TWI410919B - E-privacy displaying method - Google Patents

Abstract

The present invention relates to an E-privacy displaying method. The displaying method includes the following steps of: using continuously-displayed sub-frames to display a single picture frame; and during displaying the picture frame, pixels in the picture frame having a same gray level are provided with a plurality of driving signals different from one another. Moreover, different driving signals represent the pixels having the same gray level being provided with different voltage signals during continuously displaying the sub-frames.

Description

Anti-spy display method

The present invention relates to the field of display technology, and in particular to an anti-spy display method.

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

Liquid crystal displays, such as VA mode liquid crystal displays, have a wide viewing angle. When a user uses a personal display in a public place, the privacy information in the display may be peeked by the neighbors. Therefore, a liquid crystal display having an in-cell anti-spy function has been proposed in the prior art. Specifically, in the prior art, a false signal is generated in a manner that increases the anti-puncture pixel to interfere with the correct signal, so that the user can see the correct signal at a positive viewing angle, and the signal is interfered at a large viewing angle (ie, a tilted viewing angle). I can't see the correct signal. However, such a privacy-preventing method sacrifices the brightness of the display panel by sacrificing contrast by adding additional sub-pixels to display the interference signal.

It is an object of the present invention to provide an anti-spy display method that can achieve a large viewing angle anti-spying effect and can improve the problems existing in the prior art that affect the brightness and contrast of the display panel.

An anti-spy display method according to an embodiment of the present invention includes the steps of: displaying a single picture by using a plurality of sub-frames displayed continuously; and providing a plurality of different drivers of the same gray level in the picture during the picture display process. Signal. Among them, different driving signals represent pixels of the same gray level when these sub-frames are displayed, and different pixel voltages are provided.

In an embodiment of the invention, the driving signal includes at least one pulse driving signal.

In an embodiment of the invention, the driving signal further includes a continuous driving signal.

In an embodiment of the invention, the picture includes a background of the picture and picture information, and the picture formed by the pixels having the same gray level and using the same driving signal in the background of the picture is related to the picture information.

In an embodiment of the invention, the picture includes a background of the picture and the picture information, and the picture formed by the pixels having the same gray level and using the same driving signal in the background of the picture is not related to the picture information.

Another anti-spy display method according to another embodiment of the present invention is applicable to a liquid crystal display; and the screen displayed by the liquid crystal display is suitable for the user to view at a first viewing angle instead of a second viewing angle different from the first viewing angle. The anti-spy display method of the embodiment includes the steps of: continuously displaying a plurality of sub-frames to display a single picture; and, during the display of the picture, modulating the pixels used by the respective pixels in the display of the sub-picture frames in the picture display process. The voltage is such that pixels having the same gray level viewed from the first viewing angle exhibit different gray levels as viewed from the second viewing angle.

In an embodiment of the invention, the first viewing angle is a positive viewing angle, and the second viewing angle is a oblique viewing angle.

In an embodiment of the invention, during the display of the screen, the pixel voltage of at least a portion of the pixels having the same gray level is changed from the first perspective.

In an embodiment of the present invention, the pixel voltage of the other portion of the pixels having the same gray level is constant from the first viewing angle during the display of the screen.

Embodiments of the present invention provide a single picture by using a plurality of consecutive sub-frames and provide different driving signals for pixels having the same gray level during the picture display, so that the pixels of the same gray level are in these When the sub-picture frame is displayed, the pixel voltage is modulated, so that these pixels display different gray levels when viewed from a large viewing angle, achieving a large viewing angle anti-spying effect.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

An embodiment of the present invention will be specifically described with reference to FIG. 1 to FIG. 5 , which can realize a large-view anti-spy and can improve the problems existing in the prior art that affect the brightness and contrast of the display panel. The anti-spy display method proposed by the embodiment of the present invention mainly utilizes characteristics of different transmittances of the liquid crystal display at different viewing angles. It is known that, for an in-plane conversion liquid crystal display, the pixel transmittance is in a parabolic relationship with the viewing angle, that is, the 0-degree viewing angle position is the highest, and the viewing angle is larger, the transmittance is lower; therefore, the present invention proposes The anti-spy display method can be applied to a vertical alignment mode (VA mode) liquid crystal display, but the invention is not limited thereto.

In the embodiment of the present invention, a plurality of consecutively displayed sub-picture frames are used to display a single picture. Hereinafter, a single picture frame is displayed by using four consecutively displayed sub-picture frames as an example, but the present invention does not For example, a person skilled in the art can set the number of sub-picture frames according to the frame frequency of the liquid crystal display. For example, when the picture frame frequency is 240 Hz, the number of sub-picture frames can be set to four.

Referring to FIG. 1A and FIG. 1B, respectively, the pixels displayed by the continuous driving signal and the pulse driving signal in the process of continuously displaying the four sub-frames SF1 to SF4 are displayed with a gray level value of L128. Light characteristics.

