CN115497407A - Driving method of peep-proof display device and peep-proof display device - Google Patents

Driving method of peep-proof display device and peep-proof display device Download PDF

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Publication number
CN115497407A
CN115497407A CN202110678299.6A CN202110678299A CN115497407A CN 115497407 A CN115497407 A CN 115497407A CN 202110678299 A CN202110678299 A CN 202110678299A CN 115497407 A CN115497407 A CN 115497407A
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China
Prior art keywords
image data
display
data signal
display panel
peep
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CN202110678299.6A
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Chinese (zh)
Inventor
苏振豪
曾俊钦
徐福增
黄竑旻
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Hannstar Display Corp
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Hannstar Display Corp
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Priority to CN202110678299.6A priority Critical patent/CN115497407A/en
Publication of CN115497407A publication Critical patent/CN115497407A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a driving method of a peep-proof display device and the peep-proof display device, wherein the peep-proof display device comprises a display panel, and the driving method comprises the following steps: when the peep-proof display device displays a picture on the display panel in the peep-proof display mode, receiving input image data of the picture; and generating output image data, wherein the output image data comprises an image data signal, the image data signal is generated according to the input image data, and the resolution of the image data signal is smaller than that of the input image data. The invention can reduce hardware cost while providing a peep-proof function, and can switch the normal display mode and the peep-proof display mode through the drive setting, thereby increasing the convenience in use.

Description

Driving method of peep-proof display device and peep-proof display device
Technical Field
The present invention relates to the field of display, and more particularly, to a driving method of a privacy display apparatus and a privacy display apparatus.
Background
Most display devices today have a wide viewing angle display effect, but in some situations, such as when confidential information or private information is processed, the displayed confidential information may be peeped by others due to the wide viewing angle effect of the display device, resulting in a risk of information leakage. In order to avoid the risk, a peep-proof sheet can be additionally arranged on the display device to reduce the visual angle of the display device, so that the peep-proof effect is achieved. However, the conventional display devices with the peep-proof function are additionally provided with a peep-proof sheet (or peep-proof polarizer), so that the cost of hardware is increased. Further, if the anti-peeping sheet is fixed, the user cannot directly change the display panel to the one in which the anti-peeping function is disabled, resulting in limitation in use. On the other hand, if the peep-proof sheet is mounted, the user needs to manually mount or dismount the peep-proof sheet when the peep-proof function is activated or deactivated, which is inconvenient to use and easy to scratch or even damage due to external force while carrying.
Disclosure of Invention
The present invention is directed to a driving method of a privacy protection display device and a privacy protection display device, which can reduce hardware cost while providing a privacy protection function, and can switch between a normal display mode and a privacy protection display mode by driving setting, thereby increasing convenience in use.
According to the above object, the present invention discloses a driving method of a privacy protection display device, the privacy protection display device includes a display panel, and the driving method includes: when the peep-proof display device displays a picture on the display panel in the peep-proof display mode, receiving input image data of the picture; and generating output image data, wherein the output image data comprises an image data signal, the image data signal is generated according to the input image data, and the resolution of the image data signal is smaller than that of the input image data.
According to some embodiments of the present invention, the display panel has a display area and a peripheral area, the output image data further includes a peep-proof data signal of the peep-proof image, and the peep-proof display device simultaneously displays the image and the peep-proof image in the display area of the display panel.
According to some embodiments of the present invention, the display panel comprises a plurality of pixels, the plurality of pixels are located in the display area, and the driving method further comprises: generating an image driving signal according to the image data signal; generating a peep-proof driving signal according to the peep-proof data signal; transmitting the image driving signal to a part of a plurality of pixels of the display panel so as to display a picture on a part of a display area of the display panel; and transmitting the peep-proof driving signal to another part of the plurality of pixels of the display panel so as to display the peep-proof image on another part of the display area of the display panel.
According to some embodiments of the invention, the driving method further comprises: when the peep-proof display device displays another picture on the display panel in the normal display mode, receiving another input image data of the other picture; and generating another output image data, wherein the another output image data comprises another image data signal, wherein the another image data signal is generated according to the another input image data, and the resolution of the another image data signal is equal to the resolution of the another input image data.
According to some embodiments of the present invention, the resolution of the input image data is M × N, the resolution of the image data signal is I × J, wherein M, N, I, J is a positive integer greater than 0, I is less than M, and J is equal to N.
According to some embodiments of the present invention, the resolution of the input image data is M × N, the resolution of the image data signal is I × J, wherein M, N, I, J is a positive integer greater than 0, I is equal to M, and J is less than N.
