CN117316112A - Display panel and display terminal - Google Patents
Display panel and display terminal Download PDFInfo
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- CN117316112A CN117316112A CN202311117821.9A CN202311117821A CN117316112A CN 117316112 A CN117316112 A CN 117316112A CN 202311117821 A CN202311117821 A CN 202311117821A CN 117316112 A CN117316112 A CN 117316112A
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- 239000003990 capacitor Substances 0.000 claims description 16
- 230000009467 reduction Effects 0.000 abstract description 2
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- 230000000875 corresponding effect Effects 0.000 description 7
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- 230000004044 response Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000032683 aging Effects 0.000 description 1
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Classifications
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application discloses a display panel and a display terminal, which comprise a plurality of scanning lines, a plurality of data lines and pixel units which are arranged in an array. The pixel unit comprises a signal receiving module, a driving module, a compensation module, a light emitting control module and a light emitting module, wherein the pixel unit comprises a continuous data input stage and a light emitting stage when displaying one frame of image, the signal receiving module receives a data signal from a data line and transmits the data signal to the driving module, the driving module charges to a first preset potential according to the data signal, the compensation module performs potential compensation on the driving module under the control of a scanning signal output by a first scanning line, and the driving module is located at a second preset potential. In the light emitting stage, the driving module supplies driving current to the light emitting module under the control of the scanning signal output by the second scanning line so as to drive the light emitting module. By compensating the driving module, the influence of threshold voltage drift and mobility reduction of the driving switch tube is eliminated.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display terminal.
Background
An Organic Light-Emitting Diode (OLED) display terminal has the advantages of self-luminescence, low driving current, high luminous efficiency, short response time, high definition and contrast, a viewing angle of nearly 180 degrees, wide use temperature range, capability of realizing flexible display, large-area full-color display and the like, and is considered as the display terminal with the most development potential in the industry. However, as the service life of the panel increases, the OLED devices in the panel drift and age, so that the OLED brightness is attenuated and the luminous efficiency is reduced.
At present, in an OLED pixel circuit, a threshold voltage drift phenomenon can occur in a driving tube in the use process, and the problem of electron mobility reduction can occur along with the aging of components, so that the problems of uneven brightness and the like of a panel occur, and the display effect is influenced. It is therefore a great need to address how to compensate both the threshold voltage drift and mobility drop.
Disclosure of Invention
In view of the above-described technical problems, the present application provides a display panel and a display terminal that can effectively compensate for a threshold drift and mobility degradation of a driving tube.
The embodiment of the application discloses a display panel, including n scan lines that extend along the first direction and arrange in proper order along the second direction, m data lines that extend along the second direction and arrange in proper order along the first direction and be the pixel unit that the array was arranged and is set up, the pixel unit is used for receiving scanning signal from the scan line to receive data signal from the data line under scanning signal's control in order to carry out image display. The pixel unit comprises a signal receiving module, a driving module, a compensation module, a light-emitting control module and a light-emitting module. The pixel unit comprises a continuous data input stage and a light emitting stage when displaying a frame of image, wherein in the data input stage, the signal receiving module receives a data signal from a data line and transmits the data signal to the driving module, the driving module charges to a first preset potential according to the data signal, the compensation module carries out potential compensation on the driving module under the control of a scanning signal output by a first scanning line, the driving module is positioned at a second preset potential, and in the light emitting stage, the driving module provides driving current for the light emitting module under the control of the scanning signal output by the second scanning line so as to drive the light emitting module.
Optionally, the signal receiving module is connected to the third scanning line and the jth data line, and is used for receiving data signals from the jth data line under the control of scanning signals output by the third scanning line, j is greater than or equal to 1 and less than or equal to m, the driving module is connected to the signal receiving module and the light emitting module, and is used for receiving data signals from the signal receiving module and driving the light emitting module to emit light according to the data signals, and the compensation module is connected to the driving module and is used for carrying out potential compensation on the driving module, wherein the third scanning line, the first scanning line and the second scanning line are the ith-2 scanning lines, the ith-1 scanning line and the ith scanning line which are sequentially arranged, and i is greater than or equal to 3 and less than or equal to n.
