CN117116224A - Display panel and display device - Google Patents
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- CN117116224A CN117116224A CN202311118265.7A CN202311118265A CN117116224A CN 117116224 A CN117116224 A CN 117116224A CN 202311118265 A CN202311118265 A CN 202311118265A CN 117116224 A CN117116224 A CN 117116224A
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000007423 decrease Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 12
- 239000000758 substrate Substances 0.000 description 12
- 239000004973 liquid crystal related substance Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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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
- G09G3/34—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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- 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
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
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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
- G09G3/34—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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a display panel and a display device, which comprise a time sequence control circuit, a scanning driving circuit and a pixel unit, wherein the time sequence control circuit and the scanning driving circuit are arranged in a non-display area, the pixel unit is arranged in the display area, the time sequence control circuit is connected with the scanning driving circuit through at least one clock signal line, and the scanning driving circuit is used for outputting scanning signals to the pixel unit through the scanning lines according to clock signals so as to control the pixel unit to display images. The display panel also comprises a temperature detection unit and an adjustment unit, wherein the temperature detection unit is arranged in the area where the clock signal line is positioned and is used for detecting the temperature of the area where the clock signal line is positioned and outputting a temperature detection signal according to a detection result, and the adjustment unit is connected with the temperature detection unit, the time sequence control circuit and the clock signal line and is used for adjusting the resistance value of the clock signal line according to the temperature detection signal so as to control the temperature of the area where the clock signal line is positioned to be lower than a preset threshold value.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display device.
Background
With the development of display technology, the refresh rate of the display gradually increases, but when the refresh rate increases, a transmission line for transmitting clock signals is very easy to generate heat at a high temperature due to a larger load, and liquid crystal molecules in the liquid crystal display panel are very easy to generate polarization at a high temperature, so that the display effect is affected.
Therefore, how to maintain the temperature of the region where the clock signal transmission line is located in a lower range to prevent the polarization phenomenon affecting the liquid crystal molecules is a problem to be solved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present application provides a display panel and a display device capable of effectively controlling the temperature of the area where the clock signal is located.
The application provides a display panel, which comprises a time sequence control circuit, a scanning driving circuit and a pixel unit, wherein the time sequence control circuit and the scanning driving circuit are arranged in a non-display area, the pixel unit is arranged in the display area, the time sequence control circuit is connected with the scanning driving circuit through at least one clock signal line and is used for outputting a clock signal to the scanning driving circuit through the clock signal line, and the scanning driving circuit is used for outputting a scanning signal to the pixel unit through a scanning line according to the clock signal so as to control the pixel unit to receive a data signal for image display through a data line for image display. The display panel also comprises a temperature detection unit and an adjustment unit, wherein the temperature detection unit is arranged in the area where the clock signal line is positioned and is used for detecting the temperature of the area where the clock signal line is positioned and outputting a temperature detection signal according to a detection result, and the adjustment unit is connected with the temperature detection unit, the time sequence control circuit and the clock signal line and is used for adjusting the resistance value of the clock signal line according to the temperature detection signal so as to control the temperature of the area where the clock signal line is positioned to be lower than a preset threshold value.
Optionally, the scan driving circuit includes a plurality of scan driving units and at least one virtual scan driving unit, where the virtual scan driving unit is sequentially connected with the plurality of scan driving units in cascade, and the virtual scan driving unit is configured to receive the clock signal from the clock signal line and output an enable signal to the scan driving unit cascaded therewith according to the clock signal, so that the scan driving unit cascaded therewith outputs the scan signal according to the clock signal. The virtual scanning driving unit outputs a virtual scanning signal according to the clock signal, the temperature detecting unit is arranged in the virtual scanning driving unit, the virtual scanning signal changes according to the temperature detected by the temperature detecting unit, and the virtual scanning signal is used as the temperature detecting signal to be output to the adjusting unit.
