CN101916552B - Anti-peeping display method - Google Patents

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

Privacy display method

technical field

The invention relates to the field of display technology, and in particular to a peep-proof display method.

Background technique

At present, liquid crystal displays are widely used in consumer electronic products such as mobile phones, notebook computers, desktop monitors, and televisions due to their advantages of high image quality, small size, light weight, and wide application range, and have gradually replaced traditional Cathode ray tube (CRT) monitors have become the mainstream of monitors.

Liquid crystal displays such as vertically aligned (VA mode) liquid crystal displays have the characteristics of wide viewing angles. When a user uses a personal display in a public place, the private data in the display may be peeped by neighbors. Therefore, liquid crystal displays with in-cell anti-peeping functions have been proposed in the prior art. Specifically, in the prior art, a false signal is generated by adding anti-peeping sub-pixels to interfere with the correct signal, so that the user will see the correct signal at the front viewing angle, but will be interfered by the signal at the large viewing angle (that is, the oblique viewing angle) And can not see the correct signal. However, such an anti-peeping method will sacrifice the brightness and contrast of the display panel because additional sub-pixels must be added to display interference signals.

Contents of the invention

The purpose of the present invention is to provide an anti-peeping display method, which can realize the effect of anti-peeping with a large viewing angle and can improve the problems existing in the prior art that affect the brightness and contrast of the display panel.

An anti-peeping display method proposed by an embodiment of the present invention includes the steps of: using a plurality of sub-frames displayed continuously to display a single picture; drive signal. Wherein, different driving signals represent that pixels of the same gray scale are provided with different pixel voltages when the sub-frames are displayed.

In an embodiment of the present invention, the aforementioned driving signal includes at least one pulsed driving signal.

In an embodiment of the present invention, the above-mentioned driving signal further includes a continuous driving signal.

In an embodiment of the present invention, the above-mentioned picture includes a picture background and picture information, and a pattern formed by pixels having the same gray scale and using the same driving signal in the picture background is related to the picture information.

In an embodiment of the present invention, the above-mentioned picture includes a picture background and picture information, and a pattern formed by pixels having the same gray scale and using the same driving signal in the picture background has nothing to do with the picture information.

Another embodiment of the present invention provides an anti-peeping display method, which is suitable for a liquid crystal display; and the picture displayed by the liquid crystal display is suitable for a user to watch from a first viewing angle rather than a second viewing angle different from the first viewing angle. The anti-peeping display method of this embodiment includes the steps of: continuously displaying a plurality of sub-picture frames to display a single picture; In order to make the pixels with the same gray scale viewed from the first viewing angle present different gray scales viewed from the second viewing angle.

In an embodiment of the present invention, the above-mentioned first viewing angle is a normal viewing angle, and the second viewing angle is an oblique viewing angle.

In an embodiment of the present invention, during the display process of the picture, the pixel voltages of at least some of the pixels with the same gray scale are changed when viewed from the first viewing angle.

In an embodiment of the present invention, during the display process of the picture, the pixel voltages of other parts of the pixels with the same gray scale viewed from the first viewing angle are constant.

In the embodiment of the present invention, a plurality of continuous sub-frames are used to display a single picture, and pixels with the same gray scale are provided with different driving signals during the screen display process, so that pixels with the same gray scale are displayed in these sub-frames When the pixel voltage is modulated, these pixels will show different gray scales when viewed from a large viewing angle, achieving the effect of anti-peeping at a large viewing angle.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with accompanying drawings.

