JP3406515B2 - Liquid crystal display - Google Patents

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 reflective and transmissive functions.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have a low power consumption,
Because of its thinness and lightness,
It is used for display applications such as word processors, terminal display devices for office automation, and televisions. Especially in the future, it is considered that liquid crystal display devices will be widely used for mobile information terminals.

At present, as liquid crystal display devices for portable information terminals, reflection type (natural light is incident from the front side of the panel and emitted to the front side) and transmissive type (light of backlight is incident from the rear side of the panel). The one that emits to the front side) is widespread.

In a transmissive liquid crystal display device having a backlight on the back surface of the panel, the white display has a high transmittance and a high contrast because the light source is present even in a dark place, and the display is easy to see. However, since the backlight is used, there is a problem that power consumption increases. Moreover,
In brighter places, 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 utilizing external light, the reflectance of white display is high in a bright place, the contrast is high, and the display is easy to see. Moreover, since no backlight is used, power consumption is low. However, since there is no light source in a dark place, the reflectance of white display is low, making it difficult to see, and when it gets darker, it becomes completely invisible.

In recent years, liquid crystal display devices such as portable information terminals have rapidly become portable, and the environment in which the liquid crystal display device is used (bright place, dark place) 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 reflective type and a transmissive type.

Conventionally, a semi-transmissive liquid crystal display device has been proposed as a liquid crystal display device of a combination of a reflective type and a transmissive type. This is a transmissive liquid crystal display device in which a semi-transmissive reflection plate such as a magic mirror is arranged between a liquid crystal display element (panel) and an illuminating means on the back surface thereof. The main part of this semi-transmissive reflector is
For example, it is composed of a diffuser plate such as a semi-transmissive plastic sheet, and a mesh metal reflective film provided thereon (prior art).

As a result, under a bright lighting environment,
Display is performed by turning off the illumination means on the back surface such as a backlight and by reflecting the external light such as indoor lighting by the semi-transmissive reflection plate. That is, in this case, the external light is a reflection type that is used as the reflection illumination. On the other hand, in a dark illumination environment, the display is performed by turning on the illumination means on the back surface. That is, in this case, it is a transmissive type in which the light from the illumination means that is transmitted through the semi-transmissive reflector is used.

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

[0010]

However, all of the above-mentioned prior arts use a semi-transmissive reflector or a semi-transmissive film, so that when used as a transmissive type (transmissive mode), a white display is transmissive. When it is used as a reflection type (reflection mode), the contrast decreases due to a decrease in the ratio,
The contrast decreases due to the decrease in the reflectance of white display, and the visibility is inferior as compared with a normal reflection type or transmission type liquid crystal display device.

Further, when color display is made possible by using a color filter, the number of times light passes through the color filter is
Since the transmission mode (1 time) and the reflection mode (2 times) 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 bright and dark places and consumes less power. A further purpose is to provide a high-quality liquid crystal display with no difference in display color in bright or dark places. To provide a device.

[0013]

In order to solve the above-mentioned problems, a liquid crystal display device according to claim 1 of the present invention has a pair of transparent substrates which are 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 the opposing surfaces of these transparent substrates, one pixel serving as a display unit in the electrode layer formed on one transparent substrate In the area, a reflective electrode portion that reflects light,
A transparent electrode part that transmits light is provided, and each pixel is
The reflective electrode portion and the transparent electrode portion in the
It is characterized in that it is adjacent to different types of electrode portions .

According to this, two kinds of electrodes, that is, a transparent electrode portion and a reflective electrode portion are formed in one pixel region which is a display unit. Therefore, in a dark place, the illumination means on the back surface is turned on and the display is performed using the transparent electrode portion, whereby the transmittance of white display is increased and a display with high contrast and easy to see can be 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 back surface, the transmittance of white display is increased, and a display with high contrast and easy-to-see display is obtained. Power consumption.

Further , the reflective electrode portion and the transparent portion in each pixel
The electrode parts are different kinds of electrode parts between adjacent pixels.
By adjoining the
Because the poles are not continuous vertically and horizontally,
Vertical stripes and horizontal stripes do not appear and high quality display is realized.

In order to solve the above-mentioned problems, a liquid crystal display device according to a second aspect of the present invention has a pair of transparent substrates which are opposed to each other with a liquid crystal layer interposed therebetween, and the transparent substrates face each other. In a liquid crystal display device in which an electrode layer for applying a voltage to the liquid crystal layer is formed on one surface, light is reflected to one pixel region which is a display unit in the electrode layer formed on one transparent substrate. Is provided, and a transparent electrode part that transmits light is provided, and the reflective electrode part and the transparent electrode part are electrically independent.

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

Moreover, in this case, the reflective electrode portion and the transparent electrode portion which form one pixel are electrically independent. That is, one pixel is composed of a sub-pixel including a reflective electrode portion and a sub-pixel including a transparent electrode portion. Therefore, when used as a transmissive type (transmissive mode), it is possible to apply a signal only to the transparent electrode part, and when used as a reflective type (reflective mode), it is possible to apply a signal only to the reflective electrode part. 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 second aspect , a color filter for performing color display is provided between the pair of transparent substrates. The color tone of the transparent electrode portion is different from that of the reflective electrode portion.

