CN116798373B - Display panel and display control method - Google Patents
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- CN116798373B CN116798373B CN202310797082.6A CN202310797082A CN116798373B CN 116798373 B CN116798373 B CN 116798373B CN 202310797082 A CN202310797082 A CN 202310797082A CN 116798373 B CN116798373 B CN 116798373B
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- 230000000630 rising effect Effects 0.000 claims description 266
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- 238000010586 diagram Methods 0.000 description 14
- 241001270131 Agaricus moelleri Species 0.000 description 10
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
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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
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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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]
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application discloses a display panel and a display control method, wherein the display panel comprises a time sequence control circuit, a plurality of data driving circuits and a pixel area formed by a plurality of pixel units, the time sequence control circuit is used for controlling the plurality of data driving circuits to output data signals, and the plurality of data driving circuits are connected with the pixel units through first ends of a plurality of data lines so as to drive the pixel units to display images. The display panel further comprises a plurality of detection lines, the detection lines are respectively connected to the data driving circuits and the second ends of the data lines, the detection lines are used for detecting data signals in the data lines and outputting the obtained detection signals to the time sequence control circuit, and the time sequence control circuit compensates the data signals according to the detection signals so as to control the difference between corresponding gray scale voltages and preset gray scale voltages of the data signals to be in a preset range, so that the data signal attenuation difference caused by the impedance of the data lines is reduced, and the image display effect is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a display control method.
Background
At present, a liquid crystal display panel, an OELD display panel, a Micro-LED display panel and the like are all developed towards the direction of a large screen and a thin frame, but due to the influence of a production process, a signal transmission line in the display panel has the problem of uneven impedance, and the uneven impedance can cause the display panel to control pixel units displayed between different data driving circuits to generate chromatic aberration when performing image display, so that the impedance difference between the different data driving circuits is reduced, the chromatic aberration between the pixel units is reduced, and the problem to be solved is urgently for improving the display effect.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present application provides a display panel and a display control method that can effectively reduce the impedance difference between data driving circuits.
The application provides a display panel, which comprises a time sequence control circuit, a plurality of data driving circuits and a pixel region formed by a plurality of pixel units, wherein the time sequence control circuit is connected with the data driving circuits and is used for controlling the data driving circuits to output data signals, and the data driving circuits are connected with the pixel units through first ends of the data lines and are used for outputting the data signals to the pixel units so as to drive the pixel units to display images. The display panel further comprises a plurality of detection lines, the detection lines are respectively connected to the data driving circuits and the second ends of the data lines, wherein data signals are transmitted from the first ends to the second ends, the detection lines are used for detecting the data signals in the data lines and transmitting the obtained detection signals to the time sequence control circuit through the data driving circuits, and the time sequence control circuit compensates the data signals according to the detection signals so as to control the difference between the corresponding gray scale voltages of the data signals and the preset gray scale voltages to be within a preset range.
Optionally, the first end and the second end are opposite ends of the data line, and each data driving circuit is provided with at least one detection line correspondingly connected to the data line and the data driving circuit.
Optionally, the timing control circuit determines an effective charging duration of the data signal according to the detection signal, and calculates a rising duration according to a preset reference duration and the effective charging duration, where the rising duration is a duration required by the voltage of the data signal to rise to a preset voltage, the effective charging duration is a duration required by the voltage of the data signal to be loaded to the pixel unit to be maintained at the preset voltage, and the preset voltage is a voltage required by the pixel unit to execute image display;
The time sequence control circuit performs gray level compensation on the data signal according to the difference between the rising time length and the preset rising time length so as to control the difference between the rising time length of the data signal and the preset rising time length to be in a preset range.
The application also provides a display control method which is applied to the display panel and comprises the steps of receiving a plurality of detection signals from a plurality of detection lines; the detection signal is transmitted to the time sequence control circuit through the data driving circuit, and the time sequence control circuit compensates the data signal according to the detection signal so as to control the difference between the corresponding gray scale voltage of the data signal and the preset gray scale voltage to be in a preset range.
Optionally, determining a rising time length of the data signal output by each data driving circuit according to the detection signal, determining a first rising time length and a second rising time length in the plurality of rising time lengths, equally dividing the first rising time length and the second rising time length to obtain an equal value, calculating an intermediate rising time length according to the first rising time length and the second rising time length, wherein the intermediate rising time length is located between the first rising time length and the second rising time length, dividing at least two compensation ranges according to the intermediate rising time length and the equal value, respectively compensating different gray scale voltages for the data signals in different compensation ranges, and controlling the difference between the gray scale voltage of the data signal and a preset gray scale voltage to be within the preset range.
Optionally, the detection signal is used for representing an effective charging duration of the data signal, and the effective charging duration is differenced from a preset reference duration to obtain the rising duration.
Optionally, among the plurality of rising periods, the first rising period is the smallest rising period, the second rising period is the largest rising period, and the middle rising period is located at a midpoint position between the first rising period and the second rising period.
