CN103792743A - Blue phase liquid crystal display with low drive voltage and continuously-controllable visual angle - Google Patents
Blue phase liquid crystal display with low drive voltage and continuously-controllable visual angle Download PDFInfo
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- CN103792743A CN103792743A CN201410057128.1A CN201410057128A CN103792743A CN 103792743 A CN103792743 A CN 103792743A CN 201410057128 A CN201410057128 A CN 201410057128A CN 103792743 A CN103792743 A CN 103792743A
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Abstract
The invention discloses a blue phase liquid crystal display with a low drive voltage and a continuously-controllable visual angle. The display is composed of an upper polaroid, an upper lambda/2 biaxial membrane, an upper lambda/2 negative wave plate A, an upper lambda/4 positive wave plate A, an upper glass substrate, a first Common electrode, a first protection layer, a blue phase liquid crystal layer, a second protection layer, a Pixel electrode layer, a transparent protrusion layer, a second Common electrode, a lower glass substrate, a lower lambda/4 negative wave plate, a lower lambda/2 positive wave plate A and a lower polaroid. The Pixel electrode layer comprises a first Pixel electrode 8 and a second Pixel electrode 9, wherein the first Pixel electrode 8 and the second Pixel electrode 9 are parallel to each other and are arranged at an interval. The blue phase liquid crystal display effectively reduces the drive voltage, and achieves continuous control over the visual angle by adjusting the voltage relation of the first Common electrode and the second Common electrode, and the drive voltage of the blue phase liquid crystal display is below 15 V and even below 10 V.
Description
Technical field
What the present invention designed is a kind of device of technical field of liquid crystal display, specifically a kind of low driving voltage, visual angle controlled blue phase liquid crystal display device continuously
Background technology
Information protection is more and more subject to people's attention, and people need oneself portable set as mobile phone, and panel computer etc. have function that a visual angle can control so that protect in public the important informations such as individual privacy.
In recent years, blue phase liquid crystal display development rapidly, it is found that the advantage of a lot of blue phase liquid crystal displays.Simple such as making, do not need oriented layer, corresponding speed is fast, wide contrast height in visual angle etc.Producing blue phase liquid crystal display is the target that people make great efforts now.
Utilize a simple biaxial film, blue phase liquid crystal display is just easy to realize wide visual angle and shows.Full visual angle contrast can reach more than 300, can well realize colored demonstration.But for realizing wide visual angle when, utilize simple biaxial film to realize narrow visual angle also more difficult.Exist at present several method to realize the variation at the width visual angle of blue phase liquid crystal display.Such as the method for pixel separation method, double-deck liquid crystal cell or three layers of liquid crystal cell, utilize the variation of temperature to realize viewing angle control etc.But these methods all exist a lot of problems, such as 1, light utilization efficiency is low, sub-pixel method is divided into two parts a pixel, and a part is used for showing main information, and a pixel is used for controlling visual angle, so cause its aperture opening ratio low, light utilization efficiency directly reduces.2, cost is high, utilizes double-deck liquid crystal, or two box liquid crystal, has significantly increased a liquid crystal cell, directly raises the cost.3, also there is following general character defect in above several method: can not realize the stepless control at visual angle, under narrow field-of-view mode, can only have a kind of situation, for example, apply a certain definite voltage, or a certain temperature, can not accomplish that visual angle leniently arrives narrow continuous variation; Under narrow visual angle, contrast is low, conventionally before, method is under narrow field-of-view mode, center contrast is very low, generally only have 100 left and right, even, less than 100, can not well realize colored demonstration, and owing to having added the control at visual angle, even can have influence on the visual angle under wide field-of-view mode, wide visual angle can not normally be shown; Also can have for blue phase liquid crystal display the problem that driving voltage is high, can there is the problem that driving voltage is high in the equipment of common blue phase liquid crystal display, and above method can only obtain the variation at Dao Zhai visual angle, wide visual angle, can not reduce its driving voltage.