Description of drawings

Fig. 1A and Fig. 1B respectively show the light transmission characteristics presented by pixels with a gray scale value of L128 at the front viewing angle by using a continuous driving signal and a pulse driving signal in the process of continuously displaying four sub-frames SF1-SF4;

Fig. 2 shows the light transmission characteristics presented by pixels with a gray scale value of L192 at a normal viewing angle driven by a pulsed driving signal during the continuous display of four sub-frames SF1-SF4;

Fig. 3 is the screen to be displayed in the embodiment of the present invention;

Fig. 4A and Fig. 4B are respectively the simulation display results under the 0-degree viewing angle and the 45-degree viewing angle obtained by using the continuous driving signal and the pulse driving signal to drive the picture background of the picture shown in Fig. 3;

Fig. 4C and Fig. 4D are respectively the simulation display results under the 0-degree viewing angle and the 45-degree viewing angle obtained by using the continuous driving signal and the pulse driving signal to drive the picture information of the picture shown in Fig. 3;

FIG. 5 is another simulation display result obtained under a viewing angle of 45 degrees obtained by driving with a continuous driving signal and a pulse driving signal when displaying the background of the picture shown in FIG. 3 .

Among them, reference signs:

SF1～SF4: sub frame

Detailed ways

An embodiment of the present invention will specifically describe an anti-peeping display method with reference to FIG. 1 to FIG. 5 , which can realize anti-peeping with a large viewing angle and can improve the problems existing in the prior art that affect the brightness and contrast of a display panel. The anti-peeping display method proposed by the embodiment of the present invention mainly utilizes the characteristic of different transmittances of pixels under different viewing angles of the liquid crystal display. As we all know, for an in-plane switching liquid crystal display, the light transmittance of a pixel has a parabolic relationship with the viewing angle, that is, the light transmittance at a viewing angle of 0 degrees is the highest, and the larger the viewing angle, the lower the light transmittance; therefore, the anti- The peep display method can be applied to a vertical alignment mode (VA mode) liquid crystal display, but the present invention is not limited thereto.

In the embodiment of the present invention, it uses multiple sub-frames displayed continuously to display a single picture. The following will use four sub-frames displayed continuously as an example to display a single picture, but the present invention does not rely on this However, those skilled in the art can set the number of sub-frames according to the frame frequency of the liquid crystal display. For example, when the frame frequency is 240HZ, the number of sub-frames can be set to four.

Referring to Fig. 1A and Fig. 1B, they respectively show the light transmission characteristics presented by pixels with a gray scale value of L128 at a normal viewing angle by using a continuous driving signal and a pulse driving signal in the process of continuously displaying four sub-frames SF1-SF4 .

As shown in Figure 1A, in the case of using a continuous driving signal to drive the pixels, the light transmittance of the pixels in each sub-frame SF1-SF4 remains the same, but the light transmittance is different under the normal viewing angle and the oblique viewing angle. The values are different, for example, the light transmittance at 0-degree viewing angle and 45-degree viewing angle are about 0.227 and 0.131 respectively, correspondingly, the final grayscale values presented under normal viewing angle and oblique viewing angle are also different, for example, at 0-degree viewing angle and 45-degree viewing angle The final grayscale values of are about L128 and L99 respectively.

Here, the light transmittance presented in each of the sub-frames SF1 - SF4 is the same, which means that the pixel voltages provided to the pixels are the same during the display process of each of the sub-frames SF1 - SF4 , that is, the pixel voltages are constant. In addition, it should be noted that the normal viewing angle and the oblique viewing angle can generally be regarded as a range of viewing angles, and their values are not limited to 0 degrees and 45 degrees respectively.

As shown in FIG. 1B, in the case of using a pulse-type driving signal to drive the pixels, the light transmittance of the pixels in the sub-frames SF1-SF3 is different from that in the sub-frame SF4. Here, the sub-frames SF1-SF3 The difference in light transmittance between SF3 and sub-frame SF4 means that the pixel voltage provided to the pixels during the display of sub-frames SF1-SF3 is different from the pixel voltage provided to the pixels during the display of sub-frame SF4, for example The pixel voltage provided to the pixels when the sub-frame SF4 is displayed is greater than the pixel voltage provided to the pixels when the sub-frames SF1 - SF3 are displayed, that is, the pixel voltages vary. In Fig. 1B, the average light transmittance at 0-degree viewing angle and 45-degree viewing angle are about 0.229 and 0.073 respectively, and correspondingly, the final grayscale values (that is, the average grayscale value) at 0-degree viewing angle and 45-degree viewing angle are about for L128 and L76.

