CN103792743A - Blue phase liquid crystal display with low drive voltage and continuously-controllable visual angle - Google Patents

Abstract

The invention is a blue-phase liquid crystal display with low driving voltage and continuous controllable viewing angle. The composition of the display from top to bottom is as follows: upper polarizer, upper λ/2 biaxial film, upper λ/2 negative A wave plate , upper λ/4 positive A wave plate, upper glass substrate, first common electrode, first protective layer, blue phase liquid crystal layer, second protective layer, Pixel electrode layer, transparent bump layer, second common electrode, lower glass The substrate, the lower λ/4 negative A wave plate, the lower λ/2 positive A wave plate and the lower polarizer; the Pixel electrode layer is a first Pixel electrode 8 and a second Pixel electrode 9 arranged in parallel and spaced apart. The present invention effectively reduces the driving voltage, realizes the continuous control of the viewing angle by adjusting the voltage relationship between the first common electrode and the second common electrode, and makes the driving voltage of the blue phase liquid crystal display lower than 15V, even lower than 10V.

Description

A blue-phase liquid crystal display with low driving voltage and continuously controllable viewing angle

technical field

The present invention designs a device in the technical field of liquid crystal display, specifically a blue-phase liquid crystal display device with low driving voltage and continuously controllable viewing angle

Background technique

Information protection has been paid more and more attention by people. People need their portable devices such as mobile phones and tablet computers to have a function that can be controlled from a viewing angle so as to protect important information such as personal privacy in public places.

In recent years, blue-phase liquid crystal displays have developed rapidly, and people have discovered many advantages of blue-phase liquid crystal displays. For example, the production is simple, no alignment layer is required, the response speed is fast, the viewing angle is wide and the contrast ratio is high, etc. Making blue-phase liquid crystal displays is the goal that people are working hard for now.

Using a simple biaxial film, the blue phase liquid crystal display can easily realize wide viewing angle display. The full viewing angle contrast can reach more than 300, which can realize color display very well. However, it is still difficult to achieve a narrow viewing angle with a simple biaxial film while achieving a wide viewing angle. Currently there are several methods to realize the change of the wide and narrow viewing angles of the blue-phase liquid crystal display. For example, the pixel separation method, the method of double-layer liquid crystal cell or three-layer liquid crystal cell, and the use of temperature changes to achieve viewing angle control, etc. However, there are many problems in these methods, such as 1. The light utilization rate is low. The sub-pixel method divides a pixel into two parts, one part is used to display the main information, and one pixel is used to control the viewing angle, so the aperture ratio is low. The light utilization rate is directly reduced. 2. The cost is high. The use of double-layer liquid crystal or double-cell liquid crystal obviously adds a liquid crystal cell, which directly increases the cost. 3. The above methods still have the following common defects: the continuous control of the viewing angle cannot be realized, and there can only be one situation in the narrow viewing angle mode, such as applying a certain voltage or a certain temperature, and the viewing angle cannot be changed from wide to narrow Continuous change; the contrast ratio is low under the narrow viewing angle mode. Usually, the center contrast ratio is very low in the narrow viewing angle mode in the previous method, generally only about 100, or even less than 100, and the color display cannot be well realized. Moreover, due to the addition of the viewing angle control, It will even affect the viewing angle in the wide viewing angle mode, so that the wide viewing angle cannot be displayed normally; there will also be a problem of high driving voltage for blue-phase liquid crystal displays, and the usual blue-phase liquid crystal display equipment will have the problem of high driving voltage. The above method Only the change from wide viewing angle to narrow viewing angle can be obtained, and its driving voltage cannot be reduced.

Contents of the invention

The purpose of the present invention is to overcome the shortcoming existing in the prior art, has proposed a kind of on the basis of FIS mode blue phase liquid crystal display to increase protruding structure, and add a bias electrode on the upper substrate, the setting of protruding structure, The driving voltage of the blue-phase liquid crystal display is obviously reduced, and the driving voltage of the blue-phase liquid crystal display is reduced to below 10V, which can be accepted by the existing TFT. A bias voltage is applied on the common (Common) electrode on the bias electrode and the lower substrate to obtain a narrow viewing angle mode. However, due to the introduction of the raised structure, the bias voltage we applied, and the height of the raised, blue phase liquid crystal The thickness of the layer has a certain relationship: the bias voltage on the bias electrode of the upper substrate is a positive voltage, and the bias voltage on the Common electrode of the lower substrate is a negative voltage (or the bias voltage on the bias electrode of the upper substrate is a negative voltage). The bias voltage on the common electrode of the lower substrate is a positive voltage), and the ratio of the absolute value of the bias voltage on the upper and lower substrates is the thickness of the liquid crystal layer above the raised structure to the height of the raised structure. Through the introduction of the relationship between the bias electrode, the protrusion structure, and the applied voltage polarity and ratio, low driving voltage, continuous control of the viewing angle, and a single-gamma driving curve blue-phase liquid crystal display are realized. The invention solves the problems of the traditional viewing angle controllable blue-phase liquid crystal display, such as complex process, high cost, low contrast at narrow viewing angle, high driving voltage, inconsistent driving curve at wide viewing angle and driving curve at narrow viewing angle.