Optionally, the pixel unit further includes a driving control module and a light emitting control module, where the light emitting control module is connected to the i-2 th scanning line and connected in parallel with the light emitting module, and in the data input stage, the light emitting control module is electrically connected to the driving module under the control of the scanning signal and used for compensating the driving module by matching with the compensation module, and meanwhile controlling the light emitting module to disconnect from the driving module, and the driving control module is connected to the i-th scanning line, the driving voltage end and the driving module, and in the light emitting stage, is used for receiving the driving voltage from the driving voltage end and providing the corresponding driving current to the driving module under the control of the scanning signal.
Optionally, the pixel unit performs one frame of image display and further includes a reset stage and a precharge stage, in the reset stage, the driving voltage end, the driving control module, the driving module, the light emitting control module and the grounding end are electrically connected in sequence to form a conductive loop, and the conductive loop is used for transmitting charges in the driving module to the grounding end; in the pre-charging stage, the signal receiving module, the compensation module, the driving module, the light-emitting control module and the grounding end are electrically connected in sequence to form a conductive loop for pre-charging the driving module.
Optionally, the signal receiving module includes a first switching tube, a gate of the first switching tube is connected to the i-2 th scanning line, a source of the first switching tube is connected to the j-th data line, and a drain of the first switching tube is connected to the driving module and is used for being conducted under control of the scanning signal so as to transmit the data signal to the driving module. The driving module comprises a driving switch tube, a first capacitor, a second capacitor, a first node and a second node, wherein the first capacitor is connected between the drain electrode of the first switch tube and the first node, the second capacitor is connected between the first node and the second node, the grid electrode of the driving switch tube is connected to the first node, the source electrode of the driving switch tube is connected to the driving control module, the drain electrode of the driving switch tube is connected to the second node and used for receiving data signals from the first node and is conducted under the control of the data signals. The compensation module comprises a second switching tube, wherein the grid electrode of the second switching tube is connected with the ith-1 scanning line, the source electrode of the second switching tube is connected with the first node, the drain electrode of the second switching tube is connected with the source electrode of the driving switching tube, and the second switching tube is used for conducting under the control of scanning signals output by the ith-1 scanning line so as to compensate the driving switching tube.
Optionally, the driving control module includes a third switching tube, a gate electrode of the third switching tube is connected to the ith scanning line, a source electrode of the third switching tube is connected to the driving voltage end, a drain electrode of the third switching tube is connected to the source electrode of the driving control tube, and the driving control module is used for providing the driving voltage output by the driving voltage end to the driving module under the control of the scanning signal output by the ith scanning line. The light emitting module comprises a light emitting diode, wherein an anode of the light emitting diode is connected with the second node, and a cathode of the light emitting diode is connected with the grounding end and is used for receiving driving voltage from the second node to emit light. The light-emitting control module comprises a fourth switching tube, wherein the grid electrode of the fourth switching tube is connected with the i-2 th scanning line, the source electrode of the fourth switching tube is connected with the anode of the light-emitting diode, the drain electrode of the fourth switching tube is connected with the cathode of the light-emitting diode and is used for being conducted under the control of scanning signals output by the i-2 th scanning line so as to control the drive switching tube to be conducted with the grounding end.
Optionally, in the resetting phase, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the driving switch tube are turned on, so that charges in the first switch tube to the fourth switch tube and the driving switch tube are turned on to a ground terminal for resetting.
Optionally, in the precharge phase, the data signal is at a first potential, the first potential is higher than a threshold voltage of the driving switch tube, the first node, the second switch tube, the driving switch tube, the fourth switch tube and the ground end form a discharge loop, the first node discharges to precharge the driving switch tube, and when the potential of the first node drops below the threshold voltage, the driving switch tube stops precharging.
