CN116863873B - Display driving circuit, display driving method and display device - Google Patents
Display driving circuit, display driving method and display device Download PDFInfo
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- CN116863873B CN116863873B CN202311134668.0A CN202311134668A CN116863873B CN 116863873 B CN116863873 B CN 116863873B CN 202311134668 A CN202311134668 A CN 202311134668A CN 116863873 B CN116863873 B CN 116863873B
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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
- 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]
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones using sub-pixels
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Abstract
The application belongs to the field of display, and particularly relates to a display driving circuit, a display driving method and a display device, wherein the display driving circuit comprises: the driving module comprises a first driving signal output end, and a first part of peep-proof sub-pixels are connected with the first driving signal output end; the power module comprises a first power end and a second power end; the driving inversion module is connected with the first driving signal output end, the first power end and the second power end, and comprises a second driving signal output end, the second part peep-proof sub-pixel is connected with the second driving signal output end, and the signals of the second driving signal output end and the first driving signal output end are different, so that the brightness and/or the starting time of the first part peep-proof sub-pixel and the second part peep-proof sub-pixel are different. In the peep-proof mode, the display panel presents peep-proof pictures with light and shade or flickering, and the peep-proof effect of the display panel is enhanced.
Description
Technical Field
The application belongs to the field of display, and particularly relates to a display driving circuit, a display driving method and a display device.
Background
An OLED (Organic Light-Emitting Diode) display panel has advantages of self-luminescence, flexibility, thin thickness, high brightness, low power consumption, fast response, wide color gamut, etc., and is widely used in electronic products such as televisions, mobile phones, notebooks, etc. The display panel has a wider viewing angle, which can bring better visual experience to users, but sometimes users also want the display panel to be peep-proof, thereby effectively protecting business confidentiality and personal privacy.
In order to facilitate the switch peep-proof function, peep-proof pixels are arranged in pixel units of some display panels, and after the peep-proof pixels are started, light emitted by the peep-proof pixels interferes with light of the display pixels in oblique viewing, so that peep-proof in oblique viewing is realized; when in forward vision, the light emitted by the peep-proof pixels is blocked, so that normal display is realized. After the peep-proof pixel is closed, the display panel can normally display.
However, when all the peep-proof pixels are turned on or turned off simultaneously, the brightness of all the peep-proof pixels is consistent, and the peep-proof effect of the display panel is poor.
Disclosure of Invention
The application aims to provide a display driving circuit, a display driving method and a display device, so as to enhance the peep-proof effect of a display panel.
In order to achieve the above object, the present application provides a display driving circuit for driving a display panel, the display panel including a plurality of pixel units arranged in an array, at least a part of the pixel units including peep-proof sub-pixels, the display driving circuit comprising:
the driving module comprises a first driving signal output end, the display panel further comprises a first pixel driving circuit, and a first part of peep-proof sub-pixels are connected with the first driving signal output end through the first pixel driving circuit;
the power module comprises a first power end and a second power end, and the voltage of the first power end is larger than that of the second power end;
the driving inversion module is connected with the first driving signal output end, the first power end and the second power end, the driving inversion module comprises a second driving signal output end, a second part of peeping-proof sub-pixels are connected with the second driving signal output end through the first pixel driving circuit, and signals of the second driving signal output end and signals of the first driving signal output end are different, so that the brightness and/or the opening time of the first part of peeping-proof sub-pixels and the second part of peeping-proof sub-pixels are different.
Optionally, the signal frequency of the second driving signal output end is the same as the signal frequency of the first driving signal output end, and the waveforms of the signals are opposite, so that the opening time of the peep-proof sub-pixel of the first part is different from that of the peep-proof sub-pixel of the second part.
Optionally, the driving inversion module includes a first transistor and a second transistor, at least the first transistor is a vertical double-gate transistor;
the first connecting end and the first control end of the first transistor are connected with the first power supply end, the second connecting end of the first transistor is connected with a connecting node, and the connecting node and the second control end of the first transistor are connected with the second driving signal output end;
the first connecting end of the second transistor is connected with the connecting node, the second connecting end of the second transistor is connected with the second power supply end, and the first control end of the second transistor is connected with the first driving signal output end.
Optionally, the width-to-length ratio of the second transistor channel is greater than the width-to-length ratio of the first transistor channel.
Optionally, the first transistor and the second transistor are vertical double-gate transistors;
The driving module further comprises a control output end, a second control end of the second transistor is connected with the control output end, and the control output end is used for controlling the brightness of the second part of peep-proof sub-pixels.
Optionally, the peep-proof sub-pixels in odd unit rows are connected with the first driving signal output end through the first pixel driving circuit, the peep-proof sub-pixels in even unit rows are connected with the second driving signal output end through the first pixel driving circuit, and the unit rows comprise one or more rows of the peep-proof sub-pixels; or (b)
The peep-proof sub-pixels of the odd unit columns are connected with the first driving signal output end through the first pixel driving circuit, the peep-proof sub-pixels of the even unit columns are connected with the second driving signal output end through the first pixel driving circuit, and the unit columns comprise one or more columns of peep-proof sub-pixels.