Summary of the invention
The object of the invention is to overcome the shortcoming existing in prior art, proposed a kind ofly increases bulge-structure on the basis of FIS pattern blue phase liquid crystal display, and on upper substrate, increase a bias electrode, the setting of bulge-structure, reduction clearly the driving voltage of blue phase liquid crystal display, the driving voltage of blue phase liquid crystal display is reduced to below 10V, can be accepted by existing TFT.On public (Common) of the upper and lower substrate of bias electrode electrode, apply bias voltage, obtain narrow field-of-view mode, but due to the introducing of bulge-structure, the bias voltage that we apply, with protruding height, the thickness of blue phase liquid crystal layer has certain relation: the bias voltage on upper substrate bias electrode is positivity voltage, bias voltage on infrabasal plate Common electrode is that (or bias voltage on upper substrate bias electrode is negative voltage to negative voltage, infrabasal plate Common electrode upper offset voltage is positivity voltage), and the ratio of upper and lower base plate upper offset absolute value of voltage be above bulge-structure thickness of liquid crystal layer than the height of bulge-structure.By above bias electrode, bulge-structure and the introducing of relation of the polarity of voltage that applies and ratio, realize low driving voltage, visual angle stepless control, single gamma driving curve blue phase liquid crystal display.The invention solves the controlled blue phase liquid crystal display complex process in traditional visual angle, cost is higher, and under narrow visual angle, contrast is low, and driving voltage is high, the problem such as under wide visual angle, under driving curve and narrow visual angle driving curve is inconsistent.
Technical scheme of the present invention is:
A kind of low driving voltage, visual angle controlled blue phase liquid crystal display continuously, its composition is followed successively by from top to bottom: 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 (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 8 and the 2nd Pixel electrode 9.
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, a Common electrode and the 2nd Common electrode apply polarity on the contrary and the big or small voltage with ratio, and the voltage of a Pixel electrode and the 2nd Pixel electrode is identical with under wide field-of-view mode.
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.
Described all thickness of electrode are 0.01～0.5 μ m.
Described transparent projection is the conventional transparent material silicon dioxide of film crystal light liquid crystal display or organism material; A described Pixel electrode and the 2nd Pixel electrode are positioned at the upper surface of transparent projection, are spaced, and its width, length and shape are with transparent projection;
Described transparent projection is list structure, and wide is 1-15 μ m, and length is length in pixels, is highly 0.3 to 15 μ m, and the 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.
Described structure is 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.
The size that a described Common electrode and the 2nd Common electrode size are whole LCD Panel.
The first described protective seam and the second protective seam are the insulating material that Thin Film Transistor-LCD is conventional, are silicon dioxide, silicon nitride or polyimide (PI) material, and thickness range is 0.08 to 1 μ m.
The thickness range of described blue phase liquid crystal layer is 3～20 μ m.
Described upper polaroid and lower polaroid are 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;
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 °, 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.
The above-mentioned upper and lower relation that is that does not relate to connection scheme.
The above-mentioned content that do not relate to is known content.
Be compared with the prior art, the invention has the beneficial effects as follows: on the basis of FIS display mode, by add an electrode at the lower surface of top glass substrate, realize visual angle controlled object continuously, and the introducing of projection, effectively reduce driving voltage, by regulating the voltage relationship of a common electrode and the 2nd common electrode, realized the stepless control at visual angle.More efficientlyly be, the technical scheme that the present invention proposes has solved the low problem of contrast under narrow field-of-view mode, pass through the technical program, the driving voltage of blue phase liquid crystal display has been realized below 15V, even below 10V, display characteristic under wide field-of-view mode and traditional blue phase liquid crystal display are as broad as long, have realized the high and low characteristic of driving voltage of contrast under narrow field-of-view mode, and have realized single gamma curve and drive different visual angles.