Comparing Figure 1A and Figure 1B, it can be found that when different driving signals are used to drive pixels with the same gray scale value at the front viewing angle, the final gray scale values presented at the oblique viewing angle are different, for example, when driving with a continuous driving signal The grayscale value of L99 is L99, while the grayscale value is L76 when driven by a pulsed driving signal.

It should be noted that what is shown in FIG. 1A and FIG. 1B is only an example. For a pixel displaying any grayscale value under a normal viewing angle, the designer can set the pixel according to the relationship between the pixel light transmittance of the liquid crystal display and the viewing angle. Determine the type of pulse-type driving signal, for example, when displaying a pixel with a gray scale value of L192 at a normal viewing angle, the type of pulse-type driving signal shown in Figure 2 can be used, that is, the pixel provided to the pixel when displaying sub-frame SF2 The voltage is higher than the pixel voltage provided to the pixel when the sub-frame SF1 is displayed, and smaller than the pixel voltage provided to the pixel when the sub-pixels SF3 and SF4 are displayed.

Referring to FIG. 3 , it is a single picture to be displayed in the embodiment of the present invention. The picture shown in FIG. 3 includes picture information "AB" and a gray picture background, and the picture information "AB" is located in the picture background. Here, the grayscale value of each pixel in the screen background under the normal viewing angle is assumed to be L128, the grayscale value of each pixel in the screen information "A" under the normal viewing angle is assumed to be L64, and the grayscale value of each pixel in the screen information "B" is assumed to be L64. The grayscale values under the normal viewing angle are all assumed to be L96.

Referring to FIG. 4A and FIG. 4B , they are the simulation display results of the 0-degree viewing angle and the 45-degree viewing angle obtained by driving and displaying the picture background with no picture information using two driving signals, the continuous driving signal and the pulse driving signal. Specifically, at a viewing angle of 0 degrees, as shown in FIG. 4A , the final grayscale values displayed by each pixel in the background of the screen are the same, that is, L128. However, at a viewing angle of 45 degrees, as shown in FIG. 4B , the pattern "BA" is displayed in the background of the screen, where each pixel constituting the pattern "BA" is driven by a pulse-type driving signal, and its grayscale value is L76; Each pixel except the pixels forming the pattern "BA" is driven by a continuous driving signal, and its gray scale value is L99. What needs to be explained here is that the screen background in this embodiment does not actually include the part occupied by the screen information "AB" in Figure 3. In order to make the pattern "BA" easy to recognize and easy to describe, it is shown in Figure 3. In 4A and 4B, the portion occupied by the picture information "AB" is presented to obtain the complete pattern "BA".

See Fig. 4C and Fig. 4D, which are the simulations of the 0-degree viewing angle and the 45-degree viewing angle obtained by driving and displaying the screen information "A" and "B" respectively using two driving signals, the continuous driving signal and the pulse driving signal. Show results. Specifically, at a viewing angle of 0 degrees, as shown in FIG. 4C , the final grayscale values displayed by each pixel in the screen information "A" are the same, that is, L64; the final grayscale values displayed by each pixel in the screen information "B" All the same, ie L96. However, at a viewing angle of 45 degrees, as shown in Figure 4D, each pixel in the oblique line filled part of the screen information "A" is driven by a pulse-type driving signal, and its gray scale value is L51; Each pixel in the filled part other than the line filled part is driven by a continuous driving signal, and its gray scale value is L73; each pixel in the oblique line filled part in the screen information "B" is driven by a pulse driving signal, and its gray scale value is L73. The level value is L61; each pixel in the picture information "B" except for the obliquely filled part is driven by a continuous driving signal, and its gray level value is L87.