Optionally, the virtual scanning driving unit includes a thermistor, a driving switch tube, a pull-up module and an output control node, where the thermistor is the temperature detecting unit, a gate of the driving switch tube is connected to the output control node, a source of the driving switch tube is connected to the clock signal line through the thermistor, and a drain of the driving switch tube is connected to the adjusting unit. The pull-up module is connected to the output control node and used for pulling up the potential of the output control node so as to control the drive switch tube to be conducted, and the thermistor adjusts the voltage of the output virtual scanning signal by adjusting the internal resistance value according to the detected temperature.
Alternatively, when the thermistor detects a temperature rise, a resistance value of the thermistor increases to control a voltage of the dummy scan signal transmitted to the adjustment unit to decrease.
Optionally, the adjusting unit includes a control end, a first adjusting module, a second adjusting module and a third adjusting module, where the control end is connected to the virtual scanning driving unit and is used to receive the virtual scanning signal, and the first adjusting module, the second adjusting module and the third adjusting module are connected to the control end. When the thermistor detects that the temperature is greater than the preset threshold, the first adjusting module, the second adjusting module and the third adjusting module are selectively connected to the clock signal line and the time sequence control circuit under the control of the control end and used for increasing the resistance in the clock signal line.
Optionally, the first adjustment module includes a first switching tube and a first resistor, the second adjustment module includes a second switching tube and a second resistor, and the adjustment module includes a third switching tube and a third resistor. The first resistor, the second resistor and the third resistor are sequentially connected in series, the grid electrode of the first switching tube is connected to the control end, the source electrode and the drain electrode of the first switching tube are respectively connected to the two ends of the first resistor, the grid electrode of the second switching tube is connected to the control end, the source electrode and the drain electrode of the second switching tube are respectively connected to the two ends of the second resistor, the grid electrode of the third switching tube is connected to the control end, and the source electrode and the drain electrode of the third switching tube are respectively connected to the two ends of the third resistor. When the thermistor detects that the temperature is greater than a preset threshold value and gradually rises, the first switching tube, the second switching tube and the third switching tube are sequentially cut off under the control of the control end, so that the first resistor to the third resistor are controlled to be sequentially connected to the clock signal line.
Optionally, the first switching tube has a first threshold voltage, the second switching tube has a second threshold voltage, the third switching tube has a third threshold voltage, the first threshold voltage is greater than the second threshold voltage, and the second threshold voltage is greater than the third threshold voltage.
Optionally, when the thermistor has a first resistance value, the virtual scan driving unit outputs the virtual scan signal having a first voltage, the first voltage is greater than the first threshold voltage, the first switching tube, the second switching tube and the third switching tube are turned on, and the clock signal is transmitted to the clock signal line through the first switching tube, the second switching tube and the third switching tube. When the thermistor rises to a second resistance value, the virtual scanning driving unit outputs the virtual scanning signal with a second voltage, the second voltage is smaller than the first threshold voltage and larger than the second threshold voltage and the third threshold voltage, the first switching tube is turned off, the second switching tube and the third switching tube are turned on, and the clock signal is transmitted to the clock signal line through the first resistor, the second switching tube and the third switching tube. When the thermistor rises to a third resistance value, the virtual scanning driving unit outputs the virtual scanning signal with a third voltage, the third voltage is smaller than the second threshold voltage and larger than the third threshold voltage, the first switching tube and the second switching tube are turned off, the third switching tube is turned on, and the clock signal is transmitted to the clock signal line through the first resistor, the second resistor and the third switching tube. When the thermistor rises to a fourth resistance value, the virtual scan driving unit outputs the virtual scan signal having a fourth voltage, the fourth voltage is smaller than the third threshold voltage, the first switching tube, the second switching tube and the third switching tube are turned off, and the clock signal is transmitted to the clock signal line through the first resistor, the second resistor and the third resistor.
Optionally, the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value sequentially increase, and the first voltage, the second voltage, the third voltage, and the fourth voltage sequentially decrease.
The application also provides a display device which comprises a power supply module and the display panel, wherein the power supply module is used for providing a driving power supply for image display of the display panel.
