CN101149494A - Method for implementing visual angle adjustability and its liquid crystal display device - Google Patents
Method for implementing visual angle adjustability and its liquid crystal display device Download PDFInfo
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Abstract
This invention discloses a sort of method which can realize the regulation of the visual angle and its liquid crystal display device. Based the switch technique of the borderline electric field the first base plate of the device has the plane public electrode and picture-point electrode which makes a picture-point electrode of the picture-point unit by the red, green, blue and the four sub picture-point electrode, at the same time there has the plane visual angle control electrode at the second base plate. When the control electrode is in the state of suspension, the liquid crystal is controlled by the borderline electric field, and it is switched in the plane which parallels to the base plate in order to control the back-light penetrant rate, at the same time it works in the wide-angle mode. When the four sub picture-point electrode is given the voltage which is the same with the public electrode, and the visual angle control electrode is given another voltage in order to form the vertical electric field. It makes the liquid crystal of the four picture-point area in the state of vertical, and it produces the side-glance light leakage, at the same time it works in the narrow angle mode. The penetrant rate of the liquid crystal display device of this invention is high, its realized manner is simple, and it contains to the conventional craftwork manufacturing process completely.
Description
Technical field
The present invention relates to adjustable method in a kind of liquid crystal indicator visual angle and the adjustable liquid crystal indicator in visual angle, relate in particular to a kind of based on the adjustable adjustable liquid crystal indicator of method and visual angle in the liquid crystal indicator visual angle of boundary electric field handoff technique.
Background technology
Along with the continuous progress of liquid crystal flat-panel display technique, liquid crystal display device just is applied to every field widely, such as mobile phone, desktop computer, televisor, notebook computer or the like.In general, the visible angle of liquid crystal display device always is the bigger the better, and for example people always wish that it is identical watching the effect of LCD TV from all angles.But in some specific application scenarios, the demand of protection individual privacy is arranged when using notebook computer in public such as the consumer, do not wish that the people around can watch the content on self display, need display can be operated under the narrow field-of-view mode this moment.Therefore, be necessary to develop a kind of display of adjustable viewing angle.
Figure 1A, 1B are the principle schematic of the view angle-adjustable LCD device spare of traditional approach one, and they work in respectively under wide viewing angle and the narrow field-of-view mode.General transmission type lcd device is made up of liquid crystal panel and backlight two parts, and liquid crystal panel is on top, and backlight is in the bottom.Provide uniform surface light source by backlight, and liquid crystal panel control display graphics.Structure shown in Figure 1 is by add the light scattering structure 120 of an adjustable lay the grain scattering properties between liquid crystal panel 130 and backlight 110, such as polymer dispersion type liquid crystal (polymer dispersed liquid crystal display, PDLC) device.Shown in Figure 1A, when being in the voltage turn-on state, light scattering structure 120 presents transparence, the light keeping parallelism of backlight is by 120 and liquid crystal panel 130, and only the observer on positive apparent direction just can see image clearly, makes display device work in narrow field-of-view mode.Shown in Figure 1B, when being in voltage, light scattering structure 120 is not scattering state during conducting state, the light that backlight sends becomes non-parallel light through behind the diffusing structure, and this moment, the observer of all directions can both see show image, made liquid crystal panel work in the wide viewing angle pattern.
The method of this adjustable viewing angle exists comparatively significant disadvantages.At first, because the light that sends of backlight is not complete directional light, even therefore under narrow field-of-view mode, the onlooker still can see the displaying contents of liquid crystal panel from the stravismus direction.Secondly, when light scattering device is in scattering state, bigger to the loss of brightness.In addition, increase one deck diffusing structure, must increase the thickness of Liquid Crystal Module, increased cost simultaneously again.
In Chinese invention patent 200610077487.9, the author has proposed a kind of novel view angle-adjustable LCD device spare at in-plane-switching mode (IPS), and particular content is referring to Fig. 2 A-2F.
Shown in Fig. 2 A, the pixel of this structure is made of 4 sub-pixel Pr, Pg, Pb and Pv, represents red, green, blue and control sub-pixel respectively.Wherein, Pr, Pg, Pb work in in-plane-switching mode (IPS), promptly control liquid crystal and rotate in face by apply voltage between IPS pixel electrode 217 and IPS public electrode 224, finally reach the purpose of control light transmission rate.And control sub-pixel Pv is different with other three sub-pixels, and its viewing angle control pixel electrode 237 and viewing angle control public electrode 234 are plane electrode, and lay respectively on the array base palte and color membrane substrates of liquid crystal both sides.When two electrodes did not apply voltage, the liquid crystal of control in the sub-pixel was parallel to substrate, and shown in Fig. 2 B, be shown as black attitude this moment, and saw from different perspectives and be black attitude.Because the red, green, blue sub-pixel works under the IPS pattern, has good viewing angle characteristic, makes the liquid crystal panel general performance go out the wide viewing angle characteristic, its viewing angle characteristic such as Fig. 2 C; When applying a voltage difference, make liquid crystal molecule be in vertical state, shown in Fig. 2 D at electrode 237 and 234 both sides, at this moment, see still be black attitude from positive visual angle, see from the side-looking angle to have produced light leak, the transmitance of Pv sub-pixel and the relation at visual angle such as Fig. 2 E are similar to the black attitude of TN pattern.The light leak of Pv sub-pixel makes that the liquid crystal panel general performance is narrow viewing angle characteristic, shown in Fig. 2 F.
