CN101916552B

CN101916552B - Privacy display method

Info

Publication number: CN101916552B
Application number: CN201010214939XA
Authority: CN
Inventors: 徐雅玲; 黄郁升; 侯鸿龙
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2010-06-28
Filing date: 2010-06-28
Publication date: 2012-03-28
Anticipated expiration: 2030-06-28
Also published as: CN101916552A

Abstract

The invention discloses an anti-peeping display method which comprises the steps of: displaying a single picture by using a plurality of continuously displayed subframes; and providing various different drive signals by using same gray level of pixels in the picture in a process of displaying the picture, wherein the drive signals express that the same gray level of pixels provide different pixel voltages when the subframes are displayed.

Description

Anti-peeping display method

Technical field

The invention relates to the display technique field, and particularly relevant for a kind of anti-peeping display method.

Background technology

At present; LCD because of have high image quality, volume is little, in light weight and advantages of wide application range is widely used in consumption electronic products such as mobile phone, mobile computer, desktop display and TV, and replaced traditional cathode ray tube (CRT) display gradually and become the main flow of display.

For example vertical orientation type (VA mode) LCD is because of having the characteristics of wide visual angle (wideviewing angle) for LCD, and when the user used individual display in public places, the private data in the display may be spied on by neighbor.Therefore in the prior art LCD that proposes tool embedded (In-cell) peep-proof function is arranged.Particularly, be to produce glitch to disturb correct signal in the prior art with the mode that increases the peep-proof sub-pixel, let the user can see correct signal at positive visual angle, then can receive signal in (visual angle also promptly tilts) with great visual angle and disturb and can't see correct signal.Yet therefore such peep-proof mode can sacrifice the brightness of display panel because must show undesired signal through increasing additional subpixels, also can sacrifice contrast.

Summary of the invention

The purpose of this invention is to provide a kind of anti-peeping display method, can realize that the peep-proof effect also can be improved the problem that influences display panel brightness and contrast that exists in the prior art with great visual angle.

A kind of anti-peeping display method that the embodiment of the invention proposes comprises step: utilize a plurality of sub-picture frame that shows continuously to show individual picture; And in the picture procedure for displaying, the pixel of same gray level provides multiple different drive signals in the picture.Wherein, the pixel of different driving signal representative same gray level when this a little picture frame shows provides pixels with different voltage.

In one embodiment of this invention, above-mentioned drive signal comprises at least one pulsed drive signal.

In one embodiment of this invention, above-mentioned drive signal also comprises the continuous schedule drive signal.

In one embodiment of this invention, above-mentioned picture comprises picture background and image information, has same gray level in the picture background and adopts relevant with image information with a kind of pattern that pixel constituted of drive signal.

In one embodiment of this invention, above-mentioned picture comprises picture background and image information, has same gray level in the picture background and adopts the pattern that pixel constituted with a kind of drive signal not have relevant with image information.

A kind of anti-peeping display method that another embodiment of the present invention proposes is applicable to LCD; And LCD institute picture displayed be suitable for the user with first visual angle but not second visual angle that is different from first visual angle watch.The anti-peeping display method of present embodiment comprises step: show that continuously a plurality of sub-picture frames are to show individual picture; And in the procedure for displaying of picture, the pixel voltage that each pixel is adopted when this a little picture frame shows in the modulation picture presents different GTG so that watch the pixel with same gray level to watch from second visual angle from first visual angle.

In one embodiment of this invention, the first above-mentioned visual angle is positive visual angle, and second visual angle is the inclination visual angle.

In one embodiment of this invention, in the procedure for displaying of picture, watch the pixel voltage of part at least the pixel with same gray level to change from first visual angle.

In one embodiment of this invention, in the procedure for displaying of picture, watching the pixel voltage of other part the pixel with same gray level from first visual angle is constant.

The embodiment of the invention utilizes a plurality of continuous sub-picture frames to show individual picture and in the picture procedure for displaying, make the pixel with same gray level provide different drive signals; So that the pixel voltage of the pixel of same gray level when this a little picture frame shows is by modulation; And then make these pixels when watching with great visual angle, present different GTG, reach peep-proof effect with great visual angle.