Optionally, the power module further includes a third power terminal and a fourth power terminal, where the voltage of the third power terminal is greater than the voltage of the fourth power terminal;
the first pixel driving circuit comprises a third transistor, a control end of the third transistor is connected with the first driving signal output end or the second driving signal output end, a first connecting end of the third transistor is connected with the third power end, and a second connecting end of the third transistor is connected with the fourth power end through the peep-proof sub-pixel;
The pixel unit further comprises a display sub-pixel, the display sub-pixel is connected with a second pixel driving circuit, the second pixel driving circuit at least comprises a fourth transistor, a fifth transistor and a storage capacitor, the control end of the fourth transistor is connected with a scanning line, the first connection end of the fourth transistor is connected with a data line, the second connection end of the fourth transistor is connected with the control end of the fifth transistor, the first connection end of the fifth transistor is connected with the third power supply end, the second connection end of the fifth transistor is connected with the fourth power supply end through the display sub-pixel, and the storage capacitor is connected with the control end and the first connection end of the fifth transistor.
Optionally, the power module further includes a third power terminal, a fourth power terminal, and a fifth power terminal, where the third power terminal voltage and the fifth power terminal voltage are both greater than the fourth power terminal voltage, and the third power terminal voltage and the fifth power terminal voltage are different;
the first pixel driving circuit comprises a third transistor, a control end of the third transistor is connected with the first driving signal output end or the second driving signal output end, a first connection end of the third transistor of an odd unit row is connected with the third power supply end, a first connection end of the third transistor of an even unit row is connected with the fifth power supply end, and a second connection end of the third transistor is connected with the fourth power supply end through the peep-proof sub-pixel;
The pixel unit further comprises a display sub-pixel, the display sub-pixel is connected with a second pixel driving circuit, the second pixel driving circuit at least comprises a fourth transistor, a fifth transistor and a storage capacitor, the control end of the fourth transistor is connected with a scanning line, the first connection end of the fourth transistor is connected with a data line, the second connection end of the fourth transistor is connected with the control end of the fifth transistor, the first connection end of the fifth transistor is connected with the third power supply end, the second connection end of the fifth transistor is connected with the fourth power supply end through the display sub-pixel, and the storage capacitor is connected with the control end and the first connection end of the fifth transistor.
The application also provides a display driving method for the display driving circuit, which comprises the following steps:
acquiring a display mode of a display panel, wherein the display mode comprises a peep-proof mode and a wide view angle mode;
when the display mode of the display panel is confirmed to be the peep-proof mode, controlling a first driving signal output end of the driving module to output signals and controlling a second driving signal output end of the driving inversion module to output signals, so that the brightness and/or the starting time of the peep-proof sub-pixels of the first part are different from those of the peep-proof sub-pixels of the second part;
And when the display mode of the display panel is confirmed to be the wide-viewing angle mode, controlling the first driving signal output end and the second driving signal output end to stop outputting signals.
The present application also provides a display device including:
the display panel comprises a plurality of pixel units arranged in an array, and at least part of the pixel units comprise peep-proof sub-pixels;
the display driving circuit is characterized in that a first driving signal output end of the display driving circuit is connected with a first part of the peep-proof sub-pixels, and a second driving signal output end of the display driving circuit is connected with a second part of the peep-proof sub-pixels.
The display driving circuit, the display driving method and the display device disclosed by the application have the following beneficial effects:
in the application, the driving module comprises a first driving signal output end, the first part of peeping-preventing sub-pixel 131 is connected with the first driving signal output end through a first pixel driving circuit, the power module comprises a first power end and a second power end, the voltage of the first power end is larger than that of the second power end, the driving inversion module is connected with the first driving signal output end, the first power end and the second power end, the driving inversion module comprises a second driving signal output end, the second part of peeping-preventing sub-pixel is connected with the second driving signal output end through the first pixel driving circuit, and the signals of the second driving signal output end and the signals of the first driving signal output end are different, so that the brightness and/or the starting time of the first part of peeping-preventing sub-pixel and the second part of peeping-preventing sub-pixel are different. In the peep-proof mode, the display panel presents peep-proof pictures with light and shade or flickering, and the peep-proof effect of the display panel is enhanced.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a display driving circuit for driving a display panel according to an embodiment of the application.
Fig. 2 is a schematic structural diagram of a display panel according to a first embodiment of the application.
Fig. 3 is a schematic diagram of a display driving circuit according to a first embodiment of the application.
Fig. 4 is a schematic view illustrating a peep-proof principle of a display panel according to a first embodiment of the application.
Fig. 5 is a schematic diagram of driving signals of the peep-proof sub-pixel according to the first embodiment of the application.
Fig. 6 is a schematic diagram of a structure of a driving inverter module according to a first embodiment of the application.
Fig. 7 is a schematic diagram of a second transistor current according to a first embodiment of the application.
Fig. 8 is a schematic diagram of a first pixel driving circuit according to a first embodiment of the application.
Fig. 9 is a schematic diagram of a third transistor current in accordance with a first embodiment of the present application.
Fig. 10 is a schematic diagram of a second pixel driving circuit according to the first embodiment of the application.
Fig. 11 is a schematic diagram of a display driving circuit for driving a display panel according to a second embodiment of the application.
