CN1885099A - Dual-mode driving transflective liquid crystal display device - Google Patents

Abstract

An electrode layer of the transflective liquid crystal display device can respectively correspond to the voltage-light transmittance of the transflective liquid crystal display panel or the voltage-light reflectance of the reflective display mode when the transflective liquid crystal display panel is in the transmissive or reflective display mode, so as to respectively provide different gray scale voltages to the transflective liquid crystal display panel, and the transflective liquid crystal display panel can be suitable for different voltage-light transmittance/reflectance curves to display gray scales under different display modes.

Description

Dual-mode driving transflective liquid crystal display device

technical field

The invention relates to a dual-mode driving transflective liquid crystal display device, in particular to a technique for making the transflective liquid crystal display produce the best image by using different grayscale voltages.

Background technique

Please refer to FIG. 1 . FIG. 1 is a schematic cross-sectional view of a semi-reflective liquid crystal display device 2 in the prior art. The semi-reflective liquid crystal display device 2 can use two kinds of light sources to display the light required for the picture. When the ambient light is sufficient, the light from above is reflected by the semi-reflective layer 4 to form reflected light L1, which passes through the liquid crystal layer 6 for image display. When the ambient light is insufficient, the light source module 8 can be turned on to provide the penetrating light L2, which penetrates the semi-reflective layer 4 and then the liquid crystal layer 6 for image display.

For a thin film transistor liquid crystal display (TFT LCD), it has upper and lower electrode layers 5, 10, wherein the lower electrode layer is a driving array layer, and for a super twisted nematic liquid crystal display, its lower electrode layer 10 is an ITO electrode layer In the case of a thin film transistor liquid crystal display, the lower electrode layer 10 is a transistor layer.

In the field of the prior art of semi-reflective liquid crystal displays, the semi-reflective layer can be arranged in many different positions. Generally speaking, the semi-reflective layer can be arranged between the driving array layer and the liquid crystal layer of the liquid crystal display, or between the lower substrate and the liquid crystal layer. Between the driving array layers, a thin film may also be attached to the lower side of the lower substrate. Taking TFT-LCD as an example, the semi-reflective layer can be arranged between the TFT layer and the liquid crystal layer of the LCD, or between the lower substrate and the TFT layer, or attached in the form of a thin film to the lower side of the lower substrate. Taking the super twisted nematic liquid crystal display as an example, the semi-reflective layer is disposed between the lower substrate and the ITO electrode layer, or disposed between the lower substrate and the ITO electrode layer, or attached to the lower side of the lower substrate in the form of a film.

Fig. 1 temporarily takes a thin film transistor liquid crystal display as an illustration. The semi-reflective layer is attached and arranged on the lower surface of the lower substrate as an example to illustrate the structure and light path conditions of the existing semi-reflective liquid crystal display device 2. Other semi-reflective layering methods I won't go into details.

Returning to Fig. 1 again, the liquid crystal layer 6 is disposed between the upper substrate 14 and the lower substrate 12, and the outer sides of the upper and lower substrates 14, 12 are respectively attached with upper and lower polarizers 16, 18, and the semi-reflective layer 4 is attached to between the lower glass substrate 12 and the lower polarizer 18 . Corresponding polarization modes are respectively provided through the upper and lower polarizers 16 and 18, so that polarized light in a predetermined direction passes through.

The liquid crystal layer 6 contains a plurality of liquid crystal molecules 602 , and the voltage generated by the upper and lower electrode layers 5 and 10 forms an electric field in the liquid crystal layer 6 to change the arrangement direction of the liquid crystal molecules 602 . The alignment directions of different liquid crystal molecules 602 can control the direction of polarized light, and cooperate with the above-mentioned upper and lower polarizers 16 and 18 to jointly determine the light transmittance of the semi-reflective liquid crystal display device 2 . Different voltages can cause the liquid crystal display device to display different light transmittances and produce various gray scale changes.

The liquid crystal display panel in the liquid crystal display device can be connected to a control system (not shown in the figure), which has the grayscale-voltage information of the panel, and outputs the signal to the upper and lower electrode layers of the liquid crystal panel for the grayscale output signal to be displayed. The electric field generated by the upper and lower electrode layers drives the liquid crystal molecules, so that the liquid crystal panel displays the desired gray scale.

Please refer to FIG. 2 . FIG. 2 is a graph showing the relationship between light penetration/reflectivity and voltage in the transmission mode and the reflection mode in the prior art. When the semi-reflective liquid crystal display device 2 provides the required grayscale brightness of the display screen by reflecting the light L1, it is in a reflection mode, and the ratio of the light passing through the liquid crystal layer and the upper polarizer before and after is called the reflectance. When the semi-reflective liquid crystal display device 2 provides the required grayscale brightness of the display screen by passing through the light L2, it is in a transmission mode, and the ratio of the light passing through the liquid crystal layer and the front and back of the upper and lower polarizers is called the transmittance.

