CN112150975A - Display device and driving method thereof - Google Patents
Display device and driving method thereof Download PDFInfo
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- CN112150975A CN112150975A CN201910560450.9A CN201910560450A CN112150975A CN 112150975 A CN112150975 A CN 112150975A CN 201910560450 A CN201910560450 A CN 201910560450A CN 112150975 A CN112150975 A CN 112150975A
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- 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
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Abstract
The invention relates to a display device, comprising a backlight source and a display panel positioned at the light-emitting side of the backlight source, comprising: the backlight pulse width modulation signal acquisition unit is used for acquiring a backlight pulse width modulation signal input to the backlight source; the time sequence control unit is connected with the backlight pulse width modulation signal acquisition unit and used for receiving the backlight pulse width modulation signal and outputting a delay control signal when the backlight pulse width modulation signal is at a low level; and the source electrode driving unit is connected with the time sequence control unit and is used for providing data voltage for the data line according to the delay control signal delay preset time. The invention also relates to a driving method of the display device.
Description
Technical Field
The invention relates to the technical field of liquid crystal product manufacturing, in particular to a display device and a driving method thereof.
Background
With the rapid development of the display panel field, the demand of people for large-size high-resolution display panels is increasing day by day, and the requirements for the display effect of display panel products are higher and higher. With the improvement of the size and resolution of a display panel, the panel process faces challenges, because most of the current TV complete machine backlight systems adopt PWM (Pulse Width Modulation) to control the brightness, the backlight source switches between high and low levels according to a certain frequency and a duty ratio, the backlight brightness is controlled by adjusting the duty ratio, human eyes cannot recognize due to the high frequency, but under the conditions of a backlight bright state and a backlight dark state, the influence of illumination on the conductor characteristics of an Array Active layer (Active layer) is generated, so that the Data (Data line) voltage RC Delay (Delay) has differences, and the horizontal wave similar to waterfall lines on the panel is bad, and the picture display effect is influenced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a display device and a driving method thereof, which solves the problem of poor horizontal waterfall similar to waterfall lines generated on a panel.
In order to achieve the purpose, the invention adopts the technical scheme that: a display device comprising a backlight and a display panel at a light exit side of the backlight, comprising:
the backlight pulse width modulation signal acquisition unit is used for acquiring a backlight pulse width modulation signal input to the backlight source;
the time sequence control unit is connected with the backlight pulse width modulation signal acquisition unit and used for receiving the backlight pulse width modulation signal and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and the source electrode driving unit is connected with the time sequence control unit and is used for providing data voltage for the data line according to the delay control signal delay preset time.
Optionally, the display device further includes an optical processing unit, configured to test a first luminance value of a bright-state area of the display panel and a second luminance value of a dark-state area of the display panel when data voltages of all pixel units of the display panel are the same, and compare the first luminance value with the second luminance value, where the first luminance value is greater than a first preset threshold, and the second luminance value is smaller than the first preset threshold;
the time sequence control unit is also used for adjusting the delay control signal according to the comparison result of the optical processing unit so as to adjust the preset time.
Optionally, the optical processing unit includes:
a brightness acquisition section for acquiring the first brightness value and the second brightness value;
and the comparison part is used for comparing the first brightness value with the second brightness value, sending a first signal to the time sequence control unit when the difference value between the first brightness value and the second brightness value exceeds a second preset threshold value, and sending a second signal to the time sequence control unit when the difference value between the first brightness value and the second brightness value is smaller than the second preset threshold value.
Optionally, the optical processing unit further includes:
a brightness acquisition section for acquiring the first brightness value and the second brightness value;
a luminance-voltage converting section for converting the first luminance value into a first voltage value and converting the second luminance value into a second voltage value;
and the comparison part is used for comparing the first voltage value with the second voltage value, sending the first signal to the time sequence control unit when the difference value of the first voltage value and the second voltage value is greater than a reference voltage, and sending the second signal to the time sequence control unit when the difference value of the first voltage value and the second voltage value is less than or equal to the reference voltage.
The invention also provides a driving method of the display device, which is applied to the display device and comprises the following steps:
collecting a backlight pulse width modulation signal input to a backlight source;
receiving the backlight pulse width modulation signal, and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and providing the data voltage to the data line by delaying the preset time according to the delay control signal.
