CN115248511B - Display device - Google Patents

Display device Download PDF

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Publication number
CN115248511B
CN115248511B CN202110466678.9A CN202110466678A CN115248511B CN 115248511 B CN115248511 B CN 115248511B CN 202110466678 A CN202110466678 A CN 202110466678A CN 115248511 B CN115248511 B CN 115248511B
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China
Prior art keywords
display area
voltage level
display
pixel electrodes
liquid crystal
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Active
Application number
CN202110466678.9A
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Chinese (zh)
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CN115248511A (en
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 CN202110466678.9A priority Critical patent/CN115248511B/en
Publication of CN115248511A publication Critical patent/CN115248511A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • 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

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a display device, which comprises a first display area, a second display area, a liquid crystal layer, a plurality of pixel electrodes and a driving circuit. The liquid crystal layer has a plurality of first portions overlapping the first display region and a plurality of second portions overlapping the second display region. The pixel electrodes include a plurality of first pixel electrodes and a plurality of second pixel electrodes. The first pixel electrodes are used for driving the first parts. The second pixel electrodes are used for driving the second parts. The driving circuit is suitable for receiving the first trigger signals, providing a plurality of first driving signals to the first pixel electrodes and providing a plurality of second driving signals to the second pixel electrodes. When the display device is operated in the first peep-proof mode according to the first trigger signal, the first visual angle range of the first display area is different from the second visual angle range of the second display area, and the maximum voltage level of the first driving signals is different from the maximum voltage level of the second driving signals.

Description

Display device
Technical Field
The present disclosure relates to display devices, and particularly to a display device with peep-proof function.
Background
Generally, a display device has a display design with a wide viewing angle in order to share a display image for multiple users to watch together. However, in some use situations, such as browsing private web pages, confidential information, or entering passwords in public places, the wide-angle display feature tends to allow more private information the opportunity for bystanders to peep. In order to achieve the peep-proof effect, it is common practice to place a light control film (light control film, LCF) in front of the display panel to filter out light at large angles. Conversely, when there is no privacy requirement, the light control film still needs to be manually removed from the front of the display panel. In other words, although such a light control film has a peep-proof effect, the convenience of operation thereof still leaves room for improvement. Therefore, developing a display device with very convenient viewing angle switching and excellent anti-peeping effect is still an important issue for related manufacturers.
Disclosure of Invention
The invention is directed to a display device, which has convenient switching of peep-proof function and cost advantage.
According to an embodiment of the invention, a display device includes a first display region, a second display region, a liquid crystal layer, a plurality of pixel electrodes, and a driving circuit. The first display area has a first visual angle range. The second display area is arranged on a first side of the first display area in the first direction and has a second visual angle range. The liquid crystal layer has a plurality of first portions overlapping the first display region and a plurality of second portions overlapping the second display region. The pixel electrodes are overlapped and arranged on the liquid crystal layer and comprise a plurality of first pixel electrodes and a plurality of second pixel electrodes. The first pixel electrodes are used for driving the first parts of the liquid crystal layer. The second pixel electrodes are used for driving the second parts of the liquid crystal layer. The driving circuit provides a plurality of first driving signals to the first pixel electrodes and a plurality of second driving signals to the second pixel electrodes. When the display device is operated in the peep-proof mode, the first visual angle range of the first display area is different from the second visual angle range of the second display area, and the maximum voltage level of the first driving signals is different from the maximum voltage level of the second driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the peep-proof mode, the first visual angle range of the first display area is larger than the second visual angle range of the second display area, and the maximum voltage level of the plurality of second driving signals is smaller than the maximum voltage level of the plurality of first driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the non-peeping mode, the first viewing angle range of the first display area is equal to the second viewing angle range of the second display area, and the maximum voltage level of the plurality of first driving signals is equal to the maximum voltage level of the plurality of second driving signals.
In the display device according to the embodiment of the invention, the display device further includes a third display area disposed at the second side of the first display area and having a third viewing angle range. The first side and the second side are opposite sides of the first display area in the first direction. The liquid crystal layer also has a plurality of third portions overlapping the third display area. The plurality of pixel electrodes further includes a plurality of third pixel electrodes to drive a plurality of third portions of the liquid crystal layer. The driving circuit also provides a plurality of third driving signals to the third pixel electrodes. When the display device is operated in the peep-proof mode, the third visual angle range of the third display area is different from the first visual angle range of the first display area, and the maximum voltage level of the plurality of third driving signals is different from the maximum voltage level of the plurality of first driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the peep-proof mode, the first viewing angle range of the first display area is larger than the second viewing angle range of the second display area and the third viewing angle range of the third display area, and the maximum voltage level of the plurality of second driving signals and the maximum voltage level of the plurality of third driving signals are smaller than the maximum voltage level of the plurality of first driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the non-peep-preventing mode, the first viewing angle range of the first display area, the second viewing angle range of the second display area, and the third viewing angle range of the third display area are identical to each other, and the maximum voltage levels of the plurality of first driving signals, the maximum voltage levels of the plurality of second driving signals, and the maximum voltage levels of the plurality of third driving signals are identical to each other.
In the display device according to the embodiment of the invention, the display device further includes a fourth display area disposed at a third side of the first display area in the second direction and having a fourth viewing angle range. The second direction intersects the first direction. The liquid crystal layer also has a plurality of fourth portions overlapping the fourth display region. The plurality of pixel electrodes further includes a plurality of fourth pixel electrodes to drive a plurality of fourth portions of the liquid crystal layer. The driving circuit also provides a plurality of fourth driving signals to the fourth pixel electrodes. When the display device is operated in the other peep-proof mode, the fourth visual angle range of the fourth display area is different from the first visual angle range of the first display area. The maximum voltage level of the plurality of fourth driving signals is different from the maximum voltage level of the plurality of first driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the other peep-proof mode, the first viewing angle range of the first display area is larger than the fourth viewing angle range of the fourth display area, and the maximum voltage level of the plurality of fourth driving signals is smaller than the maximum voltage level of the plurality of first driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the other peep-preventing mode, the first viewing angle range of the first display area is larger than the fourth viewing angle range of the fourth display area, the first viewing angle range of the first display area is equal to the second viewing angle range of the second display area, the maximum voltage level of the plurality of fourth driving signals is smaller than the maximum voltage level of the plurality of first driving signals, and the maximum voltage level of the plurality of first driving signals is equal to the maximum voltage level of the plurality of second driving signals.