Optionally, the data input stage period includes a first period and a second period, in the first period, the first switch tube, the second switch tube and the fourth switch tube are turned on, the data signal rises from the first potential to the second potential, the potential of the first node rises to a first preset potential, and the first node is discharged through a discharge loop formed by the second switch tube, the driving switch tube and the fourth switch tube, and the first node falls from the first preset potential to the second preset potential. In the second period, the second switching tube is turned off, and the first node is maintained at a second preset potential to control the driving switching tube to be in a continuous on state.
The application provides a display terminal, including power module and foretell display panel, power module sets up in display panel's non-display surface for provide drive power supply when carrying out image display for display panel.
Compared with the prior art, the pixel unit is provided with the compensation module, the driving control module and the light-emitting control module, so that the potential and charge compensation can be effectively carried out on the driving switch tube in the pre-charging stage and the data input stage, the response speed of the driving switch tube is improved, the influence of the threshold voltage drift of the driving switch tube on the driving current is eliminated by matching with the control time sequence of the scanning signal, the mobility of the driving switch tube reaches a dynamic balance state, the mobility drop is slowed down, and the mobility drift compensation of the driving switch tube is realized.
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 terminal according to an 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 view of an array substrate of the display panel shown in FIG. 2;
FIG. 4 is a schematic block diagram of a circuit of the pixel unit in FIG. 3;
FIG. 5 is a schematic diagram of an equivalent circuit of the pixel unit in FIG. 4;
FIG. 6 is a timing chart showing the output of the scan signals in FIG. 5
Reference numerals illustrate:
the display terminal-100, the display panel-10, the power module-20, the display area-10 a, the non-display area-10B, the array substrate-10C, the opposite substrate-10 d, the display medium layer-10E, m Data lines-S1-Sm, n scanning lines-G1-Gn, a first direction-F1, a second direction-F2, a time sequence control circuit-11, a Data driving circuit-12, a scanning driving circuit-13, a pixel unit-15, a signal receiving module-151, a driving module-152, a compensation module-153, a driving control module-154, a light emitting module-155, a light emitting control module-156, an i-2 scanning line-Gi-2 the j-th Data line-Sj, the i-1-th scanning line-Gi-1, a driving voltage end-VDD, a grounding end-E, the i-th scanning line-Gi, a first switching tube-T1, a second switching tube-T2, a third switching tube-T3, a fourth switching tube-T4, a driving switching tube-TD, a first node-A, a second node-B, a first capacitor-C1, a second capacitor-C2, a reset stage-T1, a pre-charge stage-T2, a Data input stage-T3, a light emitting stage-T4, a first period-T31, a second period-T32, a Data signal-Data, a first potential-V1 and a second potential-V2.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described 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 that can be used to practice the present application. 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 terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms referred to in this application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description 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 terms in this application will be understood by those of ordinary skill in the art in a specific context. It should be noted that the terms "first," "second," and the like in the description and 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," "may be" or "including" as used in this application mean the presence of the corresponding function, operation, element, etc. disclosed, but not limited to other one or more additional functions, 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 present application, use of "may" means "one or more embodiments of the present 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 terminal 100 according to a first embodiment of the present application. The display terminal 100 includes a display panel 10 and a power module 20, wherein 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 driving power for displaying images on the display panel 10.
Referring to fig. 2, fig. 2 is a schematic side view of the display panel 10 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, and the non-display area 10b is disposed around the display area 10a to provide other auxiliary components or modules, and 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 10 d. In this embodiment, the display medium in the display medium layer 10e may be a semiconductor material such as OLED, micro LED, mini LED, etc.
Referring to fig. 3, fig. 3 is a schematic plan layout view of an array substrate 10c in the display panel 10 shown in fig. 2. As shown in fig. 3, the array substrate 10c includes a plurality of m×n pixel units 15 arranged in a matrix, m data lines S1 to Sm, and n scan lines G1 to Gn, where m and n are natural numbers greater than 1, corresponding to the image display area 10 a.