Fig. 12 is a schematic diagram of a third transistor current in a second embodiment of the application.
Fig. 13 is a schematic diagram of a display driving method in a third embodiment of the present application.
Fig. 14 is a flowchart of a display driving method in the third embodiment of the present application.
Fig. 15 is a schematic structural diagram of a display device in a fourth embodiment of the present application.
Reference numerals illustrate:
100. a display panel; 110. a scanning line; 120. a data line; 130. a pixel unit; 131. peep-proof sub-pixels; 132. displaying the sub-pixels; 140. a first pixel driving circuit; 141. a third transistor; 150. a second pixel driving circuit; 151. a fourth transistor; 152. a fifth transistor; 153. a storage capacitor;
200. a driving module; 210. a first drive signal output terminal; 220. a control output;
300. A power module; 310. a first power supply terminal; 320. a second power supply terminal; 330. a third power supply terminal; 340. a fourth power supply terminal; 350. a fifth power supply terminal;
400. driving the inverting module; 410. a second drive signal output terminal; 420. a first transistor; 430. and a second transistor.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The application will be described in further detail with reference to the drawings and the specific examples. It should be noted that the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
Example 1
Referring to fig. 1 to 3, the display panel 100 includes a plurality of rows of scan lines 110, a plurality of columns of data lines 120, and a plurality of pixel units 130, the pixel units 130 being disposed at intersections of the scan lines 110 and the data lines 120. The pixel unit 130 includes at least one display sub-pixel 132, and at least a portion of the pixel unit 130 further includes a peep-proof sub-pixel 131. The at least one display sub-pixel 132 may include a red display sub-pixel 132 (R), a green display sub-pixel 132 (G), and a blue display sub-pixel 132 (B) to implement RGB display. The peep-proof sub-pixels 131 may include a yellow peep-proof sub-pixel 131 (F), a white peep-proof sub-pixel 131 (W), a red peep-proof sub-pixel 131, etc., that is, the peep-proof sub-pixel 131 may be the same as or different from the display sub-pixel 132, and the peep-proof sub-pixels 131 may be one or more. The present embodiment is described by taking the arrangement of one peep-proof sub-pixel 131 as an example. The display sub-pixel 132 and the peep-proof sub-pixel 131 may be organic light emitting diodes or light emitting diodes.
Referring to fig. 4, a part or all of the pixel units 130 are provided with peep-proof sub-pixels 131, and a light shielding unit is disposed right above the peep-proof sub-pixels 131. The peep-proof sub-pixel 131 can be turned on or off to realize switching between the peep-proof mode and the wide viewing angle mode. After the peep-proof sub-pixel 131 is started, during oblique viewing, the light emitted by the peep-proof sub-pixel 131 interferes with the light emitted by the display sub-pixel 132, so that the display in a narrow view angle mode is realized, namely, peep-proof during oblique viewing is realized; in the forward viewing, the light emitted from the peep-proof sub-pixel 131 is blocked by the light blocking unit, so that the display in the wide viewing angle mode is realized.
The display driving circuit includes a driving module 200, a power module 300, and a driving inversion module 400. The driving module 200 includes a first driving signal output end 210, the display panel 100 further includes a first pixel driving circuit 140, and the first portion of the peep-preventing sub-pixels 131 are connected to the first driving signal output end 210 through the first pixel driving circuit 140. The power module 300 includes a first power terminal 310 and a second power terminal 320, wherein a voltage VGH of the first power terminal 310 is greater than a voltage VGL of the second power terminal 320.
The driving inverter module 400 is connected to the first driving signal output terminal 210, the first power terminal 310, and the second power terminal 320. The driving inversion module 400 includes a second driving signal output terminal 410, and the second portion of the peep-proof sub-pixels 131 are connected to the second driving signal output terminal 410 through the first pixel driving circuit 140. The second driving signal output 410 and the first driving signal output 210 are different, so that the brightness and/or the on-time of the first portion of the peep-proof sub-pixel 131 and the second portion of the peep-proof sub-pixel 131 are different.
The arrangement modes of the first part peep-proof sub-pixel 131 and the second part peep-proof sub-pixel 131 can be set at will, and only the human eyes can distinguish whether the positions of the first part peep-proof sub-pixel 131 and the second part peep-proof sub-pixel 131 are different. For example, the first portion of the peep-proof sub-pixels 131 are one or more rows of peep-proof sub-pixels 131, and the second portion of the peep-proof sub-pixels 131 are one or more rows of peep-proof sub-pixels 131 adjacently arranged. The first portion of peep-proof sub-pixels 131 are a plurality of adjacent peep-proof sub-pixels 131, and the second portion of peep-proof sub-pixels 131 are a plurality of adjacent peep-proof sub-pixels 131 and are adjacent to the first portion of peep-proof sub-pixels 131.
When the brightness of the first portion of peep-proof sub-pixel 131 is different from that of the second portion of peep-proof sub-pixel 131, the display panel 100 may present peep-proof images with alternate brightness and darkness, so as to enhance the peep-proof effect of the display panel 100. When the first portion of the peep-preventing sub-pixels 131 and the second portion of the peep-preventing sub-pixels 131 have different opening times, the display panel 100 may present peep-preventing images with light and shade alternately flashing in different areas, so as to enhance the peep-preventing effect of the display panel 100. When the brightness of the first portion of peep-proof sub-pixel 131 is different from that of the second portion of peep-proof sub-pixel 131 and the opening time is different, the display panel 100 presents peep-proof images with different brightness and brightness flickering alternately, so as to further enhance the peep-proof effect of the display panel 100.