Note that the two graphs in the figure require different voltages for the same light penetration/reflectivity. In terms of the characteristics of the curve, in the gray scale areas Z1 and Z2 that can be displayed in the reflection mode and the transmission mode, the product of the slope α2 of the transmission mode and the slope α1 of the reflection mode is a negative value (α1*α2 <0).

It can be known from FIG. 2 that if a voltage is applied to the liquid crystal display panel, the gray scales caused by the reflective mode and the transmissive mode are different. If the voltage can cause gray scales with high reflectivity in reflective mode, it will cause gray scales with lower transmittance in transmissive mode, and vice versa. The resulting difference in transmittance/reflectance is called grayscale aliasing, and this phenomenon will lead to poor display image quality.

In order to improve the problem of grayscale confusion, in the prior art, one or more layers of optical compensation films (not shown in the figure) are arranged between the upper and lower polarizers 16 and 18. Designed to make the voltage-transmission/reflectance curve relationship diagrams of the aforementioned two display modes tend to be similar, so that the slopes α1 and α2 of the two curves are both positive or negative, so as to improve gray scale confusion .

However, even though the two curves tend to be similar, they are still slightly different, limiting the improvement. In addition, the addition of optical compensation film not only increases the number of elements, but also affects the light display efficiency, and because of the design of different phase retardation in the liquid crystal layer, it will increase additional costs and burdens in manufacturing, and due to the above-mentioned various compensation designs , so that the display effect of the original design is indirectly affected, resulting in poor display quality.

Therefore, the main purpose of the present invention is to provide a dual-mode driving transflective liquid crystal display device, which can solve the problem of gray scale confusion without compensation design.

Contents of the invention

The purpose of the present invention is to design a transflective liquid crystal display device with dual-mode driving, which provides appropriate voltages in the transmissive mode and the reflective mode respectively, so as to solve the problem of gray scale confusion in an accurate and effective manner.

The present invention is a dual-mode driven transflective liquid crystal display device, which includes a transflective liquid crystal display panel with two display modes of reflection and transmissive, and a control system, which can control the transflective The liquid crystal display panel provides different gray scale voltages to the transflective liquid crystal display panel according to different display modes according to the gray scale to be displayed by the transflective liquid crystal display panel. When the transflective liquid crystal display panel uses the transmissive mode, the control system provides a transmissive grayscale voltage. And when the transflective liquid crystal display panel uses the reflective mode, another reflective grayscale voltage can be provided to the transflective liquid crystal display panel. The transmissive/reflective grayscale voltage enables the transflective liquid crystal display panel to accurately display the desired grayscale regardless of whether it is in the transmissive mode or in the reflective mode, without confusion.

The transflective liquid crystal display panel of the present invention includes upper and lower substrates, a liquid crystal layer, a semi-reflective layer, an upper and lower electrode layer, and a light source module.

Ambient light can be reflected through the semi-reflective layer to form a reflected light, and the light from the light source module can pass through to form a penetrating light, which can cooperate with the reflected light to form a reflection mode, and cooperate with the penetrating light to form a penetrating light. model.

The upper and lower electrode layers are respectively disposed between the liquid crystal layer and the upper and lower substrates. The lower electrode layer is a driving array, which can provide different grayscale voltages to the liquid crystal display panel in response to different display modes, so that the liquid crystal The layer can accurately display the gray scale to be displayed in different display modes. In the thin film transistor liquid crystal display, the driving array is a transistor layer, in the thin film diode liquid crystal display, the driving array is a diode layer, in the super twisted nematic liquid crystal display, the driving array is The arrays are ITO electrodes.

The control system of the dual-mode driving transflective liquid crystal display device may also include a light sensing device for sensing the ambient light intensity outside the transflective liquid crystal display device, and the control system controls the light source module according to the ambient light intensity When the light source module is turned on, the transflective liquid crystal display device is in the transmissive mode, and when the light source module is turned off, the transflective liquid crystal display device is in the reflective mode. And the control system sends the gray scale voltage corresponding to the display mode to the transflective liquid crystal display device according to the display mode.

To further illustrate, the control system further includes a storage device for storing a comparison value. Wherein, when the ambient light intensity sensed by the light sensing device exceeds the comparison value, the control system turns off the light source module. At this time, the transflective liquid crystal display device is in the reflective mode, which reflects ambient light as a display light source, and the control system applies a The grayscale voltage is given to the upper and lower electrode layers of the transflective liquid crystal display device, and the grayscale voltage can make the transflective liquid crystal panel in reflective mode display predetermined grayscale. When the ambient light intensity sensed by the light sensing device does not exceed the comparison value, the control system turns on the light source module. At this time, the transflective liquid crystal display device is in the transmissive mode, and the light source module is used as the display light source, and the control system implements A grayscale voltage is given to the upper and lower electrode layers of the transflective liquid crystal display device, and the grayscale voltage can make the transflective liquid crystal panel in reflective mode display a predetermined grayscale. In addition to controlling the on/off of the light source module, the aforementioned control system can also adjust the intensity of the light source according to the intensity of the ambient light. That is, when the ambient light is lower than the comparison value, the control system turns on the light source module. At this time, because the ambient light still exists, the control system adjusts the light source module to provide a light source with a brightness greater than the ambient light, so that the observer can perceive the penetration more strongly. The gray scale displayed by the mode will not be confused with the gray scale of the reflection mode caused by ambient light. This kind of brightness-adjustable light source module and its matching method can achieve the effect of power saving.

