CN117974841A - How to display the watermark screen - Google Patents

Abstract

A display method of a watermark picture generates the watermark picture through a processor based on display data, wherein the watermark picture comprises a watermark pattern and a picture display area. The watermark picture is displayed in a first picture period and a second picture period through the display panel, wherein a first brightness sum of the watermark picture in the first picture period is identical to a second brightness sum of the watermark picture in the second picture period, wherein a first brightness distribution of the watermark pattern displayed in the first picture period is different from a second brightness distribution of the watermark pattern displayed in the second picture period, and a third brightness distribution of the picture display area displayed in the first picture period is different from a fourth brightness distribution displayed in the second picture period.

Description

How to display the watermark screen

Technical Field

The present invention relates to a display method, and in particular to an image display method for displaying a watermark.

Background technique

In confidential documents (such as paper documents or electronic documents), watermarks are usually added to warn users and to leave a clear mark when they are copied. However, in the traditional way of displaying watermarks, when the color tone/grayscale of the displayed information is similar to that of the watermark, it will hinder reading and cause discomfort.

Summary of the invention

The invention provides a method for displaying a watermark picture, which can reduce the flicker between watermark pictures containing watermark patterns.

The present invention provides a method for displaying a watermark image. The method generates a watermark image through a processor based on display data, wherein the watermark image includes a watermark pattern and an image display area; and displays the watermark image through a display panel during a first image period and a second image period, wherein the first brightness sum of the watermark image during the first image period is the same as the second brightness sum of the watermark image during the second image period, wherein the first brightness distribution displayed by the watermark pattern during the first image period is different from the second brightness distribution displayed during the second image period, and the third brightness distribution displayed by the image display area during the first image period is different from the fourth brightness distribution displayed during the second image period.

Based on the above, in the display method of the watermark image in the embodiment of the present invention, by making the first brightness sum of the watermark image during the first frame period the same as the second brightness sum of the watermark image during the second frame period, the brightness difference perceived by the human eye due to the change in brightness distribution can be suppressed to reduce the flicker between the watermark images.

In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of a method for displaying a watermark image according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a watermark screen according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a display timing of a watermark image according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a gamma curve of a method for displaying a watermark image according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a watermark screen according to another embodiment of the present invention.

FIG. 6 is a schematic diagram showing a display timing of a watermark image according to another embodiment of the present invention.

FIG. 7 is a schematic diagram of a gamma curve of a method for displaying a watermark image according to another embodiment of the present invention.

FIG. 8 is a system diagram of a display device according to an embodiment of the present invention.

Description of reference numerals:

100, 200: Watermark screen

110: Watermark pattern

120, 220: Screen display area

221: First sub-display area

222: Second sub-display area

300: Display device system

310: Image processing circuit

320: Timing controller

330: Source driver

340: Gate Driver

350: Display Panel

CSd: First control signal

CSg: Second control signal

DTdisp: Display Data

DTin: Input image data

FP1, FP2, FP3: Screen duration

Gamma1: The first gamma curve

Gamma2: Second gamma curve

Gamma3: The third gamma curve

Gd1, Gd2, Gd3, Gd4, Gd5: Brightness distribution

Gds1, Gds2, Gds3, Gds4, Gds5, Gds6: Sub-brightness distribution

PX: Pixel

TBr1, TBr2, TBx1, TBx2, TBx3: total brightness

Vpx: pixel voltage

SG: Gate signal

S110, S120: Steps

Detailed ways

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

It should be understood that although the terms "first", "second", "third", etc. can be used to describe various elements, components, regions, layers and/or parts in this article, these elements, components, regions, and/or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "component", "region", "layer" or "part" discussed below can be referred to as a second element, component, region, layer or part without departing from the teachings of this article.

The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "one", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "include" and/or "include" specify the presence and/or parts of the features, regions, entireties, steps, operations, elements, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, parts and/or their combinations.

FIG. 1 is a flow chart of a method for displaying a watermark screen according to an embodiment of the present invention. Referring to FIG. 1 , in the present embodiment, the method for displaying a watermark screen includes the following steps. In step S110, a watermark screen is generated by a processor based on display data, wherein the watermark screen includes a watermark pattern and a screen display area. In step S120, a watermark screen is displayed by a display panel during a first screen period and a second screen period, wherein the first brightness sum of the watermark screen during the first screen period (i.e., the sum of the brightness displayed by each pixel in the display panel) is the same as the second brightness sum of the watermark screen during the second screen period. The order of steps S110 and S120 is for illustration, and the embodiment of the present invention is not limited thereto. In addition, the details of steps S110 and S120 can be shown in the embodiments of FIGS. 1 to 8 with reference to FIG.