The method of this adjustable viewing angle is controlled simply, but because 1/4 pixel is as the control pixel, does not participate in demonstration, so the brightness of display device will have big loss, contrast decline.
Summary of the invention
Technical matters to be solved by this invention is bigger at there being the luminance loss in the said method, shortcomings such as implementation complexity, it is a kind of based on boundary electric field handoff technique (fringe fieldswitching that this patent provides, FFS) the adjustable liquid crystal indicator of method and visual angle that realization liquid crystal indicator visual angle is adjustable has solved one or more shortcomings in the prior art.
As follows in order to solve the problems of the technologies described above the adjustable method in realization liquid crystal indicator of the present invention visual angle:
Described liquid crystal indicator is based on the boundary electric field handoff technique, comprise first substrate, second substrate and liquid crystal layer, first substrate is provided with plane public electrode and pixel electrode, constitute the pixel electrode of a pixel cell by red sub-pixel, green sub-pixels, blue subpixels electrode, second substrate is provided with the red, green, blue color filter, described method adds the 4th sub-pixel and constitutes a pixel cell by four sub-pixels, simultaneously on second substrate, plane electrode is set, i.e. the viewing angle control electrode corresponding to the 4th locations of pixels;
When the viewing angle control electrode is in suspended state (promptly not making alive), liquid crystal in four sub-pixels is all by the boundary electric field control that produces between pixel electrode and the public electrode, liquid crystal changes to control transmitance backlight at the in-plane that is parallel to substrate, at this moment, liquid crystal indicator is operated in the wide viewing angle pattern;
When the pixel electrode of the 4th sub-pixel adds the voltage identical with public electrode, on the viewing angle control electrode, add another voltage, so that form vertical electric field between public electrode and the control electrode, make the liquid crystal of the 4th pixel region be in vertical state, produce the side-looking light leak, angle of visibility narrows down, and at this moment, liquid crystal indicator is operated in narrow field-of-view mode.
Described the 4th pixel electrode can be the white pixel electrode.Four sub-pixels of described pixel cell can be matrix pattern arrangement or transversely arranged side by side.
For the adjustable liquid crystal indicator in visual angle of the present invention, above-mentioned technical matters is to solve like this:
Described liquid crystal indicator is based on the boundary electric field handoff technique, comprise first substrate, second substrate and liquid crystal layer, first substrate is provided with plane public electrode and pixel electrode, by red sub-pixel, green sub-pixels, the blue subpixels electrode constitutes the pixel electrode of a pixel cell, second substrate is provided with red, green, the blue color color filter, also include one the 4th pixel electrode in the above the pixel electrode of each pixel cell of first substrate, on second substrate, be provided with the plane electrode that plays the viewing angle control effect that links to each other with signal substrate by electrode wires with the corresponding position of the 4th pixel electrode.
Described the 4th pixel electrode can be the white pixel electrode.Four sub-pixels of described pixel cell can be matrix pattern arrangement or transversely arranged side by side.
As mentioned above, each pixel of the liquid crystal display device that this patent proposes is made up of four sub-pixels, and when the viewing angle control electrode was in suspended state (promptly not making alive), liquid crystal display device was operated in the wide viewing angle pattern.At this moment, all by the boundary electric field control that produces between pixel electrode and the public electrode, liquid crystal changes at the in-plane that is parallel to substrate the liquid crystal in four sub-pixels, reaches the purpose to transmitance control backlight, and this moment, four sub-pixels were all as show electrode.Owing to adopt the boundary electric field switch mode, liquid crystal display device has good viewing angle characteristic simultaneously.