By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But should be understood that this accompanying drawing is only used to the object design of explaining, rather than as the setting of the scope that the present invention relates to, this is to provide as a reference because of it.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, wherein:
Fig. 1 is the section of structure of embodiment 1, and Fig. 1 (a) traditional F IS drives the sectional view of blue phase liquid crystal display, the low driving voltage that Fig. 1 (b) proposes for the present embodiment, the sectional view of the continuous controlled blue phase liquid crystal display in visual angle;
Fig. 2 is the voltage-transmittance curve of the positive apparent direction of the continuous controlled blue phase liquid crystal display in visual angle that proposes of traditional blue phase liquid crystal display and embodiment 1;
The visual angle figure that Fig. 3 (a) is traditional blue phase liquid crystal display, the visual angle figure in the wide visual angle situation of the continuous controlled blue phase liquid crystal display in visual angle that Fig. 3 (b) proposes for embodiment 1;
Fig. 4 is the continuous variation diagram in visual angle under the narrow field-of-view mode of embodiment 1, and Fig. 4 (a) figure applies 10V voltage on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-6V voltage; Fig. 4 (b) figure applies 12V on the one Common electrode, and on the 2nd Common electrode when apply-7.2V voltage is visual angle figure; Fig. 4 (c) figure applies 14V on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-8.4V voltage;
Fig. 5 is the electro-optical curve figure under the different visual angles of embodiment 1;
Fig. 6 is the electrode structural chart of embodiment 2;
Fig. 7 is the wide visual angle figure of embodiment 2;
Fig. 8 is the continuous variation diagram in visual angle under the narrow field-of-view mode of embodiment 2, and Fig. 8 (a) figure applies 10V voltage on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-6V voltage; Fig. 8 (b) figure applies 12V on the one Common electrode, and on the 2nd Common electrode when apply-7.2V voltage is visual angle figure; Fig. 8 (c) figure applies 14V on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-8.4V voltage;
Fig. 9 is the electro-optical curve figure under the different visual angles of embodiment 2
Figure 10 is the electrode structural chart of embodiment 3;
Figure 11 is the wide visual angle figure of embodiment 3;
Figure 12 is the continuous variation diagram in visual angle under the narrow field-of-view mode of embodiment 3, and Figure 12 (a) figure applies 10V voltage on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-6V voltage; Figure 12 (b) figure applies 12V on the one Common electrode, and on the 2nd Common electrode when apply-7.2V voltage is visual angle figure; Figure 12 (c) figure applies 14V on the one Common electrode, the visual angle figure on the 2nd Common electrode when apply-8.4V voltage;
Figure 13 is the electro-optical curve figure under the different visual angles of embodiment 3.
Embodiment
Below in conjunction with accompanying drawing, enforcement of the present invention is further described: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but scope of the present invention is not limited to subordinate's embodiment.
Embodiment 1
As shown in Fig. 1 (a); for the blue phase liquid crystal display structure of traditional F IS driving; comprise successively from top to bottom: upper polaroid 1, upper λ/2 biaxial film 2, the negative A wave plate 3 in upper λ/2, the positive A wave plate 4 in upper λ/4, top glass substrate 5, the first protective seam 17, blue phase liquid crystal 7, the second protective seam 18, a Pixel electrode 8 and the 2nd Pixel electrode 9; transparent convexity layer 10; Common electrode 11, lower glass substrate 12, the negative A wave plate 13 in lower λ/4, the positive A wave plate 14 in lower λ/2 and lower polaroid 15.
As shown in Fig. 1 (b), for the blue phase liquid crystal display structure of the present embodiment, comprise successively from top to bottom: upper polaroid 1, upper λ/2 biaxial film 2, the negative A wave plate 3 in upper λ/2, the positive A wave plate 4 in upper λ/4, top glass substrate 5, a Common electrode 6, the first protective seam 17, blue phase liquid crystal 7, the second protective seam 18, Pixel electrode layer, transparent convexity layer 10, the 2nd Common electrode 11, lower glass substrate 12, the negative A wave plate 13 in lower λ/4, the positive A wave plate 14 in lower λ/2 and lower polaroid 15; Described Pixel electrode layer is a parallel and spaced Pixel electrode 8 and the 2nd Pixel electrode 9.
First-selected lower polaroid 15 light transmission shaft directions are 0 °, positive A wave plate 14 optical axis directions in lower λ/2 are 75 °, negative A wave plate 13 optical axis directions in lower λ/4 are-75 °, positive A wave plate 4 optical axis directions in upper λ/4 are-75 °, negative A wave plate 3 optical axis directions in upper λ/2 are 75 °, upper λ/2 biaxial film 2 directions are 0 °, and upper polaroid 1 light transmission shaft direction is 90 °.