Compared with the prior art, the temperature detection unit is arranged in the area where the clock signal line is located, and the resistance in the clock signal line is adjusted according to the temperature detection result so as to reduce the current in the clock signal line, so that the situation of reducing the heating of the clock signal line can be effectively avoided. Meanwhile, a virtual scanning driving unit in the scanning driving circuit is used for setting a temperature detection unit, and a virtual scanning signal output by the virtual scanning driving unit is used as a temperature detection signal, so that the space can be effectively saved, and the temperature detection effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;
FIG. 2 is a schematic side view of the display panel of FIG. 1;
FIG. 3 is a schematic plan layout of the array substrate in FIG. 2;
FIG. 4 is a schematic diagram of an equivalent circuit of the adjusting unit in FIG. 3;
fig. 5 is an equivalent circuit schematic diagram of an adjusting unit according to a second embodiment;
FIG. 6 is a block diagram of the scan driving circuit in FIG. 3;
FIG. 7 is a schematic diagram of an equivalent circuit of the virtual scan driving unit in FIG. 6;
fig. 8 is a schematic diagram of a feedback adjustment circuit of the virtual scan driving unit in fig. 7.
Reference numerals:
the display device comprises a display device 100, a display panel 10, a power module 20, a supporting frame 30, a display area 10a, a non-display area 10B, an array substrate 10c, a counter substrate 10D, a display medium layer 10e, M data lines S1-Sm, n scanning lines G1-Gn, a pixel unit P, a time sequence control circuit 11, a data driving circuit 12, a scanning driving circuit 13, a clock signal line 14, a backlight module 15, a temperature detection unit 16, an adjusting unit 17, a control end K, a first adjusting module 171, a first switching tube T1, a first resistor R1, a second adjusting module 172, a scanning driving unit 13A, a virtual scanning driving unit 13B, a virtual end D, a thermistor Rh, a driving switching tube M, an output control node Q, a pull-up module 131, a pull-down module 132, a second switching tube T2, a third switching tube T3, a second resistor R2 and a third resistor R3.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order.
Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application. As shown in fig. 1, the display device 100 includes a display panel 10, a power module 20 and a supporting frame 30, wherein the display panel 10 and the power module 20 are fixed on the supporting frame 30, and the power module 20 is disposed on a back surface of the display panel 10, i.e. a non-display surface of the display panel 10. The power module 20 is used for providing power voltage for the display panel 10 to display images, and the support frame 30 provides fixing and protecting functions for the display panel 10 and the power module 20. In other embodiments of the present application, the display device 100 may not need to be provided with the supporting frame 30, for example, a portable electronic device, such as a mobile phone, a tablet computer, etc.
Referring to fig. 2, fig. 2 is a schematic side view of the display panel in fig. 1.
As shown in fig. 2, the display panel 10 includes a display region 10a for an image and a non-display region 10b. The display area 10a is used for performing image display, the non-display area 10b is disposed around the display area 10a to provide other auxiliary components or modules, specifically, the display panel 10 includes an array substrate 10c and an opposite substrate 10d, and a display medium layer 10e sandwiched between the array substrate 10c and the opposite substrate 10d, and driving elements disposed on the array substrate 10c and the opposite substrate 10d generate corresponding electric fields according to Data signals (Data), so as to drive the display medium layer 10e to emit light with corresponding brightness, so as to perform image display. In this embodiment, the display medium in the display medium layer 10e may be a material such as liquid crystal molecules, micro LEDs, mini LEDs, etc.
Taking a liquid crystal display panel as an example, in which liquid crystal molecules are in the display medium layer 10e, the liquid crystal molecules deflect light rays having a predetermined brightness to perform image display. The display panel 10 further includes a backlight module 15 (Back light Module, BM), the backlight module 15 is configured to provide display light to the display area 10a of the display panel 10, and the display panel 10 emits corresponding light according to the image signal to be displayed to perform image display. The display panel 10 further includes other elements or components, such as a signal processor module and a signal sensing module.
Referring to fig. 3, fig. 3 is a schematic plan layout of the array substrate in fig. 2.