According to some embodiments of the present invention, the resolution of the input image data is M × N, the resolution of the image data signal is I × J, wherein M, N, I, J is a positive integer greater than 0, I is less than M, and J is less than N.
According to the above object, the present invention also discloses a peep-proof display device, comprising: a time sequence control circuit and a display panel; when the peep-proof display device displays a picture on the display panel in the peep-proof display mode, the time sequence control circuit receives input image data of the picture; and the time sequence control circuit generates output image data, wherein the output image data comprises an image data signal, the image data signal is generated according to the input image data, and the resolution of the image data signal is smaller than that of the input image data.
According to some embodiments of the present invention, the anti-peeping display device further comprises a memory, wherein in the step of generating the output image data by the timing control circuit, the input image data is stored in the memory, and the timing control circuit reads the input image data from the memory and then performs a resolution modulation process to generate the image data signal.
According to some embodiments of the present invention, the anti-peeping display device further includes a data driving circuit electrically connected to the timing control circuit and the display panel, the display panel having a display area and a peripheral area, the display panel including a plurality of pixels, the plurality of pixels being located in the display area, wherein after the step of generating the output image data by the timing control circuit, the output image data is transmitted to the data driving circuit, the data driving circuit generates an image driving signal according to the image data signal, and the image driving signal is transmitted to a portion of the plurality of pixels of the display panel, so as to display a picture on a portion of the display area of the display panel.
According to some embodiments of the present invention, the output image data further includes a privacy-protection data signal of a privacy-protection image, and the data driving circuit generates a privacy-protection driving signal according to the privacy-protection data signal and transmits the privacy-protection driving signal to another portion of the plurality of pixels of the display panel, so as to display the privacy-protection image on another portion of the display area of the display panel.
The invention has the advantages that the peep-proof function can be provided without using a peep-proof sheet, so that the hardware cost can be reduced, and the normal display mode and the peep-proof display mode can be switched by the drive setting, thereby improving the convenience in use.
Drawings
For a more complete understanding of the embodiments and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating a driving method for a display device according to an embodiment of the present invention;
FIG. 3A is a diagram illustrating an example of the display area of FIG. 1 displaying an image corresponding to first image data in a normal display mode;
fig. 3B to 3D are examples of displaying an image corresponding to the second image data in the privacy-preserving display mode in the display area of fig. 1, respectively.
Detailed Description
Embodiments of the present disclosure are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative and do not limit the scope of the disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the claims. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be understood that, although the terms first and second may be used herein to describe various elements, such elements should not be limited by such terms. Such terms are only used to distinguish one element from another.
The spatially relative terms are used to describe various orientations of the elements in use or operation and are not intended to be limited to the orientations shown in the figures. Elements may also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted in a similar manner.
Reference numerals and/or letters may be repeated among the various embodiments for simplicity and clarity of illustration, but are not intended to indicate a resulting relationship between the various embodiments and/or configurations discussed.
In addition, for the sake of simplicity, some common structures and elements in the art are shown in the drawings in a simple schematic manner or are not shown in the drawings, and the actual sizes and proportions of the elements in the drawings are not limited to the contents shown in the drawings.
Referring to fig. 1, fig. 1 is a schematic view of a display device 100 according to an embodiment of the invention. The display device 100 includes a display panel 110, a data driving circuit 120, a scan driving circuit 130, and a timing control circuit 140. The display panel 110 has a display area 110A and a peripheral area 110B, and the display area 110A is used for displaying an image and includes a plurality of pixels. The pixels in the display area 110A are driven by the data driving signal and the scan driving signal in common to display an image. The display panel 110 may be, for example, a Twisted Nematic (TN) type, an in-plane switching (IPS) type, an fringe-field switching (FFS) type, a Vertical Alignment (VA) type, or the like, or a light-emitting diode (led) type, such as an organic light-emitting diode (OLED) type, a micro-led (micro-emitting diode) type, or the like, but is not limited thereto. The data driving circuit 120 is electrically connected to the plurality of pixels of the display panel 110, and is configured to convert the output image data provided by the timing control circuit 140 into driving signals and transmit the driving signals to the plurality of pixels of the display panel 110. The scan driving circuit 130 is electrically connected to the pixels of the display panel 110, and is configured to generate a scan driving signal and transmit the scan driving signal to the pixels of the display panel 110. The timing control circuit 140 is electrically connected to the scan driving circuit 130, and provides signals related to scan driving to the scan driving circuit 130, so as to control the scan driving circuit 130 to sequentially drive each pixel row (row) in the display area 110A of the display panel 110. In addition, the timing control circuit 140 is electrically connected to the data driving circuit 120, and provides the output image data to the data driving circuit 120, so as to control the data driving circuit 120 to send corresponding driving signals to each pixel row (column) in the display area 110A of the display panel 110 when each pixel row is sequentially driven.