Optionally, the method further includes:
when the data voltages of all pixel units of the display panel are the same, acquiring a first brightness value of a bright-state area of the display panel and a second brightness value of a dark-state area of the display panel;
comparing the first brightness value with the second brightness value, and sending a first signal when the difference between the first brightness value and the second brightness value exceeds a first preset threshold, and sending a second signal when the difference between the first brightness value and the second brightness value is less than or equal to the first preset threshold;
adjusting the delay control signal according to the first signal, or saving a corresponding delay control signal according to the second signal.
Optionally, the method further includes:
when the data voltages of all pixel units of the display panel are the same, acquiring a first brightness value of a bright-state area of the display panel and a second brightness value of a dark-state area of the display panel;
converting the first brightness value into a first voltage value and converting the second brightness value into a second voltage value;
comparing the first voltage value with the second voltage value, and sending a first signal when the difference value between the first voltage value and the second voltage value is greater than a reference voltage, and sending a second signal when the difference value between the first voltage value and the second voltage value is less than or equal to the reference voltage;
adjusting the delay control signal according to the first signal, or saving a corresponding delay control signal according to the second signal.
Optionally, adjusting the delay control signal according to the first signal specifically includes:
and outputting a second delay control signal different from the first delay control signal output last time according to the first signal so as to change a first preset time corresponding to the first delay control signal into a second preset time corresponding to the second delay control signal, wherein the second preset time is greater than the first preset time.
Optionally, a difference between the first preset time and the second preset time is a minimum delay time step preset by the timing control unit.
The invention has the beneficial effects that: the time sequence control chip receives a low level signal of the backlight pulse width modulation signal acquisition unit and outputs a delay control signal, and the source electrode driving unit delays preset time according to the delay control signal and provides data voltage for the data line, so that the backlight source is ensured to be in two states of no illumination, and no brightness change exists in image display.
Drawings
FIG. 1 is a schematic diagram showing a state where an active layer generates a conductive characteristic under illumination;
FIG. 2 is a schematic view showing a state where the active layer has no conductive property in the absence of light;
FIG. 3 is a schematic diagram showing the charging difference of pixel voltages caused by the presence or absence of illumination;
FIG. 4 is a schematic diagram of a backlight pulse width modulation signal of a backlight source;
FIG. 5 is a schematic diagram of a backlight PWM signal corresponding to a bright-state region and a dark-state region;
FIG. 6 is a schematic diagram of a display device according to an embodiment of the present invention;
FIG. 7 is a timing diagram illustrating a source driving unit providing data voltages;
FIG. 8 is a schematic diagram showing the charging time of the source driving unit for supplying data voltages to the data lines;
FIG. 9 is a schematic diagram of the operation of the optical processing unit;
FIG. 10 is a schematic diagram illustrating the adjustment of the delay control signal output by the timing control unit;
FIG. 11 is a diagram illustrating states of delay control signals preset by the timing control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Currently, most of the backlight systems of the TV complete machines control brightness by using PWM (Pulse Width Modulation), a backlight source performs high-low level switching according to a certain frequency and duty ratio, and controls backlight brightness by adjusting the duty ratio, as shown in fig. 4, a backlight PWM period is T, high level time is H (bright state of backlight at this time) and low level time is L (dark state of backlight at this time) in one period, because of higher frequency, human eyes cannot recognize bright-dark switching, and intelligently perceive overall brightness, and further, at present, backlight brightness is changed by adjusting the duty ratio of high and low levels, and overall brightness is higher when H duty ratio is larger; the lower the reverse. However, in the bright state and the dark state of the backlight, the presence or absence of light affects the conductor characteristics of the Array Active layer (Active layer), referring to fig. 1-3, the Data line 02 is located above the Active layer 01, and the orthographic projection of the Data line 02 on the Active layer 01 completely falls into the Active layer 01, in the bright state of the backlight, the light affects the conductor characteristics of the Active layer 01, the Active layer 01 below the Data line 02 has the conductor characteristics under the light (the pattern filling area in fig. 1 is a conductive area), resulting in the difference of Data Delay (the Delay of the time for providing the Data voltage) under the condition of the presence or absence of light, the difference is related to the size of the Active tail (the portion 03 of the Active layer exposed to the Data line), in fig. 2, the Active layer 01 has no conductive characteristic, so that the difference of the Data voltage RC Delay exists, the horizontal waterfall like defect is generated on the panel, affecting the picture display effect.