Technical scheme of the present invention is:

A blue-phase liquid crystal display with low driving voltage and continuous controllable viewing angle. Positive A wave plate, upper glass substrate, first common electrode, first protective layer, blue phase liquid crystal layer, second protective layer, pixel (Pixel) electrode layer, transparent bump layer, second common electrode, lower glass substrate, The lower λ/4 negative A wave plate, the lower λ/2 positive A wave plate and the lower polarizer; the pixel electrode layer is a first pixel electrode 8 and a second pixel electrode 9 arranged in parallel and spaced apart.

The first Common electrode, the second Common electrode, the first Pixel electrode or the second Pixel electrode are all transparent indium tin oxide (ITO) electrodes commonly used in thin film transistor liquid crystal displays; their voltages are respectively: under the wide viewing angle mode , the voltage on the first Common electrode and the second Common electrode is 0, the voltage on the first Pixel electrode and the second Pixel electrode are equal and opposite in polarity; in the narrow viewing angle mode, the first Common electrode and the second Common electrode apply pole The opposite and proportional voltages, the voltages of the first Pixel electrode and the second Pixel electrode are the same as those in the wide viewing angle mode.

In the narrow viewing angle mode, the voltages applied to the first Common electrode and the second Common electrode are respectively: a positive voltage is applied to the first Common electrode, and a negative voltage is applied to the second Common electrode. The specific ratio is Be: the ratio of the absolute value of the applied voltage on the first Common electrode to the absolute value of the applied voltage on the second Common electrode is the ratio of the thickness of the liquid crystal layer above the protrusion and the value of the height of the protrusion; or, apply a negative voltage to the first Common electrode. positive voltage, the absolute value of the positive voltage applied on the second Common electrode, the absolute value of the applied voltage on the first Common electrode and the absolute value of the applied voltage on the second Common electrode are the thickness of the liquid crystal layer above the protrusion and the protrusion Ratio of numeric values for height.

All the electrodes mentioned above have a thickness of 0.01-0.5 μm.

The transparent protrusions are transparent material silicon dioxide or organic materials commonly used in thin-film crystal light liquid crystal displays; the first Pixel electrodes and the second Pixel electrodes are located on the upper surface of the transparent protrusions, arranged at intervals, and their width, The length and shape are the same as the transparent protrusions;

The transparent protrusions are strip-like structures with a width of 1-15 μm, a length of a pixel, and a height of 0.3 to 15 μm, and the distance between adjacent transparent protrusions is 0.8 μm-14.8 μm. Its width and height can be adjusted according to the size of display pixels and the thickness of the blue phase liquid crystal layer. The arrangement shape thereof is a rectangle, a "horizontal and vertical" structure or a "zigzag" structure in a top view.

The horizontal and vertical structure is specifically as follows: the entire pixel is divided into upper and lower parts, and the first Pixel electrode and the second Pixel electrode in the lower half are arranged in a horizontal comb-tooth shape, and the direction is opposite, and they are arranged in a staggered manner. Among them, the first Pixel electrodes and the second Pixel electrodes are arranged in the shape of vertical comb teeth, and the directions are opposite, and they are arranged in a staggered manner.

The size of the first common electrode and the second common electrode is the size of the entire liquid crystal display screen.

The first protective layer and the second protective layer are insulating materials commonly used in thin film transistor liquid crystal displays, such as silicon dioxide, silicon nitride or polyimide (PI), with a thickness ranging from 0.08 to 1 μm.

The thickness range of the blue phase liquid crystal layer is 3-20 μm.