In the display device according to the embodiment of the invention, when the display device is operated in the other peep-preventing mode, the first viewing angle range of the first display area is larger than the second viewing angle range of the second display area and the fourth viewing angle range of the fourth display area, and the maximum voltage level of the plurality of second driving signals and the maximum voltage level of the plurality of fourth driving signals are smaller than the maximum voltage level of the plurality of first driving signals.
Based on the above, in the display device according to an embodiment of the present invention, when the display device is operated in the peep-proof mode, the maximum voltage level of the first driving signal supplied to the first pixel electrode by the driving circuit is different from the maximum voltage level of the second driving signal supplied to the second pixel electrode. Therefore, the visual angle range of the first display area of the display device is different from that of the second display area, and the operation elasticity and convenience of peep-proof display are improved. Because the pixel structure designs of the two display areas (such as the peep-proof display area and the normal display area) are the same, the peep-proof display effect can be achieved without arranging an additional optical film or an electric control liquid crystal box. Therefore, the display device of the invention has cost advantages although having peep-proof function.
Drawings
Fig. 1 is a schematic top view of a display device according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display panel of FIG. 1;
fig. 3A to 3C are schematic side views of the viewing angle range of the display panel of fig. 1 when operated in the peep-proof mode;
FIG. 4 is a schematic side view of the viewing angle range of the display panel of FIG. 1 when operated in a non-privacy mode;
fig. 5 is a schematic top view of a display device according to a second embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of the display panel of FIG. 5;
fig. 7A to 7C are schematic side views of the viewing angle range of the display panel of fig. 5 when operated in the peep-proof mode;
fig. 8 is a schematic top view of a display device according to a third embodiment of the present invention;
fig. 9A and 9B are schematic cross-sectional views of the display panel of fig. 8;
fig. 10A and 10B are side views of the viewing angle range of the display panel of fig. 8 when operated in the peep-proof mode.
Description of the reference numerals
10. 10A, 20: a display device;
100. 100A, 100B: a display panel;
110: a pixel array substrate;
130: an opposite substrate;
150. 150A, 150B: a liquid crystal layer;
151. 152, 153, 151A, 152A, 153A, 151B, 152B, 153B, 154B, 155B: a portion;
200. 200A: a driving circuit;
DA1, DA2, DA3, DA1A, DA2A, DA3A, DA1B, DA2B, DA3B, DA4B, DA5B: a display area;
DS1, DS2, DS3, DS1A, DS2A, DS3A, DS1B, DS2B, DS3B, DS4B, DS5B: a driving signal;
PE1, PE2, PE3, PE4, PE5: a pixel electrode;
TP, TP1, TP2: triggering the pin position;
TS, TS1, TS2: a trigger signal;
VR1x, VR2x, VR3x, VR1x ', VR2x', VR3x ', VR2x ", VR3x", VR1y, VR2y, VR3y, VR1y', VR2y ', VR3y', VR4y, VR5y: a viewing angle range;
X, Y, Z: direction.
Detailed Description
The foregoing and other technical aspects, features and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment, which proceeds with reference to the accompanying drawings. Directional terms mentioned in the following embodiments, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention. Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a schematic top view of a display device according to a first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of the display panel of fig. 1. Fig. 3A to 3C are schematic side views of the viewing angle range of the display panel of fig. 1 when operated in the peep-proof mode. Fig. 4 is a side view of the viewing angle range of the display panel of fig. 1 when operated in a non-privacy mode. For clarity of presentation, the display panel 100 of fig. 1 only shows the pixel array substrate 110 and the plurality of pixel electrodes PE1 to PE3 of fig. 2.
Referring to fig. 1 and 2, the display device 10 includes a display panel 100 and a driving circuit 200. For example, the driving chip including the driving circuit 200 may be disposed on a flexible circuit board, and electrically coupled to the display panel 100 through a bonding relationship between the flexible circuit board and the display panel 100, wherein the driving chip and the flexible circuit board are, for example, chip On Film (COF). However, the present invention is not limited thereto, and according to other embodiments, the driving chip including the driving circuit 200 may be disposed on the glass substrate of the pixel array substrate 110 by a Chip On Glass (COG) technology, or the driving circuit 200 may be fabricated on the glass substrate of the pixel array substrate 110.
In the present embodiment, the display surface of the display panel 100 is divided into a display area DA1, a display area DA2 and a display area DA3, and these display areas are arranged along the horizontal direction (e.g. direction X) of fig. 1. For example, the display area DA1 of the present embodiment can be used as a normal display area of the display device 10, and the display areas DA2 and DA3 located at two opposite sides (i.e. the first side and the second side along the direction X) of the display area DA1 can be used as peep-proof display areas of the display device 10, but not limited thereto. In other embodiments, the number and placement of the privacy display areas may be adjusted depending on the actual product application.
The display panel 100 may include a pixel array substrate 110, an opposite substrate 130, and a liquid crystal layer 150, wherein the liquid crystal layer 150 is sandwiched between the pixel array substrate 110 and the opposite substrate 130. In the present embodiment, the opposite substrate 130 is, for example, a substrate provided with a color filter layer, but not limited thereto. In other embodiments, the color filter layer may also be disposed on the pixel array substrate 110.