According to this, since the color tone of the color filter is changed on the transparent electrode portion and the reflection electrode portion, in the transmission mode (1
It is possible to correct the difference in appearance between the (twice) and the reflection mode (twice), and the same display color is obtained in the transmission mode and the reflection mode.

The liquid crystal display device according to claim 4 of the present invention, in the structure according to claim 2, the area ratio of the reflective electrode part and the transparent electrode portion in one pixel region, 2: 8 to 8: 2 It is characterized by being between.

According to this, since the area ratio of the reflective electrode portion and the transparent electrode portion in one pixel region is set as described above, the visibility is good 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 second aspect , the reflective electrode portion and the transparent electrode portion in each pixel are adjacent to different kinds of electrode portions between adjacent pixels. It is characterized by matching.

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 high-quality display is realized.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] The following will describe one embodiment of the present invention with reference to FIGS. 1 to 4.

As shown in FIG. 2, the reflection type / transmission type 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. is doing.

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

The electrode substrate 4 on the display surface side has a color filter (not shown) formed on the surface of the glass substrate (transparent substrate) 5 on the liquid crystal layer 3 side, and the ITO (I
It has a transparent stripe-shaped pixel electrode (electrode layer) 2 made of a transparent electrode film such as a small 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 the direction perpendicular to the substrate surface, and a pixel serving as a display unit is formed at the intersection of both pixel electrodes 2 and 6. ing. The pixels are arranged in a matrix in the entire liquid crystal display panel 1.

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

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, in other words, the transparent electrode portions 6a are adjacent to each other. , And the reflective electrode portions 6b are formed so as not to be continuous vertically and horizontally.

In such an electrode substrate 8, for example, a transparent electrode film made of ITO or the like is laminated on the glass substrate 5 by a sputtering method or the like and patterned to form a transparent electrode portion 6a in the pixel electrode 6, and then, It is obtained by stacking a reflective electrode film made of Al, Al or the like and patterning this to form the reflective electrode portion 6b.

FIG. 3 shows the color filter 7 provided on the electrode substrate 4 in the liquid crystal display panel 1. The color filter 7 is composed of a first color filter 7a and a second color filter 7b which respectively face the transparent electrode portion 6a and the reflective electrode portion 6b of the pixel electrode 6 when the color filter 7 is disposed so as to face the electrode substrate 8. The first color filter 7a and the second color filter 7b have different chromaticities of monochromatic filters corresponding to RGB.

The XYZ color system chromaticity diagram of FIG. 4 (CIE193
The chromaticity of the first color filter 7a and the second color filter 7b is shown in FIG. The chromaticity a indicated by the alternate long and short dash 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.
Corresponding to the second color filter 7b.

In the case of the first color filter 7a, the chromaticity when incorporated in the liquid crystal display device is only once when the transmitted light is incident in the transmissive mode. In the case of the second color filter 7b, the transmitted light and the reflected light are incident in the reflection mode, so that the light passes through the second color filter 7b twice. Therefore, the second color filter 7
The chromaticity of b is not the chromaticity a, but is set to the chromaticity b shown by the broken line, which shows the same color display as the same single-pass transmission mode when passing twice.

In the liquid crystal display device of the present embodiment having such a structure, since the transparent electrode portion 6a and the reflective electrode portion 6b are provided in one pixel area, the backlight is set in the transmissive mode in a dark place. 9 is turned on, and the backlight light is transmitted through the transparent electrode portion 6a of the pixel electrode 6 for display. On the other hand, in a bright place, the reflection mode of the consumption electrode is set to be small, and external light is reflected by the reflection electrode portion 6b of the pixel electrode 6 to perform display.

Unlike the conventional semi-transmissive liquid crystal display device, the liquid crystal display device described above does not use a semi-transmissive film or a semi-transmissive reflection plate. Compared with the (matrix type), the display in a dark place has a higher transmittance of white display and a higher contrast, and a display that is easy to see 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 white display is increased, the contrast is increased, and a display that is easy to see is obtained, and the visibility is equivalent to that of a conventional reflective liquid crystal display device.

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

Further, as the color filter 7, there are provided 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 in 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 colors in each mode are the same.

Further, in the above structure, the pixel electrode 6
Since the transparent electrode portion 6a and the reflective electrode portion 6b in No. 2 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 reflective electrode portion 6b and the reflective electrode portion 6b are continuous in one direction, vertical stripes and horizontal stripes due to the cycle appear in the display, and the display quality is degraded.