The upper polarizer and the lower polarizer are polarizers used in thin film transistors, the specific model is G1220DU, and the thickness is 230 μm;

The specific parameters of the λ/2 biaxial film are Nx=1.511, Ny=1.5095, Nz=1.51025, and the thickness is 184 μm;

The specific parameters of the upper λ/2 negative A wave plate are Nx=1.55, Ny=1.56, and the thickness is 27.5 μm;

The specific parameters of the upper λ/4 positive A wave plate are Nx=1.56, Ny=1.55, and the thickness is 13.5 μm;

The specific parameters of the lower λ/4 negative A wave plate are Nx=1.55, Ny=1.56, and the thickness is 13.5 μm;

The specific parameters of the lower λ/2 positive A wave plate are Nx=1.56, Ny=1.55, and the thickness is 27.5 μm;

The transmission axis direction of the lower polarizer is 0°, the optical axis direction of the lower λ/2 positive A wave plate is 75°, the optical axis direction of the lower λ/4 negative A wave plate is -75°, and the upper λ/4 positive The direction of the optical axis of the A wave plate is -75°, the direction of the optical axis of the upper λ/2 negative A wave plate is 75°, the direction of the upper λ/2 biaxial film is 0°, and the direction of the transmission axis of the upper polarizer 1 is 90°. All of the above angles are rotated at any angle at the same time, and the resulting display viewing angle characteristics have the same rotation angle with the rotation angle.

The connection schemes not involved in the above are all up-down relationships.

The content not mentioned above is public knowledge.

Compared with the prior art, the beneficial effect of the present invention is: on the basis of the FIS display mode, by adding an electrode on the lower surface of the upper glass substrate, the purpose of continuously controllable viewing angle is realized, and the introduction of the protrusions effectively The driving voltage is reduced, and the continuous control of the viewing angle is realized by adjusting the voltage relationship between the first common electrode and the second common electrode. More effectively, the technical solution proposed by the present invention solves the problem of low contrast in the narrow viewing angle mode. Through this technical solution, the driving voltage of the blue-phase liquid crystal display can be lower than 15V, or even lower than 10V, and the display in the wide viewing angle mode The characteristics are the same as those of traditional blue-phase liquid crystal displays. In the narrow viewing angle mode, the characteristics of high contrast and low driving voltage are realized, and a single gamma curve is realized to drive different viewing angles.

Other aspects and features of the present invention will become apparent from the following detailed description with reference to the accompanying drawings. It should be understood, however, that the drawing is designed for purposes of illustration only, and not as a setting of the scope of the invention, since it is given by reference.

Description of drawings

Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in detail, wherein:

Figure 1 is a cross-sectional view of the structure of Embodiment 1, Figure 1 (a) is a cross-sectional view of a traditional FIS-driven blue-phase liquid crystal display, and Figure 1 (b) is a blue-phase liquid crystal display with low driving voltage and continuous controllable viewing angle proposed in this embodiment section view of

Fig. 2 is the voltage-transmittance curve in the front view direction of the conventional blue-phase liquid crystal display and the blue-phase liquid crystal display with continuously controllable viewing angle proposed in embodiment 1;

Fig. 3(a) is a viewing angle diagram of a traditional blue-phase liquid crystal display, and Fig. 3(b) is a viewing angle diagram of a blue-phase liquid crystal display with a continuous controllable viewing angle proposed in embodiment 1 under the condition of a wide viewing angle;

Figure 4 is a diagram of the continuous change of the viewing angle in the narrow viewing angle mode of Example 1, and Figure 4 (a) is a viewing angle diagram when a voltage of 10V is applied to the first Common electrode and a voltage of -6V is applied to the second Common electrode; Figure 4 ( b) The picture shows the perspective view when 12V is applied to the first Common electrode and -7.2V is applied to the second Common electrode; Figure 4(c) shows 14V is applied to the first Common electrode and -7.2V is applied to the second Common electrode. Angle view at 8.4V voltage;

Fig. 5 is the electro-optical curve diagram under the different viewing angles of embodiment 1;

Fig. 6 is the electrode structure figure of embodiment 2;

Fig. 7 is the wide viewing angle diagram of embodiment 2;

Figure 8 is a diagram of the continuous change of the viewing angle in the narrow viewing angle mode of Example 2, and Figure 8 (a) is a viewing angle diagram when a voltage of 10V is applied to the first Common electrode and a voltage of -6V is applied to the second Common electrode; Figure 8 ( b) The picture shows the perspective view when 12V is applied to the first Common electrode and -7.2V is applied to the second Common electrode; Figure 8(c) shows 14V is applied to the first Common electrode and -7.2V is applied to the second Common electrode. Angle view at 8.4V voltage;