Described transparent protruding 10 is Thin Film Transistor-LCD common used material silicon dioxide or organism material, is strip structure, is highly 3 μ m, and length is pixel size, and width is 2.4 μ m.Between transparent projection, parallel interval is arranged, interval 4.6 μ m.Spread geometry is rectangle in the situation of overlooking.
Wherein, a Pixel electrode 8 and the 2nd Pixel electrode 9 are positioned at above transparent convexity layer 10, alternative arrangement successively, and lay respectively at the top of transparent convexity layer 10, Pixel electrode width is identical or smaller with protruding width.
Described all thickness of electrode are 0.1 μ m; All electrodes are the transparent indium tin oxide that Thin Film Transistor-LCD is conventional (ITO) electrode.
A described Pixel electrode 8 and the width of the 2nd Pixel electrode 9 are 2 μ m, and length is length in pixels, and its vertical view is rectangle.
A described Pixel electrode 8 and the 2nd Pixel electrode 9 are positioned at the upper surface of transparent convexity layer 10.
Described the first protective seam 17, the second protective seam 18 materials are PI, and specific inductive capacity is 3.8.The one PI layer thickness is 0.1 μ m, and the 2nd PI layer 18 thickness are 0.1 μ m.
The thickness of described blue phase liquid crystal layer is 8 μ m.
Cole constant K=the 12.68nmV of described blue phase liquid crystal
-2, light wavelength lambda=550nm.
Described upper polaroid 1 and lower polaroid 15 are thin film transistor (TFT) polaroid used, and concrete model is G1220DU, and thickness is 230 μ m;
Described λ/2 biaxial film 2 design parameters are 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;
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 °, upper λ/2 biaxial film direction is 0 °, and upper polaroid 1 light transmission shaft direction is 90 °.
Fig. 2 has provided the controlled blue phase liquid crystal display in visual angle that the present invention under wide field-of-view mode proposes and traditional blue phase liquid crystal display at wide field-of-view mode, the just transmitance of apparent direction and the graph of a relation of voltage (electro-optical curve).Contrast obtains, and the driving voltage of traditional blue phase liquid crystal FIS mode LCD is 40V, and the driving voltage of the controlled blue phase liquid crystal display in visual angle that the present embodiment proposes is 10.4V, has reduced 29.6V.
In the present embodiment, under wide field-of-view mode, on a Common electrode 6 and the 2nd Common electrode 11, voltage is to apply opposite polarity voltage on 0, the one Pixel electrode 8 and the 2nd Pixel electrode 9.Its visual angle is as shown in Fig. 3 (a), and the continuous controlled blue phase liquid crystal display in visual angle and the viewing angle characteristic of traditional blue phase liquid crystal display in wide visual angle demonstration situation that the present invention proposes are almost identical, and full visual angle contrast all reaches more than 300.Fig. 3 (b) is the visual angle figure of traditional F IS pattern blue phase liquid crystal display, contrast obtains: the controlled blue phase liquid crystal display in low driving voltage visual angle that the present embodiment proposes is almost as broad as long with traditional blue phase liquid crystal display under wide visual angle, high-contrast reaches more than 1000, minimum contrast more than 100, all can well realize colored demonstration.