Further, in the structure in which the transparent electrode portion 6a and the reflective electrode portion 6b are formed in one pixel area as described above, a normal transmission type or reflection type in which only one transparent electrode or only a reflective electrode is provided in one pixel area. Although the aperture ratio is lower than that of the above liquid crystal display device, by adopting the simple matrix type liquid crystal display panel 1 having a high aperture ratio, it is possible to realize a bright and high-contrast display by 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, but FIG. As shown in, the transparent electrode film 50 forming the transparent electrode portion 6a.
May be formed up to the region where the reflective electrode portion 6b is formed, and the reflective electrode portion 6b may be formed so as to overlap therewith. With such a configuration, even if the reflective electrode film that constitutes the reflective electrode portion 6b is missing, disconnection is prevented in the lower transparent electrode film 50, and the resistance value of the pixel electrode 6 is lowered. be able to.

Further, in the TN mode in which the TN liquid crystal is used 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 PDLC) or guest / host, it is possible to eliminate light loss due to the polarizing plate and to realize a bright and high display quality in which white display is close to paper white.

[Second Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 5 and 6. For convenience of explanation, members having the same functions as those of the members described in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The reflective / transmissive liquid crystal display device according to the present embodiment, as shown in FIG. 5, is an active matrix liquid crystal using a 2-terminal switching element for each pixel as a liquid crystal display panel. This is a configuration including the display panel 10. Here, MIM (Meta
l-Insulater-Metal) element is used.

The liquid crystal display panel 10 has a structure 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 has 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 striped 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 formed on the surface of the glass substrate 5 on the liquid crystal layer 3 side by the above-mentioned counter electrode 13
The signal wiring 15 is formed in a direction orthogonal to the MIM, and the MIM is formed at the intersection of the signal wiring 15 and the counter electrode 13 described above.
The element 16 and the pixel electrode 14 are formed. The pixel serving as a display unit includes the pixel electrode 14 and the counter electrode 13.
Pixels are formed at the intersections with and are arranged in a matrix in the entire liquid crystal display panel 10.

FIG. 6A shows a plan view of the active matrix substrate 12 in the liquid crystal display panel 10, and FIG. 6B shows a sectional view thereof (a 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 area (area surrounded by a broken line G in the figure). (Hatched portion in FIG. 6A). Also in this case, 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. As a result, a panel with good visibility can be obtained in both the transmissive mode and the reflective mode. Further, similarly to the above, in order to avoid a striped pattern at the time of display, the transparent electrode portion 14a and the reflective electrode portion 14b are also formed so as not to be continuous vertically and horizontally.

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

Further, a transparent electrode film made of ITO or the like is laminated by a sputtering method or the like and 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 counter substrate 11 of the liquid crystal display panel 10 also has the color filter 7 (see FIG. 3) in the liquid crystal display panel 1 in order to match the color tone between the reflection mode and the transmission mode. Similarly to the above, the transparent electrode portion 14 a of the pixel electrode 14 and the reflective electrode portion 1
The 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 area, the backlight is set in the transmissive mode in a dark place. 9 is turned on, and the backlight light is transmitted through the transparent electrode portion 14a of the pixel electrode 14 to perform display. On the other hand, in the bright place, the reflection mode is set, and the backlight 9 is not turned on to reflect light on the pixel electrode 14. External light is reflected by the electrode portion 14b to perform display.

As with the liquid crystal display device according to the first embodiment, since no semi-transmissive film or semi-transmissive reflector is used, a structure using them is used (the liquid crystal display panel is an active matrix type using MIM elements). In contrast, in a dark place, the white display has a higher transmittance and a higher contrast, and a display that is easy to see is obtained, and the visibility is equivalent to that of a conventional transmissive liquid crystal display device. Also, the display in the light place,
The reflectance of white display is increased, the contrast is increased, a display that is easy to see is obtained, and the visibility is equivalent to that of a conventional reflective liquid crystal display device.

Further, in the liquid crystal display device of this embodiment,
Since the active matrix type liquid crystal display panel 10 using the two-terminal element is used, in addition to high contrast due to good switching characteristics, reduction of the pixel area is minimized even if the aperture ratio is lowered as described above. A bright and 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, as shown in FIG. 6C, the transparent electrode film 50 forming the transparent electrode portion 14a is formed up to the region where the reflective electrode portion 14b is formed, and the reflective electrode portion 14b is formed on the transparent electrode film 14b. It is desirable to have a structure in which they are formed by overlapping.

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

Third Embodiment Another embodiment of the present invention will be described below with reference to FIGS. 7 and 8. For convenience of explanation, members having the same functions as those of the members described in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 7, the liquid-reflective type / transmissive type liquid crystal display device according to the present embodiment is an active matrix type liquid crystal display panel using a switching element of three-terminal elements for each pixel. This is a configuration including a liquid crystal display panel 20. Here, a TFT (Th
in Film Transistor) element is used.

The liquid crystal display panel 20 has a structure 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 counter substrate 21, which is the display surface side, has a color filter (not shown) on the surface of the glass substrate 5 on the liquid crystal layer 3 side.
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 the glass substrate 5
The scanning lines 26 and the signal lines 27 that are orthogonal to each other are formed on the surface of the liquid crystal layer 3 side of the scanning lines 26 and the signal lines 2.
The TFT element 25 and the pixel electrode 24 are formed at the intersection with 7. Pixels serving as display units are formed at the intersections of the pixel electrodes 24 and the counter electrodes 23, and the pixels are arranged in a matrix in the entire liquid crystal display panel 20.