In addition, during a single frame period, the watermark pattern and the pixels with the same grayscale data in the frame display area may have color difference, that is, display different brightness, so that the watermark pattern is obvious to the image acquisition device. Moreover, the first brightness distribution (that is, the distribution of brightness displayed by all pixels in the display panel) displayed by the watermark pattern during the first frame period is different from the second brightness distribution displayed during the second frame period, and the third brightness distribution displayed by the frame display area during the first frame period is different from the fourth brightness distribution displayed during the second frame period, wherein the first brightness distribution and the fourth brightness distribution can refer to the same gamma curve, and the second brightness distribution and the third brightness distribution can refer to another gamma curve, so that the watermark becomes inconspicuous to the human eye.

According to the above, by making the first brightness sum of the watermark picture during the first frame period equal to the second brightness sum of the watermark picture during the second frame period, the brightness difference perceived by the human eye due to the change in brightness distribution can be suppressed to reduce the flicker between watermark pictures.

FIG. 2 is a schematic diagram of a watermark screen according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a display timing of a watermark screen according to an embodiment of the present invention. Referring to FIG. 2 and FIG. 3, in the present embodiment, a watermark screen 100 generated according to display data may include a watermark pattern 110 and a screen display area 120, and is displayed at least in a first screen period FP1 and a second screen period FP2, that is, the watermark screen 100 may be a static display screen, but the present embodiment is not limited thereto.

Further, during the first frame period FP1, the watermark pattern 110 presents (or displays) a brightness distribution Gd1 (corresponding to the first brightness distribution), and the screen display area 120 presents a brightness distribution Gd2 (corresponding to the third brightness distribution). During the second frame period FP2, the watermark pattern 110 presents a brightness distribution Gd3 (corresponding to the second brightness distribution), and the screen display area 120 presents a brightness distribution Gd4 (corresponding to the fourth brightness distribution). Among them, the first brightness sum TBr1 of the watermark screen 100 during the first frame period FP1 is the same as the second brightness sum TBr2 of the watermark screen 100 during the second frame period FP2. Among them, the first brightness distribution Gd1 displayed by the watermark pattern 110 during the first frame period FP1 is different from the second brightness distribution Gd3 displayed during the second frame period FP2, and the third brightness distribution Gd2 displayed by the screen display area 120 during the first frame period FP1 is different from the fourth brightness distribution Gd4 displayed during the second frame period FP2.

In the embodiment of the present invention, the brightness distribution of the watermark pattern 110 and the screen display area 120 varies with time, so the ratio of the area of the watermark pattern 110 to the area of the screen display area 120 will affect the change of the total brightness (such as TBr1, TBr2). In other words, when the area of the watermark pattern 110 is closer to the area of the screen display area 120, the change of the total brightness (such as TBr1, TBr2) of the watermark screen 100 will be correspondingly smaller. In one embodiment of the present invention, the area of the watermark pattern 110 can be the same as the area of the screen display area 120.

FIG4 is a schematic diagram of a gamma curve of a display method according to an embodiment of the present invention. Referring to FIGS. 2 to 4, in the present embodiment, the corresponding watermark screen 100 is divided into two parts (i.e., the watermark pattern 110 and the screen display area 120), and the display panel can be driven by at least two gamma curves (e.g., the first gamma curve Gamma1 and the second gamma curve Gamma2). For example, the brightness distribution Gd1 and the brightness distribution Gd4 can be determined based on the first gamma curve Gamma1, and the brightness distribution Gd3 and the brightness distribution Gd2 can be determined based on the second gamma curve Gamma2 different from the first gamma curve Gamma1, but the embodiment of the present invention is not limited thereto.

FIG. 5 is a schematic diagram of a watermark screen according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a display timing of a watermark screen according to another embodiment of the present invention. Referring to FIG. 6, in this embodiment, a watermark screen 200 generated according to display data may include a watermark pattern 110 and a screen display area 220, wherein the screen display area 220 includes at least one first sub-display area (here, two sub-display areas 221 are used as an example) and at least one second display area (here, two second display areas 222 are used as an example). And the watermark screen 200 is displayed at least in the first screen period FP1, the second screen period FP2, and the third screen period FP3, that is, the watermark screen 200 may be a static display screen, but the embodiment of the present invention is not limited thereto.