The display panel 10 includes a timing control circuit 11, a data driving circuit 12, and a scan driving circuit 13, the timing control circuit 11 receiving an image signal representing image information, a horizontal synchronization signal, and a vertical synchronization signal from an external signal source, and outputting a clock signal for controlling the scan driving circuit 13, a scan control signal, and a data control signal for controlling the data driving circuit 12.
The scan driving circuit 13 receives the scan control signal output from the timing control circuit 11 and outputs the scan signal to the display area 10a according to the scan control signal, and the Data driving circuit 12 receives the Data control signal output from the timing control circuit 11 and outputs the Data signal (Data) to the display area 10a according to the Data control signal for cooperatively driving the pixel units (not identified) in the display area 10a to perform image display.
In the present embodiment, the circuit elements in the scan driving circuit 13 and the pixel units P in the array substrate 10c are fabricated in the same process in the array substrate 10c, i.e. GOA (Gate Driver on Array) technology.
The timing control circuit 11 is connected to the scan driving circuit 13 through a clock signal line 14, and is configured to transmit a clock signal to the scan driving circuit 13 through the clock signal line 14. However, since the refresh rate of the display panel 10 is gradually increased, the clock signal line 14 is generally loaded more, and the temperature is excessively high, thereby causing a liquid crystal polarization phenomenon to affect the display effect.
The display panel 10 further includes a temperature detecting unit 16 and an adjusting unit 17, wherein the temperature detecting unit 16 is disposed in an area where the clock signal line 14 is arranged, and is used for detecting a temperature change in the area, and the temperature adjusting unit is connected between the timing control circuit 11 and the scan driving circuit 13 through the clock signal line 14, and is used for adjusting a current in the clock signal line 14 according to a detection result of the temperature detecting unit 16, so as to avoid a line heating caused by an excessive current, and further to cause a liquid crystal polarization phenomenon.
Referring to fig. 4, fig. 4 is an equivalent circuit schematic diagram of the adjusting unit in fig. 3.
As shown in fig. 4, the adjusting unit 17 includes at least two first adjusting modules 171 connected in series, the first adjusting modules 171 include a first switching tube T1 and a first resistor R1, the first resistor R1 is connected between the clock signal line 14 and the timing control circuit 11, the first switching tube T1 and the first resistor R1 are connected in parallel, that is, a gate of the first switching tube T1 is connected to the control terminal K, and a source and a drain are respectively connected to the first resistor R1. The number of the first resistors R1 connected in series is adjusted by controlling the on and off of the first switching transistor T1, thereby adjusting the magnitude of the current in the clock signal line 14.
When the temperature detecting unit 16 detects that the temperature is within the preset range, that is, is less than the preset threshold value, the first switching tube T1 in each first adjusting module 171 is turned on to control the clock signal to be transmitted to the clock signal line 14 through the first switching tube T1, and when the temperature detecting unit 16 detects that the temperature is greater than the threshold temperature, the at least one first switching tube T1 is controlled to be turned off to control the at least one first resistor R1 to be connected to the clock signal line 14, so that the resistance value in the clock signal line 14 is increased, and the current and the line heating are reduced.
In an exemplary embodiment, the threshold temperature may be set between 45 ℃ and 50 ℃, although other temperatures may be set according to specific requirements of the display panel, which is not limited by the present application.
Referring to fig. 5, fig. 5 is an equivalent circuit schematic diagram of an adjusting unit according to a second embodiment.
As shown in fig. 5, the adjusting unit 17 includes at least two first adjusting modules 171, and the plurality of first adjusting modules 171 are connected to the clock signal line 14 in parallel for adjusting the magnitude of the current in the clock signal line 14. The first adjusting module 171 includes a first switch tube T1 and a first resistor R1, where a gate of the first switch tube T1 is connected to the control end K, a source of the first switch tube T1 is connected to the timing control circuit 11, and a drain of the first switch tube T1 is connected to the first resistor R1, and is used for being turned on under the control of the control end K, so as to transmit a clock signal output by the timing control circuit 11 to the scan driving circuit 13 through the first resistor R1 and the clock signal line 14.