FIG. 8A shows a plan view of the active matrix substrate 22 in the liquid crystal display panel 20, and FIG. 8B shows a sectional view thereof (a sectional view taken along the 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 area (area surrounded by a broken line G in the figure). (Hatched portion in FIG. 8A). Also in this case, the area ratio between the reflective electrode portion 24b and the transparent electrode portion 24a in one pixel region is set to be between 2: 8 and 8: 2. As a result, a panel with good visibility can be obtained in both the transmissive mode and the reflective mode. Further, similarly to the above, in order to avoid a striped pattern at the time of display, the transparent electrode portion 24a and the reflective electrode portion 24b are also formed so as not to be continuous vertically and horizontally.

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

Further, a transparent electrode film made of ITO or the like is laminated by a sputtering method or the like and 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 counter substrate 21 of the liquid crystal display panel 20 also has the color filter 7 (see FIG. 3) in the liquid crystal display panel 1 in order to match the color tone between the reflection mode and the transmission mode. Similarly to the above, the transparent electrode portion 24a of the pixel electrode 24 and the reflective electrode portion 2
The 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 backlight is set in the transmissive mode in a dark place. 9 is turned on, and the backlight light is transmitted through the transparent electrode portion 24a of the pixel electrode 24 to perform display. On the other hand, in the bright place, the reflection mode is set, and the backlight 9 is not turned on to reflect light on the pixel electrode 24. External light is reflected by the electrode portion 24b to perform display.

As with the liquid crystal display device according to the first embodiment, since no semi-transmissive film or semi-transmissive reflector is used, a configuration using a kodala (the liquid crystal display panel is an active matrix type using TFTs) is used. In contrast, the display in a dark place has a higher transmittance of white display and a higher contrast, and a display that is easy to see is obtained, and the visibility is equivalent to that of a conventional transmissive liquid crystal display device. Also, the display in the light place,
The reflectance of white display is increased, the contrast is increased, a display that is easy to see is obtained, and the visibility is equivalent to 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 20 using the three-terminal element is used, it is possible to realize high-definition display in addition to high contrast due to good switching characteristics.

In this embodiment also, as shown in FIG. 8B, the reflective 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, as shown in FIG. 3C, the transparent electrode film 50 forming the transparent electrode portion 24a is formed up to the region where the reflective electrode portion 24b is formed, and the reflective electrode portion 24b is formed on the transparent electrode film 24b. It is desirable to have a structure in which they are formed by overlapping.

Also here, by using a mode such as a polymer-dispersed liquid crystal which does not require a polarizing plate or a guest-host mode for the liquid crystal layer 3, it is possible to realize a bright and high display quality in which white display is close to paper white.

[Fourth Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 2 and 9. For convenience of explanation, members having the same functions as those of the members described in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The reflective / transmissive liquid crystal display device according to this embodiment basically has the same structure as the liquid crystal display device according to the first embodiment shown in FIG. The difference is that in the liquid crystal display panel 1 described above, the transparent electrode portion 6a and the reflective electrode portion 6b in the pixel electrode 6 are electrically connected, and the same signal is input and the same drive is performed. On the other hand, in the electrode substrate 8 ′ of the liquid crystal display panel 1 ′ according to the present embodiment, as shown in FIGS. 9A and 9B, one pixel region (a region surrounded by a broken line G in the drawing, which is a display unit). The point that the transparent electrode portion 6a and the reflection electrode portion 6b arranged inside 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 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 6a and the reflective electrode portion 6b per pixel area.
And a sub-pixel consisting of

Here again, the area ratio of the reflective electrode portion 6b to the transparent electrode portion 6a in one pixel region is from 2: 8 to 8: 2.
Is set between. As a result, a panel with good visibility can be obtained in both the transmissive mode and the reflective mode. Further, similarly to the above, in order to avoid a striped pattern at the time of display, the transparent electrode portion 6a and the reflective electrode portion 6b are also formed so as not to be continuous vertically and horizontally.

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

In particular, by providing a sub-pixel composed of the transparent electrode portion 6a and a sub-pixel composed of the reflective electrode portion 6b in one pixel area so that they can be driven separately, they are not used for display in the transmissive mode. 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, so that power consumption can be further suppressed. Become.

Also 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 formed on the reflective electrode portion 6 as shown in FIG.
It is desirable that the reflective electrode portion 6b is formed up to the region where b is formed, and the reflective electrode portion 6b is formed thereon.