In this embodiment, the pixel array substrate 110 includes a substrate and a plurality of display pixels disposed on the substrate, and the display pixels include a plurality of pixel electrodes. The pixel electrodes are overlapped with the liquid crystal layer 150 in the direction Z (i.e., the direction perpendicular to the substrate of the pixel array substrate 110), and are arranged in a plurality of columns and a plurality of rows along the direction X and the direction Y, respectively. For example, the display pixels further have a plurality of active devices (not shown), and the pixel electrodes are electrically coupled to a corresponding data line (not shown) and a corresponding scan line (not shown) respectively through the active devices. Therefore, the display device 10 can control the voltage levels of the pixel electrodes through a plurality of data lines and a plurality of scanning lines to achieve the display effect of different image gray scales.
The pixel electrodes, which are connected to the above, include, for example: a plurality of pixel electrodes PE1 located in the display area DA1, a plurality of pixel electrodes PE2 located in the display area DA2, and a plurality of pixel electrodes PE3 located in the display area DA3. The liquid crystal layer 150 has a first portion 151, a second portion 152, and a third portion 153, and the three portions 151 to 153 overlap the display area DA1, the display area DA2, and the display area DA3, respectively, in the direction Z. The pixel electrodes PE1 are used to drive the first portion 151 of the liquid crystal layer 150. The pixel electrodes PE2 are used to drive the second portion 152 of the liquid crystal layer 150. The pixel electrodes PE3 are used to drive the third portion 153 of the liquid crystal layer 150.
For example, in the present embodiment, the operation mode of the display panel 100 may be a lateral electric field (transverse electrical field) mode, such as a fringe-field switching (FFS) mode or an in-plane switching (IPS) mode, or a vertical electric field (vertical electrical field) mode, such as a Twisted Nematic (TN) mode, but not limited thereto. In other embodiments, the operation mode of the display panel 100 may also be an electrically controlled birefringence (electrically controlled birefringence, ECB) mode, an optically compensated bend (optically compensated birefringence, OCB) mode, or a vertical alignment (vertical alignment, VA) mode. That is, the electrode structure of the pixel electrode can be adjusted according to the liquid crystal mode actually used, and the present invention is not limited thereto.
In order to make the respective viewing angle ranges of the display area DA2 and the display area DA3 different from the viewing angle range of the display area DA1, the voltage levels set by the pixel electrode PE2 and the pixel electrode PE3 at the respective display gray levels are different from the voltage level set by the pixel electrode PE 1. Alternatively, when the display panel 100 is operated in the peep-proof mode, the maximum voltage level of the enable pixel electrode PE2 and the maximum voltage level of the enable pixel electrode PE3 are different from the maximum voltage level of the enable pixel electrode PE 1. The above-mentioned difference in the arrangement of the voltage levels can enable the liquid crystal molecules of the liquid crystal layer 150 in the normal display area and the liquid crystal molecules in the peep-proof display area to rotate in different degrees, thereby generating different visual angle ranges. In this embodiment, when the display panel 100 is operated in the peep-proof mode, the range of the liquid crystal voltage (e.g. the absolute value of the difference between the voltage level of the pixel electrode and the voltage level of the corresponding common electrode) of the first portion 151 of the liquid crystal layer 150 in the normal display area DA1 may be 0-X volts and divided into M gray scales, X is greater than 0, M is a positive integer greater than 0, and the range of the liquid crystal voltages of the second portion 152 of the liquid crystal layer 150 in the peep-proof display area DA2 and the third portion 153 of the liquid crystal layer 150 in the peep-proof display area DA3 may be both 0-Y volts and also divided into M gray scales, Y is greater than 0, and Y is less than X, such that the viewing angle range of the normal display area DA1 is greater than the viewing angle ranges of the peep-proof display area DA2 and the peep-proof display area DA 3. In the present embodiment, Y may be 50% -90% of X, and preferably Y may be 60% -80% of X, so that when the user views the display panel 100 in the peep-proof mode, the user can clearly see the picture displayed on the display panel 100, and the other person can be prevented from seeing the picture displayed on the display panel 100 from the side of the display panel 100, but the ratio of X to Y is not limited thereto. For example, when the display panel 100 is operated in the peep-proof mode, the range of the liquid crystal voltage of the first portion 151 of the liquid crystal layer 150 may be 0-13 volts and divided into 256 gray scales, that is, X is 13 and M is 256, such that the viewing angles of the upper, lower, left and right sides of the display area DA1 are each 85 degrees, and the range of the liquid crystal voltage of the second portion 152 and the third portion 153 of the liquid crystal layer 150 may be 0-9 volts and divided into 256 gray scales, that is, Y is 9, such that the viewing angles of the upper, lower, left and right sides of the display area DA2 and the display area DA3 are each 60 degrees.
In the present embodiment, the driving circuit 200 has a trigger pin TP. The driving circuit 200 receives a trigger signal TS via the trigger pin TP, and generates a plurality of driving signals for driving a plurality of pixel electrodes according to the trigger signal TS. The selection of the peep-proof mode can be determined according to the trigger signal TS received by the driving circuit 200. For example, the trigger signal TS may have a first voltage level or a second voltage level, which may be a high voltage level and a low voltage level, respectively, or a low voltage level and a high voltage level, respectively. When the trigger signal TS is at the first voltage level, all the display areas of the display panel 100 do not have the peep-proof effect (i.e., the display panel 100 is operated in the non-peep-proof mode). When the trigger signal TS1 is at the second voltage level, the display area DA2 and the display area DA3 of the display panel 100 have the peep-proof effect, while the display area DA1 does not have the peep-proof effect (i.e. the display panel 100 is operated in the peep-proof mode). In addition, the driving signals for driving the plurality of pixel electrodes include a driving signal DS1 supplied to the plurality of pixel electrodes PE1, a driving signal DS2 supplied to the plurality of pixel electrodes PE2, and a driving signal DS3 supplied to the plurality of pixel electrodes PE 3. The driving signals are respectively transmitted to the pixel electrodes through the data lines, and the pixel electrodes respectively have voltage levels corresponding to display gray scales. Therefore, the maximum voltage level of the driving signal DS1 is also different from the maximum voltage level of the driving signal DS2 and the maximum voltage level of the driving signal DS3.