Optionally, the at least two compensation ranges include a first compensation range and a second compensation range,
The range of the interval with the middle rising time length being less than or equal to one equivalent value is a first compensation range, and the range of the interval with the middle rising time length being more than one equivalent value and less than or equal to at least two equivalent values is a second compensation range.
Optionally, determining a first compensation range and a second compensation range according to the intermediate rising duration and the equal value, compensating the data signal with the rising duration in the first compensation range for a first gray scale, and compensating the data signal with the rising duration in the second compensation range for a second gray scale to control the difference between the gray scale voltage of the data signal and the preset gray scale voltage within the preset range.
Optionally, determining a first compensation range and a second compensation range according to the midpoint rising duration and the equal value, compensating the data signal with the rising duration in the first compensation range for a first charging duration, and compensating the data signal with the rising duration in the second compensation range for a second charging duration.
Optionally, the first compensation range includes a first sub-compensation range and a second sub-compensation range, the first sub-compensation range is a range adjacent to one side of the minimum rising duration and spaced from the middle rising duration by equal to or less than an equal value, and the second sub-compensation range is a range adjacent to one side of the maximum rising duration and spaced from the middle rising duration by equal to or less than an equal value. The second compensation range includes a third sub-compensation range and a fourth sub-compensation range, the third sub-compensation range is a range which is adjacent to one side of the minimum rising time length and is spaced from the middle rising time length by more than one equivalent value and less than or equal to at least two equivalent values, and the fourth sub-compensation range is a range which is adjacent to one side of the maximum rising time length and is spaced from the middle rising time length by more than one equivalent value and less than or equal to at least two equivalent values.
Optionally, when the rising duration of the data signal is in the first sub-compensation range, the data signal is controlled to decrease the first gray level, when the rising duration of the data signal is in the second sub-compensation range, the data signal is controlled to increase the first gray level, when the rising duration of the data signal is in the third sub-compensation range, the data signal is controlled to decrease the second gray level, and when the rising duration of the data signal is in the fourth sub-compensation range, the data signal is controlled to increase the second gray level.
Optionally, a corresponding preset gray scale range is set between the first rising duration and the second rising duration, a first reference gray scale, a middle reference gray scale and a second reference gray scale are determined, wherein the first reference gray scale is a gray scale value corresponding to the first rising duration, the middle reference gray scale is a gray scale value corresponding to the middle rising duration, the second reference gray scale is a gray scale value corresponding to the second rising duration, the first reference gray scale, the middle reference gray scale and the second reference gray scale are sequentially increased, the first gray scale and the second gray scale are located between the first reference gray scale and the middle reference gray scale, and the first gray scale is smaller than the second gray scale.
Optionally, when the rising period of the data signal is in the first sub-compensation range, the effective charging period of the data signal is controlled to be reduced by the first charging period, when the rising period of the data signal is in the second sub-compensation range, the effective charging period of the data signal is controlled to be increased by the first charging period, when the rising period of the data signal is in the third sub-compensation range, the effective charging period of the data signal is controlled to be reduced by the second charging period, and when the rising period of the data signal is in the fourth sub-compensation range, the effective charging period of the data signal is controlled to be increased by the second charging period.
Compared with the prior art, the detection line is arranged at one end, far away from the data driving circuit, of the data line and is used for detecting data signal attenuation caused by data line impedance, gray scale voltages of the data signals are adjusted according to detection results, the difference between the gray scale voltages of all the data signals and the preset gray scale voltages is within a preset range, display difference among pixel units is reduced, and overall uniformity of the display panel in displaying images 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 terminal 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 view of the display panel of FIG. 2;
FIG. 4 is a schematic diagram illustrating connection between the detection lines and the data lines in FIG. 3;
FIG. 5 is a schematic diagram showing the impedance distribution of the data line in FIG. 4;
FIG. 6 is a schematic diagram of waveforms of data signals under different impedance conditions;
fig. 7 is a diagram showing an image display method according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of the division of the rising duration of a data signal;
FIG. 9 is a schematic diagram of time compensation for data signals
Reference numerals:
The display device comprises a display terminal-100, a display panel-10, a power module-20, a supporting frame-30, a display area-10 a, a non-display area-10 b, an array substrate-10 c, a counter substrate-10D, a display medium layer-10 e, a data line-S, a detection line-DE, 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 first waveform-D1-a second waveform-D2, a third waveform-D3, a preset reference time length-T rising time length-Ta, an effective charging time length-Tb, a minimum rising time length-Tbmin, a midpoint rising time length-Tbmid, a maximum rising time length-Tbmax and an equal value-DeltaT.
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 terminal according to a first embodiment of the present application. As shown in fig. 1, the display terminal 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 the back surface of the display panel 10, that is, the 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 terminal 100 may not need to be provided with the support 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.
Referring to fig. 3, fig. 3 is a schematic plan view of the display panel in fig. 2.
