display between the pair of transparent substrates, wherein a color tone of the color filter is different between the transparent electrode portion and the reflective electrode portion. 3. The liquid crystal display device according to 2. 4. The liquid crystal display device according to claim 1, wherein an area ratio between the reflective electrode portion and the transparent electrode portion in one pixel region is between 2: 8 and 8: 2. 5. The liquid crystal display device according to claim 1, wherein the reflective electrode portion and the transparent electrode portion in each pixel are adjacent to different types of electrode portions between adjacent pixels.