The timing control circuit 140 may transmit the corresponding output image data to the data driving circuit 120 according to the display mode of the display device 100. The display mode of the display device 100 can be set by a user according to the user's requirement. The display mode setting information can be stored in the memory 142 or other memories of the display device 100, but is not limited thereto.
In the present invention, the display mode of the display device 100 includes a normal display mode and a privacy display mode. Since the display device 100 has a peep-proof display function, the display device 100 may also be referred to as a peep-proof display device 100 herein. When a screen is to be displayed in a normal display mode (also referred to as a non-peep-proof display mode), the timing control circuit 140 receives input image data and generates output image data. The resolution (resolution) of the output image data is the same as the resolution of the input image data. The output image data includes an image data signal generated according to the input image data, and is transmitted to the data driving circuit 120. The data driving circuit 120 generates driving signals according to the output image data, and the driving signals include image driving signals generated according to the image data signals. The data driving circuit 120 converts the image data signal into an image driving signal, and transmits the image driving signal to a plurality of pixels of the display panel 110, so as to display an image corresponding to the image data signal in the display area 110A of the display panel 110. Herein, the image data signal and the image driving signal in the normal display mode may also be referred to as a first image data signal and a first image driving signal, respectively. In some embodiments, the resolution of the input image data is equal to the resolution of the display area 110A of the display panel 110, that is, the number of pixels disposed in the display area 110A of the display panel 110, but not limited thereto. In the normal display mode, the timing control circuit 140 does not perform resolution modulation processing on the input image data, so that the resolution of the output first image data signal is consistent with the resolution of the input image data. For example, if the resolution of the display area 110A of the display panel 110 is 1920 × 1080, the resolutions of the input video data, the output video data and the first video data signal are 1920 × 1080 in the normal display mode.
When a screen is to be displayed in the anti-peep display mode, the timing control circuit 140 receives the input image data and generates output image data, and the resolution of the output image data is the same as that of the input image data. The output image data includes an image data signal generated according to the input image data, and the output image signal is transmitted to the data driving circuit 120. The data driving circuit 120 generates driving signals according to the output image data, and the driving signals include image driving signals generated according to the image data signals. The data driving circuit 120 converts the image data signal into an image driving signal, and transmits the image driving signal to a portion of the plurality of pixels of the display panel 110, so as to display an image corresponding to the image data signal on a portion of the display area 110A of the display panel 110. Herein, the image data signal and the image driving signal in the privacy-enhanced display mode may also be referred to as a second image data signal and a second image driving signal, respectively. The timing control circuit 140 performs resolution modulation processing on the input image data to generate a corresponding second image data signal, so that the resolution of the output second image data signal is lower than that of the input image data.
In some embodiments, in the anti-peep display mode, the timing control circuit 140 further provides the anti-peep data signal to the data driving circuit 120, that is, the output image data generated by the timing control circuit 140 includes the anti-peep data signal in addition to the second image data signal, so that the driving signal generated by the data driving circuit 120 includes the anti-peep driving signal in addition to the image driving signal, so that in the display area 110A of the display panel 110, a part of the pixels display an image corresponding to the second image data signal, and another part of the pixels display an image corresponding to the anti-peep data signal (also referred to as an anti-peep image). The image corresponding to the peep-proof data signal may be a monochrome image such as a full black image, a full white image, a full gray image, or other color images, or may be a combined image of multiple colors such as a mosaic pattern, a stripe pattern, or a block pattern, but is not limited thereto. The image information contained in the image corresponding to the peep-proof data signal is not related to the image information of the second image data signal. For example, the pixels in the central region of the display area 110A may display the image corresponding to the second image data signal, and the pixels in the upper and lower portions and/or the left and right portions of the display area 110A may display the image corresponding to the anti-peeping data signal, so as to achieve the anti-peeping effect. The timing control circuit 140 may integrate the peep-proof data signal and the second image data signal into output image data and transmit the output image data to the data driving circuit 120, and the data driving circuit 120 converts the second image data signal and the peep-proof data signal into a second image driving signal and a peep-proof driving signal, respectively. The scan driving circuit 130 transmits the scan signal to each pixel row of the display region 110A, and the data driving circuit 120 integrates the second image driving signal and the anti-peep driving signal into a driving signal and transmits the driving signal to a plurality of pixels of the display panel 110, so that the central region and the peripheral region (i.e. the upper side, the lower side, the left side and/or the right side of the display region 110A) of the display region 110A respectively display an image corresponding to the second image data signal and an image corresponding to the anti-peep data signal. For example, if the resolution of the display area 110A of the display panel 110 is 1920 × 1080, the resolutions of the input video data and the output video data are both 1920 × 1080 and the resolution of the second video data signal can be 1440 × 1080, 1920 × 810 or 1440 × 810 in the privacy-enhanced display mode, but not limited thereto.