The n scan lines G1 to Gn extend along a first direction F1 and are mutually insulated and arranged in parallel along a second direction F2, and the m data lines S1 to Sm extend along the second direction F2 and are mutually insulated and arranged in parallel along the first direction F1, wherein the first direction F1 and the second direction F2 are mutually perpendicular.
The display terminal 100 further includes a timing control circuit 11 for driving the pixel units to display an image, a data driving circuit 12, and a scan driving circuit 13 provided on the array substrate 10c corresponding to the non-display region 10b (fig. 2) of the display panel 10.
The timing control circuit 11 is electrically connected to the data driving circuit 12 and the scan driving circuit 13, and is used for controlling the working timings of the data driving circuit 12 and the scan driving circuit 13, i.e. outputting corresponding timing light-emitting signals to the data driving circuit 12 to the scan driving circuit 13, so as to control when to output corresponding scan signals and data signals.
The Data driving circuit 12 is electrically connected to the m Data lines S1 to Sm, and is configured to transmit a Data signal (Data) for display to the plurality of pixel units 15 in the form of Data voltages through the m Data lines S1 to Sm.
The scan driving circuit 13 is electrically connected to the n scan lines G1 to Gn, and is configured to output scan signals through the n scan lines G1 to Gn for controlling when the pixel unit 15 receives data signals. The scan driving circuit 13 sequentially outputs scan signals from the n scan lines G1 to Gn in the position arrangement order from the scan lines G1, G2, … …, gn in the scan period.
In the present embodiment, the circuit elements in the scan driving circuit 13 and the pixel units 15 in the Array substrate 10c are fabricated in the same process in the Array substrate 10c, i.e. GOA (Gate Dri-2ver on Array) technology.
Referring to fig. 4, fig. 4 is a schematic block diagram of a circuit of the pixel unit 15 in fig. 3.
As shown in fig. 4, taking the ith row and jth column pixel unit as an example, 3.ltoreq.i.ltoreq.n, 1.ltoreq.j.ltoreq.m, the pixel unit 15 includes a signal receiving module 151, a driving module 152, a compensating module 153, a driving control module 154, a light emitting module 155 and a light emitting control module 156, wherein the signal receiving module 151 is connected to the driving module 152, the ith-2 th scan line Gi-2 and the jth data line Sj, and is configured to receive a scan signal from the ith-2 th scan line Gi-2, and receive a data signal from the jth data line Gj under the control of the scan signal and transmit the data signal to the driving module 152.
The driving module 152 is connected to the i-1 th scan line Gi-1, the driving control module 154 and the light emitting module 155, and is configured to receive a scan signal from the i-1 th scan line Gi-1 and a data signal from the signal receiving module 151 under the control of the scan signal, and receive a driving voltage from the driving control module 154 under the control of the data signal to drive the light emitting module 155 to emit light.
The compensation module 153 is connected to the driving module 152 and the i-1 th scan line, and is configured to conduct under the control of the scan signal output by the i-1 th scan line, so as to perform potential compensation on the driving module 152.
The driving control module 154 is further connected to the ith scan line Gi and the driving voltage terminal VDD, and is configured to receive a driving voltage from the driving voltage terminal VDD under the control of the scan signal output by the ith scan line Gi and transmit the driving voltage to the driving module 152, so that the driving module 152 drives the light emitting module 155 to emit light.
The light emitting module 155 is connected between the driving module 152 and the ground terminal E, and is configured to emit light under the control of the driving voltage output by the driving module 152.
The light-emitting control module 156 is connected to the i-2 th scan line Gi-2 and two ends of the light-emitting module 155, and is configured to control the light-emitting module 155 to be connected to the driving module 152 when the i-2 nd scan line Gi-2 does not output a scan signal, so that the light-emitting module 155 emits light under the driving of the driving module 152.
The pixel unit 15 sequentially includes a reset phase, a precharge phase, an input phase and a light-emitting phase, and in the reset phase, the driving voltage terminal VDD, the driving control module 154, the driving module 152, the light-emitting control module 156 and the ground terminal E are sequentially electrically connected to form a conductive loop for eliminating residual charges in the driving module 152.