The dual-mode driven transflective liquid crystal display device of the present invention can also be directly controlled by the control system to turn on/off the light source module without passing through the light sensing device. When the light source module is turned on, the control system applies a transmissive grayscale voltage to the upper and lower electrode layers of the transflective liquid crystal display panel for the grayscale to be displayed. When the light source module is turned off, the control system applies gray scale voltages in reflective mode to the upper and lower electrode layers of the transflective liquid crystal display panel for the gray scale to be displayed. At this time, the control system controls the brightness of the light source module according to different states, which also has the effect of saving power.

In addition, the transflective liquid crystal display device also includes upper/lower substrates and upper/lower polarizers. The upper/lower substrates are used to clamp the above-mentioned various components except the light source module and the light sensing device. The upper/lower polarizers are respectively attached to the outer surfaces of the upper/lower substrates, and are used to pass polarized light in a predetermined direction corresponding to a predetermined polarization mode.

The aforementioned semi-reflective layer has multiple configuration positions. If in a thin film transistor liquid crystal display, the lower electrode layer is a thin film transistor layer, the semi-reflective layer can be configured on the thin film transistor layer, and between the thin film transistor layer and the liquid crystal. Between layers, or between the thin film transistor layer and the underlying substrate. In addition, the semi-reflective layer may also be disposed on the lower side of the lower substrate. In a super twisted nematic liquid crystal display, the electrode layer is an ITO electrode layer, and the semi-reflective layer is disposed between the lower substrate and the ITO electrode layer.

Therefore, through the dual-mode driving transflective liquid crystal display device of the present invention, the problem of gray scale confusion can be effectively solved by applying appropriate voltages in conjunction with the transmissive mode and the reflective mode.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

1 is a schematic cross-sectional view of a semi-reflective liquid crystal display device in the prior art;

FIG. 2 is a graph showing the relationship between light transmittance and voltage in reflection mode and transmission mode in the prior art;

3 is a schematic cross-sectional view of a first embodiment of a dual-mode driven transflective liquid crystal display device of the present invention;

4 is a schematic cross-sectional view of a second embodiment of a dual-mode driven transflective liquid crystal display device of the present invention;

5 is a schematic cross-sectional view of a third embodiment of a dual-mode driven transflective liquid crystal display device of the present invention;

6 is a schematic cross-sectional view of a wide viewing angle film of a dual-mode driven transflective liquid crystal display device of the present invention;

7 is a schematic cross-sectional view of a diffuser of a dual-mode driven transflective liquid crystal display device of the present invention;

FIG. 8 is a schematic diagram of controlling a unit pixel with two circuit units in the present invention; and

Fig. 9 is a side sectional view of the circuit unit of the present invention.

simple notation

L1: reflected light L2: penetrating light

2, 30: semi-reflective liquid crystal display device

32: Transflective LCD panel

14, 34: upper substrate

12, 36: Lower substrate 6, 38: Liquid crystal layer

602, 3802: liquid crystal molecules 4, 40: semi-reflective layer

10, 42: Lower electrode layer 5, 15: Upper electrode layer

16, 44: Upper polarizer 45: Control system

18, 46: lower polarizer 47: light sensing device

48: storage device 8, 50: light source module

60: Upper wide viewing angle film 62: Lower wide viewing angle film

70: scattered layer 80: unit pixel

82: Circuit unit 4002: Reflector

4004: Through hole 90: Thin film transistor

92: storage capacitor 94: first metal layer

96: Second metal layer 98: Dielectric layer

Detailed ways

The structure of the dual-mode driven transflective liquid crystal display device of the present invention can be composed of the following embodiments.

First embodiment:

Please refer to FIG. 3 . FIG. 3 is a schematic cross-sectional view of a first embodiment of a dual-mode driving transflective liquid crystal display device 30 of the present invention. The dual-mode driving transflective liquid crystal display device of the first embodiment takes a thin film transistor liquid crystal display (Thin Film Transistor LCD; TFT LCD) as an example, and the corresponding lower electrode layer 42 is a thin film transistor layer. The dual-mode driving transflective liquid crystal display device 30 includes a light source module 50 and a transflective liquid crystal display panel 32 . The transflective liquid crystal display panel 32 is composed of upper and lower substrates 34, 36 sandwiching a liquid crystal layer 38, and upper and lower electrode layers 15, 42, and is attached to the upper and lower polarizers 44, 46 respectively. Outer side surfaces of the lower substrates 34 , 36 .