To solve the above technical problem, the present embodiment provides a display device, as shown in fig. 6, specifically including a backlight and a display panel 1 located on a light emitting side of the backlight, including:
the backlight pulse width modulation signal acquisition unit is used for acquiring a backlight pulse width modulation signal input to the backlight source;
the time sequence control unit 2 is connected with the backlight pulse width modulation signal acquisition unit and used for receiving the backlight pulse width modulation signal and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and the source driving unit 3 is connected with the timing control unit 2 and is used for providing data voltage for the data line according to the delay control signal delay preset time.
The time sequence control unit 2 receives a low level signal of the backlight pulse width modulation signal acquisition unit, controls the source electrode driving unit 3 to Delay a preset time to provide data voltage for the data line, and when the time sequence control unit 2 receives a high level signal of the backlight pulse width modulation signal acquisition unit, the time sequence control unit does not Delay, further controls the source electrode driving unit 3 to Delay the time of providing the data voltage for the data line when the backlight source is in a high level state, and delays the preset time to provide the data voltage for the data line when the backlight source is in a low level state, so that the difference of the data line voltage RC Delay under the illumination condition is eliminated, the waterfall line defect disappears, and the picture display effect is finally improved.
Fig. 3 is a schematic diagram of a Data Delay in the presence or absence of illumination of the backlight, in the absence of illumination, the Delay is not generated, the charging time is sufficient, the charging rate is high, the actual pixel voltage is high, and the luminance displayed on the display panel 1 is high, referring to the waveform represented by 002 in fig. 3; however, when the same data voltage is supplied to the data lines, there is a time delay when the data lines are illuminated, the actual charging time is shorter than that when no illumination is applied, the actual pixel voltage is lower, and the luminance displayed on the display panel 1 is lower, as shown by a waveform indicated by 001 in fig. 3, and a difference region with or without illumination contrast is indicated by a dotted line region. Further, a horizontal Block, i.e., a Water fall (waterfall) defect due to a luminance difference may occur on the display panel 1. Fig. 5 shows schematic diagrams of backlight pulse width modulation signals corresponding to a bright state area and a dark state area, wherein (i) the area on the display panel 1 has relatively low brightness, the backlight pulse width modulation signal in the area is in an H state, and (ii) the area has relatively high brightness, and the backlight pulse width modulation signal in the area is in an L state.
As shown in fig. 7, when the backlight source is in a dark state, the timing control unit 2 receives the backlight pwm signal collected by the backlight pwm signal collecting unit and outputs the Delay control signal when the backlight pwm signal is a low level signal, the source driving unit 3 outputs Delay according to the Delay control signal for a certain time, that is, the source driving unit 3 delays the preset time to provide the data voltage to the data line, as a dotted line 10 in fig. 7 represents a waveform for delaying the provision of the data voltage, and 003 in fig. 7 represents a delayed time period, which corresponds to the waveform 100 in the non-illuminated state in fig. 8, and the charging start time of the pixel is delayed by a time period denoted by 004, which corresponds to the time period 003 in fig. 7; when the backlight source is in the bright state, no Delay is performed, that is, the source driving unit 3 supplies the data voltage to the data line without Delay under the control of the timing control unit 2, as solid line 20 in fig. 7 represents a waveform without delay, corresponding to waveform 200 in fig. 8 in the illuminated state at this time, since the conductive nature of the active layer causes a delay in the pixel charging time in the illuminated state, in this embodiment, under the non-illumination state, the source driving unit provides a data voltage to the data line with a delay of a preset time under the control of the timing control unit, the actual charging time of the pixel in both the bright and dark states of the backlight is just made comparable, comparing fig. 8 with fig. 3, it is also obvious that the actual charging time of the pixel in the two states in fig. 8 is the same, so as to ensure that there is no brightness change in the image display in the two states.
In a specific implementation manner of this embodiment, the timing control unit 2 includes a timing control chip, but is not limited thereto.
In a specific implementation manner of this embodiment, the source driving unit 3 includes a source driving chip, but is not limited thereto.
In this embodiment, the display device further includes an optical processing unit 4, configured to test a first luminance value of a bright-state area of the display panel 1 and a second luminance value of a dark-state area of the display panel 1 when data voltages of all pixel units of the display panel 1 are the same, and compare the first luminance value with the second luminance value, where the first luminance value is greater than a first preset threshold, and the second luminance value is smaller than the first preset threshold;
the timing control unit 2 is further configured to adjust the delay control signal according to the comparison result of the optical processing unit 4 to adjust the preset time.