To sum up, in the normal display mode, the timing control circuit 140 receives the input image data and generates output image data, where the output image data includes a first image data signal, the resolution of the first image data signal is the same as the resolution of the input image data, the data driving circuit 120 converts the first image data signal into a first image driving signal, and transmits the first image driving signal to K pixels of the display panel 110 to display an image corresponding to the first image data signal, where K is a positive integer greater than 0. In the anti-peep display mode, the timing control circuit 140 receives input image data and generates output image data, the output image data includes a second image data signal, the resolution of the second image data signal is smaller than that of the input image data, the data driving circuit 120 converts the second image data signal into a second image driving signal, and transmits the second image driving signal to L pixels of the display panel 110 to display a picture corresponding to the second image data signal, wherein L is a positive integer greater than 0. Since the resolution of the second video data signal is lower than that of the input video data and the resolution of the first video data signal is the same as that of the input video data, the resolution of the second video data signal is lower than that of the first video data signal, i.e., L is smaller than K. For example, in the normal display mode, the entire area of the display area 110A is used for displaying the image corresponding to the first image data signal; in the anti-peep display mode, a part of the display region 110A is used for displaying an image corresponding to the second image data signal. In addition, in the anti-peep display mode, the output image data generated after the timing control circuit 140 receives the input image data may include an anti-peep data signal in addition to the second image data signal, and the data driving circuit 120 converts the second image data signal and the anti-peep data signal into a second image driving signal and an anti-peep driving signal, respectively, and transmits the second image driving signal and the anti-peep driving signal to the L pixels and the (K-L) pixels of the display panel 110, respectively, so that one portion and the other portion of the display area 110A, which are not overlapped with each other, display an image corresponding to the second image data signal and an image corresponding to the anti-peep data signal, respectively.
The memory 142 may be included in the timing control circuit 140 and configured to store the input image data in the privacy-protected display mode and be accessed by the timing control circuit 140 to perform the resolution modulation process on the input image data to generate the second image data signal with smaller resolution. In other embodiments, the memory 142 may be physically disposed outside the timing control circuit 140.
The display device 100 of the present invention may be a System On Glass (SOG) panel, that is, the scan driving circuit 130 is formed in the peripheral region 110B of the display panel 110. Therefore, the electronic devices in the display panel 110 and the scan driving circuit 130 can be simultaneously manufactured by using the same process. For example, the tfts in the scan driver circuit 130 can be fabricated simultaneously with the tfts in the display panel 110 in the display area 110A by the same process. In some embodiments, the data driving circuit 120 and/or the timing control circuit 140 may also be fabricated in the display panel 110, and the electronic elements and/or wirings in the display panel 110, the data driving circuit 120, the scan driving circuit 130 and the timing control circuit 140 may be fabricated simultaneously by using the same process. Alternatively, in some embodiments, the data driving circuit 120, the scan driving circuit 130 and the timing control circuit 140 may be fabricated as at least one chip, and the at least one chip is electrically connected to the display panel 110. For example, the data driving circuit 120, the scan driving circuit 130 and the timing control circuit 140 may be integrated into a single Display Driver IC (DDI), but not limited thereto.
Fig. 2 is a flowchart illustrating a driving method 200 for a display device according to an embodiment of the invention. The driving method 200 may be applied to various display devices, such as the display device 100 of fig. 1 or other types of display devices. In addition, the driving method 200 may be performed by a timing control circuit or other driving circuits of the display device.
In operation S210, the display apparatus 100 determines whether to perform the normal display mode or the privacy display mode. For example, the user may next instruct the display device 100 to enter the privacy-protection display mode, or next instruct the display device 100 to enter or resume the normal display mode. The present invention is not limited to the manner in which the user issues the instructions. For example, the command can be input by a keyboard, or by clicking a screen with a mouse, or by voice, but not limited thereto.