The liquid crystal layer 38 includes a plurality of liquid crystal molecules 3802 . The upper and lower electrode layers 15 , 42 are disposed above and below the liquid crystal layer 38 , and the semi-reflective layer 40 is disposed on the lower side of the lower glass substrate 36 in a sticking manner, and is interposed between the lower polarizer 46 and the lower substrate 36 .

The light source module 50 is arranged under the liquid crystal display panel 32 , and the light source module 50 in the turned-on state is used to provide a penetrating light, and the penetrating light passes through the transflective liquid crystal display panel 32 to display images on the upper surface of the liquid crystal display panel 32 .

The semi-reflective layer 40 can allow the penetrating light to pass upward from the bottom, and can also allow the light from above to reflect back. A reflective mode is formed in cooperation with the reflected light, and a transmission mode is formed in cooperation with the transmitted light.

The upper polarizer 44 is used to provide a first polarization mode, allowing polarized light in a predetermined direction to pass through. The lower polarizer 46 is used to provide a second polarizing mode, allowing polarized light in a predetermined direction to pass through. The upper and lower electrode layers 15 and 42 provide voltages to generate an electric field in the liquid crystal layer 38 to control the alignment of the liquid crystal molecules 3802 . At the same time, the upper and lower polarizers 44 and 46 are matched to jointly determine the light transmittance of the semi-reflective liquid crystal display device 30 .

First, test the light penetration/reflectivity and voltage relationship curves of the transmission mode and the reflection mode as shown in Figure 2, that is, you can know the corresponding voltage of each gray level in the transmission mode, and the corresponding voltage of each gray level in the reflection mode. The corresponding voltage of the level, and store the penetrating gray scale voltage and reflected gray scale voltage in a control system 45 . The control system 45 can deliver voltage to the transflective liquid crystal display panel, so that the transflective liquid crystal display panel can display the desired image. And when the transflective liquid crystal display panel is in the transmissive display mode, the control system 45 sends out the gray scale corresponding voltage of the transmissive mode; The level corresponds to the voltage, so that the transflective liquid crystal display panel can still accurately display the gray scale to be displayed in different display modes.

Further, the control system 45 has a storage device 48 and a light sensing device 47, and the storage device 48 stores a comparison value. The light sensing device 47 is used to sense the ambient light intensity outside the transflective liquid crystal display device 30. When the ambient light intensity sensed by the light sensing device 47 exceeds the comparison value, it means that the ambient light is bright, and the transflective liquid crystal display panel It is suitable to be in the reflective mode. At this time, the control system 45 turns off the light source module, so that the transflective liquid crystal display device 30 enters the reflective mode. When the ambient light intensity sensed by the light sensing device 47 does not exceed the comparison value, it means that the ambient light is dim and the transflective liquid crystal display panel is suitable to be in the transmissive mode, and the control system 45 turns on the light source module to make the transflective liquid crystal display panel 30 to enter penetration mode.

The control system 45 can control the light source module to provide light with different brightness to penetrate the reflective liquid crystal display panel, so as to be suitable for various environments and conditions.

It is supplemented that the semi-reflective layer 40 in the first embodiment can be formed by laminating multiple layers of films with different refractive indices to form the semi-reflective layer 40 so as to control the light penetration and reflection of the semi-reflective layer 40. , such as DBEF, CBEF, etc. In addition, the semi-reflective layer 40 in the first embodiment can also be coated with a metal or non-metal having a reflective effect by means of coating, and the thickness of the semi-reflective layer 40 can be controlled to control the ratio of transmission and reflection.

Second embodiment:

Please refer to FIG. 4 . FIG. 4 is a schematic cross-sectional view of a second embodiment of a dual-mode driving transflective liquid crystal display device 30 of the present invention. The dual-mode driving transflective liquid crystal display device of the second embodiment is a thin film transistor liquid crystal display (Thin Film Transistor LCD; TFT LCD), and the corresponding lower electrode layer 42 is a thin film transistor layer. The functions of various components in the second embodiment are the same as those in the first embodiment, and will not be repeated here. The difference is the location of each component configuration, as described below.

The transflective liquid crystal display panel 32 is also sandwiched by upper and lower substrates 34, 36 with a liquid crystal layer 38, a semi-reflective layer 40, and an upper and lower electrode layer 15, 42, and the upper and lower polarizers 44, 46 are respectively attached and set on the outer surfaces of the upper and lower substrates 34 , 36 .

Wherein, the lower electrode layer 42 is adjacently disposed under the liquid crystal layer 38 . The semi-reflective layer 40 is disposed on the upper surface of the lower electrode layer 42 , that is to say, the semi-reflective layer 40 is interposed between the lower electrode layer 42 and the liquid crystal layer 38 .