[Fifth Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 5 and 10. For convenience of explanation,
Members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The reflective / transmissive liquid crystal display device according to the present embodiment basically has the same structure as the liquid crystal display device according to the second embodiment shown in FIG. The difference is that in the liquid crystal display panel 10 described above, the transparent electrode portion 14a and the reflective electrode portion 14b in the pixel electrode 14 are electrically connected, and the same signal is input and the same drive 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 (region surrounded by a broken line G in the drawing) which is a display unit are electrically connected to 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
In 0 ′, the pixel electrode 14 has two sub-pixel electrodes 14 ′ · 1
4'are formed separately, and these subpixel electrodes 14 'are formed.
Between 14 'and the counter electrode 13 on the counter substrate 11 side,
The configuration is such that one pixel region has a sub-pixel including the transparent electrode portion 14a and a sub-pixel including the reflective electrode portion 14b.

Also in this case, the area ratio between the reflective electrode portion 14b and the transparent electrode portion 14a in one pixel area is set between 2: 8 and 8: 2. As a result, a panel with good visibility can be obtained in both the transmissive mode and the reflective mode. Further, similarly to the above, in order to avoid a striped pattern at the time of display, the transparent electrode portion 14a and the reflective electrode portion 14b are also formed so as not to be continuous vertically and horizontally.

In the liquid crystal display device of the present embodiment having such a configuration, as in the liquid crystal display device of the second embodiment, the transparent electrode portion 14a and the reflective electrode portion 14b are formed in one pixel region.
Since and are provided, the same effects as those described in the second embodiment can be obtained such that the display can be easily viewed in a dark place and a bright place.

In particular, by providing the sub-pixel composed of the transparent electrode portion 14a and the sub-pixel composed of the reflective electrode portion 14b in one pixel area so that they can be driven separately, the display is not performed in the transmissive mode. 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, so that power consumption can be further suppressed. 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 14a is formed up to the region where the reflective electrode portion 14b is formed.
It is desirable to have a structure in which 4b is formed on top of this.

[Sixth Embodiment] The following will describe another embodiment of the present invention in reference to FIGS. 7 and 11. For convenience of explanation,
Members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The reflective / transmissive liquid crystal display device according to the present embodiment basically has the same structure as the liquid crystal display device according to the third embodiment shown in FIG. The difference is that in the liquid crystal display panel 20 described above, the transparent electrode portion 24a and the reflective electrode portion 24b in the pixel electrode 24 are electrically connected, and the same signal is input and the same drive 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 FIG.
As shown in (a) and (b), the transparent electrode portion 24a and the reflective electrode portion 24b arranged in one pixel region (region surrounded by a broken line G in the drawing) which is a display unit are electrically connected to each other. Independently,
This is a point where different voltages are applied to the two signal lines 27 'and 27'.

That is, the liquid crystal display panel 2 of the present embodiment
In 0 ′, the pixel electrode 24 has two sub-pixel electrodes 24 ′ · 2.
The sub-pixel electrodes 24 'are formed separately.
Between 24 'and the counter electrode 23 on the counter substrate 21 side,
The configuration is such that one pixel region has a sub-pixel including the transparent electrode portion 24a and a sub-pixel including the reflective electrode portion 24b.

Also in this case, the area ratio between the reflective electrode portion 24b and the transparent electrode portion 24a in one pixel area is set to be between 2: 8 and 8: 2. As a result, a panel with good visibility can be obtained in both the transmissive mode and the reflective mode. Further, similarly to the above, in order to avoid a striped pattern at the time of display, the transparent electrode portion 24a and the reflective electrode portion 24b are also formed so as not to be continuous vertically and horizontally.

In the liquid crystal display device of the present 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 area.
Since and are provided, the same effects as those described in the third embodiment can be obtained such that the display can be easily viewed in a dark place and a bright place.

In particular, by providing the sub-pixel composed of the transparent electrode portion 24a and the sub-pixel composed of the reflective electrode portion 24b in one pixel area to enable different driving, the display is not performed in the transmissive mode. Since no voltage is applied to the reflective electrode portion 24b and, conversely, no voltage is applied to the transparent electrode portion 24a which is not used for display in the reflective mode, it is possible to further reduce power consumption. Become.

[0090] Also in this embodiment, from the same reason as described in the first embodiment, as shown in FIG. 11 (c), a transparent electrode film 50 for forming the transparent electrode portions 24a reflective electrode part 24b It is preferable that the reflective electrode portion 24b is formed up to the formation region of the above, and the reflective electrode portion 24b is overlapped and formed thereon.

[0091]

EXAMPLES Examples of the present invention will be described below.

Example 1 A liquid crystal display device having the same configuration as that of the liquid crystal display device of the above-described first embodiment shown in FIGS. 2 and 1A and 1B was prepared by adding a TN liquid crystal to the liquid crystal layer 3. Using ITO as the transparent electrode film and Al as the reflective electrode film, the power consumption, the visibility in the bright place, and the visibility in the dark place were determined. The area ratio of the transparent electrode portion 6a and the reflective electrode portion 6b was set to 5: 5.