The extra peep-proof sub-pixel 131 in the pixel unit 130 occupies the design space of the display sub-pixel 132, the size of the peep-proof sub-pixel 131 is limited, and the brightness of the peep-proof sub-pixel 131 is difficult to be high, resulting in poor peep-proof effect of the display panel 100.
In this embodiment, the driving module 200 includes a first driving signal output end 210, the first portion of the peep-preventing sub-pixel 131 is connected to the first driving signal output end 210 through the first pixel driving circuit 140, the power module 300 includes a first power end 310 and a second power end 320, the voltage VGH of the first power end 310 is greater than the voltage VGL of the second power end 320, the driving inversion module 400 is connected to the first driving signal output end 210, the first power end 310 and the second power end 320, the driving inversion module 400 includes a second driving signal output end 410, the second portion of the peep-preventing sub-pixel 131 is connected to the second driving signal output end 410 through the first pixel driving circuit 140, and the signals of the second driving signal output end 410 and the first driving signal output end 210 are different, so that the brightness and/or the on time of the first portion of the peep-preventing sub-pixel 131 and the second portion of the peep-preventing sub-pixel 131 are different. In the peep-proof mode, the display panel 100 presents peep-proof pictures with light and shade or flickering, so that the peep-proof effect of the display panel 100 is enhanced.
For example, referring to fig. 5, the second driving signal output terminal 410 and the first driving signal output terminal 210 have the same signal frequency and opposite waveforms, so that the on-time of the first portion of the peep-preventing sub-pixels 131 is different from the on-time of the second portion of the peep-preventing sub-pixels 131. The signal (OUT 1) of the second driving signal output terminal 410 and the signal (OUT 2) of the first driving signal output terminal 210 may be PWM (pulse width modulation) wave signals, and the signal (OUT 1) of the second driving signal output terminal 410 and the signal (OUT 2) of the first driving signal output terminal 210 are low-frequency signals, so as to ensure that the human eyes can see the flickering peep-proof picture. For example, the second driving signal output 410 signal and the first driving signal output 210 signal are two frames in period, and the ratio of high level to low level is 1. The waveforms of the signals at the second driving signal output end 410 and the first driving signal output end 210 are opposite, that is, when the signal at the first driving signal output end 210 is at a high level, the signal at the second driving signal output end 410 is at a low level, and when the signal at the first driving signal output end 210 is at a low level, the signal at the second driving signal output end 410 is at a high level.
The second driving signal output end 410 and the first driving signal output end 210 have the same frequency and opposite waveforms, so that the display panel 100 can present the peep-proof pictures with alternately flashing brightness in different areas, and the implementation is simpler.
Referring to fig. 6, the driving inverter module 400 includes a first transistor 420 and a second transistor 430, at least the first transistor 420 being a vertical double gate transistor. The first connection terminal and the first control terminal of the first transistor 420 are both connected to the first power supply terminal 310, the second connection terminal of the first transistor 420 is connected to the connection node a, and the connection node a and the second control terminal of the first transistor 420 are both connected to the second driving signal output terminal 410. A first connection terminal of the second transistor 430 is connected to the connection node a, a second connection terminal of the second transistor 430 is connected to the second power supply terminal 320, and a first control terminal of the second transistor 430 is connected to the first driving signal output terminal 210.
The driving inverter module 400 operates:
when the signal at the first driving signal output end 210 is a high level signal, the second transistor 430 is turned on, the power VGL of the second power source end 320 can be written into the second driving signal output end 410, and meanwhile, since the first control end of the first transistor 420 is controlled by the power VGH of the first power source end 310, the power VGH of the first power source end 310 can be written into the second driving signal output end 410 when the first transistor 420 is turned on, so that the low level of the second driving signal output end 410 is greater than the power VGL of the second power source end 320 and less than the power VGH of the first power source end 310;
When the signal at the first driving signal output terminal 210 is a low level signal, the second transistor 430 is turned off, and meanwhile, since the first control terminal of the first transistor 420 is controlled by the power VGH at the first power terminal 310, the first transistor 420 is turned on, and the power VGH at the first power terminal 310 can be written into the second driving signal output terminal 410, the high level of the second driving signal output terminal 410 is equal to the power VGH at the first power terminal 310.
The first driving signal output terminal 210 is converted into a signal with opposite waveforms through the first transistor 420 and the second transistor 430 and is output through the second driving signal output terminal 410, and the structure is simple and easy to implement.
In some embodiments, the width to length ratio of the channel of the second transistor 430 is greater than the width to length ratio of the channel of the first transistor 420. W is the channel width of the transistor, L is the channel length of the transistor, and the width-to-length ratio is W/L. For example, the width to length ratio of the channel of the second transistor 430 is greater than 10 times the width to length ratio of the channel of the first transistor 420.