Also, by outputting the gray-scale voltage corresponding to the display mode in different display modes, the problem of gray-scale confusion can be solved.

Third embodiment:

Please refer to FIG. 5 . FIG. 5 is a schematic cross-sectional view of a third embodiment of a dual-mode driving transflective liquid crystal display device 30 of the present invention. The dual-mode driving transflective liquid crystal display device of the third embodiment uses a color super twisted nematic liquid crystal display (Color Super Twisted Nematic LCD; CSTN LCD) or a super twisted nematic liquid crystal display (Super Twisted Nematic LCD; STN LCD). The difference between the third embodiment and the first and second embodiments is that the semi-reflective layer 40 is disposed between the lower substrate 36 and the lower electrode layer 42 .

The third specific embodiment also solves the problem of gray scale confusion by outputting gray scales corresponding to the modes in different modes.

In conjunction with the first embodiment shown in FIG. 3 , please refer to FIG. 6 . FIG. 6 is a schematic cross-sectional view of a dual-mode driven transflective liquid crystal display device 30 with wide viewing angle films 60 and 62 according to the present invention. Like the dual-mode driving transflective liquid crystal display device 30 of the first embodiment, the transflective liquid crystal display panel 32 also includes an upper wide view film (wide view film) 60 and a lower wide view film (wide view film) 62 , where the upper wide viewing angle film 60 and the lower wide viewing angle film 62 need to be attached to the outer surfaces of the upper and lower substrates 34, 36, respectively, so that the upper polarizer 44, the semi-reflective layer 40 and the upper and lower substrates 34, Between 36. The upper and lower wide viewing angle films 60 and 62 are arranged in the transflective liquid crystal display device 30 and have the function of widening the viewing angle range of the liquid crystal display panel.

In other second and third embodiments, the upper and lower wide viewing angle films 60, 62 can be set, but the semi-reflective layer 40 of the second embodiment and the third embodiment is all between the upper and lower substrates 34, 36, so The upper and lower wide viewing angle films 60 , 62 are respectively attached to the outer surfaces of the upper and lower substrates 34 , 36 and between the upper and lower polarizers 44 , 46 and the upper and lower substrates 34 , 36 .

In addition, referring to the first embodiment of FIG. 3 , please refer to FIG. 7 . FIG. 7 is a schematic cross-sectional view of a dual-mode driving transflective liquid crystal display device 30 with a scattering layer 70 according to the present invention. The transflective liquid crystal display panel 32 of the dual-mode driving transflective liquid crystal display device 30 is further equipped with a scattering layer 70, which can reflect light uniformly and reduce the problem of mirror reflection. In the first embodiment of FIG. 3 , the scattering layer 70 can be disposed between the lower substrate 36 and the semi-reflective layer 40 , or disposed on the upper or lower side of the upper polarizer 44 .

In the second and third embodiments, since the semi-reflective layer 40 is between the upper and lower substrates 34, 36, the scattering layer 70 can be disposed on the upper or lower side of the upper polarizer 44, that is, above the semi-reflective layer 40, It can also be disposed adjacent to the lower side of the semi-reflective layer 40 . The scattered layer can be a diffusion material, a diffusion sheet, a diffusion glue or a scattered structure, all of which have the effect of uniform light. Further, in accordance with the first embodiment, with the upper and lower wide viewing angle films 60 , 62 , the scattering layer 70 can be placed between the lower wide viewing angle film and the semi-reflective layer 40 . To match all the embodiments, a random layer 70 is disposed between the upper wide viewing angle film 60 and the upper polarizer 44 , or disposed on the upper polarizer 44 .

Please refer to FIG. 8 for the dual-mode driving transflective liquid crystal display according to FIG. 4 , wherein the lower electrode layer 42 described later is described as a thin film transistor layer. FIG. 8 is a schematic diagram of the present invention using two circuit units 82 to control a unit pixel 80 . The color transflective liquid crystal display device 30 utilizes a color filter (not shown) to display colors, and the color filter is composed of many unit pixels 80, such as red unit pixels (R), blue unit pixels (B ), green unit pixel (G). Furthermore, the semi-reflective layer 40 is composed of many reflective sheets 4002 and through holes 4004 , generally arranged at equal intervals, but the through holes 4004 can also be randomly arranged in the entire semi-reflective layer 40 . Wherein, the reflective sheet 4002 is used to reflect light from above to form reflected light, and the through hole 4004 allows light from the light source module 50 to pass through to form penetrating light.

In general, one circuit unit 82 may be provided for projection of one unit pixel 80 . The present invention can be a further embodiment, that is, in the projection of the same unit pixel 80 , there are two circuit units 82 in the thin film transistor layer 42 , which respectively project the corresponding reflector 4002 and the through hole 4004 . As a supplementary note, the two circuit units 82 in FIG. 8 are respectively projected to correspond to the reflector 4002 and the through hole 4004. In practice, the circuit unit 82 can be arranged on the same side (as in the vertical projection area of the reflector 4002). The non-projection parts of the unit 82 only need to correspond to the reflective sheet 4002 and the through hole 4004 respectively.