Fig. 9 is the electro-optical curve diagram under the different viewing angles of embodiment 2

Fig. 10 is the electrode structure figure of embodiment 3;

Fig. 11 is the wide viewing angle view of embodiment 3;

Figure 12 is a diagram of the continuous change of the viewing angle in the narrow viewing angle mode of Example 3, and Figure 12 (a) is a viewing angle diagram when a voltage of 10V is applied to the first Common electrode and a voltage of -6V is applied to the second Common electrode; Figure 12( b) The picture shows the perspective view when 12V is applied to the first Common electrode and -7.2V is applied to the second Common electrode; Figure 12(c) shows 14V is applied to the first Common electrode and -7.2V is applied to the second Common electrode. Angle view at 8.4V voltage;

FIG. 13 is an electro-optical curve diagram of Example 3 under different viewing angles.

Detailed ways

The implementation of the present invention will be further described below in conjunction with the accompanying drawings: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures have been provided, but the scope of the present invention is not limited to the subordinate embodiments .

Example 1

As shown in Figure 1(a), it is a traditional FIS-driven blue-phase liquid crystal display structure, which includes from top to bottom: upper polarizer 1, upper λ/2 biaxial film 2, upper λ/2 negative A wave plate 3 , upper λ/4 positive A wave plate 4, upper glass substrate 5, first protective layer 17, blue phase liquid crystal 7, second protective layer 18, first Pixel electrode 8 and second Pixel electrode 9, transparent raised layer 10 , Common electrode 11, lower glass substrate 12, lower λ/4 negative A wave plate 13, lower λ/2 positive A wave plate 14, and lower polarizer 15.

As shown in Figure 1(b), it is the structure of the blue-phase liquid crystal display of this embodiment, which includes from top to bottom: an upper polarizer 1, an upper λ/2 biaxial film 2, and an upper λ/2 negative A wave plate 3 , upper λ/4 positive A wave plate 4, upper glass substrate 5, first Common electrode 6, first protective layer 17, blue phase liquid crystal 7, second protective layer 18, Pixel electrode layer, transparent raised layer 10, the first Two Common electrodes 11, a lower glass substrate 12, a lower λ/4 negative A wave plate 13, a lower λ/2 positive A wave plate 14, and a lower polarizer 15; the Pixel electrode layer is the first parallel and spaced arrangement Pixel electrode 8 and second Pixel electrode 9 .

The first choice is that the direction of the transmission axis of the lower polarizer 15 is 0°, the direction of the optical axis of the lower λ/2 positive A wave plate 14 is 75°, the direction of the optical axis of the lower λ/4 negative A wave plate 13 is -75°, and the direction of the upper λ/4 The direction of the optical axis of the positive A wave plate 4 is -75°, the direction of the optical axis of the upper λ/2 negative A wave plate 3 is 75°, the direction of the upper λ/2 biaxial film 2 is 0°, and the direction of the transmission axis of the upper polarizer 1 is 90°.

The transparent protrusions 10 are silicon dioxide or organic materials commonly used in thin film transistor liquid crystal displays, and are strip-shaped, with a height of 3 μm, a length of pixel size, and a width of 2.4 μm. The transparent protrusions are arranged in parallel and at intervals with an interval of 4.6 μm. The arrangement shape is a rectangle in a top view.

Wherein, the first pixel electrode 8 and the second pixel electrode 9 are located on the transparent raised layer 10, arranged alternately in sequence, and respectively located above the transparent raised layer 10, and the width of the pixel electrode is the same as or slightly smaller than the width of the raised layer.

The thickness of all electrodes mentioned above is 0.1 μm; all electrodes are transparent indium tin oxide (ITO) electrodes commonly used in thin film transistor liquid crystal displays.

The width of the first Pixel electrode 8 and the second Pixel electrode 9 is 2 μm, the length is the pixel length, and their top view is rectangular.

The first Pixel electrode 8 and the second Pixel electrode 9 are located on the upper surface of the transparent bump layer 10 .

The material of the first protection layer 17 and the second protection layer 18 is PI, and the dielectric constant is 3.8. The thickness of the first PI layer is 0.1 μm, and the thickness of the second PI layer 18 is 0.1 μm.

The thickness of the blue phase liquid crystal layer is 8 μm.