In order to effectively achieve the uniformity of the brightness of the display panel 1, it is required to accurately obtain the preset time of the delay required by the source driving unit 3 to supply the data voltage to the data lines, and in this embodiment, a delay control signal is outputted at the timing control unit 2 so that the source driving unit 3 supplies the data voltage to the data lines with a delay of a preset time according to the delay control signal, and in order to determine whether the preset time is effective to achieve the brightness uniformity of the display panel 1, the first luminance value of the bright-state area of the display panel 1 and the second luminance value of the dark-state area of the display panel 1 are tested by the optical processing unit 4, and comparing the first brightness value with the second brightness value, wherein the timing control unit 2 adjusts the delay control signal according to the comparison result of the optical processing unit 4 to adjust the preset time until the delay of the preset time can effectively realize uniform brightness of the display panel 1.
In this embodiment, the optical processing unit 4 may be external or integrated with the timing control unit 2, and when the timing control unit 2 includes a timing control chip, the optical processing unit 4 may be integrated on the timing control chip, but not limited thereto.
In this embodiment, the optical processing unit 4 includes:
a luminance collecting section 41 for collecting the first luminance value and the second luminance value;
a comparing part 43, configured to compare the first luminance value with the second luminance value, send a first signal to the timing control unit when a difference between the first luminance value and the second luminance value exceeds a second preset threshold, and send a second signal to the timing control unit when the difference between the first luminance value and the second luminance value is less than or equal to the second preset threshold.
In this embodiment, when the comparing part 43 sends the first signal, the timing control unit 2 outputs a delay control signal different from the delay control signal output last time, so as to change the preset time;
when the comparing part 43 sends out the second signal, the timing control unit 2 stores the corresponding delay control signal.
Selecting a plurality of optical test points (3 listed areas in fig. 6) on the display panel 1, covering dark and bright areas, collecting brightness values of each point by a color analyzer (the brightness collection part 41 comprises the color analyzer), processing the collected brightness values by a comparison part 43, comparing the brightness values of each point by the comparison part 43 if there is a difference, feeding back to the timing control unit 2 to adjust a delay control signal (i.e. the comparison part 43 outputs a first signal), i.e. adjusting the preset time that the source driving unit 3 delays providing a data voltage to a data line, collecting brightness changes of the test points on the display panel 1 in real time after adjustment, comparing again, and repeating the process until the brightness difference is less than or equal to a preset reference value, feeding back to the timing control unit 2 a high level (i.e. the comparison part 43 outputs a second signal), the timing control unit 2 stores the Data Delay value (that is, the timing control unit 2 stores the Delay control signal output last time), and then, when the modulation signal input to the backlight source and collected by the backlight pulse width modulation signal collection unit is at a low level, the source driving unit 3 is directly controlled according to the Delay control signal stored in the timing control unit 2.
In a specific implementation manner of this embodiment, the optical processing unit 4 further includes:
a luminance collecting section 41 for collecting the first luminance value and the second luminance value;
a luminance-voltage converting section 42 for converting the first luminance value into a first voltage value and converting the second luminance value into a second voltage value;
the comparing unit 43 is further configured to compare the first voltage value with the second voltage value, and to send the first signal when a difference between the first voltage value and the second voltage value is greater than a reference voltage, and send the second signal when the difference between the first voltage value and the second voltage value is less than or equal to the reference voltage.
Fig. 9 shows a schematic view of the operation principle of the optical processing unit 4, the brightness values of the respective points collected on the display panel 1 by the brightness collecting section and indicated as L1-Ln, the luminance values L1-Ln are converted into voltage values by the luminance-voltage converting section, respectively, and are represented as V1-Vn, when the difference between two adjacent voltage values of V1 to Vn is smaller than Vref (reference voltage), the comparison section 43 outputs a high potential (i.e., the comparison section 43 outputs the second signal), the timing control unit 2 registers a Delay value, that is, the timing control unit 2 holds the delay control signal outputted at the previous time, when the difference between two adjacent voltage values of V1 to Vn is greater than Vref, the comparing portion 43 outputs a low level (i.e. the comparing portion 43 outputs the first signal), and the timing control unit 2 needs to adjust the Delay value in time (i.e. the timing control unit 2 needs to output a Delay control signal different from the previous output).