In the pre-charging stage, the signal receiving module 151, the compensating module 153, the driving module 152, the light emitting control module 156 and the ground terminal E are electrically connected in sequence to form a conductive loop for pre-charging the driving module 152.
In the data input stage, the signal receiving module 151 receives a data signal from the j-th data line and transmits the data signal to the driving module 152, the driving module 152 charges to a first preset potential according to the data signal, and the compensating module 153 performs potential compensation on the driving module 152 under the control of the scanning signal output by the i-1 th scanning line, where the driving module 152 is located at a second preset potential.
In the light emitting stage, the driving module 152 supplies a driving current to the light emitting module under the control of the scan signal output from the ith scan line to drive the light emitting module 155.
Referring to fig. 5, fig. 5 is an equivalent circuit schematic diagram of the pixel unit in fig. 4.
As shown in fig. 5, the signal receiving module 151 includes a first switching tube T1, wherein a gate of the first switching tube T1 is connected to the i-2 th scan line Gi-2, a source is connected to the j-th data line Sj, and a drain is connected to the driving module 152, and is configured to be turned on under the control of the scan signal and receive the data signal from the j-th data line Sj for transmission to the driving module 152.
The driving module 152 includes a first capacitor C1, a second capacitor C2, a driving switch tube TD, a first node a and a second node B, wherein the first capacitor C1 is connected between a source of the first switch tube T1 and the first node a, a gate of the driving switch tube TD is connected to the first node a, a source is connected to the driving control module 154, a drain is connected to the second node B and is connected to the light emitting module 155 via the second node B. The second capacitor C2 is connected between the first node a and the second node B, i.e. between the gate and the source of the driving switch TD.
The compensation module 153 includes a second switching tube T2, a gate of the second switching tube T2 is connected to the i-1 scanning line, a source is connected to the first node a, and a drain is connected to a source of the driving switching tube TD, that is, the source and the drain of the second switching tube T2 are connected between the gate and the source of the driving switching tube TD.
The driving control module 154 includes a third switching tube T3, where a gate of the third switching tube T3 is connected to the ith scan line Gi, a source of the third switching tube is connected to the driving voltage terminal VDD, and a drain of the third switching tube T3 is connected to the source of the driving switching tube TD, and is used for transmitting the driving voltage to the driving switching tube TD when the third switching tube T3 receives the scan signal.
The light emitting module 155 includes a light emitting unit D, wherein an anode of the light emitting diode D is connected to the second node B, i.e., a drain of the driving switch tube TD, and a cathode of the light emitting diode D is connected to the ground terminal E, and is configured to receive a driving voltage from the driving switch tube TD and emit light under the control of a voltage difference between the driving voltage and the ground terminal E.
The light-emitting control module 156 includes a fourth switching tube T4, wherein the gate of the fourth switching tube T4 is connected to the i-2 th scan line Gi-2, the source is connected to the anode of the light-emitting diode D, and the drain is connected to the cathode of the light-emitting diode D, and is used for being turned on under the control of the i-2 th scan line Gi-2 to control the light-emitting diode D to stop emitting light.
Referring to fig. 6, fig. 6 is a timing chart of outputting the scan signal in fig. 5.
As shown in fig. 6, the pixel unit 15 performs one frame image display including four consecutive stages, namely a reset stage T1, a precharge stage T2, a Data input stage T3 and a light emitting stage T4, wherein in the reset stage T1, the i-2 th scan line Gi-2, the i-1 th scan line Gi-1 and the i-th scan line Gi output scan signals respectively control the first switching transistor T1, the second switching transistor T2, the third switching transistor T3 and the fourth switching transistor T4 to be in an on state, the Data signal Data is at a first potential V1, i.e. a Data signal of the first potential V1 is output such that the first node a is at the first potential V1, wherein the first potential V1 is higher than the threshold voltage V of the driving transistor TD TD That is, when the first node a is at the first potential V1, the driving switching transistor TD is in an on state. The driving voltage charges the second node B to a preset potential, that is, the potential of the driving voltage terminal VDD, through the third switching tube T3 and the second switching tube T2, and the driving current output by the driving voltage terminal VDD is transmitted to the ground terminal E through the driving switching tube TD and the fourth switching tube T4, so that the influence of residual charges on the image display is effectively prevented by resetting each node and each switching tube before the light emitting module 155 is driven to emit light.