The width-to-length ratio of the channel of the second transistor 430 is greater than that of the channel of the first transistor 420, and the larger the gap is, the closer the low level of the second driving signal output terminal 410 is to the power VGL of the second power supply terminal 320.
In some embodiments, the first transistor 420 and the second transistor 430 are each vertical double gate transistors. The driving module 200 further includes a control output terminal 220, wherein the voltage of the control output terminal 220 is VMG, and the voltage VMG of the control output terminal 220 is a variable voltage. The second control terminal of the second transistor 430 is connected to the control output terminal 220, and the control output terminal 220 is used for controlling the brightness of the second portion of the peep-preventing sub-pixel 131.
The driving inverter module 400 operates:
when the signal at the first driving signal output 210 is a low level signal, the second transistor 430 is turned off by the low level signal, and the first control terminal of the first transistor 420 is controlled by the power VGH at the first power terminal 310, the first transistor 420 is turned on, the power VGH at the first power terminal 310 can be written into the second driving signal output 410, but a portion of the leakage current exists in the second transistor 430 due to the voltage VMG at the control output 220, and the power VGH at the first power terminal 310 is pulled down by the power VGL at the second power terminal 320.
That is, by controlling the voltage VMG of the output terminal 220, the high level voltage of the second driving signal output terminal 410 can be controlled. Referring to fig. 7, VG is a first control terminal voltage of the second transistor 430, VD is a first connection terminal voltage of the second transistor 430, and VS is a second connection terminal voltage of the second transistor 430. As the voltage VMG of the control output 220 changes, the IDS-VGS curve of the second transistor 430 shifts left and right, so that the corresponding current IDS varies when VG-vs=0v. The larger the current IDS, the closer the high level voltage of the second driving signal output terminal 410 is to the VGL voltage value, the smaller the current IDS, the closer the high level voltage of the second driving signal output terminal 410 is to the VGH voltage value.
Referring to fig. 8, the first pixel driving circuit 140 includes a third transistor 141, a control terminal of the third transistor 141 is connected to the first driving signal output terminal 210 or the second driving signal output terminal 410, and a first connection terminal and a second connection terminal of the third transistor 141 are connected to a power source. As shown in fig. 9, vs is the voltage of the second connection terminal of the third transistor 141, ids is the current of the third transistor 141, and when the voltages of the control terminals of the third transistor 141 are different, the currents Ids of the third transistor 141 are different, and the luminance of the peep-preventing sub-pixel 131 is also different. That is, the first driving signal output terminal 210 or the second driving signal output terminal 410 controls the turn-on degree of the third transistor 141, the high level voltage of the first driving signal output terminal 210 is different from the high level voltage of the second driving signal output terminal 410, and the brightness of the peep-proof sub-pixel 131 is also different.
By controlling the voltage VMG at the output terminal 220, the high-level voltage of the second driving signal output terminal 410 can be adjusted, that is, by controlling the voltage VMG at the output terminal 220, the brightness of the second portion of the peep-preventing sub-pixel 131 can be controlled, so that the brightness of the second portion of the peep-preventing sub-pixel 131 is different from the brightness of the first portion of the peep-preventing sub-pixel 131. For example, the first power source terminal 310 has a power VGH of 15V, the second power source terminal 320 has a power VGL of-7V, the first driving signal output terminal 210 has a high voltage of 15V, the first driving signal output terminal 210 has a low voltage of-7V, the second driving signal output terminal 410 has a high voltage of 6V, and the second driving signal output terminal 410 has a low voltage of approximately-7V.
Referring to fig. 1, the odd unit row peep-preventing sub-pixels 131 are connected to the first driving signal output end 210 through the first pixel driving circuit 140, the even unit row peep-preventing sub-pixels 131 are connected to the second driving signal output end 410 through the first pixel driving circuit 140, and the unit row includes one or more rows of peep-preventing sub-pixels 131. Or the peep-proof sub-pixels 131 of the odd unit columns are connected with the first driving signal output end 210 through the first pixel driving circuit 140, the peep-proof sub-pixels 131 of the even unit columns are connected with the second driving signal output end 410 through the first pixel driving circuit 140, and the unit columns comprise one or more columns of peep-proof sub-pixels 131.
The first driving signal output terminal 210 and the second driving signal output terminal 410 control different cell rows or cell columns, so that the brightness of the different cell rows or cell columns is different, and the control mode is simpler.
Referring to fig. 1 and 10, the power module 300 further includes a third power terminal 330 and a fourth power terminal 340, wherein the voltage VDD of the third power terminal 330 is greater than the voltage VSS of the fourth power terminal 340.
The first pixel driving circuit 140 includes a third transistor 141, a control terminal of the third transistor 141 is connected to the first driving signal output terminal 210 or the second driving signal output terminal 410, a first connection terminal of the third transistor 141 is connected to the third power supply terminal 330, and a second connection terminal of the third transistor 141 is connected to the fourth power supply terminal 340 through the peep-preventing sub-pixel 131.