For let above and other objects of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and conjunction with figs., elaborates as follows.

Description of drawings

Figure 1A and Figure 1B are respectively showing continuously and adopt continuous schedule drive signal and pulsed drive signal to drive that the GTG value is the light transmission features that pixel appeared of L128 under the positive visual angle in four sub-picture frame SF1～SF4 processes;

The GTG value is the light transmission features that pixel appeared of L192 to Fig. 2 under the positive visual angle for employing pulsed drive signal in four sub-picture frame SF1～SF4 processes of continuous demonstration drives;

Fig. 3 is the picture to display of the embodiment of the invention;

0 degree visual angle of adopting continuous schedule drive signal and pulsed drive signal to drive when Fig. 4 A and Fig. 4 B are respectively the picture background that shows picture shown in Figure 3 and getting and the emulation display result under the 45 degree visual angles;

0 degree visual angle of adopting continuous schedule drive signal and pulsed drive signal to drive when Fig. 4 C and Fig. 4 D are respectively the image information that shows picture shown in Figure 3 and getting and the emulation display result under the 45 degree visual angles;

Fig. 5 adopts continuous schedule drive signal and pulsed drive signal to drive another emulation display result under the 45 degree visual angles that get when showing the picture background of picture shown in Figure 3.

Wherein, Reference numeral:

SF1～SF4: sub-picture frame

Embodiment

The embodiment of the invention will combine Fig. 1 to Fig. 5 to specify a kind of anti-peeping display method, and it can be realized with great visual angle peep-proof and can improve the problem that influences display panel brightness and contrast that exists in the prior art.The anti-peeping display method that the embodiment of the invention proposes mainly is to utilize LCD pixel transmittance (transmittance) different characteristic under different visual angles.As everyone knows, for plane internal conversion LCD, its pixel transmittance and visual angle size are parabolic relation, that is position, 0 degree visual angle transmittance is the highest and the big more transmittance in visual angle is low more; Therefore, the anti-peeping display method that the embodiment of the invention proposes can be applicable to vertical alignment mode (VA mode) LCD, but the present invention is not as limit.

In embodiments of the present invention; It is to utilize the sub-picture frame of a plurality of continuous demonstrations to show individual picture; Below will show individual pictures as giving an example to utilize four sub-picture frames that show continuously, but the present invention is as limit, those skilled in the art can be provided with the quantity of sub-picture frame according to the picture frame frequency (frame frequency) of LCD; For example working as the picture frame frequency is 240HZ, and the quantity that sub-picture frame can be set is four.

Referring to Figure 1A and Figure 1B, it is respectively out showing continuously and adopts continuous schedule drive signal and pulsed drive signal to drive that the GTG value is the light transmission features that pixel appeared of L128 under the positive visual angle in four sub-picture frame SF1～SF4 processes.

Shown in Figure 1A; Under the situation that adopts continuous schedule drive pixel; It is identical that transmittance that pixel is appeared in each sub-picture frame SF1～SF4 keeps, and just the value of transmittance is different under positive visual angle and inclination visual angle, and for example the transmittance under 0 degree visual angle and the 45 degree visual angles is about 0.227 and 0.131 respectively; The final GTG value that correspondingly under positive visual angle and inclination visual angle, appears is also different, and for example the final GTG value under 0 degree visual angle and the 45 degree visual angles is about L128 and L99 respectively.

At this, the transmittance that is appeared among each sub-picture frame SF1～SF4 is identical, and representative offers pixel in each sub-picture frame SF1～SF4 procedure for displaying pixel voltage is identical, that is pixel voltage is constant.In addition, need to prove that positive visual angle and inclination visual angle can be thought an angular field of view usually, its value is not limited to be respectively 0 degree and 45 degree.