Under the display mode of narrow visual angle, on a Common electrode 6 and the 2nd Common electrode 11, apply the continuous voltage that polarity is contrary and certain proportion changes, then on a Pixel electrode 8 and the 2nd Pixel electrode 9, apply opposite polarity voltage, its visual angle as shown in Figure 4, (a) be to apply 10V voltage on a Common electrode, apply-6V voltage on the 2nd Common electrode (ratio of absolute value is for projection top thickness of liquid crystal layer is than transparent convexity layer height), under this bias voltage, contrast is greater than 10 region within the scope of 40 °, and within the scope of 20 °, contrast is greater than 100.(b) be to apply 12V voltage on a Common electrode, apply-7.2V voltage on the 2nd Common electrode (ratio of absolute value is transparent convexity layer aspect ratio thickness of liquid crystal layer), under this bias voltage, contrast is greater than 10 region within the scope of 35 °, and within the scope of 15 °, contrast is greater than 100.(c) figure applies 14V voltage on the one Common electrode, apply-8.4V voltage on the 2nd Common electrode (ratio of absolute value is for projection top thickness of liquid crystal layer is than transparent convexity layer height), under this bias voltage, contrast is greater than 10 region and narrows down within the scope of 30 °, and in center range, contrast is still greater than 100, even can reach more than 500, can well realize colored demonstration.Improve the problem of the controlled blue phase liquid crystal display in traditional visual angle contrast deficiency under narrow visual angle.
Fig. 5 is the transmitance of the present embodiment under different bias voltages and the graph of relation of voltage, contrasts the voltage transmittance curve under different bias voltages, and its voltage transmittance curve changes little, can realize single gamma curve and drive.
To sum up, effective income of the present embodiment is: 1, and realize the visual angle stepless control of blue phase liquid crystal display, and faced contrast and reached more than 500, can well realize colored demonstration; 2, reduce the driving voltage of blue phase liquid crystal display, driving voltage has reduced 29.5V; 3, under different narrow field-of-view modes, maximum disparity 1V under driving voltage and wide field-of-view mode, realized different visual angles place an order gamma curve drive.
Fig. 6 is the electrode structure of embodiment 2, and whole pixel is divided into two parts, and object is to make visual angle more symmetrical, facilitates the connection of all pixel electrodes, and the transparent convexity layer that is positioned at accordingly pixel electrode below is also made identical change.
The present embodiment difference from Example 1 is that transparent protruding 10, the Pixel electrode 8 of the present embodiment and the 2nd Pixel electrode 9 are " anyhow " structure.Described transparent protruding 10 global shapes on the 2nd Common electrode 11 that are coated with a Pixel electrode 8 or the 2nd Pixel electrode 9 overlook into, 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.Its object is to make multidomain structure, makes visual angle homogenising more.
The present embodiment is not described part, all identical with embodiment 1.
In the present embodiment, under wide field-of-view mode, execute alive mode identical with embodiment 1 on Common electrode and Pixel electrode, concrete wide visual angle figure figure is as shown in 7, substantially full angular field of view has reached more than 300, basic identical with traditional FIS pattern blue phase liquid crystal display.
Under narrow field-of-view mode, on a Common electrode and on the 2nd Common electrode, apply respectively narrow visual angle that the voltage (ratio of absolute value is for projection top thickness of liquid crystal layer is than transparent convexity layer height) of certain proportion size obtains as shown in Figure 8.(a) (b) (c) is respectively and on a Common electrode, applies 10V, 12V, 14V voltage, the narrow visual angle figure obtaining when apply-6V ,-7.2V ,-8.4V voltage on the 2nd Common electrode.The narrow visual angle that this enforcement obtains can change under different bias voltages: contrast is greater than 100 scope and can be reduced in 30 °, full visual angle.What is more important, by the variation on the electrode structure of the present embodiment, is easier to the making of electrode, and can obtains multidomain effect, and visual angle is more symmetrical.
As shown in Figure 9, the electro-optical curve under different visual angles pattern approaches, and maximum disparity only has 1V, and the single gamma curve that can realize under different visual angles pattern drives.
Effective income of the present embodiment is: realized the visual angle stepless control of blue phase liquid crystal display, and faced contrast and reach more than 500, and compared with embodiment 1, visual angle is more symmetrical; Reduce the driving voltage of blue phase liquid crystal display.Reduce 31.9V; Under different narrow field-of-view modes, maximum disparity 1V under driving voltage and wide field-of-view mode, realized different visual angles place an order gamma curve drive.
Embodiment 3
Figure 10 is the electrode structural chart of the both full-pixel under embodiment 3, and electrode structure is "the" shape structure, and object is to realize the symmetrization at visual angle equally, corresponding, and the transparent convexity layer that is positioned at electrode below also will be made corresponding change.