The pixel unit 130 further includes a display sub-pixel 132, and the display sub-pixel 132 is connected to the second pixel driving circuit 150. The second pixel driving circuit 150 at least includes a fourth transistor 151, a fifth transistor 152, and a storage capacitor 153, wherein a control terminal of the fourth transistor 151 is connected to the scan line 110, a first connection terminal of the fourth transistor 151 is connected to the data line 120, a second connection terminal of the fourth transistor 151 is connected to a control terminal of the fifth transistor 152, a first connection terminal of the fifth transistor 152 is connected to the third power supply terminal 330, a second connection terminal of the fifth transistor 152 is connected to the fourth power supply terminal 340 through the display sub-pixel 132, and the storage capacitor 153 is connected to a control terminal and the first connection terminal of the fifth transistor 152.
It should be appreciated that the second pixel driving circuit 150 may also include other transistors and capacitors to perform threshold voltage compensation and the like.
The display sub-pixel 132 and the peep-proof sub-pixel 131 share a power supply, and the structure of the display driving circuit is simpler.
Example two
The second embodiment differs from the first embodiment in that the power supply voltages of the first pixel driving circuits 140 of the odd cell rows and the even cell rows are different.
Referring to fig. 11, the power module 300 further includes a third power terminal 330, a fourth power terminal 340 and a fifth power terminal 350, wherein the voltage VDD of the third power terminal 330 and the voltage VDD of the fifth power terminal 350 are both greater than the voltage VSS of the fourth power terminal 340, and the voltage VDD of the third power terminal 330 and the voltage VDD of the fifth power terminal 350 are different.
The first pixel driving circuit 140 includes a third transistor 141, and a control terminal of the third transistor 141 is connected to the first driving signal output terminal 210 or the second driving signal output terminal 410. The first connection terminal of the third transistor 141 of the odd cell row is connected to the third power supply terminal 330, the first connection terminal of the third transistor 141 of the even cell row is connected to the fifth power supply terminal 350, and the second connection terminal of the third transistor 141 is connected to the fourth power supply terminal 340 through the peep-preventing sub-pixel 131.
The pixel unit 130 further includes a display sub-pixel 132, and the display sub-pixel 132 is connected to the second pixel driving circuit 150. The second pixel driving circuit 150 at least includes a fourth transistor 151, a fifth transistor 152, and a storage capacitor 153, wherein a control terminal of the fourth transistor 151 is connected to the scan line 110, a first connection terminal of the fourth transistor 151 is connected to the data line 120, a second connection terminal of the fourth transistor 151 is connected to a control terminal of the fifth transistor 152, a first connection terminal of the fifth transistor 152 is connected to the third power supply terminal 330, a second connection terminal of the fifth transistor 152 is connected to the fourth power supply terminal 340 through the display sub-pixel 132, and the storage capacitor 153 is connected to a control terminal and the first connection terminal of the fifth transistor 152.
As shown in fig. 12, vs is the voltage of the second connection terminal of the third transistor 141, and Ids is the current of the third transistor 141. When the voltages of the first connection terminals of the third transistors 141 are different, the currents Ids of the third transistors 141 are different, and the brightness of the peep-preventing sub-pixel 131 is also different. That is, the first driving signal output terminal 210 or the second driving signal output terminal 410 controls the turn-on degree of the third transistor 141, and the voltage difference between the first connection terminal and the second connection terminal of the third transistor 141 affects the current Ids of the third transistor 141, and when the voltage of the first connection terminal of the third transistor 141 in the odd cell row is different from the voltage of the first connection terminal of the third transistor 141 in the even cell row, the brightness of the peep-preventing sub-pixel 131 is also different.
The peep-proof sub-pixels 131 of the odd unit lines and the peep-proof sub-pixels 131 of the even unit lines have different brightness and alternately flash, so that visual fatigue can be more easily generated in strabismus due to the design, and the peep-proof effect of the display panel 100 is enhanced.
It should be noted that, the brightness of the peep-preventing sub-pixel 131 is also different by using the voltage of the first connection terminal of the third transistor 141 in the odd unit row and the voltage of the first connection terminal of the third transistor 141 in the even unit row, and the brightness of the peep-preventing sub-pixel 131 is also different by using the voltage VMG of the control output terminal 220, which can be applied simultaneously to increase the brightness difference between the peep-preventing sub-pixel 131 in the odd unit row and the peep-preventing sub-pixel 131 in the even unit row.
Example III
The display driving method in this embodiment is used in the display driving circuit disclosed in the first embodiment or the second embodiment. Referring to fig. 13 and 14, the display driving method includes:
s100: acquiring display modes of the display panel 100, wherein the display modes comprise a peep-proof mode and a wide view angle mode;
s200: when the display mode of the display panel 100 is the peep-proof mode, the first driving signal output end 210 of the driving module 200 is controlled to output a signal, and the second driving signal output end 410 of the driving inversion module 400 is controlled to output a signal, so that the brightness and/or the starting time of the first part of peep-proof sub-pixels 131 and the second part of peep-proof sub-pixels 131 are different;
s300: when the display mode of the display panel 100 is confirmed to be the wide viewing angle mode, the first driving signal output terminal 210 and the second driving signal output terminal 410 are controlled to stop outputting signals.