For further description, please refer to FIG. 9 , which is a side cross-sectional view of the circuit unit 82 of the present invention. The circuit unit 82 of the thin-film transistor layer 42 in the dual-mode driving transflective liquid crystal display includes a thin-film transistor 90 and a storage capacitor 92. Under the same process step, the first metal layer is formed on the thin-film transistor 90 and the storage capacitor 92 respectively. 94. In addition, in another process step, a second metal layer 96 is formed on the thin film transistor 90 and the storage capacitor 92 at the same time, and a dielectric layer 98 is disposed therebetween.

The first metal layer 94 forms a gate in the TFT 90 , and the second metal layer 96 forms a drain and a source in the TFT 90 . The first metal layer 94 and the second metal layer 96 form the main structure of the capacitor in the storage capacitor 92 . Wherein, since the area where the thin film transistor 90 and the storage capacitor 92 exist has a different phase delay from other areas, gray scale aliasing will be caused. The existing technology improves this phenomenon by adjusting the phase retardation of the liquid crystal layer. The present invention uses the corresponding gray-scale voltages in the transmissive mode and the reflective mode to provide the required gray-scale display and solve the gray-scale confusion phenomenon. Therefore, the first metal layer 94 or the second metal layer 96 in the storage capacitor 92 can be used as the reflector 4002 without adding additional manufacturing cost to the element, which not only saves the cost of the element, but also can be manufactured immediately A reflective area is formed for use in case of flow.

In addition, the ratio of reflected light can be controlled by adjusting the size of the first metal layer 94 or the second metal layer 96 in the storage capacitor 92 . In particular, if the first metal layer 94 or the second metal layer 96 in the storage capacitor 92 is used as the reflector 4002, strictly speaking, the semi-reflective layer 40 is made in the thin film transistor layer 42, but it is the same as that described in FIG. The spirit of the second embodiment is the same as that of the second embodiment, and the semi-reflective layer 40 is interposed between the thin film transistor layer 42 and the liquid crystal layer 38 according to this embodiment, so it is not necessary to describe it in a new embodiment.

As a supplementary note, the thickness of the semi-reflective layer 40 in the second and third embodiments can be controlled to control the ratio of transmission and reflection. In addition, referring to FIG. 9, the semi-reflective layer 40 described in conjunction with the second embodiment is a semi-reflective layer 40 with a reflective sheet 4002 and a through hole 4004. By controlling the size of the reflective sheet 4002 and the through hole 4004, the through hole can be controlled. ratio of transmission and reflection.

In addition, a plurality of bumps can be provided on the dielectric layer 98 of the circuit unit 82 to make the light uniform. In this way, the effect of the scattering layer can be replaced, or together with the scattering layer, a more uniform effect of light can be exerted.

Therefore, the transflective liquid crystal display device 30 can apply a transmissive grayscale voltage to the circuit unit 82 corresponding to the through hole 4004 , and apply a reflective grayscale voltage to the circuit unit 82 corresponding to the reflective sheet 4002 . In this way, the effect of the reflection mode of the reflection sheet 4002 can be utilized in the transmission mode at the same time, and the reflection mode generated by the reflection sheet 4002 and the transmission mode generated by the through hole 4004 can be fully utilized, so that the semi-reflective liquid crystal display device 30 can be obtained. The better light utilization rate can also save the power consumption of the light source module to achieve the effect of power saving.

To further illustrate, the present invention does not change the voltage-transmittance curve of the transflective liquid crystal display in the transmissive mode and the voltage-reflectance curve in the reflective mode. In the displayable gray scale areas Z1 and Z2, The product of the slope α2 of the transmission mode curve and the slope α1 of the reflection mode curve still maintains a negative value (α1*α2<0).

It is supplemented that the dual-mode driving transflective liquid crystal display device 30 of the present invention is particularly suitable for color super twisted nematic liquid crystal display (Color Super Twisted Nematic LCD; CSTN LCD), super twisted nematic liquid crystal display (Super Twisted Nematic; STN LCD), thin film transistor liquid crystal display (Thin Film Transistor LCD; TFT LCD), and thin film diode liquid crystal display (Thin Film Diode LCD; TFD LCD), twisted nematic liquid crystal display (TN LCD), low temperature Polysilicon thin film transistor liquid crystal display (LTPS LCD), electronically controlled birefringent display (ECB LCD), hybrid twisted liquid crystal display, vertical alignment liquid crystal display (VALCD), in-plane switching liquid crystal display (IPS LCD).