Liquid crystal display device is in narrow visual angle mode of operation following time, and the pixel electrode of the 4th (white) sub-pixel is added the voltage identical with public electrode, adds another voltage on the viewing angle control electrode, so that form vertical electric field between public electrode and the control electrode.Voltage difference between public electrode and the control electrode must be enough big, makes liquid crystal can be in vertical state, and at this moment, from positive visual angle, the 4th (white) sub-pixel is shown as black attitude, and from the side-looking angle, the 4th (white) sub-pixel produces light leak.Because from positive visual angle, liquid crystal is in vertical state, liquid crystal cell does not produce phase delay, presents black attitude in the Polarizer effect of quadrature.Observe from the side-looking angle, liquid crystal is in heeling condition, has produced phase delay, light leak occurred under the cross-polarized light plate.Because the 4th (white) sub-pixel makes display viewing angles narrow down at the light leak at side-looking angle.
Add the structure of controlling sub-pixel with red, green, blue three sub-pixels in the patent 200610077487.9 and compare, under the wide viewing angle pattern, its transmitance maximum in theory can improve 100%; Compare with traditional red, green, blue three sub-pixels structures, under the wide viewing angle pattern, its transmitance maximum in theory can improve 50%.In addition, compare, can realize the visual angle adjustable function again with traditional red, green, blue, white four sub-pixels.And its implementation of liquid crystal display device that this patent proposes is simple, and is compatible fully with traditional liquid crystal display device manufacturing process.
Description of drawings
Fig. 1 is the principle schematic of the view angle-adjustable LCD device spare of traditional approach one; Wherein scheming A is narrow visual angle mode of operation; Figure B is the wide viewing angle mode of operation.
Fig. 2 is the principle schematic based on the view angle-adjustable LCD device spare of IPS technology of traditional approach two; Wherein scheme the structural drawing of A for this mode; Figure B is the n-n sectional view that is operated under the wide viewing angle pattern; Figure C is under the wide viewing angle pattern, the viewing angle characteristic of display; Figure D is the n-n sectional view under the mode of operation of narrow visual angle; Figure E is under the narrow field-of-view mode, and the transmitance of control sub-pixel is with the characteristic at visual angle; Figure F is under the narrow field-of-view mode, the viewing angle characteristic of display.
Fig. 3 is the dot structure synoptic diagram that the present invention is based on the adjustable liquid crystal indicator in visual angle of boundary electric field handoff technique.
Fig. 4 is the fundamental diagram of the adjustable liquid crystal indicator in visual angle of the present invention, and Fig. 4 A is the m-m sectional view under the wide viewing angle pattern; Fig. 4 B is the m-m sectional view under the narrow field-of-view mode.
Fig. 5 is two kinds of implementations of the adjustable liquid crystal indicator pixel arrangement in visual angle of the present invention, and Fig. 5 A is the array arrangement architecture; Fig. 5 B is the horizontal arrangement architecture.
Fig. 6 is the 4th (white) sub-pixel light leak synoptic diagram under narrow field-of-view mode.
Among the figure:
130 liquid crystal panels, 120 light scattering structures, 110 backlights
225IPS concentric line 224IPS public electrode 217IPS pixel electrode
234 viewing angle control public electrodes, 237 viewing angle control pixel electrodes, 301 controlling grid scan lines
302 signal scanning line 303 concentric lines, 304 thin film transistor (TFT)s (TFT)
305 contact holes, 306 plane public electrodes, 307 pixel electrodes
308 concentric lines and public electrode connecting portion 309 viewing angle control electrodes
401 first substrates (array base palte), 402 second substrates (color membrane substrates), 403 liquid crystal
404 black matrix 405 color filters
Pr red sub-pixel electrode Pg green sub-pixels electrode
Pb blue subpixels electrode Pw white sub-pixels electrode
Embodiment
The invention will be further described below in conjunction with drawings and the specific embodiments.
Fig. 3, Fig. 4 show the adjustable liquid crystal indicator in the visual angle based on the boundary electric field handoff technique of the present invention, comprise that first substrate (claim not only array base palte), 401, second substrate (but also claiming color membrane substrates) 402 and liquid crystal layer 403, the first substrates 401 are provided with mutual intersection and limit the controlling grid scan line 301 and the signal scanning line 302 of subpixel area; The thin film transistor (TFT) of controlling grid scan line and signal scanning line infall (thin filmtransistor, TFT) 304; The pixel electrode 307 that links to each other by contact hole 305 and TFT drain electrode; Concentric line 303 and the public electrode 306 that links to each other with concentric line 303 by contact portion 308; Constitute the pixel electrode 307 of a pixel cell by red sub-pixel electrode Pr, green sub-pixels electrode Pg, blue subpixels electrode Pb and white sub-pixels electrode Pw, correspondence is provided with red, green, blue color filter 405 on second substrate 402, and be provided with the viewing angle control electrode 309 that links to each other with signal substrate by electrode wires with the corresponding position of white sub-pixels electrode Pw on second substrate 402, this viewing angle control electrode 309 is a plane electrode.Be provided with black matrix 404 between the color filter 405 and between color filter film 405 and the viewing angle control electrode 309.