In operation S220, when the display mode of the display device is the normal display mode, the timing control circuit 140 receives the input image data and generates a first image data signal according to the input image data, wherein a resolution of the first image data signal is equal to a resolution of the input image data. The data driving circuit 120 receives the first image data signal, converts the first image data signal into a first image driving signal, and transmits the first image driving signal to a plurality of pixels of the display panel 110. For example, if the resolution of the input image data is equal to the resolution of the display area 110A of the display panel 110, in the normal display mode, the resolution modulation processing is not performed on the input image data, so that the resolution of the first image data signal generated by the timing control circuit 140 is equal to the resolution of the display area 110A of the display panel 110.
In operation S230, when the display mode of the display device is the privacy-protection display mode, the timing control circuit 140 receives the input image data and performs a resolution modulation process according to the input image data to generate a second image data signal, wherein the resolution of the second image data signal is lower than the resolution of the input image data. The data driving circuit 120 receives the second image data signal, converts the second image data signal into a second image driving signal, and transmits the second image driving signal to a portion of the plurality of pixels of the display panel 110. For example, if the resolution of the input image data is equal to the resolution of the display area 110A of the display panel 110, in the privacy-enhanced display mode, the resolution modulation processing may be performed on the input image data, so that the resolution of the generated second image data signal is lower than the resolution of the display area 110A of the display panel 110, that is, the row resolution of the second image data signal is lower than the number of pixel rows of the display area 110A of the display panel 110, and/or the row resolution of the second image data signal is lower than the number of pixel rows of the display area 110A of the display panel 110.
In some embodiments, when the display mode of the display device is the privacy-protection display mode, the timing control circuit 140 may further generate a privacy-protection data signal in addition to the second image data signal in operation S230. The data driving circuit 120 receives the peep-proof data signal, converts the peep-proof data signal into a peep-proof driving signal, and transmits the peep-proof driving signal to another portion of the plurality of pixels of the display panel 110, so that in the display panel, one portion of the pixels display an image corresponding to the second image data signal, and the other portion of the pixels display an image corresponding to the peep-proof data signal. The image corresponding to the peep-proof data signal can refer to the description of the peep-proof image, and is not described herein again.
The timing control circuit 140 performs a resolution modulation process on the input image data, such as a scaling process in the left-right and/or up-down directions, to generate a second image data signal. For example, when two identical input image data are respectively transmitted to the timing control circuit 140 in the normal display mode and the timing control circuit 140 in the peep-proof display mode, the timing control circuit 140 in the normal display mode generates a first image data signal according to the input image data, and the timing control circuit 140 in the peep-proof display mode performs resolution modulation processing according to the input image data to generate a second image data signal, the corresponding image content displayed by the second image data signal on the display panel 110 is the same as the corresponding image content displayed by the first image data signal on the display panel 110, but the size of the corresponding image content displayed by the second image data signal on the display panel 110 is different from the size of the corresponding image content displayed by the first image data signal on the display panel 110. For example, when the input video data is to display the string ABCD on the display panel 110, the corresponding video content displayed on the display panel 110 by the second video data signal and the corresponding video content displayed on the display panel 110 by the first video data signal are both the string ABCD, but the size of the string ABCD displayed on the display panel 110 by the second video data signal is different from the size of the string ABCD displayed on the display panel 110 by the first video data signal. In some embodiments, when the same two input image data are respectively transmitted to the timing control circuit 140 in the normal display mode and the timing control circuit 140 in the privacy-enhanced display mode, the length scaling and the width scaling of the corresponding image displayed on the display panel 110 by the second image data signal are the same as the length scaling and the width scaling of the corresponding image displayed on the display panel 110 by the first image data signal. In this way, the object image in the image displayed according to the second image data signal is similar to the object image in the image displayed according to the first image data signal, so that the object image is not affected by widening or narrowing or stretching or shortening in visual sense. For example, if the resolution of the first image data signal is 1920 × 1080, the resolution of the second image data signal may be 1440 × 810, i.e., the ratio of the column resolution to the row resolution of the second image data signal relative to the first image data signal is 75%. However, the length scaling and the width scaling of the corresponding image displayed on the display panel 110 by the second image data signal of the present invention relative to the corresponding image displayed on the display panel 110 by the first image data signal are not limited to the above.
Fig. 3A to 3D are examples of displaying corresponding image data in different display modes, respectively. In fig. 3A to 3D, when a picture is to be displayed in the display area 110A of the display panel 110, the timing control circuit 140 receives input image data with a resolution of M × N, where M and N are positive integers greater than 0. In fig. 3A to 3D, M and N are illustrated as 1920 and 1080, respectively, but the numerical values of M and N are not limited thereto. The timing control circuit 140 generates output image data with a resolution of M × N and transmits the output image data to the data driving circuit 120, and the data driving circuit 120 generates a driving signal according to the output image data and transmits the driving signal to the display panel 110 to display a picture corresponding to the output image data in the display area 110A of the display panel 110. The output image data includes image data signals with a resolution of I × J, I and J are positive integers greater than 0, I is less than or equal to M, J is less than or equal to N, and the image data signals are generated according to the input image data signals and correspond to each other. The driving signals include image driving signals, and the image driving signals are generated according to the image data signals and correspond to each other.