Through the detailed description of the preferred specific embodiments above, it is hoped that the characteristics and spirit of the present invention can be described more clearly, rather than the scope of the present invention is limited by the preferred specific embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the appended claims of the present invention.

Claims (34)

1. A dual-mode driven transflective liquid crystal display device, comprising: One upper substrate; Look at the substrate; A liquid crystal layer sandwiched between the upper and lower substrates; an upper electrode layer, configured between the liquid crystal layer and the upper substrate; The lower electrode layer is arranged between the liquid crystal layer and the lower substrate, and the upper and lower electrode layers can apply a voltage to the liquid crystal layer; A semi-reflective layer, which provides a reflected light and a transmitted light through the semi-reflected layer, and the liquid crystal layer cooperates with the reflected light to form a reflection mode, and cooperates with the transmitted light to form a transmission mode; and the upper and lower electrodes The layer can apply different grayscale voltages in the transmission mode and the reflection mode, so that the transmission/reflectivity of the transmission mode and the reflection mode are the same; and the slope of each grayscale voltage and transmittance curve of the transmission mode , and the product of the slope of each grayscale voltage and reflectivity curve in the reflection mode is negative. 2. The dual-mode driving transflective liquid crystal display device according to claim 1, which is a color super twisted nematic liquid crystal display, a super twisted nematic liquid crystal display, a twisted nematic liquid crystal display, a thin film transistor liquid crystal display, And thin film diode liquid crystal display, low temperature polysilicon thin film transistor liquid crystal display, electronically controlled birefringence display, hybrid twist liquid crystal display, vertical alignment liquid crystal display, plane switching liquid crystal display. 3. The dual-mode driven transflective liquid crystal display device according to claim 1, the dual-mode driven transflective liquid crystal display device further comprising a light source module disposed under the lower substrate to provide a transmissive display light. 4. The dual-mode driving transflective liquid crystal display device as claimed in claim 3, further comprising a light sensing device for sensing the intensity of ambient light, and turning on/off the light source module according to the intensity. 5. The dual-mode driving transflective liquid crystal display device according to claim 1, further comprising: an upper polarizer disposed on the upper side of the upper substrate; and The lower polarizer is arranged on the lower side of the lower substrate. 6. The dual-mode driving transflective liquid crystal display device as claimed in claim 1, wherein the lower electrode layer is a driving array layer, and the semi-reflective layer is disposed on the driving array layer and interposed between the driving array layer layer and the liquid crystal layer. 7. The dual-mode driven transflective liquid crystal display device as claimed in claim 1, wherein the semi-reflective layer is disposed on the upper side of the lower substrate. 8. The dual-mode driven transflective liquid crystal display device as claimed in claim 1, wherein the semi-reflective layer is disposed on the lower side of the lower substrate. 9. The dual-mode driving transflective liquid crystal display device according to claim 1, further comprising an upper wide viewing angle film and a lower wide viewing angle film, wherein the upper wide viewing angle film and the lower wide viewing angle film are respectively arranged adjacent to the upper substrate and the outer surface of the lower substrate. 10. The dual-mode driving transflective liquid crystal display device according to claim 1, further comprising a scattering layer, wherein the scattering layer is disposed above the semi-reflecting layer. 11. The dual-mode driving transflective liquid crystal display device as claimed in claim 1, further comprising a scattering layer, wherein the scattering layer is disposed immediately below the semi-reflecting layer. 12. The dual-mode driving transflective liquid crystal display device according to claim 10 or 11, wherein the scattering layer comprises a diffusion material, a diffusion sheet, a diffusion glue or a scattering structure. 13. The dual-mode drive transflective liquid crystal display device according to claim 3, wherein the light source module is turned off in the reflective mode and turned on in the transmissive mode. 14. The dual-mode driving transflective liquid crystal display device as claimed in claim 13, the light source module can provide light with different brightnesses when it is turned on. 15. The dual-mode driven transflective liquid crystal display device according to claim 6, the semi-reflective layer is composed of multiple reflective sheets and multiple through holes, the driving array layer is composed of multiple circuit units, each The display area controlled by the two circuit units forms a unit pixel, and each unit pixel has an area corresponding to the reflector and the through hole respectively, and the two circuit units respectively control the area corresponding to the through hole and the reflector, and the through hole corresponds to the area The corresponding circuit unit can apply a penetrating grayscale voltage, and the circuit unit corresponding to the reflective sheet can apply a reflected grayscale voltage. 16. A dual-mode driven transflective liquid crystal display device, comprising: A transflective liquid crystal display panel, which has two display modes: reflective and transmissive; A control system can provide a transmissive gray-scale voltage for the transflective liquid crystal display panel in the transmissive mode, and provide a reflective gray-scale voltage in the reflective mode, and the voltage corresponding to the transmissive gray-scale voltage - In the gray-scale area of the transmittance curve, the slope product of the voltage-reflectance curve gray-scale area corresponding to the reflected gray-scale voltage is a negative value. 