For example, when the display panel 100 operates in the peep-proof mode, the maximum voltage level of the driving signal DS2 and the maximum voltage level of the driving signal DS3 may be smaller than the maximum voltage level of the driving signal DS1, such that the range of the liquid crystal voltages of the second portion 152 of the liquid crystal layer 150 located in the peep-proof display area DA2 and the third portion 153 of the liquid crystal layer 150 located in the peep-proof display area DA3 is smaller than the range of the liquid crystal voltage of the first portion 151 of the liquid crystal layer 150 located in the normal display area DA 1. Therefore, at the same display gray level, the rotation degree of the liquid crystal molecules of the second portion 152 and the third portion 153 of the liquid crystal layer 150 is smaller than that of the first portion 151, so that the viewing angle range of the display area DA2 and the viewing angle range of the display area DA3 are smaller than that of the display area DA 1. Accordingly, the display area DA2 and the display area DA3 of the display panel 100 have the peep-proof effect.
Referring to fig. 3A to 3C, when the display panel 100 is operated in the peep-proof mode, the display area DA1, the display area DA2 and the display area DA3 respectively have a viewing angle range VR1X, a viewing angle range VR2X and a viewing angle range VR3X in the direction X, and respectively have a viewing angle range VR1Y, a viewing angle range VR2Y and a viewing angle range VR3Y in the direction Y, wherein the viewing angle range VR2X of the display area DA2 and the viewing angle range VR3X of the display area DA3 are smaller than the viewing angle range VR1X of the display area DA1, and the viewing angle range VR2Y of the display area DA2 and the viewing angle range VR3Y of the display area DA3 are smaller than the viewing angle range VR1Y of the display area DA 1. In the present embodiment, the viewing angle range VR2x of the display area DA2 is optionally the same as the viewing angle range VR3x of the display area DA3, and the viewing angle range VR2y of the display area DA2 is optionally the same as the viewing angle range VR3y of the display area DA3, but not limited thereto. In other embodiments, the viewing angle ranges of the different privacy display areas in the privacy mode may be different from each other, but still smaller than the viewing angle range of the normal display area.
In contrast, when the display panel 100 operates in the non-peep-preventing mode, the maximum voltage level of the driving signal DS1, the maximum voltage level of the driving signal DS2, and the maximum voltage level of the driving signal DS3 are set to be identical to each other. Alternatively, the voltage levels of the pixel electrode PE1, the pixel electrode PE2, and the pixel electrode PE3 are substantially the same for the same display gray scale. At this time, the viewing angle ranges of the display area DA1, the display area DA2, and the display area DA3 along a plurality of directions (e.g., the direction X and the direction Y) are the same as each other. For example: when the display panel 100 is operated in the non-peep-preventing mode, the viewing angle range VR1x of the display area DA1, the viewing angle range VR2x″ of the display area DA2, and the viewing angle range VR3x″ of the display area DA3 may be the same as each other (as shown in fig. 4), and the viewing angle range of the display area DA1 in the direction Y, the viewing angle range of the display area DA2 in the direction Y, and the viewing angle range of the display area DA3 in the direction Y may be the same as each other.
In the present embodiment, the display area DA1, the viewing angle range of the display area DA1 and the driving signal DS1 may be referred to as a first display area DA1, a first viewing angle range and a first driving signal DS1, the display area DA2, the viewing angle range of the display area DA2, the driving signal DS2, the display area DA3, the viewing angle range of the display area DA3 and the driving signal DS3 may be referred to as a second display area DA2, a second viewing angle range, a second driving signal DS2, a third display area DA3, a third viewing angle range and a third driving signal DS3, or may be referred to as a third display area DA2, a third viewing angle range, a third driving signal DS2, a second display area DA3, a second viewing angle range and a second driving signal DS3, respectively, but not limited thereto.
Based on the above, the display device 10 of the present embodiment can obtain the peep-proof effect by adjusting the driving signal of the pixel electrode without providing an additional optical film or an electrically controlled liquid crystal cell. Besides effectively reducing the production cost of the display device with the peep-proof display function, the operation elasticity and convenience of the peep-proof display can be increased. On the other hand, since there is no difference in the pixel structure designs of the display panel 100 between the peep-proof display area (e.g., the display area DA2 and the display area DA 3) and the normal display area (e.g., the display area DA 1), no additional process is required. In other words, the display device 10 of the present embodiment has better integration because the display panel 100 is not provided with a special pixel structure design.
Other embodiments will be listed below to describe the present disclosure in detail, wherein like components will be denoted by like reference numerals, and descriptions of the same technical content will be omitted, and reference is made to the foregoing embodiments for parts, and the description thereof will not be repeated.
Fig. 5 is a schematic top view of a display device according to a second embodiment of the present invention. Fig. 6 is a schematic cross-sectional view of the display panel of fig. 5. Fig. 7A to 7C are side views illustrating the viewing angle range of the display panel of fig. 5 when operated in the peep-proof mode. For clarity of presentation, the display panel 100A of fig. 5 only shows the pixel array substrate 110 and the plurality of pixel electrodes PE1 to PE3 of fig. 6.
Referring to fig. 5 and 6, the display device 10A of the present embodiment is different from the display device 10 of fig. 1 in that: the setting positions of the peep-proof display areas are different. Specifically, in the present embodiment, the arrangement direction (e.g., direction Y) of the display area DA1A, the display area DA2A, and the display area DA3A of the display device 10A is perpendicular to the arrangement direction (e.g., direction X) of the display area DA1, the display area DA2, and the display area DA3 of the display device 10 of fig. 1. That is, the display area DA2A and the display area DA3A (i.e., the peep-proof display area) of the present embodiment are disposed on opposite sides of the display area DA1A (i.e., the normal display area) in the direction Y. Correspondingly, the second portion 152A and the third portion 153A of the liquid crystal layer 150A are also disposed on opposite sides of the first portion 151A in the direction Y.