Fig. 4 A, 4B are respectively the sectional view under wide viewing angle, the narrow field-of-view mode.
When viewing angle control electrode 309 was in suspended state (promptly not making alive), liquid crystal indicator was operated in the wide viewing angle pattern.At this moment, the liquid crystal 403 in four sub-pixels is by the boundary electric field control that produces between pixel electrode 307 and the public electrode 306, and liquid crystal 403 changes at the in-plane that is parallel to substrate, reaches the purpose to transmitance control backlight, shown in Fig. 4 A.Because adopt the boundary electric field switch mode, liquid crystal display device has good viewing angle characteristic.
Liquid crystal display device is in narrow visual angle mode of operation following time, the pixel electrode Pw of white sub-pixels is added the voltage identical with public electrode 306, on viewing angle control electrode 309, add another voltage, so that form vertical electric field between public electrode 306 and the viewing angle control electrode 309.Voltage difference between public electrode 306 and the viewing angle control electrode 309 must be enough big, makes liquid crystal 403 can be in vertical state, as Fig. 4 B.At this moment, from positive visual angle, white sub-pixels is shown as black attitude, and from the side-looking angle, white sub-pixels produces light leak, and its light leak principle can be explained from Fig. 6.Because from positive visual angle, liquid crystal is in vertical state, liquid crystal cell does not produce phase delay, presents black attitude in the Polarizer of quadrature (indicating in the diagram) effect.Observe from the side-looking angle, liquid crystal is in heeling condition, has produced phase delay, light leak occurred under the cross-polarized light plate.Because white sub-pixels makes display viewing angles narrow down at the light leak (as shown in Figure 6) at side-looking angle.
As shown in Figure 5, four sub-pixels of described pixel cell can be arranged (as Fig. 5 A) for matrix pattern, also can transversely arranged side by side (as Fig. 5 B).
Claims (6)
1. method that realizes that the liquid crystal indicator visual angle is adjustable, described liquid crystal indicator is based on the boundary electric field handoff technique, comprise first substrate, second substrate and liquid crystal layer, first substrate is provided with plane public electrode and pixel electrode, by red sub-pixel, green sub-pixels, the blue subpixels electrode constitutes the pixel electrode of a pixel cell, second substrate is provided with red, green, the blue color color filter, described method is characterized in that: add the 4th sub-pixel and constitute a pixel cell by four sub-pixels, simultaneously on second substrate, plane electrode is set, i.e. the viewing angle control electrode corresponding to the 4th locations of pixels;
When the viewing angle control electrode is in suspended state, liquid crystal in four sub-pixels is all by the boundary electric field control that produces between pixel electrode and the public electrode, liquid crystal changes to control transmitance backlight at the in-plane that is parallel to substrate, and at this moment, liquid crystal indicator is operated in the wide viewing angle pattern;
When the pixel electrode of the 4th sub-pixel adds the voltage identical with public electrode, on the viewing angle control electrode, add another voltage, so that form vertical electric field between public electrode and the control electrode, make the liquid crystal of the 4th pixel region be in vertical state, produce the side-looking light leak, angle of visibility narrows down, and at this moment, liquid crystal indicator is operated in narrow field-of-view mode.
2. the adjustable method in realization liquid crystal indicator according to claim 1 visual angle is characterized in that: described the 4th pixel electrode is the white pixel electrode.
3. the adjustable method in realization liquid crystal indicator according to claim 1 and 2 visual angle is characterized in that: four sub-pixels of described pixel cell are matrix pattern arrangement or transversely arranged side by side.
4. adjustable liquid crystal indicator in visual angle, described liquid crystal indicator is based on the boundary electric field handoff technique, comprise first substrate, second substrate and liquid crystal layer, first substrate is provided with plane public electrode and pixel electrode, by red sub-pixel, green sub-pixels, the blue subpixels electrode constitutes the pixel electrode of a pixel cell, second substrate is provided with red, green, the blue color color filter, it is characterized in that: also include one the 4th pixel electrode in the above the pixel electrode of each pixel cell of first substrate, on second substrate, be provided with the plane electrode that plays the viewing angle control effect that links to each other with signal substrate by electrode wires with the corresponding position of the 4th pixel electrode.
5. the adjustable liquid crystal indicator in visual angle according to claim 4 is characterized in that: described the 4th pixel electrode is the white pixel electrode.
6. according to the adjustable method of claim 4 or 5 described realization liquid crystal indicator visual angles, it is characterized in that: four sub-pixels of described pixel cell are matrix pattern arrangement or transversely arranged side by side.
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