The Cole constant of the blue phase liquid crystal is K=12.68nmV ^-2 , and the light wavelength λ=550nm.

The upper polarizer 1 and the lower polarizer 15 are polarizers used for thin film transistors, the specific model is G1220DU, and the thickness is 230 μm;

The specific parameters of the λ/2 biaxial film 2 are Nx=1.511, Ny=1.5095, Nz=1.51025, and the thickness is 184 μm;

The specific parameters of the upper λ/2 negative A wave plate are Nx=1.55, Ny=1.56, and the thickness is 27.5 μm;

The specific parameters of the upper λ/4 positive A wave plate are Nx=1.56, Ny=1.55, and the thickness is 13.5 μm;

The specific parameters of the lower λ/4 negative A wave plate are Nx=1.55, Ny=1.56, and the thickness is 13.5 μm;

The specific parameters of the lower λ/2 positive A wave plate are Nx=1.56, Ny=1.55, and the thickness is 27.5 μm;

The transmission axis direction of the lower polarizer is 0°, the optical axis direction of the lower λ/2 positive A wave plate is 75°, the optical axis direction of the lower λ/4 negative A wave plate is -75°, and the upper λ/4 positive A wave plate The direction of the optical axis is -75°, the direction of the optical axis of the upper λ/2 negative A wave plate is 75°, the direction of the upper λ/2 biaxial film is 0°, and the direction of the transmission axis of the upper polarizer 1 is 90°.

Fig. 2 shows the relationship diagram (electro-optic curve) between the transmittance and the voltage in the wide viewing angle mode and the front viewing direction of the viewing angle controllable blue-phase liquid crystal display proposed by the present invention and the traditional blue-phase liquid crystal display in the wide viewing angle mode. By comparison, the driving voltage of the traditional blue-phase liquid crystal FIS mode liquid crystal display is 40V, while the driving voltage of the viewing angle controllable blue-phase liquid crystal display proposed in this embodiment is 10.4V, which is 29.6V lower.

In this embodiment, in the wide viewing angle mode, the voltage on the first Common electrode 6 and the second Common electrode 11 is 0, and the voltage of opposite polarity is applied on the first Pixel electrode 8 and the second Pixel electrode 9 . Its viewing angle is shown in Figure 3(a). The viewing angle continuously controllable blue-phase liquid crystal display proposed by the present invention has almost the same viewing angle characteristics as the traditional blue-phase liquid crystal display in the case of wide viewing angle display, and the full viewing angle contrast ratio reaches more than 300. Figure 3(b) is the viewing angle diagram of the traditional blue-phase liquid crystal display in FIS mode, and the comparison shows that the low driving voltage viewing angle controllable blue-phase liquid crystal display proposed in this embodiment is almost indistinguishable from the traditional blue-phase liquid crystal display at a wide viewing angle. The highest contrast ratio is over 1000, and the lowest contrast ratio is over 100, both of which can realize color display very well.

In the narrow viewing angle display mode, a continuous voltage with opposite polarity and a certain ratio change is applied to the first Common electrode 6 and the second Common electrode 11, and then a voltage with opposite polarity is applied to the first Pixel electrode 8 and the second Pixel electrode 9. The voltage, its viewing angle is shown in Figure 4, (a) is 10V voltage applied to the first Common electrode, and -6V voltage applied to the second Common electrode (the ratio of absolute value is the thickness of the liquid crystal layer above the bulge to the height of the transparent bulge layer ), at this bias voltage, areas with a contrast greater than 10 are in the 40° range, and in the 20° range, the contrast is greater than 100. (b) A voltage of 12V is applied to the first Common electrode, and a voltage of -7.2V is applied to the second Common electrode (the ratio of the absolute value is the height of the transparent raised layer to the thickness of the liquid crystal layer). Under this bias voltage, the contrast ratio is greater than 10 The area in the 35° range, and the contrast ratio greater than 100 in the 15° range. (c) The picture shows that a voltage of 14V is applied to the first Common electrode, and a voltage of -8.4V is applied to the second Common electrode (the ratio of the absolute value is that the thickness of the liquid crystal layer above the protrusion is greater than the height of the transparent protrusion layer). Under this bias voltage , the area where the contrast ratio is greater than 10 is reduced to within 30°, while in the central range, the contrast ratio is still greater than 100, and can even reach more than 500, which can well realize color display. The problem of insufficient contrast in narrow viewing angles of traditional viewing angle controllable blue-phase liquid crystal displays is improved.