As a result, the conventional ordinary transmissive liquid crystal display device in which the pixel electrode 6 is a transparent electrode or a reflective electrode,
And the results of the reflective liquid crystal display device, as shown in FIG.
~ (C). Of course, the liquid crystal display panel in the liquid crystal display device for comparison was of a simple matrix type having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 9A, the liquid crystal display device of the embodiment has the same power consumption 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 reflection type liquid crystal display device in a bright place, and was equal to that of a transmission type liquid crystal display device in a dark place.

That is, a liquid crystal display device in which the display is easy to see in a bright place and a dark place and the power consumption is low was obtained.

In addition, including the other examples, the illuminance in a bright place is 5000 lux, the illuminance in a dark place is 50 lux, and the evaluation criteria of the visibility are that no characters are readable (level 1) or black and white. Slightly discernible (Level 2), 2m
The m-square character was dimly read (level 3), the 2 mm square character was readable (level 4), and the 2 mm square character was clearly readable (level 5).

Example 2 A liquid crystal display device having the same structure as that of the liquid crystal display device of the above-described second embodiment shown in FIGS. 5 and 6A and 6B was prepared by using TN liquid crystal in the liquid crystal layer 3. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in the bright place, and the visibility in the dark place were determined. Also in this case, the area ratio of the transparent electrode portion 14a and the reflective electrode portion 14b was set to 5: 5.

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

As can be seen from FIG. 9D, the liquid crystal display device of the embodiment has the same power consumption 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 reflection type liquid crystal display device in a bright place, and was equal to that of a transmission type liquid crystal display device in a dark place.

That is, a liquid crystal display device in which the display is easy to see in a bright place and a dark place and the power consumption is low was obtained.

Example 3 A liquid crystal display device having the same configuration as that of the liquid crystal display device of the above-described third embodiment shown in FIGS. 7 and 8A and 8B was prepared by using TN liquid crystal in the liquid crystal layer 3. It was manufactured according to the above-mentioned one manufacturing method, and the power consumption, the visibility in the bright place, and the visibility in the dark place were determined. Here again, the area ratio of the transparent electrode portion 24a and the reflective electrode portion 24b is set to 5: 5.

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

As can be seen from FIG. 9G, the liquid crystal display device of the embodiment has the same power consumption 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 reflection type liquid crystal display device in a bright place, and was equal to that of a transmission type liquid crystal display device in a dark place.

That is, a liquid crystal display device in which the display is easy to see in a bright place and a dark place and the power consumption is low was obtained.

Example 4 A liquid crystal display device having the same structure as that of the liquid crystal display device of the above-described fourth embodiment shown in FIGS. 2 and 9A and 9B was used. Using ITO as the transparent electrode film and Al as the reflective electrode film, the power consumption, the visibility in the bright place, and the visibility in the dark place were determined. even here,
The area ratio between the transparent electrode portion 6a and the reflective electrode portion 6b is 5: 5.
And The areas of the transparent electrode portion 6a and the reflective electrode portion 6b are the same as those of the liquid crystal display device of the first embodiment.

The results are shown in FIGS. 13A to 13C 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 of a simple matrix type having the same aperture ratio as that of the embodiment.

As can be seen from FIG. 10A, the liquid crystal display device of the embodiment has power consumption 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 reflection type liquid crystal display device in a bright place, and was equal to that of a transmission type liquid crystal display device in a dark place.

That is, a liquid crystal display device in which the display is easy to see in a bright place and a dark place and the power consumption is low was obtained.

Moreover, FIG. 12 (a) and FIG.
As can be seen by comparing with (a), the power consumption can be made smaller than that of the first embodiment.

[Embodiment 5] Embodiment 5 shown in FIG. 5 and FIGS. 10 (a) and 10 (b).
A liquid crystal display device having the same configuration as that of the above liquid crystal display device is manufactured according to the above-described one manufacturing method by using TN liquid crystal in the liquid crystal layer 3, and the power consumption, the visibility in the bright place, and the visibility in the dark place. Respectively asked. Also in this case, the area ratio of the transparent electrode portion 14a and the reflective electrode portion 14b was set to 5: 5. The areas of the transparent electrode portion 14a and the reflective electrode portion 14b are 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 the conventional transmissive liquid crystal display device and the conventional reflective liquid crystal display device in which the pixel electrode 14 is a transparent electrode portion or a reflective electrode portion.
It shows in (f). As a matter of course, the liquid crystal display panel in the liquid crystal display device for comparison was an active matrix type using an MIM element, which has the same aperture ratio as that of the embodiment.

As can be seen from FIG. 9D, the liquid crystal display device of the embodiment has the same power consumption 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 reflection type liquid crystal display device in a bright place, and was equal to that of a transmission type liquid crystal display device in a dark place.

That is, a liquid crystal display device in which the display is easy to see in a bright place and a dark place and the power consumption is low was obtained.

Moreover, FIG. 12 (d) and FIG.
As can be seen by comparing with (d), the power consumption can be made smaller than that of the second embodiment.