In this embodiment, the difference between the preset times corresponding to the delay control signals output by the timing control unit 2 two times in the vicinity is the minimum delay time step length preset by the timing control unit 2.
When the comparing part 43 sends the first signal, the timing control unit 2 outputs a delay control signal different from the previously output delay control signal to change the preset time, that is, outputs a second delay control signal different from the previously output first delay control signal according to the first signal to change the first preset time corresponding to the first delay control signal into a second preset time corresponding to the second delay control signal, where the second preset time is greater than the first preset time. Specifically, after the timing control unit 2 outputs a second delay control signal different from a first delay control signal output last time, the optical processing unit tests a first brightness value of a bright-state area of the display panel 1 and a second brightness value of a dark-state area of the display panel 1 again, compares the first brightness value with the second brightness value, and when the comparison unit 43 sends the second signal, the timing control unit 2 stores the corresponding delay control signal, so that when the modulation signal input to the backlight source and collected by the backlight pulse width modulation signal collection unit is at a low level, the timing control unit 2 can directly output the stored delay control signal.
And the timing control unit 2 adjusts the delay control signal, that is, outputs a delay control signal different from the previously output delay control signal in cycles before precisely obtaining the desired delay control signal, to change the preset time: according to the minimum delay time step (i.e. the time step a in fig. 10) preset by the timing control unit 2, the minimum delay time step is gradually overlapped on the basis of the previous preset time, for example, the preset time corresponding to the first delay control signal output last time is the first preset time, and then the second preset time corresponding to the second delay control signal output currently is the time step a added on the basis of the first preset time until the preset time (i.e. the delay control signal) meets the requirement of the brightness difference value of each point collected on the display panel 1, as shown in fig. 10, the signal corresponding to the time period b in fig. 10 is a low level signal (i.e. the first signal sent by the comparison portion), and the signal corresponding to the time period c is a high level signal (i.e. the second signal sent by the comparison portion).
The timing control unit 2 controls the source driving unit 3 to delay a preset time to supply the data voltage to the data line in the following manner: the timing control unit 2 transmits the Delay control signal to the source driving unit 3 through a Point-to-Point (Point-to-Point transmission protocol) interface, as shown in fig. 11, the Delay control signal output by the timing control unit 2 includes N control signals, for example, N is 4, which are respectively control signals A, B, C, D, each of which has 16 high and low potentials respectively representing 0-15-order Delay control signals, the minimum Delay time step is 1/16, and the 0-15-order Delay control signals are sequentially output before the optimal Delay value is not obtained. The source driving unit 3 controls the Switch of the output OP according to the delay control signal to realize the delay of providing the data voltage, and 1Step (1 delay time Step) is 1 UI.
The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet personal computer and the like, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
The present embodiment further provides a driving method of a display device, applied to the display device, including the following steps:
collecting a backlight pulse width modulation signal input to a backlight source;
receiving the backlight pulse width modulation signal, and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and providing the data voltage to the data line by delaying the preset time according to the delay control signal.
The time sequence control unit receives a low level signal of the backlight pulse width modulation signal acquisition unit, controls the source electrode driving unit to Delay preset time to provide data voltage for the data line, and when the time sequence control unit receives a high level signal of the backlight pulse width modulation signal acquisition unit, the time sequence control unit does not Delay, further controls the source electrode driving unit to Delay the time of providing the data voltage for the data line when the backlight source is in a high level state, and delays the preset time to provide the data voltage for the data line when the backlight source is in a low level state, so that the difference of the data line voltage RC Delay under the illumination condition is eliminated, the waterfall line defect disappears, and the picture display effect is finally improved.
In this embodiment, the display device driving method further includes:
when the data voltages of all pixel units of the display panel are the same, acquiring a first brightness value of a bright-state area of the display panel and a second brightness value of a dark-state area of the display panel;
comparing the first brightness value with the second brightness value, and sending a first signal when the difference between the first brightness value and the second brightness value exceeds a first preset threshold, and sending a second signal when the difference between the first brightness value and the second brightness value is less than or equal to the first preset threshold;
adjusting the delay control signal according to the first signal, or saving a corresponding delay control signal according to the second signal.