The adjusting unit 17 further includes a second adjusting module 172, where the second adjusting module 172 is connected in parallel with the first adjusting module 171, the second adjusting module 172 includes a first switching tube T1, a gate of the first switching tube T1 is connected to the control end K, a source of the first switching tube T1 is connected to the timing control circuit 11, and a drain of the first switching tube T1 is connected to the scan driving circuit 13 via the clock signal line 14 and is used for being turned on under the control of the control end K to transmit the clock signal to the scan driving circuit 13 via the clock signal line 14.
That is, when the temperature detecting unit 16 detects that the temperature is within the preset range, the second adjusting module 172 is turned on, so that the adjusting unit 17 does not increase the resistance in the clock signal line, and when the temperature detecting unit 16 detects that the temperature is greater than the threshold temperature, the at least one first adjusting module 171 is controlled to be turned on to increase the resistance value in the line, reduce the current in the clock signal line 14, and thereby reduce the heat generation condition of the clock signal line 14.
Referring to fig. 6, fig. 6 is a block diagram of the scan driving circuit in fig. 3.
As shown in fig. 6, the scan driving circuit 13 includes a plurality of scan driving units 13A and at least one dummy scan driving unit 13B, and the dummy scan driving unit 13B is configured to receive a clock signal from the clock signal line 14 and output an enable signal to the scan driving unit 13A cascaded therewith according to the clock signal, so that the scan driving unit 13A cascaded therewith can output a scan signal according to the clock signal.
The virtual scan driving unit 13B also outputs a virtual scan signal according to the clock signal, the temperature detecting unit 16 is disposed in the virtual scan driving unit, the virtual scan signal changes according to the temperature detected by the temperature detecting unit 16, and the virtual scan signal is output as a temperature detecting signal to the adjusting unit 17.
The scan driving unit 13A is configured to receive a clock signal from the clock signal line 14 and output a scan signal in accordance with the clock signal to control the pixel units in the display area 10a to receive data signals for image display to perform image display.
Referring to fig. 7, fig. 7 is a schematic diagram of an equivalent circuit of the virtual scan driving unit in fig. 6.
As shown in fig. 7, the virtual scan driving unit 13B includes a thermistor Rh, a driving switch tube M, a pull-up module 131, a pull-down module 132, and an output control node Q, wherein a gate of the driving switch tube M is connected to the output control node Q, a source of the driving switch tube M is connected to the clock signal line 14 via the thermistor Rh, and a drain of the driving switch tube M is connected to the virtual terminal D.
The pull-up module 131 and the pull-down module 132 are connected to the output control node Q, and the pull-up module 131 is configured to pull up the potential of the output control node Q to control the driving switch M to be turned on, and when the driving switch M is turned on, the clock signal in the clock signal line 14 is transmitted to the driving switch M through the thermistor Rh and is transmitted to the virtual terminal D through the second node Q2. The pull-down module 132 is configured to pull down the potential of the output control node Q to control the driving switch M to be turned off, thereby controlling the driving switch M to stop receiving the clock signal.
Here, the thermistor Rh may be a positive coefficient thermistor whose resistance value increases with an increase in temperature, and thus, a change in temperature around the clock signal line 14 affects a change in resistance value of the thermistor Rh. When the ambient temperature of the dummy scan driving unit 13B rises, the resistance of the thermistor Rh rises, and the current flowing through the thermistor Rh decreases, so that the voltage in the dummy scan signal output by the dummy scan driving unit 13B decreases.
Referring to fig. 8, fig. 8 is a schematic diagram of a feedback adjustment circuit of the virtual scan driving unit in fig. 7.
As shown in fig. 8, the output end of the virtual scan driving unit 13B is electrically connected to the control end K of the adjusting unit, that is, the virtual end D is connected to the control end K to control the virtual scan driving unit 13B to output a virtual scan signal to the control end K, so as to directly control the adjusting unit 17 to adjust the internal resistance value change.