As shown in FIG. 1A, in the case where the driving signal is driven by the continuous driving signal, the transmittance of the pixels in each of the sub-frames SF1 to SF4 remains the same, but the transmittance is only in the positive viewing angle and the oblique viewing angle. The values are different, for example, the light transmittance at a viewing angle of 0 degrees and a viewing angle of 45 degrees are about 0.227 and 0.131, respectively, and correspondingly, the final grayscale values appearing under a positive viewing angle and a tilting viewing angle are different, for example, a 0 degree viewing angle and a 45 degree angle. The final grayscale values at the viewing angle are approximately L128 and L99, respectively. Here, the light transmittances presented in the respective sub-frames SF1 to SF4 are the same, and the pixel voltages supplied to the pixels in the display process of the respective sub-frames SF1 to SF4 are the same, that is, the pixel voltage is constant. In addition, it should be noted that the positive viewing angle and the oblique viewing angle are generally considered to be a range of viewing angles, and the values thereof are not limited to 0 degrees and 45 degrees, respectively.

As shown in FIG. 1B, in the case of using a pulsed driving signal to drive a pixel, the pixel has a different transmittance in the sub-frames SF1 to SF3 than in the sub-frame SF4, where the sub-frame is The difference in light transmittance between SF1 and SF3 and the sub-frame SF4 represents the pixel voltage supplied to the pixels in the display process of the sub-frames SF1 to SF3 and the picture provided to the pixels in the display process of the sub-frame SF4. The pixel voltages are different. For example, when the sub-frame SF4 is displayed, the pixel voltage supplied to the pixels is greater than the pixel voltage supplied to the pixels when the sub-frames SF1 to SF3 are displayed, that is, the pixel voltage is varied. In FIG. 1B, the average light transmittances at a 0 degree angle of view and a 45 degree angle of view are about 0.229 and 0.073, respectively, and correspondingly the final gray scale values (ie, the average gray scale values) at a 0 degree angle of view and a 45 degree angle of view are respectively about For L128 and L76.

Comparing FIG. 1A and FIG. 1B, it can be found that when different driving signals are used to drive pixels with the same grayscale value in the positive viewing angle, the grayscale values finally presented under the oblique viewing angle are different, for example, driven by a continuous driving signal. The grayscale value of the time is L99, and the grayscale value when driving with the pulsed driving signal is L76.

It should be noted that, FIG. 1A and FIG. 1B are only examples. For a pixel displaying an arbitrary gray scale value under a positive viewing angle, the designer can determine the relationship between the pixel transmittance and the viewing angle of the liquid crystal display. To set the type of the pulsed driving signal, for example, when displaying a pixel with a grayscale value of L192 at a positive viewing angle, the type of the pulsed driving signal shown in FIG. 2 can be used, that is, the image is provided when the sub-frame SF2 is displayed. The pixel voltage of the prime is greater than the pixel voltage supplied to the pixel when the sub-frame SF1 is displayed, and is smaller than the pixel voltage supplied to the pixel when the sub-pixels SF3 and SF4 are displayed.

Referring to Figure 3, a single picture to be displayed in relation to an embodiment of the present invention is illustrated. The screen shown in FIG. 3 includes screen information "AB" and a gray screen background, and screen information "AB" is located in the background of the screen. Here, the grayscale values of the respective pixels in the background background are assumed to be L128, and the grayscale values of the pixels in the picture information "A" under the positive viewing angle are assumed to be L64, and the picture information is "B". The gray scale values of each pixel under the positive viewing angle are assumed to be L96.

Referring to FIG. 4A and FIG. 4B, respectively, the background of the screen without the screen information is driven by the driving signals of the continuous driving signal and the pulse driving signal, and the simulation display results are obtained at a 0 degree angle of view and a 45 degree angle of view. . Specifically, at a 0 degree angle of view, as shown in FIG. 4A, the grayscale values finally displayed by the respective pixels 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, a pattern "BA" is displayed in the background of the screen, where each pixel constituting the pattern "BA" is driven by a pulse driving signal, and the grayscale value is L76; and each pixel except the pixel constituting the pattern "BA" is driven by a continuous driving signal, and its grayscale value is L99. It should be noted that the background of the picture in this embodiment does not actually include the portion occupied by the picture information “AB” in FIG. 3, and the picture “BA” is easy to recognize and convenient for description. In 4A and 4B, the portion occupied by the picture information "AB" is presented, and the complete pattern "BA" is obtained.

Referring to FIG. 4C and FIG. 4D, the screen information "A" and "B" are respectively driven by the driving signals of the continuous driving signal and the pulse driving signal to obtain a 0 degree angle of view and a 45 degree angle of view. The simulation shows the results. Specifically, at a 0 degree angle of view, as shown in FIG. 4C, the grayscale values of the respective pixels in the picture information “A” are the same, that is, L64; the gray of each pixel in the picture information “B” is finally displayed. The order values are the same, that is, L96. However, at a viewing angle of 45 degrees, as shown in FIG. 4D, each pixel of the oblique line filling portion in the picture information "A" is driven by a pulse driving signal, and its grayscale value is L51; Each pixel of the other filling portion except the slanted line filling portion is driven by a continuous driving signal, and its gray scale value is L73; each pixel of the slanted line filling portion in the picture information "B" is driven by a pulse driving signal. The grayscale value is L61; each pixel of the picture information "B" except the oblique line padding portion is driven by a continuous driving signal, and the grayscale value is L87.