Fig. 5 is a curve diagram of the relationship between the transmittance and the voltage of this embodiment under different bias voltages. Compared with the voltage transmittance curves under different bias voltages, the voltage transmittance curves do not change much, and single gamma can be realized. Horse curve drive.

To sum up, the effective benefits of this embodiment are: 1. The continuous control of the viewing angle of the blue-phase liquid crystal display is realized, and the contrast ratio of the front view reaches more than 500, which can realize color display well; 2. The driving of the blue-phase liquid crystal display is reduced. Voltage, the driving voltage is reduced by 29.5V; 3. Under different narrow viewing angle modes, the maximum difference between the driving voltage and the wide viewing angle mode is 1V, realizing single gamma curve driving under different viewing angles.

Example 2

Figure 6 shows the electrode structure of Embodiment 2. The entire pixel is divided into two parts, the purpose is to make the viewing angle more symmetrical and facilitate the connection of all pixel electrodes. The corresponding transparent raised layer located under the pixel electrodes also makes the same changes. .

The difference between this embodiment and Embodiment 1 is that the transparent protrusions 10 , the first Pixel electrodes 8 and the second Pixel electrodes 9 in this embodiment have a "horizontal and vertical" structure. That is to say, the overall shape of the transparent protrusion 10 covered with the first Pixel electrode 8 or the second Pixel electrode 9 on the second Common electrode 11 is viewed from above, and the entire pixel is divided into upper and lower parts. The first Pixel electrode and the second Pixel electrode are arranged in a horizontal comb-tooth shape with opposite directions and staggered arrangement. In the upper half, the first Pixel electrode and the second Pixel electrode are arranged in a vertical comb-tooth shape with opposite directions and staggered arranged. Its purpose is to make a multi-domain structure to make the viewing angle more uniform.

The parts not described in this embodiment are the same as those in Embodiment 1.

In this embodiment, in the wide viewing angle mode, the voltage applied to the Common electrode and the Pixel electrode is the same as that of Embodiment 1. The specific wide viewing angle diagram is shown in Figure 7. Basically, the full viewing angle range reaches more than 300, which is different from the traditional FIS mode blue phase LCD monitors are basically the same.

In the narrow viewing angle mode, a voltage of a certain proportion is applied to the first Common electrode and the second Common electrode respectively (the ratio of the absolute value is the thickness of the liquid crystal layer above the bulge to the height of the transparent bulge layer) to obtain a narrow viewing angle as shown in Figure 8 Show. (a), (b) and (c) are the narrow viewing angle diagrams obtained when voltages of 10V, 12V, and 14V are applied to the first Common electrode, and voltages of -6V, -7.2V, and -8.4V are applied to the second Common electrode. The narrow viewing angle obtained in this implementation can be changed under different bias voltages: the range where the contrast ratio is greater than 100 can be reduced to within 30° of the full viewing angle. More importantly, through the change in the electrode structure of this embodiment, the fabrication of the electrode is easier, and the multi-domain effect can be obtained, and the viewing angle is more symmetrical.

As shown in Figure 9, the electro-optical curves in different viewing angle modes are close, and the maximum difference is only 1V, which can realize single gamma curve driving in different viewing angle modes.

The effective benefits of this embodiment are: the continuous control of the viewing angle of the blue-phase liquid crystal display is realized, and the contrast ratio of the front view reaches more than 500, and compared with the embodiment 1, the viewing angle is more symmetrical; the driving voltage of the blue-phase liquid crystal display is reduced. Reduced by 31.9V; in different narrow viewing angle modes, the maximum difference between the driving voltage and the wide viewing angle mode is 1V, realizing single gamma curve driving under different viewing angles.

Example 3

Figure 10 is a diagram of the electrode structure of the full pixel in Example 3. The electrode structure is a "zigzag" structure, and the purpose is also to achieve symmetry of the viewing angle. Change.

The difference between this embodiment and Embodiment 1 is that the transparent protrusion 10 , the first Pixel electrode 8 and the second Pixel electrode 9 in this embodiment have a zigzag structure, and the included angle of the "zigzag" is 90°. The corresponding transparent protrusions are also changed into zigzag transparent protrusions. The included angle of the word "Zhi" is also 90°. The first Pixel electrode 8 and the second Pixel electrode 9 are located above the transparent protrusion.

The parts not described in this embodiment are the same as those in Embodiment 1.