The adjusting unit 17 includes a first adjusting module 171, a second adjusting module 172, and a third adjusting module 173, wherein the first adjusting module 171, the second adjusting module 172, and the third adjusting module 173 are connected in series between the clock signal line 14 and the timing control circuit 11. The first adjusting module 171 includes a first switching tube T1 and a first resistor R1, where a gate of the first switching tube T1 is connected to the control end K, and a source and a drain of the first switching tube T1 are respectively connected to two ends of the first resistor R1, so as to be turned on under the control of the control end K to short the first resistor R1, so as to control a clock signal to be transmitted to the second adjusting module 172 through the first switching tube T1, and when the first switching tube T1 is turned off, the clock signal is transmitted to the second adjusting module 172 through the first resistor R1.
The second adjusting module 172 includes a second switching tube T2 and a second resistor R2, where a gate of the second switching tube T2 is connected to the control end K, and a source and a drain of the second switching tube T2 are respectively connected to two ends of the second resistor R2, so as to be turned on under the control of the control end K to short the second resistor R2, so as to control the clock signal to be transmitted to the third adjusting module 173 through the second switching tube T2, and when the second switching tube T2 is turned off, the clock signal is transmitted to the third adjusting module 173 through the second resistor R2.
The third adjusting module 173 includes a third switching tube T3 and a third resistor R3, where a gate of the third switching tube T3 is connected to the control end K, a source and a drain of the third switching tube T3 are connected to the third resistor R3, and are used for being turned on under the control of the control end K, shorted with the third resistor R3, and used for controlling a clock signal to be transmitted to the clock signal line 14 through the third switching tube T3 and to be transmitted to the scan driving circuit 13 through the clock signal line 14, and when the third switching tube T3 is turned off, the clock signal is transmitted to the clock signal line 14 through the third resistor R3.
The first switching tube T1 has a first threshold voltage Th1, the second switching tube T2 has a second threshold voltage Th2, the third switching tube T3 has a third threshold voltage Th3, the first threshold voltage Th1 is greater than the second threshold voltage Th2, and the second threshold voltage Th2 is greater than the third threshold voltage Th3.
When the ambient temperature of the virtual scan driving unit 13B is the first temperature, the thermistor Rh has a first resistance value, that is, when the thermistor Rh is located at the first resistance value under the influence of the temperature, the virtual scan driving unit 13B outputs a first virtual scan signal having a first voltage V1 to control the first switching tube T1, the second switching tube T2 and the third switching tube T3 to be turned on, and the clock signal is transmitted to the clock signal line 14 through the first switching tube T1, the second switching tube T2 and the third switching tube T3. That is, the first, second and third threshold voltages Vh1, vh2 and Vh3 are smaller than the first voltage V1, so that the first, second and third switching transistors T1, T2 and T3 are all in a conductive state when the first virtual scan signal having the first voltage V1 is output.
When the ambient temperature of the dummy scan driving unit 13B rises to the second temperature, the thermistor Rh has a second resistance value, and the dummy scan driving unit 13B outputs a second dummy scan signal having a second voltage V2 to control the first switching transistor T1 to be turned off, and controls the second switching transistor T2 and the third switching transistor T3 to be turned on, for controlling the first resistor R1 to be connected in series with the clock signal line 14 to increase the resistance value of the clock signal line 14, thereby reducing the current in the clock signal line 14. That is, the second voltage V2 is smaller than the first threshold voltage Vh1, and the second voltage V2 is larger than the second threshold voltage Vh2 and the third threshold voltage Vh3 to control the first switching tube T1 to be in an off state and control the second switching tube T2 and the third switching tube T3 to be in an on state.
When the ambient temperature of the dummy scan driving unit 13B rises to the third temperature, the thermistor Rh has a third resistance value, and the dummy scan driving unit 13B outputs a third dummy scan signal having a third voltage V3 to control the first switching tube T1 and the second switching tube T2 to be turned off and the third switching tube T3 to be turned on, for controlling the first resistor R1 and the second resistor R2 to be connected in series with the clock signal line 14 to increase the resistance value of the clock signal line 14, thereby reducing the current in the clock signal line 14. That is, the third voltage V3 is greater than the third threshold voltage Vh3, and the third voltage V3 is less than the first threshold voltage Vh1 and the second threshold voltage Vh2 to control the first switching tube T1 and the second switching tube T2 to be in an off state and control the third switching tube T3 to be in an on state.