As shown in fig. 3, the display panel 10 further includes a timing control circuit 11, a plurality of data driving circuits 12, and a scan driving circuit 13, wherein the timing control circuit 11 and the plurality of data driving circuits 12 are disposed on a control circuit board (not shown) independent of the display region 10a and the non-display region 10b, and the scan driving circuit 13 is disposed on the non-display region 10b of the display panel 10. The timing control circuit 11 receives an image signal representing image information, a horizontal synchronization signal, and a vertical synchronization signal from an external signal source, and outputs a data control signal for controlling the data driving circuit 12 and a scan control signal for controlling the scan driving circuit 13.
The data driving circuit 12 is used for outputting a data signal to the display area 10a according to a vertical synchronizing signal according to a data control signal outputted from the timing control circuit 11. The scan driving circuit 13 receives the scan control signal and the clock signal outputted from the timing control circuit 11, and outputs a scan signal to the display area 10a according to the scan control signal and the clock signal, and the pixel units in the display area 10a receive the data signal from the data driving circuit 12 under the control of the scan signal to perform image display.
Each data driving circuit 12 is respectively connected to a first end of a plurality of data lines S disposed along a first direction F1, at least one detection line DE is respectively disposed corresponding to each data driving circuit 12, and the detection line DE is connected to the data driving circuit 12 and a second end of the data lines S, and is used for detecting a data signal output by the current data driving circuit 12 into the data lines S and obtaining a detection signal, and determining an effective charging time of the data signal according to the detection signal. The data signal is transmitted from the first end to the second end, the timing control circuit 11 compensates the data signal according to the detection signal to control the difference between the gray-scale voltage corresponding to the data signal and the preset gray-scale voltage within a preset range, wherein the preset gray-scale voltage is the gray-scale voltage required by the pixel unit for displaying the image in the state of no impedance in the data line.
The data driving circuit 12 may be fabricated On a flexible circuit board, i.e., a Chip On Film (COF) by using a die-attach Film packaging technology.
In this 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.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating connection between the detection line and the data line in fig. 3.
As shown in fig. 4, each data driving circuit 12 is connected to a plurality of data lines S, at least one detection line DE is disposed corresponding to each data driving circuit 12 and is connected to an end of the data line far away from the data driving circuit 12, and meanwhile, the detection line DE is connected to the data driving circuit 12 and is used for transmitting detection signals to the timing control circuit 11 through the data driving circuit 12, and the timing control circuit 11 compensates the data signals according to the detection signals so as to control a difference between a corresponding gray scale voltage and a preset gray scale voltage of the data signals to be within a preset range.
In an exemplary embodiment, two detection lines DE may be correspondingly provided for each data driving circuit 12, where the two detection lines are respectively connected to the first and second data lines S in each data driving circuit 12, for detecting data signals in the first and second data lines, and of course, the number of the detection lines and the specific data lines to which the detection lines are connected may be set according to specific needs, which is not limited in the present application.
Referring to fig. 5, fig. 5 is a schematic diagram of the impedance distribution of the data line in fig. 4.
As shown in fig. 5, when the data line S is gradually far from the data driving circuit 12 along the first direction F1 due to the self-contained resistor R in the data line S and the capacitance C between the data line S and the pixel unit or other components, the impedance in the data line S gradually increases, so that the voltage of the data signal drops when the data signal is transmitted to the end of the data line, and the preset gray-scale voltage cannot be reached, and the color difference occurs between different pixel units due to the different impedances between different data lines, which affects the display effect.
Referring to fig. 6, fig. 6 is a schematic diagram of waveforms of data signals under different impedance conditions.
As shown in fig. 6, the first waveform D1 is an ideal waveform of the data signal, that is, the default data signal has no impedance effect in the output process, so that the data signal is completely output, and the charging time of the data signal to the pixel unit is the completed charging time.
The second waveform D2 is an actual waveform of the data signal in the display panel 10, and the data signal is affected by the impedance in the data line and other impedances during the transmission process, so that the waveform is changed, so that the data signal has a rising period Ta and an effective charging period Tb, when the data signal is in a period of the period, the voltage of the data signal is in a continuously rising state until reaching a preset voltage, and when the data signal reaches the preset voltage, the data signal is in a period of the effective charging period, and at this time, the data signal charges the pixel unit to control the pixel unit to perform image display.
The third waveform D3 is a waveform of the data signal detected by the timing control circuit 11 through the detection line DE, and at this time, the charging duration of the data signal is the effective charging duration Tb, that is, the charging duration of the data signal detected by the timing control circuit 11 through the detection line DE is the actual charging duration of the data signal under the influence of impedance.
The ideal charging time length is taken as a preset reference time length T, the difference between the preset reference time length T and the effective charging time length Tb is equal to the rising time length Ta, when the impedance of the data lines is the same, the rising time length Ta of each data signal is basically consistent, and at the moment, the plurality of pixel units P in the display area 10a display the same charging time length, so that the image display is uniform. However, due to the difference of parasitic capacitance and data line impedance, the rising duration Ta is different in the data signals transmitted by the data lines, that is, the effective charging duration of the pixel unit is different, so that the display is uneven.