Similar to the display device 10 of fig. 1, the selection of the peep-proof mode of the display device 10A can be determined according to the trigger signal TS received by the driving circuit 200. For example, the trigger signal TS may have a first voltage level or a second voltage level, which may be a high voltage level and a low voltage level, respectively, or a low voltage level and a high voltage level, respectively. When the trigger signal TS is at the first voltage level, all the display areas of the display panel 100A do not have the peep-proof effect (i.e., the display panel 100 is operated in the non-peep-proof mode). When the trigger signal TS1 is at the second voltage level, the display area DA2A and the display area DA3A of the display panel 100A have the peep-proof effect, but the display area DA1A does not have the peep-proof effect (i.e. the display panel 100A is operated in the peep-proof mode).
In order to realize the peep-proof operation of the display panel 100A, the present invention uses the rotation degree of the liquid crystal molecules of the second portion 152A and the third portion 153A of the liquid crystal layer 150A under the same display gray scale to be smaller than the rotation degree of the liquid crystal molecules of the first portion 151A, so that the viewing angle range of the display area DA2A and the viewing angle range of the display area DA3A are smaller than the viewing angle range of the display area DA 1A. Also, therefore, the maximum voltage level of the driving signal DS2A and the maximum voltage level of the pixel driving signal DS3A are set to be smaller than the maximum voltage level of the driving signal DS1A, so that the voltage levels set by the pixel electrode PE2 and the pixel electrode PE3 at each display gray level are different from the voltage level set by the pixel electrode PE 1.
Specifically, when the display panel 100A is operated in the peep-preventing mode, the viewing angle ranges of the display area DA2A and the display area DA3A along the plurality of directions (e.g., the direction X and the direction Y) are smaller than the viewing angle range of the display area DA1A along the plurality of directions. Referring to fig. 7A to 7C, when the display panel 100A is operated in the peep-proof mode, the display area DA1A, the display area DA2A and the display area DA3A respectively have a viewing angle range VR1X ', a viewing angle range VR2X' and a viewing angle range VR3X 'in the direction X, and respectively have a viewing angle range VR1Y', a viewing angle range VR2Y 'and a viewing angle range VR3Y' in the direction Y, wherein the viewing angle range VR2X 'of the display area DA2A and the viewing angle range VR3X' of the display area DA3A are smaller than the viewing angle range VR1X 'of the display area DA1A, and the viewing angle range VR2Y' of the display area DA2A and the viewing angle range VR3Y 'of the display area DA3A are smaller than the viewing angle range VR1Y' of the display area DA 1A.
In contrast, when the display panel 100A operates in the non-peep-preventing mode, the maximum voltage level of the driving signal DS1A, the maximum voltage level of the driving signal DS2A, and the maximum voltage level of the driving signal DS3A are set to be the same as each other. Alternatively, the voltage levels of the pixel electrode PE1, the pixel electrode PE2, and the pixel electrode PE3 are substantially the same for the same display gray scale. At this time, the viewing angle ranges of the display area DA1A, the display area DA2A, and the display area DA3A along a plurality of directions (e.g., the direction X and the direction Y) are the same as each other.
In the present embodiment, the display area DA1A, the viewing angle range of the display area DA1A, and the driving signal DS1A may be referred to as a first display area DA1A, a first viewing angle range, and a first driving signal DS1A, the display area DA2A, the viewing angle range of the display area DA2A, the driving signal DS2A, the display area DA3A, the viewing angle range of the display area DA3A, and the driving signal DS3A may be referred to as a second display area DA2A, a second viewing angle range, a second driving signal DS2A, a third display area DA3A, a third viewing angle range, and a third driving signal DS3A, or may be referred to as a third display area DA2A, a third viewing angle range, a third driving signal DS2A, a second display area DA3A, a second viewing angle range, and a second driving signal DS3A, respectively, but not limited thereto.
Fig. 8 is a schematic top view of a display device according to a third embodiment of the present invention. Fig. 9A and 9B are schematic cross-sectional views of the display panel of fig. 8. Fig. 10A and 10B are side views of the viewing angle range of the display panel of fig. 8 when operated in the peep-proof mode. For clarity of presentation, the display panel 100B of fig. 8 only shows the pixel array substrate 110 and the plurality of pixel electrodes PE1 to PE5 of fig. 9A and 9B.
Referring to fig. 8 to 9B, the display device 20 of the present embodiment is different from the display device 10 of fig. 1 in that: the number of the peep-proof display areas is different. In the present embodiment, the display surface of the display panel 100B of the display device 20 may be divided into a display area DA1B, a display area DA2B, a display area DA3B, a display area DA4B, and a display area DA5B, and these display areas are arranged along the direction X and the direction Y, respectively. In this embodiment, the display area DA1B may also be referred to as a first display area, one and the other of the display area DA2B and the display area DA3B, and one and the other of the display area DA4B and the display area DA5B may also be referred to as a second display area, a third display area, a fourth display area and a fifth display area, or may be referred to as a fourth display area, a fifth display area, a second display area and a third display area, respectively, but not limited thereto. For example, the display area DA1B, the display area DA2B, and the display area DA3B are arranged along the direction X, the display area DA1B, the display area DA4B, and the display area DA5B are arranged along the direction Y, and the display area DA1B is surrounded by the display area DA2B, the display area DA3B, the display area DA4B, and the display area DA 5B. That is, the display area DA2B and the display area DA3B are disposed on opposite sides of the display area DA1B in the direction X, and the display area DA4B and the display area DA5B are disposed on opposite sides of the display area DA1B in the direction Y. When one and the other of the display area DA2B and the display area DA3B and one and the other of the display area DA4B and the display area DA5B are referred to as a second display area, a third display area, a fourth display area, and a fifth display area, respectively, one and the other of the display area DA2B and the display area DA3B may also be referred to as a first side and a second side disposed in the direction X of the display area DA1B, and one and the other of the display area DA4B and the display area DA5B are disposed in a third side and a fourth side of the display area DA1B in the direction Y; when one and the other of the display area DA2B and the display area DA3B and one and the other of the display area DA4B and the display area DA5B are referred to as a fourth display area, a fifth display area, a second display area, and a third display area, respectively, one and the other of the display area DA2B and the display area DA3B may also be referred to as being disposed at a third side and a fourth side of the display area DA1B in the direction X, and one and the other of the display area DA4B and the display area DA5B are disposed at a first side and a second side of the display area DA1B in the direction Y, but not limited thereto.