In the precharge phase T2, the i-2 th scan line Gi-2 and the i-1 th scan line Gi-1 output scan signals, the i-th scan line Gi stops outputting scan signals, at this time, the first switch tube T1, the second switch tube T2 and the fourth switch tube T4 are turned on, the third switch tube T3 is in a cut-off state, the Data signal Data is at the first potential V1, at this time, the first node A gradually discharges, the discharge current is discharged through the second switch tube T2 and the fourth switch tube T4, and the potential of the first node AGradually decreasing from the first potential V1 to the threshold voltage V of the driving switch tube TD TD At the time of falling to the threshold voltage V of the driving switch tube TD TD And then, the switching tube TD is driven to be cut off. The charge of the first node a is released to the driving switch tube TD through the second switch tube T2, so that the driving switch tube TD is precharged before the driving switch tube TD is controlled to drive the light emitting diode D to emit light, so as to increase the response speed of the driving switch tube TD.
The data input stage T3 includes a first period T31 and a second period T32, in the first period T31, the i-1 th scan line Gi-1 outputs a scan signal to control the second switching tube T2 to be turned on, the i-2 nd scan line Gi-2 outputs a scan signal to control the first switching tube T1 and the fourth switching tube T4 to be turned on, and the i-th scan line Gi stops outputting a scan signal to control the third switching tube T3 to be turned off. The Data signal Data rises from the first potential V1 to the second potential V2, and the potential of the first node A rises to the first control potential V after being coupled by the first capacitor C1 and the second capacitor C2 A1 A first control potential V A1 ＝V TD +C2/(C1+C2) × (V2-V1), and then the charge of the first node A is discharged via the second switching tube T2, the driving switching tube TD and the fourth switching tube T4, so that the potential of the first node A is controlled by the first control potential V A1 Gradually decrease to the second control potential V A2 At the same time, the potential of the second node B is gradually reduced to the second control potential V A2 At this time, the potential change amount DeltaV of the first node A μ ＝V A1 -V A2 The potential variation DeltaV μ Is positively correlated with the mobility μ of the drive switching tube TD.
At the second time period T32, the second switching tube T2 is turned off, and the potential of the first node A is the second control potential V A2 A second control potential V A2 ＝V TD +C2/(C1+C2)×(V2-V1)-△V μ . The potential of the second node B is 0, the potential V at the two ends of the second capacitor C2 C2 Equal to the voltage difference between the first node A and the second node B, i.e. equal to the second control potential V A2 。
In the light-emitting stage T4, the ith scan line Gi outputs a scan signal to control the third switch tube T3 to be turned on, the (i-2) th scan line Gi-2 and the (i-1) th scan line GThe i-1 stops outputting the scanning signal to control the first switching tube T1, the second switching tube T2 and the fourth switching tube T4 to be in a cut-off state. At this time, the potentials of the first node A and the second node B rise to the driving voltage, so that the driving switch tube TD is turned on to drive the light emitting diode D to emit light, and at this time, the gate-source voltage V of the driving switch tube TD GS Equal to the voltage V across the second capacitor C2 C2 . And due to the driving current I D ＝k/2×(V GS -V TD ) 2 V is set up GS ＝V C2 ＝V TD +C2/(C1+C2)×(V 2 －V 1 )－ΔV μ Carry over I D Obtain I D ＝k/2[V TD +C2/(C1+C2)×(V 2 －V 1 )－ΔV μ -V TD ] 2 ＝k/2[+C2/(C1+C2)×(V 2 －V 1 )－ΔV μ ] 2 From this, it can be seen that the driving current I D And threshold voltage V of driving switch tube TD TH Independent of, i.e. driving, the threshold voltage V of the switching tube TD TH The variation of (1) does not affect the drive current I D That is, according to the pixel unit circuit design and the control timing, the threshold voltage drift of the driving switch tube TD can be compensated, thereby eliminating the threshold voltage V TH For driving current I D Is a function of (a) and (b).