Referring to fig. 7, fig. 7 is a diagram illustrating an image display method according to a second embodiment of the present disclosure.
As shown in fig. 7, the specific steps are as follows:
S101, receiving a plurality of detection signals from a plurality of detection lines.
By providing at least one detection line DE for each data driving circuit 12, each detection line DE is connected to one data line for detecting the effective charging period Tb of the data driving circuit 12 outputting the data signal.
For example, the display panel 10 includes 12 data driving circuits 12, where 960 data lines are connected to each data driving circuit 12 for outputting 960 data signals respectively, and at least one detection line DE is provided for 960 data lines S in each data driving circuit 12, and one data line S forms a detection loop for detecting an effective charging period Tb of the data signals in the data line S. When one detection line DE is provided for each data driving circuit 12, a total of 12 effective charge periods Tb can be detected, and when two detection lines DE are provided for each data driving circuit 12, a total of 24 effective charge periods Tb can be obtained.
S102, the detection signals are transmitted to a time sequence control circuit through a data driving circuit, and the time sequence control circuit compensates the data signals according to the detection signals so as to control the difference between the corresponding gray scale voltages of the data signals and the preset gray scale voltages to be in a preset range.
The detection signal is transmitted to the timing control circuit 11 through the data driving circuit 12, and the timing control circuit 11 compensates the data signal according to the detection signal to control the difference between the corresponding gray scale voltage of the data signal and the preset gray scale voltage within the preset range.
Specifically, the rising period of the data signal output from each data driving circuit is determined according to the detection signal. The timing control circuit 11 respectively makes differences between each detected effective charging duration Tb and a preset reference duration T to obtain rising durations Ta of a plurality of corresponding data signals, wherein the preset reference duration.
For example, when one detection line DE is set for each of the 12 data driving circuits 12, a total of 12 rise time periods Ta can be calculated, and when two detection lines DE are set for each of the data driving circuits 12, a total of 24 rise time periods Ta can be calculated.
Determining a first rising time length and a second rising time length in a plurality of rising time lengths, equally dividing the first rising time length and the second rising time length to obtain equal values, and calculating an intermediate rising time length according to the first rising time length and the second rising time length, wherein the intermediate rising time length is positioned between the first rising time length and the second rising time length.
Detecting a plurality of rising time periods Tb by the plurality of data driving circuits 12, determining a first rising time period and a second rising time period in the plurality of rising time periods Tb, wherein the first rising time period is smaller than the second rising time period, equally dividing the first rising time period and the second rising time period to obtain an equal value deltat, and determining an intermediate rising time period, and the intermediate rising time period is located between the first rising time period and the second rising time period.
In an exemplary embodiment, the first rising period and the second rising period may be set to a minimum rising period Tbmin and a maximum rising period Tbmax, respectively, of the plurality of rising periods, and the intermediate rising period may be a midpoint rising period Tbmid between the minimum rising period Tbmin and the maximum rising period Tbmax, that is, the midpoint rising period is located at a midpoint position between the minimum rising period Tbmin and the maximum rising period Tbmax.
Equally dividing the minimum rising time period Tbmin and the maximum rising time period Tbmax into four equal parts to obtain an equal value delta T= (Tbmax-Tbmid)/4, and calculating midpoint rising time periods Tbmid and Tbmid = (Tbmax+ Tbmid)/2 through the minimum rising time period Tbmin and the maximum rising time period Tbmax. Of course, the minimum rising time length and the maximum rising time length can be divided into other data volumes according to specific needs, such as six equal parts, eight equal parts, and the like, which is not limited by the application.
For example, when two detection lines DE are respectively provided for each data driving circuit, 24 rising periods can be calculated for 12 data driving circuits 12. When the minimum rising period Tbmin =1 us and the maximum rising period tbmax=2 us, the equal value Δt= (2-1)/4=0.25 us, and the midpoint rising period Tbmid = (1+2)/2=1.5 us.
Dividing at least two compensation ranges according to the middle rising time length and the equal dividing value, and respectively compensating different gray scale voltages for the data signals in different compensation ranges so as to control the difference between the gray scale voltages of the data signals and the preset gray scale voltages to be in the preset range.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating the division of the rising duration of the data signal.
As shown in fig. 8, taking an example of quartering between the minimum rising period Tbmin and the maximum rising period Tbmax, a range in which the interval between the rising period value and the midpoint rising period Tbmid is equal to or less than one quarter Δt is set as a first compensation range, that is, the first compensation range is (Tbmid ±Δt), a range in which the interval between the rising period value and the midpoint rising period Tbmid is greater than one quarter Δt and equal to or less than at least two quarter Δt is set as a second compensation range, in other words, a range in which the interval between the midpoint rising period Tbmid is greater than one quarter Δt and equal to or less than the quarter Δt corresponds to the maximum rising period Tbmax or the minimum rising period Tbmin, that is, the second compensation ranges are (Tbmin, tbmid- Δt) and (Tbmid +Δt, tbmax).