Fig. 3A is an example of the display area 110A of the display panel 110 displaying the image 302A corresponding to the first image data in the normal display mode. When the display mode of the display device is the normal display mode, the timing control circuit 140 generates the output image data including an image data signal (also called a first image data signal) with a resolution of I × J, I equals to M, and J equals to N, i.e. the resolution of the first image data signal in the output image data equals to the resolution of the input image data. The display area 110A of the display panel 110 displays an image 302A corresponding to the first image data signal. As shown in FIG. 3A, since the resolution of the image 302A is equal to the number of pixels in the display area 110A, the entire area of the display area 110A is used for displaying the image 302A.
Fig. 3B to 3D are examples of images 302B to 302D corresponding to the second image data displayed on the display area 110A of the display panel 110 in the privacy-enhanced display mode, respectively. In the privacy-protected display mode, the timing control circuit 140 receives input image data with a resolution of M × N and outputs output image data with a resolution of M × N to the data driving circuit 120, where the output image data includes an image data signal with a resolution of I × J (also referred to as a second image data signal), and the resolution of the second image data signal is lower than that of the input image data, that is, the resolution of the second image data signal is lower than that of the first image data signal. The resolution of the second image data signal compared with the resolution of the first image data signal (or the input image data) can have the following three aspects: first, the row resolution of the second image data signal is lower than the row resolution of the first image data signal (or the input image data), and the row resolution of the second image data signal is equal to the row resolution of the first image data signal (or the input image data), I is less than M, and J is equal to N; second, the row resolution of the second image data signal is equal to the row resolution of the first image data signal (or the input image data), and the row resolution of the second image data signal is lower than the row resolution of the first image data signal (or the input image data), i.e. I is equal to M, and J is less than N; third, the line resolution and the row resolution of the second image data signal are lower than the line resolution and the row resolution of the first image data signal (or the input image data), i.e., I is less than M and J is less than N. For example, if the resolution of the first video data signal (or the input video data) is 1920 × 1080, the resolutions of the second video data signal corresponding to the three modes may be 1440 × 1080, 1920 × 810 and 1440 × 810, but the resolutions of the second video data signal corresponding to the three modes are not limited thereto. The three modes can also be respectively referred to as a first peep-proof display mode, a second peep-proof display mode and a third peep-proof display mode. Fig. 3B to 3D correspond to the first to third peep-proof display modes, respectively.
In addition, in the privacy-enhanced display mode, only a portion of the pixels of the display panel 110 display images corresponding to the second image data signals. For example, if the number of pixels in the display area 110A of the display panel 110 is 1920 × 1080 and the resolution of the second video data signal is 1440 × 810, only 1440 × 810 pixels of the 1920 × 1080 pixels in the display area 110A of the display panel 110 are used for displaying the image corresponding to the second video data signal.
In fig. 3B, since the second image data signal has a lower column resolution than the number of pixel columns in the display area 110A, only a portion of the pixel columns in the display area 110A are configured to display the image 302B corresponding to the second image data signal. In fig. 3C, since the line resolution of the second image data signal is lower than the number of pixel lines in the display area 110A, only a portion of the pixel lines in the display area 110A are configured to display the image 302C corresponding to the second image data signal. In fig. 3D, since the row resolution and the column resolution of the second image data signal are lower than the number of pixel rows and the number of pixel columns of the display area 110A, respectively, only a portion of the pixel rows and a portion of the pixel columns in the display area 110A are configured to display the image 302D corresponding to the second image data signal. For example, when the same screen content is displayed in the normal display mode, the first privacy display mode, the second privacy display mode, and the third privacy display mode, the content of any one of the images 302B to 302D corresponding to the second image data is the same as the content of the image 302A corresponding to the first image data, but the size of any one of the images 302B to 302D corresponding to the second image data is different from the size of the image 302A corresponding to the first image data.
In addition, in the peep-proof display mode, the timing control circuit 140 may further provide the peep-proof data signal to the display panel 110, that is, the output image data with the resolution of M × N generated by the timing control circuit 140 includes the peep-proof data signal in addition to the second image data signal with the resolution of I × J, and an image corresponding to the peep-proof data signal and an image corresponding to the second image data signal are displayed by different pixels of the display panel 110. In addition, the image information of the peep-proof data signal may not be related to the image information of the second image data signal.