In this embodiment, the step of comparing the first luminance value and the second luminance value further includes:
converting the first brightness value into a first voltage value and converting the second brightness value into a second voltage value;
and comparing the first voltage value with the second voltage value, and sending out a first signal when the difference value between the first voltage value and the second voltage value is greater than a reference voltage, and sending out a second signal when the difference value between the first voltage value and the second voltage value is less than or equal to the reference voltage.
In this embodiment, adjusting the delay control signal according to the first signal specifically includes:
and outputting a delay control signal different from the previously output delay control signal according to the first signal to change the preset time.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A display device including a backlight and a display panel located on a light exit side of the backlight, comprising:
the backlight pulse width modulation signal acquisition unit is used for acquiring a backlight pulse width modulation signal input to the backlight source;
the time sequence control unit is connected with the backlight pulse width modulation signal acquisition unit and used for receiving the backlight pulse width modulation signal and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and the source electrode driving unit is connected with the time sequence control unit and is used for providing data voltage for the data line according to the delay control signal delay preset time.
2. The display device according to claim 1, further comprising an optical processing unit for testing a first luminance value of a bright-state area of the display panel and a second luminance value of a dark-state area of the display panel when data voltages of all pixel cells of the display panel are the same, wherein the first luminance value is greater than a first preset threshold value, and the second luminance value is less than the first preset threshold value, and comparing the first luminance value with the second luminance value;
the time sequence control unit is also used for adjusting the delay control signal according to the comparison result of the optical processing unit so as to adjust the preset time.
3. The display device according to claim 2, wherein the optical processing unit comprises:
a brightness acquisition section for acquiring the first brightness value and the second brightness value;
and the comparison part is used for comparing the first brightness value with the second brightness value, sending a first signal to the time sequence control unit when the difference value between the first brightness value and the second brightness value exceeds a second preset threshold value, and sending a second signal to the time sequence control unit when the difference value between the first brightness value and the second brightness value is smaller than the second preset threshold value.
4. The display device according to claim 2, wherein the optical processing unit further comprises:
a brightness acquisition section for acquiring the first brightness value and the second brightness value;
a luminance-voltage converting section for converting the first luminance value into a first voltage value and converting the second luminance value into a second voltage value;
and the comparison part is used for comparing the first voltage value with the second voltage value, sending a first signal to the time sequence control unit when the difference value of the first voltage value and the second voltage value is greater than a reference voltage, and sending a second signal to the time sequence control unit when the difference value of the first voltage value and the second voltage value is less than or equal to the reference voltage.
5. A driving method of a display device applied to the display device according to any one of claims 1 to 4, comprising the steps of:
collecting a backlight pulse width modulation signal input to a backlight source;
receiving the backlight pulse width modulation signal, and outputting a delay control signal when the backlight pulse width modulation signal is at a low level;
and providing the data voltage to the data line by delaying the preset time according to the delay control signal.
6. The method for driving a display device according to claim 5, further comprising:
when the data voltages of all pixel units of the display panel are the same, acquiring a first brightness value of a bright-state area of the display panel and a second brightness value of a dark-state area of the display panel;
comparing the first brightness value with the second brightness value, and sending a first signal when the difference between the first brightness value and the second brightness value exceeds a first preset threshold, and sending a second signal when the difference between the first brightness value and the second brightness value is less than or equal to the first preset threshold;
adjusting the delay control signal according to the first signal, or saving a corresponding delay control signal according to the second signal.
7. The method for driving a display device according to claim 5, further comprising:
when the data voltages of all pixel units of the display panel are the same, acquiring a first brightness value of a bright-state area of the display panel and a second brightness value of a dark-state area of the display panel;
converting the first brightness value into a first voltage value and converting the second brightness value into a second voltage value;
comparing the first voltage value with the second voltage value, and sending a first signal when the difference value between the first voltage value and the second voltage value is greater than a reference voltage, and sending a second signal when the difference value between the first voltage value and the second voltage value is less than or equal to the reference voltage;
adjusting the delay control signal according to the first signal, or saving a corresponding delay control signal according to the second signal.
8. The method according to claim 6 or 7, wherein adjusting the delay control signal according to the first signal specifically comprises:
and outputting a second delay control signal different from the first delay control signal output last time according to the first signal so as to change a first preset time corresponding to the first delay control signal into a second preset time corresponding to the second delay control signal, wherein the second preset time is greater than the first preset time.
9. The method according to claim 8, wherein a difference between the first preset time and the second preset time is a minimum delay time step preset by a timing control unit.
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