17. The dual-mode driven transflective liquid crystal display device according to claim 16, wherein the transflective liquid crystal display panel is selected from a color super twisted nematic liquid crystal display panel, a super twisted nematic liquid crystal display panel, Twisted nematic liquid crystal display panels, thin film transistor liquid crystal display panels, and thin film diode liquid crystal display panels, low temperature polysilicon thin film transistor liquid crystal display panels, electronically controlled birefringent display panels, hybrid twisted liquid crystal display panels, vertical alignment liquid crystal display panels , Plane switchable liquid crystal display panel. 18. The dual-mode driving transflective liquid crystal display device according to claim 16, wherein the transflective liquid crystal display panel further comprises a light source module disposed under the transflective liquid crystal display panel for providing a transflective The transflective liquid crystal display panel-a penetrating display light source. 19. The dual-mode driving transflective liquid crystal display device according to claim 18, the control system can control the light source module to be turned on/off. 20. The dual-mode driving transflective liquid crystal display device as claimed in claim 16, the control system further comprises a light sensing device for sensing the intensity of ambient light. 21. The dual-mode driven transflective liquid crystal display device according to claim 16, wherein the transflective liquid crystal display panel further comprises: One upper substrate; Look at the substrate; A liquid crystal layer sandwiched between the upper and lower substrates; an upper electrode layer, configured between the liquid crystal layer and the upper substrate; The lower electrode layer is arranged between the liquid crystal layer and the lower substrate; an upper polarizer disposed on the upper side of the upper substrate; and The lower polarizer is arranged on the lower side of the lower substrate. 22. The dual-mode driving transflective liquid crystal display device according to claim 21, wherein the transflective liquid crystal display panel further comprises a semi-reflective layer disposed on the lower electrode layer between the lower electrode layer and the between the liquid crystal layers. 23. The dual-mode driving transflective liquid crystal display device as claimed in claim 22, wherein the lower electrode layer is a driving array layer. 24. The dual-mode driving transflective liquid crystal display device as claimed in claim 21, wherein the transflective liquid crystal display panel further comprises a semi-reflective layer, and the semi-reflective layer is disposed on the upper side of the lower substrate between Between the lower substrate and the lower electrode layer. 25. The dual-mode driving transflective liquid crystal display device as claimed in claim 21, wherein the transflective liquid crystal display panel further comprises a semi-reflective layer, and the semi-reflective layer is disposed on the lower side of the lower substrate. 26. The dual-mode driving transflective liquid crystal display device according to claim 21, the transflective liquid crystal display device further comprises an upper wide viewing angle film and a lower wide viewing angle film, wherein the upper wide viewing angle film and the lower wide viewing angle film Films are disposed proximate to outer surfaces of the upper substrate and the lower substrate, respectively. 27. The dual-mode driving transflective liquid crystal display device according to claim 22, 24 or 25, the transflective liquid crystal display device further comprises a scattering layer, wherein the scattering layer is arranged on the semi-reflective layer Location. 28. The dual-mode driving transflective liquid crystal display device according to claim 22, the transflective liquid crystal display device further comprising a scattering layer, wherein the scattering layer is disposed adjacent to the lower side of the semi-reflecting layer. 29. The dual-mode driving transflective liquid crystal display device according to claim 27 or 28, wherein the scattering layer comprises a diffusion material, a diffusion sheet, a diffusion glue or a scattering structure. 30. The dual-mode driving transflective liquid crystal display device according to claim 20, the control system further comprises a storage device, the storage device is used to store a comparison value, wherein the ambient light intensity sensed by the light sensing device When the comparison value is exceeded, the control system turns off the light source module, and the control system provides the reflection mode grayscale voltage of the transflective liquid crystal display panel, and when the ambient light intensity sensed by the light sensing device does not exceed the comparison value, the control system turns on The light source module, and the control system provides the transmissive mode grayscale voltage of the transflective liquid crystal display panel. 31. The dual-mode driven transflective liquid crystal display device as claimed in claim 30, the light source module can provide light with different brightnesses when it is turned on. 32. The dual-mode driven transflective liquid crystal display device according to claim 19, the light source module is in the off state in the reflective mode, and is in the on state in the transmissive mode. 33. The dual-mode driven transflective liquid crystal display device as claimed in claim 32, the light source module can provide light with different brightness when it is in the on state. 34. The dual-mode driving transflective liquid crystal display device as claimed in claim 23, wherein the semi-reflective layer is composed of a plurality of reflective sheets and a plurality of through holes, the driving array layer is composed of a plurality of circuit units, The display area controlled by every two circuit units forms a unit pixel, and each unit pixel has areas corresponding to the reflector and the through hole, and the two circuit units respectively control the areas corresponding to the through hole and the reflector, and the system controller The grayscale voltages of the transmission mode and the reflection mode can be provided through the circuit units corresponding to the through hole and the reflection sheet respectively.

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