Further, during the first frame period FP1, the watermark pattern 110 presents a brightness distribution Gd1, the first sub-display area 221 presents a sub-brightness distribution Gds1 (corresponding to the first sub-brightness distribution), and the second sub-display area 222 presents a sub-brightness distribution Gds2 (corresponding to the fourth sub-brightness distribution). During the second frame period FP2, the watermark pattern 110 presents a brightness distribution Gd3, the first sub-display area 221 presents a sub-brightness distribution Gds3 (corresponding to the second sub-brightness distribution), and the second sub-display area 222 presents a sub-brightness distribution Gds4 (corresponding to the fifth sub-brightness distribution). During the third frame period FP3, the watermark pattern 110 presents a brightness distribution Gd5 (corresponding to the fifth brightness distribution), the first sub-display area 221 presents a sub-brightness distribution Gds5 (corresponding to the third sub-brightness distribution), and the second sub-display area 222 presents a sub-brightness distribution Gds6 (corresponding to the sixth sub-brightness distribution). Among them, the total brightness TBx3 (corresponding to the third total brightness) of the watermark image 200 in the third frame period FP3 can be the same as the total brightness TBx1 of the watermark image 200 in the first frame period FP1 and the total brightness TBx2 of the watermark image 200 in the second frame period FP2, that is, the total brightness TBx1, TBx2 and TBx3 can be completely the same or almost the same, which can be determined according to the circuit design, and the embodiment of the present invention is not limited to this.

In this embodiment, the brightness distribution Gd1, brightness distribution Gd3 and brightness distribution Gd5 of the watermark pattern 110 are different from each other, the sub-brightness distribution Gds1, sub-brightness distribution Gds3, and sub-brightness distribution Gds5 of the first sub-display area 221 are different from each other, and the sub-brightness distribution Gds2, sub-brightness distribution Gds4, and sub-brightness distribution Gds6 of the second sub-display area 222 are different from each other.

In an embodiment of the present invention, the brightness distribution of the watermark pattern 110, the first sub-display area 221 and the second sub-display area 222 varies with time, so the ratio of the areas of the watermark pattern 110, the first sub-display area 221 and the second sub-display area 222 will affect the change of the total brightness (such as TBx1, TBx2, TBx3). In other words, when the ratio of the areas of the watermark pattern 110, the first sub-display area 221 and the second sub-display area 222 is more exclusive, the change of the total brightness (such as TBx1, TBx2, TBx3) of the watermark screen 100 will become smaller accordingly. In an embodiment of the present invention, the areas of the watermark pattern 110, the first sub-display area 221 and the second sub-display area 222 can be the same.

FIG. 7 is a schematic diagram of a gamma curve of a display method according to an embodiment of the present invention. Referring to FIGS. 5 to 7 , in the present embodiment, the corresponding watermark screen 200 is divided into three parts (i.e., the watermark pattern 110, two sub-display areas 221, and two second display areas 222), and the display panel can be driven by at least three gamma curves (e.g., the first gamma curve Gamma1, the second gamma curve Gamma2, and the third gamma curve Gamma3). For example, the brightness distribution Gd1, the sub-brightness distribution Gds3, and the sub-brightness distribution Gds6 can be determined based on the first gamma curve Gamma1, the brightness distribution Gd2, the sub-brightness distribution Gds5, and the sub-brightness distribution Gds2 can be determined based on the second gamma curve Gamma2 different from the first gamma curve Gamma1, and the brightness distribution Gd5, the sub-brightness distribution Gds1, and the sub-brightness distribution Gds4 can be determined based on the third gamma curve Gamma3 different from the first gamma curve Gamma1 and the second gamma curve Gamma2.

In the above embodiment, when the watermark screen 100 is driven by being divided into two parts (i.e., the watermark pattern 110 and the screen display area 120), the areas of the two parts can be 1/2 of the area of the watermark screen 100, so that the change of the total brightness of the watermark screen 100 becomes smaller; when the watermark screen 200 is driven by being divided into three parts (i.e., the watermark pattern 110, the two sub-display areas 221 and the two second display areas 222), the areas of the three parts can be 1/3 of the area of the watermark screen 200, so that the change of the total brightness of the watermark screen 200 becomes smaller. In other words, when the watermark screen (e.g., 100, 200) is driven by being divided into N parts, the area of each part can be 1/N of the area of the watermark screen (e.g., 100, 200), so that the change of the total brightness of the watermark screen (e.g., 100, 200) becomes smaller, where N is a positive integer greater than or equal to 2.