When the ambient temperature of the dummy scan driving unit 13B rises to the fourth temperature, the thermistor Rh has a fourth resistance value, and the dummy scan driving unit 13B outputs a fourth dummy scan signal having a fourth voltage V4 to control the first switching tube T1, the second switching tube T2 and the third switching tube T3 to be turned off, so that the first resistor R1, the second resistor R2 and the third resistor R3 are connected in series with the clock signal line 14 to increase the resistance value of the clock signal line 14, thereby reducing the current in the clock signal line 14 and reducing the line heat. That is, the first threshold voltage Vh1, the second threshold voltage Vh2 and the third threshold voltage Vh3 are all greater than the fourth voltage V4, so as to control the first switching tube T1, the second switching tube T2 and the third switching tube T3 to be in the off state.
The temperature detection unit 16 is arranged in the area where the clock signal line is located, and the resistance in the clock signal line is adjusted according to the temperature detection result so as to reduce the current in the clock signal line, so that the situation of reducing the heating of the clock signal line can be effectively avoided. Meanwhile, the temperature detection unit 16 is arranged by using a virtual scanning driving unit in the scanning driving circuit, and a virtual scanning signal output by the virtual scanning driving unit is used as a temperature detection signal, so that the space can be effectively saved, and the temperature detection effect can be improved.
It is to be understood that the application is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (10)
1. The display panel comprises a time sequence control circuit, a scanning driving circuit and a pixel unit, wherein the time sequence control circuit and the scanning driving circuit are arranged in a non-display area, the pixel unit is arranged in the display area, the time sequence control circuit is connected with the scanning driving circuit through at least one clock signal line and is used for outputting a clock signal to the scanning driving circuit through the clock signal line, and the scanning driving circuit is used for outputting a scanning signal to the pixel unit through a scanning line according to the clock signal so as to control the pixel unit to receive a data signal for image display through a data line for image display;
the display panel is characterized by further comprising a temperature detection unit and an adjustment unit, wherein the temperature detection unit is arranged in an area where the clock signal line is located and is used for detecting the temperature of the area where the clock signal line is located and outputting a temperature detection signal according to a detection result, and the adjustment unit is connected with the temperature detection unit, the time sequence control circuit and the clock signal line and is used for adjusting the resistance value of the clock signal line according to the temperature detection signal so as to control the temperature of the area where the clock signal line is located to be lower than a preset threshold value.
2. The display panel according to claim 1, wherein the scan driving circuit includes a plurality of scan driving units and at least one dummy scan driving unit, the dummy scan driving unit being sequentially cascade-connected with the plurality of scan driving units, the dummy scan driving unit being configured to receive the clock signal from the clock signal line and output an enable signal to the scan driving unit cascade-connected therewith according to the clock signal, so that the scan driving unit cascade-connected therewith outputs the scan signal according to the clock signal;
the virtual scanning driving unit outputs a virtual scanning signal according to the clock signal, the temperature detecting unit is arranged in the virtual scanning driving unit, the virtual scanning signal changes according to the temperature detected by the temperature detecting unit, and the virtual scanning signal is used as the temperature detecting signal to be output to the adjusting unit.
3. The display panel according to claim 2, wherein the virtual scan driving unit includes a thermistor, a driving switching tube, a pull-up module, and an output control node, the thermistor is the temperature detecting unit, a gate of the driving switching tube is connected to the output control node, a source of the driving switching tube is connected to the clock signal line via the thermistor, and a drain of the driving switching tube is connected to the adjusting unit;
the pull-up module is connected to the output control node and used for pulling up the potential of the output control node so as to control the drive switch tube to be conducted, and the thermistor adjusts the voltage of the output virtual scanning signal by adjusting the internal resistance value according to the detected temperature.
4. The display panel of claim 3, wherein,
when the thermistor detects a temperature rise, a resistance value of the thermistor increases to control a voltage of the dummy scan signal transmitted to the adjustment unit to decrease.