[Sixth Embodiment] The above-described sixth embodiment shown in FIGS. 7 and 11A and 11B.
A liquid crystal display device having the same configuration as that of the above liquid crystal display device is manufactured according to the above-described one manufacturing method by using TN liquid crystal in the liquid crystal layer 3, and the power consumption, the visibility in the bright place, and the visibility in the dark place. Respectively asked. Here again, the area ratio of the transparent electrode portion 24a and the reflective electrode portion 24b is set to 5: 5. The areas of the transparent electrode portion 24a and the reflective electrode portion 24b are the same as those of the liquid crystal display device of the third embodiment.

The results are shown in FIGS. 13 (g) to 13 (g), together with the results of the conventional transmissive liquid crystal display device and the conventional reflective liquid crystal display device in which the pixel electrode 24 is the transparent electrode portion or the reflective electrode portion.
Shown in (i). As a matter of course, the liquid crystal display panel in the liquid crystal display device for comparison was an active matrix type using TFT elements, which has the same aperture ratio as that of the embodiment.

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

That is, a liquid crystal display device in which display is easy to see in a bright place and a dark place and power consumption is low was obtained.

Moreover, FIG. 12 (g) and FIG.
As can be seen by comparing with (g), the power consumption could be made smaller than in Example 3.

[Embodiment 7] The above-described fifth embodiment shown in FIGS. 5 and 10A and 10B.
A liquid crystal display device having the same configuration as that of the liquid crystal display device of No. 1 is used, a TN liquid crystal is used for the liquid crystal layer 3, ITO is used for the transparent electrode film, and Al is used for the reflective electrode film.
4a + the area of the reflective electrode portion 14b with respect to the reflective electrode portion 14b) is changed from 0% to 100% to obtain visibility in a bright place and the transparent electrode portion 14a for one pixel region.
The area was changed from 0% to 100%, and the visibility in the dark was obtained.

The results are shown in FIGS. 14 (a) and 14 (b). As can be seen from FIG. 9A, the visibility in a bright place is good if 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 the dark 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 is understood that by setting the transparent electrode portion 14a: the reflective electrode portion 14b between 2: 8 and 8: 2, good visibility can be obtained in both bright and dark places. It was

As for the area ratio of the transparent electrode portion and the reflective electrode portion, the above-mentioned first, second,
The same results were obtained with the liquid crystal display devices having the same configurations as the liquid crystal display devices 3, 4, and 6.

Example 8 A liquid crystal display device having the same configuration as that of the liquid crystal display device of the above-described fourth embodiment shown in FIGS. 2 and 9A and 9B was prepared by applying ITO to the transparent electrode film and reflecting. Al is used for each electrode film, and the liquid crystal layer 3 includes TN liquid crystal, polymer dispersed liquid crystal (PDLC),
Three liquid crystal display devices were manufactured using guest-host (GH) liquid crystals, respectively, and the reflectance and the transmittance were obtained.

The results are shown in FIGS. 15 (a) and 15 (b). PDL
Since using a C-mode or G-H mode liquid crystal eliminates the need for a polarizing plate, as can be seen from the figures (a) and (b),
Both the reflectance and the transmittance were higher than those in the TN liquid crystal mode, and the contrast was high.

[0126]

As described above, the liquid crystal display device according to the first aspect of the present invention has a pair of transparent substrates which are arranged to face each other with the liquid crystal layer interposed therebetween, and the transparent substrates are provided on the respective facing surfaces. In a liquid crystal display device in which an electrode layer for applying a voltage is formed on the liquid crystal layer, a reflection that reflects light to one pixel region that is a display unit in the electrode layer formed on one transparent substrate The electrode part and the transparent electrode part that transmits light are installed.
And a reflective electrode portion and a transparent electrode in each pixel
Part is adjacent to an electrode part of a different type between adjacent pixels.
It is a composition to meet each other.

Thus, in a dark place, the illumination means on the back surface is turned on and the transparent electrode portion is used for display, so that the transmittance of white display is increased and a display with high contrast and easy to see can be 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 back surface, the transmittance of white display is increased, and a display with high contrast and easy-to-see display 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 bright place and a dark place and the power consumption is low.

The reflective electrode portion and the transparent portion in each pixel
The electrode parts are different kinds of electrode parts between adjacent pixels.
By adjoining, vertical stripes and horizontal stripes do not appear in the display
It also has the effect of further improving the display quality.
To do.

As described above, the liquid crystal display device according to the second aspect of the present invention has a pair of transparent substrates which are arranged to face each other with the liquid crystal layer interposed therebetween, and the transparent substrate is provided on each of the facing surfaces with the above-mentioned transparent substrate. In a liquid crystal display device in which an electrode layer for applying a voltage is formed on the liquid crystal layer, a reflective electrode portion that reflects light in one pixel region that is 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 electrically independent.

With this, it is possible to apply a signal only to the transparent electrode portion in the transmissive mode, and to apply a signal only to the reflective electrode portion in the reflective mode.
The liquid crystal display device has the same effect as that of the liquid crystal display device described in (1) and further has 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 second aspect , a color filter for performing color display is provided between the pair of transparent substrates. The color tone is different between the transparent electrode portion and the reflective electrode portion.