Reference is again made to the examples of fig. 3B to 3D. In fig. 3B, since the pixel rows on the left and right sides of the display area 110A are not used for displaying the image 302B corresponding to the second image data signal, the timing control circuit 140 may additionally generate the peep-proof data signal, and integrate the peep-proof data signal and the second image data signal with the resolution of I × J into the output image data with the resolution of M × N and transmit the output image data to the data driving circuit 120. The data driving circuit 120 generates a corresponding image driving signal and a corresponding anti-peeping driving signal according to the second image data signal and the anti-peeping data signal, respectively, and integrates the image driving signal and the anti-peeping driving signal into a driving signal and transmits the driving signal to the display panel 110. By transmitting the scan signal to each pixel row of the display region 110A through the scan driving circuit, the pixel rows on the left and right sides of the display region 110A are used to display the image 304B corresponding to the anti-peep data signal, and the other pixel rows of the display region 110A are used to display the image 302B corresponding to the second image data signal. In fig. 3B, M, N, I, J are shown as 1920, 1080, 1440, and 1080, respectively, but the value of M, N, I, J is not limited thereto. In fig. 3C, since the pixel rows on the upper and lower sides of the display region 110A are not used for displaying the image 302C corresponding to the second image data signal, the timing control circuit 140 may additionally generate the peep-prevention data signal, and integrate the peep-prevention data signal and the second image data signal with the resolution of I × J into the output image data with the resolution of M × N and transmit the output image data to the data driving circuit 120. The data driving circuit 120 generates a corresponding image driving signal and a corresponding anti-peeping driving signal according to the second image data signal and the anti-peeping data signal, respectively, and integrates the image driving signal and the anti-peeping driving signal into a driving signal and transmits the driving signal to the display panel 110. The scan driving circuit transmits a scan signal to each pixel row of the display area 110A, so that the pixel rows on the upper and lower sides of the display area 110A are used for displaying an image 304C corresponding to the anti-peep data signal, and the other pixel rows of the display area 110A are used for displaying an image 302C corresponding to the second image data signal. In fig. 3C, M, N, I, J are exemplified by 1920, 1080, 1920, 810, respectively, but the value of M, N, I, J is not limited thereto. In fig. 3D, since the pixel rows on the left and right sides and the pixel columns on the upper and lower sides of the display region 110A are not used for displaying the image 302D corresponding to the second image data signal, the timing control circuit 140 may additionally generate the peep-proof data signal, and integrate the peep-proof data signal and the second image data signal with the resolution of I × J into the output image data with the resolution of M × N, and transmit the output image data to the data driving circuit 120. The data driving circuit 120 generates a corresponding image driving signal and a corresponding anti-peep driving signal according to the second image data signal and the anti-peep data signal, respectively, and integrates the image driving signal and the anti-peep driving signal into a driving signal to be transmitted to the display panel 110. The scan driving circuit 130 transmits a scan signal to each pixel row of the display region 110A, such that the pixel rows on the left and right sides and the pixel rows on the upper and lower sides of the display region 110A are used for displaying the image 304D corresponding to the anti-peep data signal, and the other pixels of the display region 110A are used for displaying the image 302D corresponding to the second image data signal. In fig. 3D, M, N, I, J are shown as 1920, 1080, 1440 and 810, respectively, but the value of M, N, I, J is not limited thereto.
In fig. 3B to 3D, the images 304B to 304D can refer to the description of the above-mentioned peep-proof image, and are not described herein again.
When the display mode of the display device is the peep-proof display mode, the timing control circuit 140 may perform resolution modulation processing on the input image data to generate second image data signals with different resolutions. For example, the timing control circuit 140 may include a resolution modulation processing unit, the input image data received by the timing control circuit 140 may be temporarily stored in the memory 142, and then the timing control circuit 140 reads the input image data from the memory 142 and performs the resolution modulation processing by the resolution modulation processing unit to generate the second image data signal. In addition, the timing control circuit 140 generates a privacy-protection data signal and transmits output image data including the second image data signal and the privacy-protection data signal to the data driving circuit 120.
The resolution of the input image data received by the timing control circuit 140 is the same as the resolution of the output image data generated by the timing control circuit 140. When the display mode of the display device is a normal display mode, the resolution of the input image data is equal to the resolution of the first image data signal in the output image data. However, in the anti-peeping display mode, the resolution of the input image data is greater than the resolution of the second image data signal in the output image data, that is, the range of the picture to be displayed is reduced, and the anti-peeping image is filled around the picture to be displayed, so as to achieve the anti-peeping effect.