5. The display panel according to claim 3 or 4, wherein the adjustment unit includes a control end and a first adjustment module, a second adjustment module and a third adjustment module, the control end is connected to the virtual scan driving unit and is used for receiving the virtual scan signal, and the first adjustment module, the second adjustment module and the third adjustment module are connected to the control end;
when the thermistor detects that the temperature is greater than the preset threshold, the first adjusting module, the second adjusting module and the third adjusting module are selectively connected to the clock signal line and the time sequence control circuit under the control of the control end and used for increasing the resistance in the clock signal line.
6. The display panel of claim 5, wherein the first adjustment module comprises a first switching tube and a first resistor, the second adjustment module comprises a second switching tube and a second resistor, and the adjustment module comprises a third switching tube and a third resistor;
the first resistor, the second resistor and the third resistor are sequentially connected in series, the grid electrode of the first switching tube is connected to the control end, and the source electrode and the drain electrode of the first switching tube are respectively connected to the two ends of the first resistor;
the grid electrode of the second switching tube is connected to the control end, and the source electrode and the drain electrode of the second switching tube are respectively connected to the two ends of the second resistor;
the grid electrode of the third switching tube is connected to the control end, and the source electrode and the drain electrode of the third switching tube are respectively connected to the two ends of the third resistor;
when the thermistor detects that the temperature is greater than a preset threshold value and gradually rises, the first switching tube, the second switching tube and the third switching tube are sequentially cut off under the control of the control end, so that the first resistor to the third resistor are controlled to be sequentially connected to the clock signal line.
7. The display panel of claim 6, wherein the first switching tube has a first threshold voltage, the second switching tube has a second threshold voltage, the third switching tube has a third threshold voltage, the first threshold voltage is greater than the second threshold voltage, and the second threshold voltage is greater than the third threshold voltage.
8. The display panel according to claim 7, wherein when the thermistor has a first resistance value, the dummy scan driving unit outputs the dummy scan signal having a first voltage, the first voltage being greater than the first threshold voltage, the first switching tube, the second switching tube, and the third switching tube being turned on, the clock signal being transmitted to the clock signal line via the first switching tube, the second switching tube, and the third switching tube;
when the thermistor rises to a second resistance value, the virtual scanning driving unit outputs the virtual scanning signal with a second voltage, wherein the second voltage is smaller than the first threshold voltage and larger than the second threshold voltage and the third threshold voltage, the first switching tube is turned off, the second switching tube and the third switching tube are turned on, and the clock signal is transmitted to the clock signal line through the first resistor, the second switching tube and the third switching tube;
when the thermistor rises to a third resistance value, the virtual scanning driving unit outputs the virtual scanning signal with a third voltage, the third voltage is smaller than the second threshold voltage and larger than the third threshold voltage, the first switching tube and the second switching tube are turned off, the third switching tube is turned on, and the clock signal is transmitted to the clock signal line through the first resistor, the second resistor and the third switching tube;
when the thermistor rises to a fourth resistance value, the virtual scan driving unit outputs the virtual scan signal having a fourth voltage, the fourth voltage is smaller than the third threshold voltage, the first switching tube, the second switching tube and the third switching tube are turned off, and the clock signal is transmitted to the clock signal line through the first resistor, the second resistor and the third resistor.
9. The display panel of claim 8, wherein the first resistance value, the second resistance value, the three resistance values, and the fourth resistance value sequentially increase, and the first voltage, the second voltage, the third voltage, and the fourth voltage sequentially decrease.
10. A display device comprising a power module and a display panel according to any one of claims 1-9, the power module being adapted to provide a driving power for image display of the display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311118265.7A CN117116224A (en) | 2023-08-31 | 2023-08-31 | Display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311118265.7A CN117116224A (en) | 2023-08-31 | 2023-08-31 | Display panel and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117116224A true CN117116224A (en) | 2023-11-24 |
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ID=88807356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311118265.7A Pending CN117116224A (en) | 2023-08-31 | 2023-08-31 | Display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117116224A (en) |
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2023
- 2023-08-31 CN CN202311118265.7A patent/CN117116224A/en active Pending
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