Wherein k=μ×c ox ×W/L，C ox W/L is the width-to-length ratio of the TD channel of the drive tube, which is the capacitance of the gate oxide layer, according to I D ＝k/2[C2/(C1+C2)×(V 2 －V 1 )－ΔV μ ] 2 It can be seen that k is positively correlated with the mobility μ of the drive switching tube TD, - Δv μ Is inversely related to the mobility μ of the driving switching tube TD, and therefore, k and- Δv μ For driving current I D The influence of the driving switch tube TD is counteracted, so that the mobility mu of the driving switch tube TD reaches balance, and mobility decline of the driving switch tube TD is slowed down, namely, compensation of the mobility mu is realized.
By arranging the compensation module, the driving control module and the light-emitting control module on the pixel unit, the potential and charge compensation can be effectively carried out on the driving switch tube in the pre-charging stage and the data input stage, the response speed of the driving switch tube is improved, the influence of the threshold voltage drift of the driving switch tube on the driving current is eliminated by matching with the control time sequence of the scanning signal, the mobility of the driving switch tube reaches a dynamic balance state, the mobility drop is slowed down, and the compensation of the mobility drift of the driving switch tube is realized.
It is to be understood that the invention 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 n scanning lines extending along a first direction and sequentially arranged along a second direction, m data lines extending along the second direction and sequentially arranged along the first direction, and pixel units arranged in an array, wherein the pixel units are used for receiving scanning signals from the scanning lines and receiving data signals from the data lines under the control of the scanning signals so as to display images; the pixel unit is characterized by comprising a signal receiving module, a driving module, a compensation module, a light-emitting control module and a light-emitting module;
the pixel unit comprises a continuous data input stage and a light emitting stage when displaying a frame of image, wherein in the data input stage, the signal receiving module receives the data signal from the data line and transmits the data signal to the driving module, the driving module charges to a first preset potential according to the data signal, the compensation module performs potential compensation on the driving module under the control of a scanning signal output by a first scanning line, and the driving module is positioned at a second preset potential;
in the light emitting stage, the driving module supplies driving current to the light emitting module under the control of a scanning signal output by the second scanning line so as to drive the light emitting module.
2. The display panel according to claim 1, wherein the signal receiving module is connected to a third scan line and a j-th data line, and is configured to receive a data signal from the j-th data line under the control of a scan signal output from the third scan line, where 1 is less than or equal to j is less than or equal to m, the driving module is connected to the signal receiving module and the light emitting module, and is configured to receive the data signal from the signal receiving module and drive the light emitting module to emit light according to the data signal, and the compensation module is connected to the driving module, and is configured to perform potential compensation on the driving module, where the third scan line, the first scan line, and the second scan line are i-2 scan lines, i-1 scan line, and i is less than or equal to 3 is less than or equal to n.
3. The display panel according to claim 2, wherein the pixel unit further comprises a driving control module and a light emitting control module, the light emitting control module is connected to the i-2 th scanning line and connected in parallel with the light emitting module, and in the data input stage, the light emitting control module is electrically connected to the driving module under the control of a scanning signal, and is used for matching with the compensation module to compensate the driving module and simultaneously controlling the light emitting module to be disconnected from the driving module;
the driving control module is connected to the ith scanning line, the driving voltage end and the driving module, and is used for receiving driving voltage from the driving voltage end and providing corresponding driving current to the driving module under the control of a scanning signal in the light-emitting stage.