FIG8 is a system diagram of a display device according to an embodiment of the present invention. Referring to FIG8 , in this embodiment, the display device system 300 at least includes an image processing circuit 310, a timing controller 320, a source driver 330, a gate driver 340, and a display panel 350, wherein a plurality of pixels PX (e.g., arranged in an array) may be configured on the display panel 350. In addition, the timing controller 320 is coupled to the image processing circuit 310, the source driver 330, and the gate driver 340. The display panel 350 is coupled to the source driver 330 and the gate driver 340.

After receiving the input image data DTin, the image processing circuit 310 may output the display data DTdisp generated based on the input image data DTin to the timing controller 320. Then, the timing controller 320 may output the first control signal CSg to the gate driver 340 based on the display data DTdisp, and output the second control signal CSd to the source driver 330, wherein the first control signal CSg may control the gate driver 340, and the second control signal CSd may control the source driver 330. The gate driver 340 may provide the gate signal SG to the display panel 350 based on the first control signal CSg to turn on the pixels PX column by column, and the source driver 330 may output the pixel voltage Vpx to the display panel 350 based on the second control signal CSd, so as to write the grayscale value corresponding to each pixel PX into each pixel PX based on the display data DTdisp. In the embodiment of the present invention, at least a part of the display method of the watermark screen shown in Figures 1 to 7 may be operated in the image processing circuit 310 and/or the timing controller 320, but the embodiment of the present invention is not limited thereto.

In summary, in the display method of the watermark image in the embodiment of the present invention, the total first brightness of the watermark image during the first frame is equal to the total second brightness of the watermark image during the second frame, so as to suppress the brightness difference perceived by the human eye due to the change in brightness distribution, thereby reducing the flicker between the watermark images.

Although the present invention has been disclosed as above by way of 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 concept and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims (8)

1. A method of displaying a watermark picture, comprising:

Generating a watermark picture through a processor based on display data, wherein the watermark picture comprises a watermark pattern and a picture display area; and

Displaying the watermark picture in a first picture period and a second picture period through a display panel, wherein a first brightness sum of the watermark picture in the first picture period is identical to a second brightness sum of the watermark picture in the second picture period,

Wherein a first luminance distribution of the watermark pattern displayed during the first frame is different from a second luminance distribution of the watermark pattern displayed during the second frame, and a third luminance distribution of the frame display area displayed during the first frame is different from a fourth luminance distribution of the watermark pattern displayed during the second frame.

2. The display method of claim 1, wherein the first luminance distribution and the fourth luminance distribution are determined based on a first gamma curve, and the second luminance distribution and the third luminance distribution are determined based on a second gamma curve different from the first gamma curve.

3. The display method of claim 2, wherein the area of the watermark pattern is the same as the area of the screen display area.

4. The display method of claim 1, further comprising:

Displaying the watermark picture in a third picture period through the display panel, wherein a third brightness sum of the watermark picture in the first picture period is identical to the first brightness sum and the second brightness sum of the watermark picture.

5. The display method according to claim 4, wherein the frame display area comprises at least one first sub-display area and at least one second display area.

6. The display method according to claim 5, wherein a fifth luminance distribution of the watermark pattern displayed during the third frame is different from the first luminance distribution and the second luminance distribution,

A first sub-luminance distribution of the at least one first sub-display area displayed during the first frame, a second sub-luminance distribution of the at least one first sub-display area displayed during the second frame, and a third sub-luminance distribution of the at least one first sub-display area displayed during the third frame are different from each other, and

The fourth sub-luminance distribution displayed in the first frame period, the fifth sub-luminance distribution displayed in the second frame period, and the sixth sub-luminance distribution displayed in the third frame period are different from each other.

7. The display method of claim 6, wherein the first, second, and sixth sub-luminance distributions are determined based on a first gamma curve, the second, third, and fourth sub-luminance distributions are determined based on a second gamma curve different from the first gamma curve, and the fifth, first, and fifth sub-luminance distributions are determined based on a third gamma curve different from the first and second gamma curves.

8. The display method of claim 7, wherein the area of the watermark pattern, the area of the at least one first display area, and the area of the at least one second display area are identical to each other.