In the present embodiment, the number of the peep-proof display areas of the display device 20 is described by taking four examples, for example: the display area DA2B, the display area DA3B, the display area DA4B and the display area DA5B are peep-proof display areas of the present embodiment, and the display area DA1B is a normal display area, but not limited thereto. In other embodiments, the number and placement of privacy display areas (or normal display areas) may be adjusted depending on the actual product application.
On the other hand, the plurality of pixel electrodes of the display panel 100B may correspondingly include a plurality of pixel electrodes PE1 located in the display area DA1B, a plurality of pixel electrodes PE2 located in the display area DA2B, a plurality of pixel electrodes PE3 located in the display area DA3B, a plurality of pixel electrodes PE4 located in the display area DA4B, and a plurality of pixel electrodes PE5 located in the display area DA5B. The liquid crystal layer 150B has a first portion 151B, a second portion 152B, a third portion 153B, a fourth portion 154B, and a fifth portion 155B, and the five portions 151B to 155B of the liquid crystal layer 150B overlap the display area DA1B, the display area DA2B, the display area DA3B, the display area DA4B, and the display area DA5B, respectively, in the direction Z. The pixel electrodes PE1 are used to drive the first portion 151B of the liquid crystal layer 150B. The pixel electrodes PE2 are used to drive the second portion 152B of the liquid crystal layer 150B. The pixel electrodes PE3 are used to drive the third portion 153B of the liquid crystal layer 150B. The pixel electrodes PE4 are used to drive the fourth portion 154B of the liquid crystal layer 150B. The pixel electrodes PE5 are used to drive the fifth portion 155B of the liquid crystal layer 150B.
In order to make the viewing angle ranges of the display area DA2B, the display area DA3B, the display area DA4B and the display area DA5B different from the viewing angle range of the display area DA1B, the voltage levels set by the pixel electrode PE2, the pixel electrode PE3, the pixel electrode PE4 and the pixel electrode PE5 at each display gray level are different from the voltage level set by the pixel electrode PE 1. Alternatively, when the display panel 100B is operated in the peep-proof mode, the maximum voltage level of the enable pixel electrode PE2, the maximum voltage level of the enable pixel electrode PE3, the maximum voltage level of the enable pixel electrode PE4, and the maximum voltage level of the enable pixel electrode PE5 are different from the maximum voltage level of the enable pixel electrode PE 1. The above-mentioned difference in the arrangement of the voltage levels can enable the liquid crystal molecules of the liquid crystal layer 150B in the normal display area and the liquid crystal molecules in the peep-proof display area to rotate to different degrees, thereby generating different visual angle ranges. In the present embodiment, the viewing angle range of the display area DA1B may also be referred to as a first viewing angle range, and when one and the other of the display area DA2B and the display area DA3B and one and the other of the display area DA4B and the display area DA5B are referred to as a second display area, a third display area, a fourth display area and a fifth display area, respectively, or are referred to as a fourth display area, a fifth display area, a second display area and a third display area, respectively, the viewing angle range of one and the other of the display area DA2B and the display area DA3B and the viewing angle range of one and the other of the display area DA4B and the display area DA5B may be referred to as a second viewing angle range, a third viewing angle range, a fourth viewing angle range and a fifth viewing angle range, respectively, or are referred to as a fourth viewing angle range, a fifth viewing angle range, a second viewing angle range and a third viewing angle range, respectively, but not limited thereto.
It is particularly noted that the driving circuit 200A of the present embodiment has two trigger pins, i.e., a first trigger pin TP1 and a second trigger pin TP2. The driving circuit 200A may receive the first trigger signal TS1 and the second trigger signal TS2 via the two trigger pins TP1, TP2, and generate a plurality of driving signals for driving a plurality of pixel electrodes according to the first trigger signal TS1 and the second trigger signal TS 2. In the present embodiment, the driving signals include a driving signal DS1B provided to the plurality of pixel electrodes PE1, a driving signal DS2B provided to the plurality of pixel electrodes PE2, a driving signal DS3B provided to the plurality of pixel electrodes PE3, a driving signal DS4B provided to the plurality of pixel electrodes PE4, and a driving signal DS5B provided to the plurality of pixel electrodes PE 5. In the present embodiment, the driving signal DS1B may also be referred to as a first driving signal, and when one and the other of the display area DA2B and the display area DA3B and one and the other of the display area DA4B and the display area DA5B are referred to as a second display area, a third display area, a fourth display area and a fifth display area, respectively, or are referred to as a fourth display area, a fifth display area, a second display area and a third display area, respectively, one and the other of the driving signal DS2B and the driving signal DS3B and one and the other of the driving signal DS4B and the driving signal DS5B may be referred to as a second driving signal, a third driving signal, a fourth driving signal and a fifth driving signal, respectively, or are referred to as a fourth driving signal, a fifth driving signal, a second driving signal and a third driving signal, respectively, but not limited thereto.
In the present embodiment, the display device 20 can be operated in a plurality of peep-proof modes, and the selection of the peep-proof modes can be determined according to the first trigger signal TS1 and the second trigger signal TS2 received by the driving circuit 200A. For example, the first trigger signal TS1 may have a first voltage level or a second voltage level, the first voltage level is greater than or less than the second voltage level, and the second trigger signal TS2 may have a third voltage level or a fourth voltage level, the third voltage level is greater than or less than the fourth voltage level. When the driving circuit 200A receives the first trigger signal TS1 and the second trigger signal TS2 at the second voltage level and the fourth voltage level, respectively, all the display areas of the display panel 100B do not have the peep-proof effect (i.e., the display panel 100B is operated in the non-peep-proof mode). When the driving circuit 200A receives the first trigger signal TS1 and the second trigger signal TS2 at the first voltage level and the fourth voltage level, respectively, the display area DA2B and the display area DA3B of the display panel 100B have the peep-preventing effect, and the display area DA4B and the display area DA5B do not have the peep-preventing effect (i.e. the display panel 100B is operated in the first peep-preventing mode).