The data signals with rising time length Ta in a first compensation range, namely (Tbmid +/-delta T), are compensated for first gray scales, the data signals with rising time length Ta in a second compensation range, namely (Tbmin, tbmid-delta T) and (Tbmid +delta T, tbmax) are compensated for second gray scales, the rising time lengths corresponding to all the data signals are close to the midpoint rising time length Tbmid, and therefore the difference of charging time of each data signal is in a certain range, and the uniformity of image display is improved.
The first compensation range includes a first sub-compensation range and a second sub-compensation range, the first sub-compensation range is a range adjacent to one side of the minimum rising duration Tbmin and spaced apart from the midpoint rising duration Tbmid by equal to or less than an equal value Δt, i.e., (Tbmid- Δt), and the second sub-compensation range is a range adjacent to one side of the maximum rising duration Tbmax and spaced apart from the midpoint rising duration Tbmid by equal to or less than an equal value Δt, i.e., (Tbmid +Δt).
The second compensation range includes a third sub-compensation range and a fourth sub-compensation range, the third sub-compensation range is a range of greater than one equal value Δt and equal to or less than at least two equal values Δt adjacent to one side of the minimum rising period Tbmin and spaced apart from the midpoint rising period Tbmid, and when the minimum rising period Tbmin and the maximum rising period Tbmax are divided into four equal parts, the third sub-compensation range is a range of greater than one equal value Δt and equal to or less than the equal value Δt to the minimum rising period Tbmin adjacent to one side of the minimum rising period Tbmin and spaced apart from the midpoint rising period Tbmid (Tbmin, tbmid- Δt). The fourth sub-compensation range is a range of equal to or less than at least two equal-dividing values Δt adjacent to one side of the maximum rising period Tbmax and spaced from the midpoint rising period Tbmid by equal-dividing values Δt, and when the minimum rising period Tbmin and the maximum rising period Tbmax are divided into four equal-dividing values, the fourth sub-compensation range is a range of equal-dividing values equal to or less than one equal-dividing value Δt equal to or greater than one equal-dividing value Δt to the maximum rising period Tbmax adjacent to one side of the maximum rising period Tbmax and spaced from the midpoint rising period Tbmid (Tbmid +Δt, tbmax).
When the rising duration Ta of the data signal is detected to be in the first sub-compensation range, compensating the data signal for the negative first gray level, namely controlling the corresponding data signal to reduce the first gray level, and when the rising duration Ta is detected to be in the second sub-compensation range, compensating the corresponding data signal for the positive first gray level, namely controlling the corresponding data signal to increase the first gray level. When the rising duration Ta is in the third sub-compensation range, compensating the negative second gray level for the corresponding data signal, namely controlling the corresponding data signal to reduce the second gray level, and when the rising duration Ta is in the fourth compensation range, compensating the positive second gray level for the corresponding data signal, namely controlling the corresponding data signal to increase the second gray level.
Corresponding preset gray scale ranges are set between the minimum rising duration Tbmin and the maximum rising duration Tbmax, and a first reference gray scale, a midpoint reference gray scale and a second reference gray scale are determined, wherein the first reference gray scale is a gray scale value corresponding to the minimum rising duration Tbmin, the midpoint reference gray scale is a gray scale corresponding to the midpoint rising duration, the second reference gray scale is a gray scale value corresponding to the maximum rising duration Tbmax, and the first reference gray scale, the midpoint reference gray scale and the second reference gray scale are sequentially increased. The first gray level and the second gray level are located between the first reference gray level and the midpoint reference gray level, and the first gray level is smaller than the second gray level.
For example, when the minimum rise time period Tbmin =1 us and the maximum rise time period tbmax=2 us, the minimum rise time period Tbmin and the maximum rise time period Tbmax are divided into four equal parts, and the equal value Δt= (2-1)/4=0.25 us, wherein the midpoint rise time period Tbmid = (1+2)/2=1.5 us.
The first compensation range is 1.25 to 1.75us, and the second compensation range is 1 to 1.25us and 1.75 to 2us. If the detected plurality of rising durations are 1.1us, the second rising duration is 1.3us, the third rising duration is 1.7us, and the fourth rising duration is 1.9us … …, wherein the first rising duration is 1.1us and is located in a second compensation range of 1 us-1.25 us, so that the second gray scale is compensated, the second rising duration is 1.3us and is located in a first compensation range of 1.25 us-1.75 us, so that the first gray scale is compensated, the third rising duration is 1.7us and is located in a first compensation range of 1.25 us-1.75 us, so that the first gray scale is compensated, and the fourth rising duration is 1.9us and is located in a second compensation range of 1.75 us-2 us, so that the second gray scale is compensated.