The present embodiment difference from Example 1 is that transparent protruding 10, the Pixel electrode 8 of the present embodiment and the 2nd Pixel electrode 9 are " it " word structure, and the angle of " it " word is 90 °.Corresponding transparent projection also makes a change, and is the transparent projection of "the" shape.The angle of " it " word is similarly 90 °.The one Pixel electrode 8 and the 2nd Pixel electrode 9 are positioned at the top of transparent projection.
The present embodiment is not described part, all identical with embodiment 1.
In the present embodiment, under wide field-of-view mode, execute alive mode identical with embodiment 1 on Common electrode and Pixel electrode, concrete wide visual angle figure as shown in figure 11, substantially full angular field of view has reached more than 300, basic identical with traditional FIS pattern blue phase liquid crystal display.
Under narrow field-of-view mode, on a Common electrode and on the 2nd Common electrode, apply respectively narrow visual angle that the voltage (ratio of absolute value is for projection top thickness of liquid crystal layer is than transparent convexity layer height) of certain proportion size obtains as shown in figure 12.(a) (b) (c) is respectively and on a Common electrode, applies 10V, 12V, 14V voltage, the narrow visual angle figure obtaining when apply-6V ,-7.2V ,-8.4V voltage on the 2nd Common electrode.By the selection of different bias voltages, can obtain from full visual angle to viewing angle control in 30 °, what is more important, when obtaining narrow visual angle, do not affect the contrast under positive angle, contrast under positive angle is reached more than 500 equally, can be good at realizing colored demonstration, and the narrow visual angle that the present embodiment obtains is compared with embodiment 1, more round and smooth, not round and smooth place can be according to the variation of electrode angle, and changes, the visual angle situation that can obtain wanting.
As shown in figure 13, the electro-optical curve under different visual angles pattern approaches, and maximum disparity only has 1V, and the single gamma curve that can realize under different visual angles pattern drives.
Effective income of the present embodiment is: realized the visual angle stepless control of blue phase liquid crystal display, and faced contrast and reach more than 500, and compared with embodiment 1, visual angle is more symmetrical; Reduce the driving voltage of blue phase liquid crystal display.Reduce 32.2V; Under different narrow field-of-view modes, maximum disparity 1V under driving voltage and wide field-of-view mode, realized different visual angles place an order gamma curve drive.
The visual angle proposing for the present invention is controlled blue phase liquid crystal display continuously:
Under wide visual angle, the bias voltage applying on Common electrode on upper and lower base plate is all 0V, the variation of the thickness of liquid crystal layer almost without any impact, realizes visual angle, transmitance and the contrast almost identical with traditional blue phase liquid crystal display for blue phase liquid crystal display.And due to adding of projection, reduce to a great extent driving voltage, driving voltage has been reached below 10V, reached the requirement of existing TFT Driving technique.
Under narrow visual angle, by applying polarity difference on the Common electrode on upper and lower base plate, and a certain proportion of voltage, the blue phase liquid crystal display that can make the present invention propose is realized narrow visual angle and is shown.And under this pattern, 20 ° with in interior angular field of view, contrast still can reach more than 500, has successfully solved under the narrow visual angle of controlled blue phase liquid crystal display, traditional visual angle, and within the scope of the polar angle of 20 ° of underwears, contrast only has 10 to 30 shortcoming.And, on Common electrode, apply different bias voltages, can obtain visual angle and the narrow field-of-view mode of contrast continually varying that display effect is different.This invention manufacture craft is relatively simple, and not needing increases TFT number, there is no contraposition requirement, does not more need to increase liquid crystal cell etc., can realize by existing technology.
The blue phase liquid crystal display that the present invention proposes, on on the Common electrode on upper and lower base plate, apply different bias voltages, under positive angle, its electro-optical curve (voltage and transmitance relation curve) is compared with electro-optical curve in wide visual angle demonstration situation, change little, therefore can realize single gamma curve drives, reduce this liquid crystal display in different display modes situation, complexity and the cost of manufacture of the driving circuit causing due to the difference of electro-optical curve.
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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