In view of the above, when the driving circuit 200A receives the first trigger signal TS1 and the second trigger signal TS2 at the second voltage level and the third voltage level, respectively, the display area DA2B and the display area DA3B of the display panel 100B have no peep-proof effect, and the display area DA4B and the display area DA5B have peep-proof effect (i.e. the display panel 100B is operated in the second peep-proof mode). When the driving circuit 200A receives the first trigger signal TS1 and the second trigger signal TS2 at the first voltage level and the third voltage level, respectively, the display area DA2B, the display area DA3B, the display area DA4B, and the display area DA5B of the display panel 100B have the peep-preventing effect (i.e., the display panel 100B is operated in the third peep-preventing mode).
In a variant embodiment, the driving circuit 200A may have a trigger pin, and the driving circuit 200A may receive the trigger signal via the trigger pin and generate a plurality of driving signals for driving a plurality of pixel electrodes according to the trigger signal. For example, the voltage levels of the trigger signals may be "high voltage level and low voltage level in sequence", "low voltage level and high voltage level in sequence", "all high voltage levels" or "all low voltage levels", and when the voltage level of the trigger signal is one of the four trigger signals, the display panel 100B may be correspondingly operated in the non-peeping mode, the first peeping mode, the second peeping mode or the third peeping mode.
Since the operation principle of the first peep-proof mode and the second peep-proof mode of the display panel 100B is similar to that of the display panel 100 of fig. 1 and the display panel 100A of fig. 5, the detailed description is made in the related paragraphs of the foregoing embodiments, and the detailed description is omitted here. The following description is made only for the third peep-proof mode of the display panel 100B.
When the display panel 100B operates in the third peep-proof mode, the maximum voltage level of the driving signal DS2B, the maximum voltage level of the driving signal DS3B, the maximum voltage level of the driving signal DS4B, and the maximum voltage level of the driving signal DS5B may be smaller than the maximum voltage level of the driving signal DS 1B. Accordingly, the rotation degree of the liquid crystal molecules of each of the second portion 152B, the third portion 153B, the fourth portion 154B, and the fifth portion 155B of the liquid crystal layer 150B is smaller than that of the first portion 151 at the same display gray scale, so that the viewing angle range of the display area DA2B, the viewing angle range of the display area DA3B, the viewing angle range of the display area DA4B, and the viewing angle range of the display area DA5B are smaller than those of the display area DA1B in a plurality of directions (e.g., the direction X and the direction Y). Accordingly, the display area DA2B, the display area DA3B, the display area DA4B and the display area DA5B of the display panel 100B have the peep-proof effect.
Referring to fig. 10A and 10B, when the display panel 100B is operated in the third peep-preventing mode, the display area DA1B, the display area DA2B and the display area DA3B respectively have a viewing angle range VR1X, a viewing angle range VR2X and a viewing angle range VR3X in the direction X, and the display area DA1B, the display area DA4B and the display area DA5B respectively have a viewing angle range VR1Y, a viewing angle range VR4Y and a viewing angle range VR5Y in the direction Y, wherein the viewing angle range VR2X of the display area DA2B and the viewing angle range VR3X of the display area DA3B are smaller than the viewing angle range VR1X of the display area DA1B, and the viewing angle range VR4Y of the display area DA4B and the viewing angle range VR5Y of the display area DA5B are smaller than the viewing angle range VR1Y of the display area DA 1B. It should be understood that the viewing angle range of the display area DA2B and the display area DA3B in the direction Y is also smaller than the viewing angle range (not shown) of the display area DA1B in the direction Y, and the viewing angle range of the display area DA4B and the display area DA5B in the direction X is also smaller than the viewing angle range (not shown) of the display area DA1B in the direction X.
In the present embodiment, the viewing angle ranges of the display area DA2B, the display area DA3B, the display area DA4B and the display area DA5B in the same direction may be the same, but not limited thereto. In other embodiments, the viewing angle ranges of the different privacy display areas in the privacy mode may also be different from each other, but still smaller than the viewing angle range of the normal display area (e.g., the first display area).
Further, when the display panel 100B operates in the non-peep-preventing mode, the maximum voltage level of the driving signal DS1B, the maximum voltage level of the driving signal DS2B, the maximum voltage level of the driving signal DS3B, the maximum voltage level of the driving signal DS4B, and the maximum voltage level of the driving signal DS5B are all set to be the same as each other. Alternatively, the voltage levels of the pixel electrode PE1, the pixel electrode PE2, the pixel electrode PE3, the pixel electrode PE4, and the pixel electrode PE5 are substantially the same for the same display gray scale. At this time, the viewing angle ranges of the display area DA1B, the display area DA2B, the display area DA3B, the display area DA4B, and the display area DA5B along a plurality of directions (for example, the direction X and the direction Y) are the same as each other.