4. The display panel according to claim 3, wherein the pixel unit performs a frame image display further comprising a reset phase and a precharge phase, and in the reset phase, the driving voltage terminal, the driving control module, the driving module, the light emitting control module and the ground terminal are electrically connected in sequence to form a conductive loop, and the conductive loop is used for transmitting charges in the driving module to the ground terminal;
in the pre-charging stage, the signal receiving module, the compensation module, the driving module, the light-emitting control module and the grounding end are electrically connected in sequence to form a conductive loop for pre-charging the driving module.
5. The display panel of claim 4, wherein the signal receiving module comprises a first switching tube, a gate electrode of the first switching tube is connected to the i-2 th scanning line, a source electrode of the first switching tube is connected to the j-th data line, and a drain electrode of the first switching tube is connected to the driving module for being conducted under control of the scanning signal to transmit the data signal to the driving module;
the driving module comprises a driving switch tube, a first capacitor, a second capacitor, a first node and a second node, wherein the first capacitor is connected between a drain electrode of the first switch tube and the first node, the second capacitor is connected between the first node and the second node, a grid electrode of the driving switch tube is connected with the first node, a source electrode of the driving switch tube is connected with the driving control module, and a drain electrode of the driving switch tube is connected with the second node and used for receiving the data signal from the first node and is conducted under the control of the data signal;
the compensation module comprises a second switching tube, wherein the grid electrode of the second switching tube is connected with the ith-1 scanning line, the source electrode of the second switching tube is connected with the first node, and the drain electrode of the second switching tube is connected with the source electrode of the driving switching tube and is used for being conducted under the control of scanning signals output by the ith-1 scanning line so as to compensate the driving switching tube.
6. The display panel according to claim 5, wherein the driving control module includes a third switching tube, a gate electrode of the third switching tube is connected to the ith scan line, a source electrode of the third switching tube is connected to the driving voltage terminal, and a drain electrode of the third switching tube is connected to the source electrode of the driving control tube, for providing the driving voltage output from the driving voltage terminal to the driving module under the control of the scan signal output from the ith scan line;
the light emitting module comprises a light emitting diode, wherein an anode of the light emitting diode is connected with the second node, and a cathode of the light emitting diode is connected with a grounding end and is used for receiving the driving voltage from the second node to emit light;
the light-emitting control module comprises a fourth switching tube, wherein the grid electrode of the fourth switching tube is connected with the ith-2 scanning lines, the source electrode of the fourth switching tube is connected with the anode of the light-emitting diode, the drain electrode of the fourth switching tube is connected with the cathode of the light-emitting diode and is used for being conducted under the control of scanning signals output by the ith-2 scanning lines so as to control the drive switching tube to be conducted with the grounding end.
7. The display panel of claim 6, wherein in the reset phase, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, and the driving switching tube are turned on to conduct charges in the first switching tube to the fourth switching tube and the driving switching tube to the ground terminal for resetting.
8. The display panel of claim 7, wherein the data signal is at a first potential higher than a threshold voltage of the driving switching tube during the precharge phase, the first node, the second switching tube, the driving switching tube, the fourth switching tube, and the ground terminal form a discharge loop, the first node discharges to precharge the driving switching tube, and the driving switching tube stops precharging when the potential of the first node drops below the threshold voltage.
9. The display panel according to claim 8, wherein the data input stage period includes a continuous first period in which the first switching tube, the second switching tube, and the fourth switching tube are turned on, the data signal rises from the first potential to a second potential, a potential of a first node rises to the first preset potential, and a discharge loop formed by the second switching tube, the driving switching tube, and the fourth switching tube discharges, the first node falls from the first preset potential to the second preset potential;
and in the second period, the second switching tube is turned off, and the first node is maintained at the second preset potential so as to control the driving switching tube to be in a continuous on state.
10. A display terminal comprising a power module and a display panel according to any one of claims 1 to 9, wherein the power module is disposed on a non-display surface of the display panel, and is configured to provide a driving power for performing image display on the display panel.
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