Shown in Figure 1B; Under the situation that adopts pulsed drive signal driving pixels; Pixel is different with the transmittance that in sub-picture frame SF4, is appeared at sub-picture frame SF1～SF3; At this; The different representatives of transmittance that appeared among sub-picture frame SF1～SF3 and the sub-picture frame SF4 offer the pixel voltage of pixel in sub-picture frame SF1～SF3 procedure for displaying different with the pixel voltage that in sub-picture frame SF4 procedure for displaying, offers pixel, and the pixel voltage that offers pixel when for example showing sub-picture frame SF4 offers the pixel voltage of pixel when showing sub-picture frame SF1～SF3, that is pixel voltage changes.In Figure 1B, the average transmittance under 0 degree visual angle and the 45 degree visual angles is about 0.229 and 0.073 respectively, and correspondingly the final GTG value under 0 degree visual angle and the 45 degree visual angles (that is average GTG value) is about L128 and L76 respectively.

Relatively Figure 1A can find with Figure 1B: when the employing different drive signals drives positive visual angle and has the pixel of same gray level value; The final GTG value that appears is different under the inclination visual angle; GTG value when for example adopting the continuous schedule drive signal to drive is L99, and the GTG value when adopting the pulsed drive signal to drive then is L76.

Need to prove; Be merely shown in Figure 1A and Figure 1B for example; For the pixel of any GTG value under showing positive visual angle; The kenel that the designer can set the pulsed drive signal according to the pixel transmittance and the relation between the size of visual angle of LCD; For example show and to adopt the kenel of pulsed drive signal shown in Figure 2 when the GTG value is the pixel of L192 under the positive visual angle, that is the pixel voltage that offers pixel when showing sub-picture frame SF2 offers the pixel voltage of pixel when showing sub-picture frame SF1 and offers the pixel voltage of pixel when showing sub-pixel SF3 and SF4.

Referring to Fig. 3, it is individual picture to display of the embodiment of the invention.Picture shown in Figure 3 comprises image information " AB " and grey screen background, and image information " AB " is positioned at picture background.At this; The GTG value supposition of each pixel under positive visual angle is all L128 in the picture background; The GTG value supposition of each pixel under positive visual angle is all L64 in the image information " A ", and the GTG value supposition of each pixel under positive visual angle is all L96 in the image information " B ".

Referring to Fig. 4 A and Fig. 4 B, its picture background that is respectively no image information adopt continuous schedule drive signal and two kinds of drive signals of pulsed drive signal to drive to show and must 0 degree visual angle and the emulation display result under the 45 degree visual angles.Particularly, under 0 degree visual angle, shown in Fig. 4 A, the final GTG value that shows of each pixel is all identical in the picture background, that is L128.Yet, under 45 degree visual angles, shown in Fig. 4 B, demonstrate pattern " BA " in the picture background, at this, each pixel of forming pattern " BA " adopts the pulsed drive signal to drive, and its GTG value is L76; And each pixel except that the pixel of forming pattern " BA " adopts the continuous schedule drive signal to drive, and its GTG value is L99.Need to prove at this; Picture background in the present embodiment is actually and does not comprise among Fig. 3 by the occupied part of image information " AB "; In order to make pattern " BA " be easy to identification and be convenient to purpose of description; Just in Fig. 4 A and 4B, the occupied part of image information " AB " is shown, and get complete pattern " BA ".

Referring to Fig. 4 C and Fig. 4 D, its be respectively that image information " A " and " B " all adopt continuous schedule drive signal and two kinds of drive signals of pulsed drive signal to drive to show and must 0 degree visual angle and the emulation display result under the 45 degree visual angles.Particularly, under 0 degree visual angle, shown in Fig. 4 C, the final GTG value that shows of each pixel is all identical in the image information " A ", that is L64; The final GTG value that shows of each pixel is all identical in the image information " B ", that is L96.Yet under 45 degree visual angles, shown in Fig. 4 D, each pixel of image information " A " bend filling part adopts the pulsed drive signal to drive, and its GTG value is L51; Each pixel of other filling part in the image information " A " except that the oblique line filling part adopts the continuous schedule drive signal to drive, and its GTG value is L73; Each pixel of image information " B " bend filling part adopts the pulsed drive signal to drive, and its GTG value is L61; Each pixel of other part in the image information " B " except that the oblique line filling part adopts the continuous schedule drive signal to drive, and its GTG value is L87.