In the display device according to an embodiment of the present invention, when the display device is operated in the peep-proof mode, the maximum voltage level of the first driving signal supplied to the first pixel electrode by the driving circuit is different from the maximum voltage level of the second driving signal supplied to the second pixel electrode. Therefore, the visual angle range of the first display area of the display device is different from that of the second display area, and the operation elasticity and convenience of peep-proof display are improved. Because the pixel structure designs of the two display areas (such as the peep-proof display area and the normal display area) are the same, the peep-proof display effect can be achieved without arranging an additional optical film or an electric control liquid crystal box. Therefore, the display device of the invention has cost advantages although having peep-proof function.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (9)

1. A display device comprising a display panel, and the display panel comprising:
a first display area having a first viewing angle range;
the second display area is arranged on a first side of the first display area in the first direction and is provided with a second visual angle range;
a liquid crystal layer having a plurality of first portions overlapping the first display region and a plurality of second portions overlapping the second display region;
the pixel array substrate comprises a plurality of pixel electrodes, a plurality of active elements, a plurality of data lines and a plurality of scanning lines, wherein the pixel electrodes are overlapped and arranged on the liquid crystal layer, the pixel electrodes comprise a plurality of first pixel electrodes and a plurality of second pixel electrodes, the first pixel electrodes are used for driving the first parts of the liquid crystal layer, the second pixel electrodes are used for driving the second parts of the liquid crystal layer, and each pixel electrode is electrically coupled with one of the data lines and one of the scanning lines through one of the active elements; and
A driving circuit providing a plurality of first driving signals to the plurality of first pixel electrodes and a plurality of second driving signals to the plurality of second pixel electrodes, wherein the plurality of first driving signals and the plurality of second driving signals are respectively transferred to the plurality of first pixel electrodes and the plurality of second pixel electrodes via the plurality of data lines, and the plurality of first pixel electrodes and the plurality of second pixel electrodes respectively have corresponding voltage levels,
wherein when the display panel displays a picture and operates in a peep-proof mode, the first visual angle range of the first display area is larger than the second visual angle range of the second display area, the maximum voltage level of the plurality of first driving signals is larger than the maximum voltage level of the plurality of second driving signals, the range of the liquid crystal voltage of each of the plurality of first parts of the liquid crystal layer is 0 volt to X volts, the range of the liquid crystal voltage of each of the plurality of second parts of the liquid crystal layer is 0 volt to Y volts, X and Y are both larger than 0, Y is smaller than X, the liquid crystal voltage of each of the plurality of first parts of the liquid crystal layer is an absolute value of the difference value of the voltage level of each of the plurality of first pixel electrodes and the corresponding common electrode, the liquid crystal voltage of each of the plurality of second parts of the liquid crystal layer is an absolute value of the difference value of the voltage level of each of the plurality of second pixel electrodes and the corresponding common electrode, the liquid crystal voltage of each of the plurality of first parts of the liquid crystal layer is an integer of the liquid crystal voltage of each of the plurality of first parts of the liquid crystal layer is M and the voltage of the liquid crystal of each of the plurality of first parts of the liquid crystal layer is an integer of M and the positive voltage of each of the liquid crystal layer is larger than M,
Wherein when one of the plurality of first pixel electrodes and one of the plurality of second pixel electrodes drive one of the plurality of first portions and one of the plurality of second portions of the liquid crystal layer, respectively, and the one of the plurality of first portions and the one of the plurality of second portions of the liquid crystal layer are both operating at the same one of the M gray scales, the voltage level of the one of the plurality of first pixel electrodes is different from the voltage level of the one of the plurality of second pixel electrodes.
2. The display device of claim 1, wherein the first viewable range of the first display area is equal to the second viewable range of the second display area and the maximum voltage level of the plurality of first drive signals is equal to the maximum voltage level of the plurality of second drive signals when the display panel is operated in a non-privacy mode.
3. The display device according to claim 1, further comprising:
a third display region disposed on a second side of the first display region and having a third viewing angle range, the first side and the second side being opposite sides of the first display region in the first direction, the liquid crystal layer further having a plurality of third portions overlapping the third display region, the plurality of pixel electrodes further including a plurality of third pixel electrodes for driving the plurality of third portions of the liquid crystal layer, the driving circuit further providing a plurality of third driving signals to the plurality of third pixel electrodes,
Wherein when the display panel is operated in the peep-proof mode, the third viewable range of the third display area is different from the first viewable range of the first display area, and the maximum voltage level of the plurality of third driving signals is different from the maximum voltage level of the plurality of first driving signals.
4. The display device according to claim 3, wherein the first viewable range of the first display area is greater than the second viewable range of the second display area and the third viewable range of the third display area, and the maximum voltage level of the plurality of second driving signals and the maximum voltage level of the plurality of third driving signals are less than the maximum voltage level of the plurality of first driving signals when the display panel is operated in the privacy mode.
5. The display device according to claim 3, wherein the first viewing angle range of the first display region, the second viewing angle range of the second display region, and the third viewing angle range of the third display region are identical to each other, and the maximum voltage levels of the plurality of first driving signals, the maximum voltage levels of the plurality of second driving signals, and the maximum voltage levels of the plurality of third driving signals are identical to each other when the display panel is operated in a non-peeping mode.
6. The display device according to claim 1, further comprising:
a fourth display region disposed on a third side of the first display region in a second direction and having a fourth viewing angle range, the second direction intersecting the first direction, the liquid crystal layer further having a plurality of fourth portions overlapping the fourth display region, the plurality of pixel electrodes further including a plurality of fourth pixel electrodes for driving the plurality of fourth portions of the liquid crystal layer, the driving circuit further providing a plurality of fourth driving signals to the plurality of fourth pixel electrodes,
wherein the fourth viewable range of the fourth display area is different from the first viewable range of the first display area when the display panel is operated in another privacy mode, the maximum voltage level of the plurality of fourth drive signals being different from the maximum voltage level of the plurality of first drive signals.
7. The display device of claim 6, wherein the first viewable range of the first display area is greater than the fourth viewable range of the fourth display area and the maximum voltage level of the plurality of fourth drive signals is less than the maximum voltage level of the plurality of first drive signals when the display panel is operated in the other privacy mode.
8. The display device according to claim 7, wherein when the display panel is operated in the other peep-proof mode, the first viewing angle range of the first display region is greater than the fourth viewing angle range of the fourth display region, the first viewing angle range of the first display region is equal to the second viewing angle range of the second display region, the maximum voltage level of the plurality of fourth driving signals is less than the maximum voltage level of the plurality of first driving signals, and the maximum voltage level of the plurality of first driving signals is equal to the maximum voltage level of the plurality of second driving signals.
9. The display device according to claim 7, wherein when the display panel is operated in the other peep-proof mode, the first viewing angle range of the first display region is larger than the second viewing angle range of the second display region and the fourth viewing angle range of the fourth display region, and the maximum voltage level of the plurality of second driving signals and the maximum voltage level of the plurality of fourth driving signals are smaller than the maximum voltage level of the plurality of first driving signals.
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