As a result, the same display color is obtained in the transmissive mode and the reflective mode, so that the same effect as that of the liquid crystal display device according to the second aspect can be obtained, and the difference in the display color can be eliminated even in the bright place and the dark place. There is an effect that can be.

In the liquid crystal display device according to claim 4 of the present invention, in the structure according to claim 2 , the area ratio of the reflective electrode portion and the transparent electrode portion in one pixel region is from 2: 8 to 8: 2. It is a composition which is between.

As a result, the same effect as that of the liquid crystal display device according to the second aspect 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 second aspect , the reflective electrode section and the transparent electrode section in each pixel are adjacent to different kinds of electrode sections between adjacent pixels. It is a composition that fits.

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 the second aspect can be obtained, and the display quality can be further improved.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention,
(A) is a plan view of an electrode substrate that constitutes a simple 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 the line AA ′ of FIG.
(C) is a sectional view taken along the line AA 'of another configuration.

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

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

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

FIG. 5 is a perspective view showing 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 which constitutes an active matrix type liquid crystal display panel of a two-terminal element provided in the liquid crystal display device of the present embodiment;
Is a cross-sectional view taken along the line BB ′, and (c) is another configuration of B.
FIG. 6 is a cross-sectional view taken along the line B ′ of FIG.

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

FIG. 8 shows a third embodiment of the present invention,
FIG. 3A is a plan view of an active matrix substrate which constitutes an active matrix type liquid crystal display panel of a three-terminal element provided in the liquid crystal display device of the present embodiment, and FIG.
Is a sectional view taken along the line C-C ', and (c) is a C of another configuration.
It is a C'line arrow sectional view.

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 sectional view taken along the line DD ',
(C) is a DD 'line sectional view of another structure.

FIG. 10 shows a fifth embodiment of the present invention,
(A) is a plan view of an active matrix substrate which constitutes an active matrix type liquid crystal display panel of a two-terminal element provided in the liquid crystal display device of the present embodiment;
Is a sectional view taken along the line EE ′ of FIG.
FIG. 6 is a sectional view taken along the line E ′ of FIG.

FIG. 11 shows a sixth embodiment of the present invention,
FIG. 3A is a plan view of an active matrix substrate which constitutes an active matrix type liquid crystal display panel of a three-terminal element provided in the liquid crystal display device of the present embodiment, and FIG.
Is a cross-sectional view taken along the line FF ′, and FIG.
FIG. 6 is a cross-sectional view taken along the line −F ′ of the arrow.

12 (a) to (c) are the same as those of Example 1, but (d) to
(F) shows Example 2 and (g) to (i) show Example 3, which are the liquid crystal display device of the example, the conventional reflective liquid crystal display device, and the conventional transmissive liquid crystal display device, respectively. 3 is a graph showing a correlation among power consumption, visibility in a bright place, and visibility in a dark place.

13 (a) to 13 (c) are diagrams of Embodiment 4 and (d) to FIG.
(F) shows Example 5 and (g) to (i) show Example 6, which are the liquid crystal display device of the example, the conventional reflective liquid crystal display device, and the conventional transmissive liquid crystal display device, respectively. 3 is a graph showing a correlation among power consumption, visibility in a bright place, and visibility in a dark place.

14A and 14B show Example 7 and FIG. 14A is a graph showing the relationship between the area of a reflective electrode portion for one pixel region of a liquid crystal display device of Example and the 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 embodiment and the visibility in a dark place.

FIG. 15 shows Example 8 in which (a) is a graph showing the reflectances of the TN liquid crystal mode, PDLC mode, and GH mode in comparison, and (b) is the TN liquid crystal mode, P.
It is a graph which compares and shows the transmissivity 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 part 6b Reflective electrode part 7 color filters 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 part 14b Reflective electrode part 16 MIM element 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 part 24b Reflective electrode part 25 TFT element

Claims (5)

(57) [Claims] 1. A pair of transparent substrates which are arranged to face 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 facing surfaces of these 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, which is a unit of display in an electrode layer formed on one transparent substrate , and At the pixel
The reflective electrode part and the transparent electrode part are placed between the adjacent pixels.
Liquid crystal display device characterized by being adjacent to different types of electrode portions . 2. A pair of transparent substrates which are arranged to face 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 facing surfaces of these 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 that is a unit of display in an electrode layer formed on one transparent substrate, and The liquid crystal display device, wherein the reflective electrode portion and the transparent electrode portion are electrically independent. 3. A color filter for color display between said pair of transparent substrates is provided, in claim 2, characterized in that the color tone of the color filter is different between the reflective electrode part transparent electrode portion The described liquid crystal display device. 4. The liquid crystal display device according to claim 2 , wherein the 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 2 , wherein the reflective electrode portion and the transparent electrode portion in each pixel are adjacent to different types of electrode portions between adjacent pixels.