It should be noted that the resolution values corresponding to various aspects of the second image data signal are merely examples, and are not intended to limit the scope of the present invention. In addition, the pixel range and/or the position, etc. of the display area for displaying the image corresponding to the second image data signal and the image corresponding to the peep-proof data signal can be correspondingly adjusted according to the actual use requirement, and is not limited by the above description and the accompanying examples.
As can be seen from the above description, the present invention can omit the use of the peep-proof sheet, so that the hardware cost can be reduced while providing the peep-proof function, and the normal display mode and the peep-proof display mode can be switched by the driving setting, thereby increasing the convenience in use.
While the present disclosure has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, and therefore the scope of the present disclosure should be limited only by the terms of the appended claims.

Claims (11)

1. A driving method of a privacy display device, the privacy display device comprising a display panel, the driving method comprising:
when the peep-proof display device displays a picture on the display panel in the peep-proof display mode,
receiving input image data of the picture; and
generating output image data, wherein the output image data comprises an image data signal, the image data signal is generated according to the input image data, and the resolution of the image data signal is smaller than that of the input image data.
2. The driving method according to claim 1, wherein the display panel has a display area and a peripheral area, the output image data further includes a privacy-protection data signal of a privacy-protection image, and the privacy-protection display device simultaneously displays the frame and the privacy-protection image in the display area of the display panel.
3. The driving method according to claim 2, wherein the display panel includes a plurality of pixels located in the display region, and the driving method further includes:
generating an image driving signal according to the image data signal;
generating a peep-proof driving signal according to the peep-proof data signal;
transmitting the image driving signal to a part of the plurality of pixels of the display panel to display the picture on a part of the display area of the display panel; and
and transmitting the peep-proof driving signal to another part of the plurality of pixels of the display panel so as to display the peep-proof image on another part of the display area of the display panel.
4. The driving method according to claim 1, further comprising:
when the peep-proof display device displays another picture on the display panel in the normal display mode,
receiving another input image data of another picture; and
generating another output image data, wherein the another output image data comprises another image data signal, wherein the another image data signal is generated according to the another input image data, and the resolution of the another image data signal is equal to the resolution of the another input image data.
5. The driving method according to claim 1, wherein the resolution of the input image data is M × N, the resolution of the image data signal is I × J, wherein M, N, I, J is a positive integer greater than 0, I is less than M, and J is equal to N.
6. The driving method according to claim 1, wherein the resolution of the input image data is M × N, the resolution of the image data signal is I × J, wherein M, N, I, J is a positive integer greater than 0, I is equal to M, and J is less than N.
7. The driving method according to claim 1, wherein the resolution of the input image data is M × N, the resolution of the image data signal is I × J, and M, N, I, J is a positive integer greater than 0, I is less than M, and J is less than N.
8. A privacy display device, comprising:
a time sequence control circuit and a display panel;
wherein when the anti-peeping display device displays a picture on the display panel in the anti-peeping display mode,
the time sequence control circuit receives input image data of the picture; and
the timing control circuit generates output image data, wherein the output image data comprises an image data signal, the image data signal is generated according to the input image data, and the resolution of the image data signal is smaller than that of the input image data.
9. The privacy display device of claim 8, further comprising a memory, wherein in the step of generating the output image data by the timing control circuit, the input image data is stored in the memory, and the timing control circuit reads the input image data from the memory and then performs a resolution modulation process to generate the image data signal.
10. The privacy display device of claim 8, further comprising a data driving circuit electrically connected to the timing control circuit and the display panel, wherein the display panel has a display area and a peripheral area, the display panel comprises a plurality of pixels, and the plurality of pixels are located in the display area, wherein after the step of generating the output image data by the timing control circuit, the output image data is transmitted to the data driving circuit, and the data driving circuit generates an image driving signal according to the image data signal and transmits the image driving signal to a portion of the plurality of pixels of the display panel, so as to display the image on the portion of the display area of the display panel.
11. The privacy-preserving display device according to claim 10, wherein the output image data further comprises a privacy-preserving data signal of a privacy-preserving image, and the data driving circuit generates a privacy-preserving driving signal according to the privacy-preserving data signal and transmits the privacy-preserving driving signal to another portion of the plurality of pixels of the display panel to display the privacy-preserving image on another portion of the display area of the display panel.
CN202110678299.6A 2021-06-18 2021-06-18 Driving method of peep-proof display device and peep-proof display device Pending CN115497407A (en)

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