So far, each pixel with the same gray scale under the normal viewing angle of the screen background and screen information in the screen is driven by using a plurality of different driving signals in four sub-frames displayed continuously, thereby modulating each pixel’s position in the screen. The pixel voltage in the display process makes it impossible to see the correct picture due to the interference of the pattern in the background of the picture under an oblique viewing angle, achieving the anti-peeping effect of a large viewing angle.

In addition, in the above-mentioned embodiments, the pattern displayed in the screen background at an oblique viewing angle is related to the screen information (for example, the pattern "BA" is a mirror image of the screen information "AB"), but the embodiment of the present invention is not limited to the screen background at an oblique viewing angle. The displayed pattern is related to the screen information, and it may not have any screen information, as shown in FIG. 5 for example. Specifically, in Fig. 5, the pattern displayed on the background of the screen at a viewing angle of 45 degrees includes a plurality of square rings arranged in groups, which has nothing to do with the screen information such as "AB"; in other words, when any screen is displayed, the normal viewing angle The position of each pixel with the same gray scale value and the same driving signal does not need to be adjusted accordingly with the change of the picture information, which is conducive to simplifying the design. Furthermore, in the above embodiments, the driving signals used to drive the pixels with the same gray scale under the normal viewing angle include continuous driving signals and pulse driving signals, but the present invention is not limited thereto, and multiple different types can also be used The pulse-type driving signal drives the pixels with the same gray scale under the front viewing angle to achieve the anti-peeping effect.

To sum up, the embodiment of the present invention uses multiple sub-frames to display a single picture and provides different drive signals to pixels with the same gray scale during the screen display process, so that pixels with the same gray scale are displayed in these sub-pictures. The pixel voltage is modulated when the frame is displayed, so that these pixels show different gray scales when viewed at a large viewing angle, achieving the anti-peeping effect at a large viewing angle.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined by the appended claims.

Claims (7)

1. an anti-peeping display method is characterized in that, comprises step:

Utilize a plurality of sub-picture frame that shows continuously to show individual picture; And

In this picture procedure for displaying; The pixel of same gray level provides multiple different drive signals in this picture; This multiple different drive signals is pulsed drive signal and continuous schedule drive signal; Or the pulsed drive signal of multiple different kenels, present different GTG so that watch pixel to watch, thereby realize that peep-proof shows from the inclination visual angle with same gray level from positive visual angle;

Wherein, the pixel of this different drive signals representative this same gray level when this sub-picture frame shows provides pixels with different voltage.

2. anti-peeping display method as claimed in claim 1; It is characterized in that; This picture comprises a picture background and an image information, has same gray level in this picture background and adopts relevant with this image information with a kind of pattern that pixel constituted of this drive signal.

3. anti-peeping display method as claimed in claim 1; It is characterized in that; This picture comprises a picture background and an image information, has same gray level in this picture background and adopts with a kind of pattern that pixel constituted and this image information of this drive signal irrelevant.

4. an anti-peeping display method is applicable to LCD, this LCD institute picture displayed be suitable for the user with one first visual angle but not one be different from this first visual angle second visual angle watch, it is characterized in that this anti-peeping display method comprises step:

Show that continuously a plurality of sub-picture frames are to show individual picture; And

In the procedure for displaying of this picture, the pixel voltage that each pixel is adopted when this a little picture frame shows in this picture of modulation presents different GTG so that watch the pixel with same gray level to watch from this second visual angle from this first visual angle.

5. anti-peeping display method as claimed in claim 4 is characterized in that, this first visual angle is positive visual angle, and this second visual angle is the inclination visual angle.

6. anti-peeping display method as claimed in claim 4 is characterized in that, in the procedure for displaying of this picture, watches the pixel voltage of part at least the pixel with same gray level to change from this first visual angle.

7. anti-peeping display method as claimed in claim 6 is characterized in that, in the procedure for displaying of this picture, it is constant watching the pixel voltage of other part the pixel with same gray level from this first visual angle.

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