The first compensation range includes a first sub-compensation range and a second sub-compensation range, the first sub-compensation range may be set to 1.25 to 1.5us, the second sub-compensation range may be set to 1.5 to 1.75us, the second compensation range includes a third sub-compensation range and a fourth sub-compensation range, the third sub-compensation range may be set to 1 to 1.25us, and the fourth sub-compensation range may be set to 1.75 to 2us. For example, the first rising time length is 1.1us in the third sub-compensation range of 1-1.25 us, so that the negative second gray scale is compensated, i.e. the corresponding data signal is controlled to reduce the second gray scale; the second rising time length is 1.3us and is 1.25 us-1.5 us in the first sub-compensation range, so that the negative first gray scale is compensated, namely the corresponding data signal is controlled to reduce the first gray scale; the third rising time length is 1.7us and is positioned in the second sub-compensation range of 1.5 us-1.75 us, so that the first gray scale in the forward direction is compensated, namely the corresponding data signal is controlled to be increased by the first gray scale; the fourth rising time length is 1.9us and is located in the fourth sub-compensation range of 1.75 us-2 us, so that the second gray scale in the forward direction is compensated, namely the corresponding data signal is controlled to be increased by the second gray scale.
For the corresponding gray scale range between the minimum rising duration Tbmin and the maximum rising duration Tbmax, namely 1 us-2 us, for example, 0-127 gray scales are set, the first reference gray scale is 0 gray scale, the second reference gray scale is 127 gray scale, the midpoint reference gray scale is 63 gray scale, at this time, the first gray scale and the second gray scale are located between 0-63 gray scales, the first gray scale can be set to 24 gray scales, and the second gray scale can be set to 48 gray scales.
In the exemplary embodiment, the gray scale range may be set to other ranges, for example, 0 to 63 gray scales or 0 to 256 gray scales, and the first gray scale and the second gray scale may be set to other gray scale values according to specific needs, for example, the first gray scale is set to 36 gray scales, the second gray scale is set to 64 gray scales, and the application is not limited thereto.
Referring to fig. 9, fig. 9 is a schematic diagram illustrating time compensation of a data signal.
As shown in fig. 9, the time length of the data signal is compensated by adjusting the on time length of the control signal TP, so as to adjust the time length of charging the pixel unit by the data signal, and by increasing the time length of the control signal TP, so as to compensate the effective charging time length Tb of the data signal, wherein the control signal TP is used for controlling the data signal output, when the control signal TP is at a high level, the data signal output by the data driving circuit 12 is transmitted to the pixel unit, so as to control the pixel unit to perform image display, and when the control signal TP is at a low level, the data signal output by the data driving circuit 12 is stopped being transmitted to the pixel unit.
For example, when the control signal becomes the first control signal TP1 for the initial control signal TP0, the on-time of the control signal is increased by t, so that the duration of the Data signal Data is also increased by t, thereby increasing the effective charge duration of the Data signal Data.
And determining a first compensation range and a second compensation range according to the midpoint rising time length and the equal value, compensating the data signals with the rising time length in the first compensation range for a first charging time length t1, and compensating the data signals with the rising time length in the second compensation range for a second charging time length t2.
Taking an example of quartering between the minimum rising period Tbmin and the maximum rising period Tbmax, a range spaced apart from the midpoint rising period Tbmid by one equal value Δt or less is set as a first compensation range, i.e., the first compensation range is (Tbmid ±Δt), and a range spaced apart from the midpoint rising period Tbmid by one equal value Δt or more and equal to or less than the maximum rising period and the minimum rising period is set as a second compensation range, i.e., the second compensation ranges are (Tbmin, tbmid- Δt) and (Tbmid +Δt, tbmax).
The data signals with rising time length Ta in a first compensation range, namely (Tbmid +/-delta T), are compensated for first charging time length, and the data signals with rising time length Ta in a second compensation range, namely (Tbmin, tbmid-delta T) and (Tbmid +delta T, tbmax) are compensated for second charging time length, so that all rising time lengths approach to midpoint rising time length, the difference of charging time of each data signal is in a certain range, and uniformity of image display is further improved.
The first compensation range includes a first sub-compensation range that is a range adjacent to the side of the minimum rising period Tbmin and spaced apart from the midpoint rising period Tbmid by equal to or less than an equal value Δt, i.e., (Tbmid- Δt), and a second sub-compensation range that is a range adjacent to the side of the maximum rising period Tbmax and spaced apart from the midpoint rising period Tbmid by equal to or less than an equal value Δt, i.e., (Tbmid +Δt). The second compensation range includes a third sub-compensation range that is a range (Tbmin, tbmid- Δt) adjacent to the side of the minimum rising period Tbmin and spaced apart from the midpoint rising period Tbmid by more than one equivalent Δt and equal to or less than the minimum rising period Tbmin, and a fourth sub-compensation range that is a range (Tbmid +Δt, tbmax) adjacent to the side of the maximum rising period Tbmax and spaced apart from the midpoint rising period Tbmid by more than one equivalent Δt and equal to or less than the maximum rising period Tbmax.