In this embodiment, the display modes include a peep-proof mode and a wide viewing angle mode, which can be switched by the driving module 200. Meanwhile, the second driving signal output terminal 410 and the first driving signal output terminal 210 are different in signal, so that the brightness and/or the on time of the first portion of the peep-proof sub-pixels 131 and the second portion of the peep-proof sub-pixels 131 are different. In the peep-proof mode, the display panel 100 presents peep-proof pictures with light and shade or flickering, so that the peep-proof effect of the display panel 100 is enhanced.
Specifically, in the wide viewing angle mode, the first driving signal output terminal 210, the control output terminal 220, and the second driving signal output terminal 410 stop outputting signals, and the third power supply terminal 330 and the fourth power supply terminal 340 may stop supplying power. In addition, if the fifth power terminal 350 is further provided, the fifth power terminal 350 also stops supplying power.
The privacy mode may include a normally bright privacy mode and a blinking privacy mode. In the normal-bright peep-proof mode, the first driving signal output end 210 stops outputting signals, the third power end 330 and the fourth power end 340 start power supply, and if the fifth power end 350 is further provided, the fifth power end 350 also starts power supply. The control output 220 is turned on, and the second portion of the peep-proof sub-pixels 131 are continuously turned on, and meanwhile, the user can control the brightness of the normally-on peep-proof through controlling the voltage VMG of the control output 220. In addition, the frequencies of the signals of the first driving signal output end 210 and the second driving signal output end 410 can be increased to light all the peep-proof sub-pixels 131, and the brightness of the first part of peep-proof sub-pixels 131 is the same as that of the second part of peep-proof sub-pixels 131 by controlling the voltage VMG voltage of the output end 220.
In the flicker prevention mode, the first driving signal output terminal 210, the control output terminal 220, and the second driving signal output terminal 410 output signals. The third power supply terminal 330 and the fourth power supply terminal 340 are powered on, and if a fifth power supply terminal 350 is further provided, the fifth power supply terminal 350 is also powered on. Meanwhile, the user can control the brightness of the peep-proof flicker by controlling the voltage VMG of the output terminal 220 to make the brightness of the first part of peep-proof sub-pixel 131 different from the brightness of the second part of peep-proof sub-pixel 131. The user can also control the brightness of the anti-peeping flicker through the voltage difference between the third power supply terminal 330 voltage VDD and the fifth power supply terminal 350 voltage VDD. In addition, the user can also adjust the flicker frequency of the anti-peeping flicker by controlling the frequency of the signals output by the first driving signal output end 210 and the second driving signal output end 410.
Example IV
Referring to fig. 15, the display device of the present embodiment includes a display panel 100 and a display driving circuit including the display driving circuits disclosed in the first and second embodiments. The display panel 100 includes a plurality of pixel units 130 arranged in an array, at least some of the pixel units 130 include peep-proof sub-pixels 131. The display driving circuit includes a driving module 200, a power module 300, and a driving inversion module 400, and the driving module 200 may be disposed on the display panel 100 or a main board, and the driving module 200, the power module 300, and the driving inversion module 400 may be disposed on the main board. The first driving signal output end 210 of the display driving circuit is connected to the first portion of the peep-proof sub-pixel 131, and the second driving signal output end 410 of the display driving circuit is connected to the second portion of the peep-proof sub-pixel 131.
The display device includes a display driving circuit, in which the driving module 200 includes a first driving signal output end 210, the first portion of the peep-preventing sub-pixel 131 is connected to the first driving signal output end 210 through the first pixel driving circuit 140, the power module 300 includes a first power end 310 and a second power end 320, the voltage VGH of the first power end 310 is greater than the voltage VGL of the second power end 320, the driving inversion module 400 is connected to the first driving signal output end 210, the first power end 310 and the second power end 320, the driving inversion module 400 includes a second driving signal output end 410, the second portion of the peep-preventing sub-pixel 131 is connected to the second driving signal output end 410 through the first pixel driving circuit 140, and the signals of the second driving signal output end 410 and the first driving signal output end 210 are different, so that the brightness and/or the on time of the first portion of the peep-preventing sub-pixel 131 and the second portion of the peep-preventing sub-pixel 131 are different. In the peep-proof mode, the display panel 100 presents peep-proof pictures with light and shade or flickering, so that the peep-proof effect of the display panel 100 is enhanced.
The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly, and may be fixedly attached, detachably attached, or integrally formed, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, reference to the terms "some embodiments," "exemplary," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that modifications, alternatives and variations may be made to the embodiments by those skilled in the art within the scope of the application, which is therefore intended to be covered by the appended claims and their description.
Claims (8)
1. A display driving circuit for driving a display panel, the display panel comprising a plurality of pixel units arranged in an array, at least some of the pixel units comprising peep-proof sub-pixels, the display driving circuit comprising:
the driving module comprises a first driving signal output end, the display panel further comprises a first pixel driving circuit, and a first part of peep-proof sub-pixels are connected with the first driving signal output end through the first pixel driving circuit;
the power module comprises a first power end and a second power end, wherein the voltage of the first power end is larger than that of the second power end;
the driving inversion module is connected with the first driving signal output end, the first power end and the second power end, and comprises a second driving signal output end, a second part of peep-proof sub-pixels are connected with the second driving signal output end through the first pixel driving circuit, and the signals of the second driving signal output end and the signals of the first driving signal output end are different, so that the brightness and/or the opening time of the first part of peep-proof sub-pixels and the second part of peep-proof sub-pixels are different;
The driving inversion module comprises a first transistor and a second transistor, the first transistor and the second transistor are vertical double-gate transistors, a first connecting end and a first control end of the first transistor are connected with the first power supply end, a second connecting end of the first transistor is connected with a connecting node, and the connecting node and a second control end of the first transistor are connected with the second driving signal output end;
the first connecting end of the second transistor is connected with the connecting node, the second connecting end of the second transistor is connected with the second power supply end, the first control end of the second transistor is connected with the first driving signal output end, the driving module further comprises a control output end, the second control end of the second transistor is connected with the control output end, and the control output end is used for controlling the brightness of the second part of peeping-preventing sub-pixels.