So far; In four sub-picture frames that show continuously, adopt a plurality of different drive signals to drive through each pixel that has same gray level under the positive visual angle to picture background in the picture and image information; The pixel voltage of each pixel of modulation in the picture procedure for displaying by this; Make under the inclination visual angle and to disturb and can't see correct picture, reach peep-proof effect with great visual angle through the pattern in the picture background.

In addition; The pattern that under the inclination visual angle, shows in the picture background in the foregoing description relevant with image information (for example pattern " BA " is the mirror image of image information " AB "); The pattern that the right embodiment of the invention is not limited to show in the picture background under the visual angle is relevant with image information; It is irrelevant that it can not have image information yet, for example shown in Figure 5.Particularly, in Fig. 5, the pattern that picture background shows under the 45 degree visual angles comprises the Q-RING that a plurality of arrays are arranged, and itself and image information for example " AB " are irrelevant; In other words, when showing any picture, have the same gray level value under the positive visual angle and adopt each locations of pixels to need not to do corresponding adjustment, help simplified design with the change of image information with a kind of drive signal.Moreover; The drive signal that pixel adopted that drives same gray level under the positive visual angle in the foregoing description comprises continuous schedule drive signal and pulsed drive signal; But the present invention is as limit, also can adopt the pulsed drive signal of a plurality of different kenels to drive the pixel that has same gray level under the positive visual angle and realize the peep-proof effect.

In sum; The embodiment of the invention is utilized a plurality of sub-picture frames to show individual picture and in the picture procedure for displaying, is made the pixel with same gray level provide different drive signals; So that the pixel voltage of the pixel of same gray level when this a little picture frame shows is by modulation; And then make these pixels when watching with great visual angle, present different GTG, reach peep-proof effect with great visual angle.

Though the present invention with preferred embodiment openly as above; But be not that any those skilled in the art is not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little change and modification, so protection scope of the present invention is as the criterion when looking the accompanying Claim book person of defining.

Claims

1. A peep-proof display method, comprising the steps of:

displaying a single image using a plurality of sub-frames displayed in succession; and

During the display process of the picture, the pixels of the same gray scale in the picture are provided with a variety of different driving signals, the different driving signals are pulse driving signals and continuous driving signals, or a variety of different types of pulses drive signal, so that the pixels with the same gray scale when viewed from the front viewing angle display different gray scales when viewed from the oblique viewing angle, so as to realize anti-peeping display;

Wherein, the different driving signals represent that the pixels of the same gray scale are provided with different pixel voltages when the sub-frame is displayed.

2. The anti-peeping display method according to claim 1, wherein the picture includes a picture background and a picture information, the picture background has a pattern formed by pixels with the same gray scale and using the same driving signal Related to the screen information.

3. The anti-peeping display method according to claim 1, wherein the picture includes a picture background and a picture information, the picture background has a pattern formed by pixels having the same gray scale and using the same driving signal This screen information is irrelevant.

4. A peep-proof display method, which is suitable for liquid crystal displays, and the picture displayed by the liquid crystal display is suitable for users to watch from a first viewing angle rather than a second viewing angle different from the first viewing angle, characterized in that, The anti-peeping display method includes the steps of:

Display multiple sub-frames in succession to display a single frame; and

During the display process of the picture, adjust the pixel voltage used by each pixel in the picture when the sub-frames are displayed, so that the pixels with the same gray scale viewed from the first viewing angle appear from the second viewing angle. Different shades of gray.

5. The anti-peeping display method according to claim 4, wherein the first viewing angle is a front viewing angle, and the second viewing angle is an oblique viewing angle.

6 . The anti-peeping display method according to claim 4 , wherein, during the display process of the frame, at least part of the pixel voltages of the pixels with the same gray scale viewed from the first viewing angle are changed. 6 .

7 . The anti-peeping display method according to claim 6 , wherein, during the display process of the picture, the pixel voltages of other parts of the pixels having the same gray scale viewed from the first viewing angle are constant. 8 .