When the rising duration Ta is in the first sub-compensation range, compensating the negative first charging duration t1 for the corresponding data signal, that is, controlling the charging time of the corresponding data signal to decrease by the first charging duration t1, and when the rising duration Ta is in the second sub-compensation range, compensating the positive first charging duration t1 for the corresponding data signal, that is, controlling the charging duration of the corresponding data signal to increase by the first charging duration t1. When the rising duration Ta is in the third sub-compensation range, compensating the negative second charging duration t2 for the corresponding data signal, that is, controlling the charging time of the corresponding data signal to decrease by the second charging duration t2, and when the rising duration Ta is in the fourth compensation range, compensating the positive second charging duration t2 for the corresponding data signal, that is, controlling the charging time of the corresponding data signal to increase by the second charging duration t2. The first charging time period t1 is smaller than the second charging time period t2.
For example, when the minimum rise time period Tbmin =1 us and the maximum rise time period tbmax=2 us, the minimum rise time period Tbmin and the maximum rise time period Tbmax are divided into four equal parts, and the equal value Δt= (2-1)/4=0.25 us, wherein the midpoint rise time period Tbmid = (1+2)/2=1.5 us.
The first compensation range is 1.25 to 1.75us, and the second compensation range is 1 to 1.25us and 1.75 to 2us. If the detected plurality of rising time periods are 1.1us, the second rising time period is 1.3us, the third rising time period is 1.7us, and the fourth rising time period is 1.9us … …, wherein the first rising time period 1.1us is located in a second compensation range 1 us-1.25 us, so that the second charging time period t2 is compensated, the second rising time period 1.3us is located in the first compensation range 1.25 us-1.75 us, so that the first charging time period t1 is compensated, the third rising time period 1.7us is located in the first compensation range 1.25 us-1.75 us, so that the first charging time period t1 is compensated, and the fourth rising time period 1.9us is located in the second compensation range 1.75 us-2 us, so that the second charging time period t2 is compensated.
The first compensation range includes a first sub-compensation range and a second sub-compensation range, the first sub-compensation range may be set to 1.25 to 1.5us, the second sub-compensation range may be set to 1.5 to 1.75us, the second compensation range includes a third sub-compensation range and a fourth sub-compensation range, the third sub-compensation range may be set to 1 to 1.25us, and the fourth sub-compensation range may be set to 1.75 to 2us. For example, the first rising period 1.1us is located in the third sub-compensation range 1-1.25 us, so that the second charging period t2 with negative compensation is performed, that is, the charging time of the corresponding data signal is controlled to be reduced by the second charging period t2; the second rising time length 1.3us is positioned in the first sub-compensation range of 1.25 us-1.5 us, so that the first charging time length t1 in the negative direction is compensated, namely the charging time of the corresponding data signal is controlled to be reduced by the first charging time length t1; the third rising time length 1.7us is positioned in the second sub-compensation range of 1.5 us-1.75 us, so that the first charging time length t1 in the forward direction is compensated, namely the charging time of the corresponding data signal is controlled to be increased by the first charging time length t1; the fourth rising time period 1.9us is located in the fourth sub-compensation range 1.75 us-2 us, so that the second charging time period t2 in the forward direction is compensated, namely the charging time of the corresponding data signal is controlled to be increased by the second charging time period t2. The first charging duration T1 may be set between 0 and 0.25us, and the second charging duration T2 may be set between 0.25 and 0.5us, that is, in a range where the first charging duration T1 is less than or equal to one equal value Δt, and the second charging duration T2 is greater than one equal value Δt and less than or equal to two equal values. Of course, the application is not limited in this regard, and may be set according to specific needs.
The data signals output by the data driving circuits are detected, the rising time length of the corresponding data signals when the corresponding data signals are output to the pixel units for image display is obtained, and the compensation voltage is correspondingly output or the charging time of the data signals is adjusted according to the length of the rising time length of each data signal, so that the rising time length of each data signal is in a preset range or the actual charging time is in the preset range, the overall uniformity of image display is improved, and the image display effect is further improved.
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 (8)
1. The display panel comprises a pixel area formed by a time sequence control circuit, a plurality of data driving circuits and a plurality of pixel units, wherein the time sequence control circuit is connected with the data driving circuits and is used for controlling the data driving circuits to output data signals, and the data driving circuits are connected with the pixel units through first ends of a plurality of data lines and are used for outputting the data signals to the pixel units so as to drive the pixel units to display images;
the display panel is characterized by further comprising a plurality of detection lines, the detection lines are respectively connected to the data driving circuits and second ends of the data lines, wherein the data signals are transmitted from the first ends to the second ends, the detection lines are used for detecting the data signals in the data lines and transmitting the obtained detection signals to the time sequence control circuit through the data driving circuits, the time sequence control circuit determines effective charging duration of the data signals according to the detection signals and calculates to obtain rising duration according to preset reference duration and the effective charging duration, the rising duration is the duration required by the voltage of the data signals to rise to a preset voltage, the effective charging duration is the duration that the voltage of the data signals loaded to the pixel units is maintained at the preset voltage, and the preset voltage is the voltage required by the pixel units to execute image display;
the time sequence control circuit determines a first rising time length and a second rising time length in a plurality of rising time lengths, equally divides the first rising time length and the second rising time length to obtain equal values, and calculates an intermediate rising time length according to the first rising time length and the second rising time length, wherein the intermediate rising time length is positioned between the first rising time length and the second rising time length;
Dividing at least two compensation ranges according to the middle rising time length and the equal dividing value, and respectively compensating different gray scale voltages for the data signals in different compensation ranges so as to control the difference between the gray scale voltages of the data signals and the preset gray scale voltages to be within the preset range.