2. The display driver circuit of claim 1, wherein the second drive signal output signal and the first drive signal output signal have the same frequency and opposite waveforms such that the first portion of the peep-preventing sub-pixels and the second portion of the peep-preventing sub-pixels have different on-times.
3. The display driver circuit of claim 1, wherein the second transistor channel has a greater aspect ratio than the first transistor channel.
4. The display drive circuit according to claim 1, wherein odd-numbered unit rows of the peep-preventing subpixels are connected with the first drive signal output terminal through the first pixel drive circuit, even-numbered unit rows of the peep-preventing subpixels are connected with the second drive signal output terminal through the first pixel drive circuit, and the unit rows include one or more rows of the peep-preventing subpixels; or (b)
The peep-proof sub-pixels of the odd unit columns are connected with the first driving signal output end through the first pixel driving circuit, the peep-proof sub-pixels of the even unit columns are connected with the second driving signal output end through the first pixel driving circuit, and the unit columns comprise one or more columns of peep-proof sub-pixels.
5. The display driver circuit of claim 4, wherein the power module further comprises a third power terminal and a fourth power terminal, the third power terminal having a voltage greater than the fourth power terminal;
The first pixel driver comprises a third transistor, a control end of the third transistor is connected with the first driving signal output end or the second driving signal output end, a first connecting end of the third transistor is connected with the third power end, and a second connecting end of the third transistor is connected with the fourth power end through the peep-proof sub-pixel;
the pixel unit further comprises a display sub-pixel, the display sub-pixel is connected with a second pixel driving circuit, the second pixel driving circuit at least comprises a fourth transistor, a fifth transistor and a storage capacitor, the control end of the fourth transistor is connected with a scanning line, the first connection end of the fourth transistor is connected with a data line, the second connection end of the fourth transistor is connected with the control end of the fifth transistor, the first connection end of the fifth transistor is connected with the third power supply end, the second connection end of the fifth transistor is connected with the fourth power supply end through the display sub-pixel, and the storage capacitor is connected with the control end and the first connection end of the fifth transistor.
6. The display driver circuit according to claim 4, wherein the power supply module further includes a third power supply terminal, a fourth power supply terminal, and a fifth power supply terminal, the voltage of the third power supply terminal and the voltage of the fifth power supply terminal each being greater than the voltage of the fourth power supply terminal, the voltage of the third power supply terminal and the voltage of the fifth power supply terminal being different;
The first pixel driver includes a third transistor, a control end of the third transistor is connected to the first driving signal output end or the second driving signal output end, a first connection end of the third transistor of the odd unit row is connected to the third power supply end, a first connection end of the third transistor of the even unit row is connected to the fifth power supply end, and a second connection end of the third transistor is connected to the fourth power supply end through the peep-proof sub-pixel;
the pixel unit further comprises a display sub-pixel, the display sub-pixel is connected with a second pixel driving circuit, the second pixel driving circuit at least comprises a fourth transistor, a fifth transistor and a storage capacitor, the control end of the fourth transistor is connected with a scanning line, the first connection end of the fourth transistor is connected with a data line, the second connection end of the fourth transistor is connected with the control end of the fifth transistor, the first connection end of the fifth transistor is connected with the third power supply end, the second connection end of the fifth transistor is connected with the fourth power supply end through the display sub-pixel, and the storage capacitor is connected with the control end and the first connection end of the fifth transistor.
7. A display driving method for a display driving circuit according to any one of claims 1 to 6, comprising:
acquiring a display mode of a display panel, wherein the display mode comprises a peep-proof mode and a wide view angle mode;
when the display mode of the display panel is confirmed to be the peep-proof mode, controlling a first driving signal output end of the driving module to output signals and controlling a second driving signal output end of the driving inversion module to output signals, so that the brightness and/or the starting time of the peep-proof sub-pixels of the first part are different from those of the peep-proof sub-pixels of the second part;
and when the display mode of the display panel is confirmed to be the wide-viewing angle mode, controlling the first driving signal output end and the second driving signal output end to stop outputting signals.
8. A display device, comprising:
the display panel comprises a plurality of pixel units arranged in an array, and at least part of the pixel units comprise peep-proof sub-pixels;
the display driving circuit according to any one of claims 1 to 6, wherein a first driving signal output end of the display driving circuit is connected to a first portion of the peep-preventing sub-pixels, and a second driving signal output end of the display driving circuit is connected to a second portion of the peep-preventing sub-pixels.
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