In this embodiment, in the wide viewing angle mode, the voltage applied to the Common electrode and the Pixel electrode is the same as that of Embodiment 1. The specific wide viewing angle diagram is shown in Figure 11. Basically, the full viewing angle range reaches more than 300, which is different from the traditional FIS mode blue phase LCD monitors are basically the same.

In the narrow viewing angle mode, apply voltages of a certain proportion on the first Common electrode and the second Common electrode respectively (the ratio of the absolute value is the thickness of the liquid crystal layer above the bulge to the height of the transparent bulge layer) to obtain a narrow viewing angle as shown in Figure 12 Show. (a), (b) and (c) are the narrow viewing angle diagrams obtained when voltages of 10V, 12V, and 14V are applied to the first Common electrode, and voltages of -6V, -7.2V, and -8.4V are applied to the second Common electrode. Through the selection of different bias voltages, it can be controlled from the full viewing angle to the viewing angle within 30°. More importantly, while obtaining a narrow viewing angle, it does not affect the contrast at the front viewing angle, so that the contrast at the front viewing angle also reaches 100° More than 500, color display can be well realized, and the narrow viewing angle obtained in this embodiment is more smooth than that in Embodiment 1, and the unsmooth place can be changed according to the change of the electrode angle, and the desired perspective situation.

As shown in Figure 13, the electro-optical curves in different viewing angle modes are close, and the maximum difference is only 1V, which can realize single gamma curve driving in different viewing angle modes.

The effective benefits of this embodiment are: the continuous control of the viewing angle of the blue-phase liquid crystal display is realized, and the contrast ratio of the front view reaches more than 500, and compared with the embodiment 1, the viewing angle is more symmetrical; the driving voltage of the blue-phase liquid crystal display is reduced. Reduced by 32.2V; in different narrow viewing angle modes, the maximum difference between the driving voltage and the wide viewing angle mode is 1V, realizing single gamma curve driving under different viewing angles.

For the blue-phase liquid crystal display with continuously controllable viewing angle proposed by the present invention:

Under the wide viewing angle, the bias voltage applied to the common electrodes on the upper and lower substrates is 0V, and the change of the thickness of the liquid crystal layer has almost no effect on the blue-phase liquid crystal display, achieving almost the same viewing angle as the traditional blue-phase liquid crystal display. Ratio and contrast. Moreover, due to the addition of the bumps, the driving voltage is greatly reduced, making the driving voltage below 10V, which meets the requirements of the existing TFT driving technology.

Under a narrow viewing angle, the blue-phase liquid crystal display proposed by the present invention can realize displaying at a narrow viewing angle by applying voltages with different polarities and a certain ratio to the common electrodes on the upper and lower substrates. Moreover, in this mode, the contrast ratio can still reach more than 500 within the viewing angle range of 20°, which successfully solves the problem that the contrast ratio of the traditional viewing angle controllable blue-phase liquid crystal display is only low within the polar angle range of 20° under the narrow viewing angle. 10 to 30 disadvantages. Moreover, by applying different bias voltages to the Common electrode, a viewing angle with different display effects and a narrow viewing angle mode with continuously changing contrast can be obtained. The manufacturing process of this invention is relatively simple, and there is no need to increase the number of TFTs, no alignment requirements, and no need to add liquid crystal cells, etc., which can be realized through existing technologies.

In the blue-phase liquid crystal display proposed by the present invention, when different bias voltages are applied to the Common electrodes on the upper and lower substrates, the electro-optic curve (the relationship between voltage and transmittance) at the front viewing angle and the electro-optic curve under the condition of wide viewing angle display In contrast, the change is not large, so the single gamma curve driving can be realized, and the complexity and production cost of the driving circuit caused by the different electro-optic curves of the liquid crystal display in different display modes can be reduced.

Claims (10)

1. a low driving voltage, visual angle controlled blue phase liquid crystal display continuously, the composition that it is characterized by this display comprises from top to bottom successively: upper polaroid, upper λ/2 biaxial film, the negative A wave plate in upper λ/2, the positive A wave plate in upper λ/4, top glass substrate, a Common electrode, the first protective seam, blue phase liquid crystal layer, the second protective seam, Pixel electrode layer, transparent convexity layer, the 2nd Common electrode, lower glass substrate, the negative A wave plate in lower λ/4, the positive A wave plate in lower λ/2 and lower polaroid; Described Pixel electrode layer is a parallel and spaced Pixel electrode and the 2nd Pixel electrode.

2. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described a Common electrode, the 2nd Common electrode, a Pixel electrode or the 2nd Pixel electrode, be tft liquid crystal and show conventional transparent indium tin oxide (ITO) electrode; Its voltage is respectively: under wide field-of-view mode, the voltage on a Common electrode and the 2nd Common electrode is that the voltage on 0, the one Pixel electrode and the 2nd Pixel electrode is equal and polarity is contrary; Under narrow field-of-view mode, the one Common electrode and the 2nd Common electrode apply polarity on the contrary and the big or small voltage with ratio, the voltage of the one Pixel electrode and the 2nd Pixel electrode is identical with under wide field-of-view mode, and described all thickness of electrode are 0.01～0.5 μ m;

Under described narrow field-of-view mode, the voltage applying on the one Common electrode and the 2nd Common electrode is respectively: on a Common electrode, apply positivity voltage, on the 2nd Common electrode, apply negative voltage, described ratio is specially: on a Common electrode, executing the ratio of executing alive absolute value on alive absolute value and the 2nd Common electrode is the ratio of the numerical value of projection top thickness of liquid crystal layer and height of projection; Or, on the one Common electrode, apply negative voltage, absolute value and the 2nd Common electrode on apply positivity voltage, on a Common electrode, executing the ratio of executing alive absolute value on alive absolute value and the 2nd Common electrode is the ratio of the numerical value of projection top thickness of liquid crystal layer and height of projection; The size that a described Common electrode and the 2nd Common electrode size are whole LCD Panel.

3. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described transparent projection is the conventional transparent material silicon dioxide of film crystal light liquid crystal display or organism material.

4. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described transparent projection is list structure, wide is 1-15 μ m, length is length in pixels, be highly 0.3 to 15 μ m, spacing between adjacent transparent projection is 0.8 μ m-14.8 μ m, its width and highly can adjusting according to the thickness of the size of display pixel and blue phase liquid crystal layer, its spread geometry is rectangle, " anyhow " structure or "the" shape structure in the situation of overlooking.

5. low driving voltage as claimed in claim 4, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described structure anyhow specific as follows: whole pixel is divided into upper and lower two parts, in the latter half, a Pixel electrode, the 2nd Pixel electrode are all horizontal broach shape arrangement, and opposite direction, staggered, in the first half, a Pixel electrode and the 2nd Pixel electrode are all the arrangement of setting broach shape, and opposite direction, staggered.

6. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by the upper surface that a described Pixel electrode and the 2nd Pixel electrode are positioned at transparent projection, be spaced, its width, length and shape are with transparent projection.

7. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously; it is characterized by described the first protective seam and the second protective seam is the insulating material that Thin Film Transistor-LCD is conventional; for silicon dioxide, silicon nitride or polyimide (PI) material, thickness range is 0.08 to 1 μ m.

8. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, the thickness range that it is characterized by described blue phase liquid crystal layer is 3～20 μ m.

9. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described upper polaroid and lower polaroid is thin film transistor (TFT) polaroid used, and concrete model is G1220DU, and thickness is 230 μ m; Described λ/2 biaxial film design parameter is Nx=1.511, Ny=1.5095, and Nz=1.51025, thickness is 184 μ m;

Described upper λ/2 negative A wave plate design parameter is Nx=1.55, Ny=1.56, and thickness is 27.5 μ m;

The positive A wave plate design parameter in described upper λ/4 is Nx=1.56, Ny=1.55, and thickness is 13.5 μ m;

Described lower λ/4 negative A wave plate design parameter is Nx=1.55, Ny=1.56, and thickness is 13.5 μ m;

The positive A wave plate design parameter in described lower λ/2 is Nx=1.56, Ny=1.55, and thickness is 27.5 μ m.

10. low driving voltage as claimed in claim 1, visual angle controlled blue phase liquid crystal display continuously, it is characterized by described lower polaroid light transmission shaft direction is 0 °, the positive A wave plate optical axis direction in lower λ/2 is 75 °, lower λ/4 negative A wave plate optical axis direction is-75 °, the positive A wave plate optical axis direction in upper λ/4 is-75 °, upper λ/2 negative A wave plate optical axis direction is 75 °, and upper λ/2 biaxial film direction is 0 °, and upper polaroid 1 light transmission shaft direction is 90 °; Above-mentioned all angles are rotated arbitrarily angled simultaneously, and gained display view angle characteristic has the identical anglec of rotation with the anglec of rotation.

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