At this point, each pixel having the same gray level under the positive viewing angle of the screen background and the screen information in the screen is driven by a plurality of different driving signals in the four sub-frames of the continuous display, thereby modulating the respective pixels. The pixel voltage during the screen display makes it impossible to see the correct picture by the pattern interference in the background of the picture under the oblique viewing angle, and achieves a large viewing angle anti-spying effect.

In addition, in the above embodiment, the pattern displayed in the background of the screen in the 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 background of the screen under the oblique viewing angle. The pattern displayed in the screen is related to the screen information, and it may be independent of the screen information, for example, as shown in FIG. Specifically, in FIG. 5, the pattern displayed on the background of the screen at a 45 degree angle of view includes a plurality of square rings arranged in an array, which is independent of picture information such as "AB"; in other words, when displaying any picture, the front view is The position of each pixel having the same grayscale value and using the same driving signal does not need to be adjusted correspondingly with the change of the screen information, which is advantageous for simplifying the design. Furthermore, in the above embodiment, the driving signals used to drive the pixels of the same gray level in the positive viewing angle include the continuous driving signal and the pulse driving signal, but the invention is not limited thereto, and a plurality of different types may be adopted. The pulsed driving signal of the state drives the pixels with the same gray level in the positive viewing angle to achieve the anti-peep effect.

In summary, the embodiment of the present invention uses a plurality of sub-frames to display a single picture and provides pixels with the same gray level with different driving signals during the picture display process, so that the pixels of the same gray level are obtained. The pixel voltages when these sub-frames are displayed are modulated, so that these pixels exhibit different gray levels when viewed from a large viewing angle, achieving a large viewing angle anti-spying effect.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

SF1~SF4‧‧‧Sub frame

FIG. 1A and FIG. 1B respectively illustrate the light transmission characteristics of pixels with a gray scale value of L128 driven by a continuous driving signal and a pulsed driving signal during continuous display of four sub-frames SF1 to SF4.

FIG. 2 illustrates the light transmission characteristics of a pixel with a grayscale value of L192 driven by a pulsed driving signal during a continuous viewing of four sub-frames SF1 to SF4.

Figure 3 illustrates a screen to be displayed in relation to an embodiment of the present invention.

4A and FIG. 4B respectively show simulated display results at a 0 degree angle of view and a 45 degree angle of view when the screen background of the screen shown in FIG. 3 is displayed, which is driven by a continuous driving signal and a pulse driving signal.

4C and FIG. 4D respectively show simulated display results at a 0 degree angle of view and a 45 degree angle of view when the screen information of the screen shown in FIG. 3 is displayed, which is driven by a continuous driving signal and a pulse driving signal.

FIG. 5 is a diagram showing another simulation display result at a 45-degree angle of view driven by a continuous driving signal and a pulse driving signal when the screen background of the screen shown in FIG. 3 is displayed.

SF1~SF4. . . Sub frame

Claims (7)

An anti-spy display method includes the steps of: displaying a single picture by using a plurality of sub-frames continuously displayed; in the picture display process, pixels of the same gray level in the picture are provided with a pulse driving signal or a continuous driving a signal; wherein, when the pulse driving signal is provided, the sub-frames exhibit the same transmittance, and the pixel voltage of the pixel of the same gray level in the picture is displayed during the display of the sub-frames Constantly; and when the continuous driving signal is provided, a portion of the sub-frames and the other portion of the sub-frames exhibit different transmittances, and a portion of the sub-frames are displayed. The pixel voltages supplied to the pixels of the same gray level in the picture are different from the pixel voltages of the pixels of the same gray level provided in the picture during the display of another part of the sub-frames. The anti-spy display method of claim 1, wherein the picture comprises a background of a picture and a picture information, wherein the picture has the same gray level and a pattern of pixels of the same driving signal. It is related to the screen information. The anti-spy display method of claim 1, wherein the picture comprises a background of a picture and a picture information, wherein the picture has the same gray level and a pattern of pixels of the same driving signal. It is irrelevant to this screen information. Anti-spy display method suitable for liquid crystal display, the liquid crystal display The displayed screen is adapted for the user to view with a first viewing angle instead of a second viewing angle different from the first viewing angle, the anti-spy display method comprising the steps of: continuously displaying a plurality of sub-frames to display a single picture; During the display of the screen, modulating the pixel voltages used by the pixels in the screen to display the sub-picture frames, so that the pixels having the same gray level are viewed from the first view from the second Viewing angles show different gray levels. The anti-spy display method of claim 4, wherein the first viewing angle is a positive viewing angle, and the second viewing angle is a oblique viewing angle. The anti-spy display method of claim 4, wherein in the display of the picture, the pixel voltage of at least a portion of the pixels having the same gray level is changed from the first view. The anti-spy display method according to claim 6, wherein the pixel voltage of the other portion of the pixels having the same gray level is constant from the first viewing angle during the display of the screen.