2. A display control method applied to the display panel of claim 1, comprising:
Receiving a plurality of detection signals from a plurality of detection lines;
the detection signals are transmitted to the time sequence control circuit through the data driving circuits, and the time sequence control circuit determines the rising time length of the data signals output by each data driving circuit according to the detection signals;
determining a first rising time length and a second rising time length in a plurality of rising time lengths, equally dividing the first rising time length and the second rising time length to obtain equal values, and calculating an intermediate rising time length according to the first rising time length and the second rising time length, wherein the intermediate rising time length is positioned between the first rising time length and the second rising time length;
Dividing at least two compensation ranges according to the middle rising time length and the equal dividing value, and respectively compensating different gray scale voltages for the data signals in different compensation ranges so as to control the difference between the gray scale voltages of the data signals and the preset gray scale voltages to be within the preset range.
3. The display control method according to claim 2, wherein,
The two compensation ranges include a first compensation range and a second compensation range,
A range of one of the equivalent values less than or equal to the interval from the intermediate rise time period is the first compensation range,
And the range which is more than one equal value and less than or equal to at least two equal values from the middle rising time length is the second compensation range.
4. The display control method according to claim 3, wherein a first compensation range and a second compensation range are determined in accordance with the intermediate rise time period and the bisector value,
Compensating a first gray level for the data signal with the rising time length in the first compensation range, compensating a second gray level for the data signal with the rising time length in the second compensation range to control the difference between the gray level voltage of the data signal and a preset gray level voltage to be within a preset range,
Or compensating a first charging time length for the data signal with the rising time length in the first compensation range, and compensating a second charging time length for the data signal with the rising time length in the second compensation range.
5. The display control method according to claim 4, wherein the first compensation range includes a first sub-compensation range that is a range adjacent to a side of a minimum rising period and spaced apart from the intermediate rising period by one of the equivalent values or less, and a second sub-compensation range that is a range adjacent to a side of a maximum rising period and spaced apart from the intermediate rising period by one of the equivalent values or less;
The second compensation range includes a third sub-compensation range and a fourth sub-compensation range, the third sub-compensation range is a range adjacent to one side of the minimum rising time period and spaced from the intermediate rising time period by more than one of the equal values and less than or equal to at least two of the equal values, and the fourth sub-compensation range is a range adjacent to one side of the maximum rising time period and spaced from the intermediate rising time period by more than one of the equal values and less than or equal to at least two of the equal values.
6. The display control method according to claim 5, wherein the rising period of the data signal is controlled to decrease the first gray level when the first sub-compensation range, the data signal is controlled to increase the first gray level when the rising period of the data signal is in the second sub-compensation range, the data signal is controlled to decrease the second gray level when the rising period of the data signal is in the third sub-compensation range, and the data signal is controlled to increase the second gray level when the rising period of the data signal is in the fourth sub-compensation range.
7. The display control method according to claim 6, wherein a first reference gray level, an intermediate reference gray level and a second reference gray level are determined for a preset gray level range corresponding to the first rising duration and the second rising duration, wherein the first reference gray level is a gray level corresponding to the first rising duration, the intermediate reference gray level is a gray level corresponding to the intermediate rising duration, the second reference gray level is a gray level corresponding to the second rising duration, the first reference gray level, the intermediate reference gray level and the second reference gray level are sequentially increased, and the first gray level and the second gray level are located between the first reference gray level and the intermediate reference gray level, and the first gray level is smaller than the second gray level.
8. The display control method according to claim 7, wherein the effective charge duration of the data signal is controlled to be reduced by the first charge duration when the rising duration of the data signal is in the first sub-compensation range, the effective charge duration of the data signal is controlled to be increased by the first charge duration when the rising duration of the data signal is in the second sub-compensation range, the effective charge duration of the data signal is controlled to be reduced by the second charge duration when the rising duration of the data signal is in the third sub-compensation range, and the effective charge duration of the data signal is controlled to be increased by the second charge duration when the rising duration of the data signal is in the fourth sub-compensation range.
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| CN115576444A (en) * | 2022-09-21 | 2023-01-06 | 武汉华星光电技术有限公司 | Touch control display panel |
| CN116072070A (en) * | 2022-11-04 | 2023-05-05 | 厦门天马显示科技有限公司 | Display panel, driving method thereof and display device |
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