CN116486756A - Display device and driving method thereof - Google Patents

Display device and driving method thereof Download PDF

Info

Publication number
CN116486756A
CN116486756A CN202310467791.8A CN202310467791A CN116486756A CN 116486756 A CN116486756 A CN 116486756A CN 202310467791 A CN202310467791 A CN 202310467791A CN 116486756 A CN116486756 A CN 116486756A
Authority
CN
China
Prior art keywords
mini
circuit
liquid crystal
crystal display
display panel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310467791.8A
Other languages
Chinese (zh)
Inventor
杨可
袁海江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HKC Co Ltd
Original Assignee
HKC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HKC Co Ltd filed Critical HKC Co Ltd
Priority to CN202310467791.8A priority Critical patent/CN116486756A/en
Publication of CN116486756A publication Critical patent/CN116486756A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The application discloses a display device and a driving method thereof, wherein the driving method of the display device comprises the following steps: taking the area where a grid driving circuit is positioned in a mini-LED liquid crystal display panel as a circuit area, and detecting the temperature condition of the circuit area; judging the magnitude relation between the temperature condition of the circuit area and a preset temperature condition; when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, the mini-LED liquid crystal display panel displays normally; reducing current through the gate drive circuit; and reducing the light-emitting brightness of the mini-LED corresponding to the circuit area. By the driving method, the light leakage problem at the corner of the mini-LED liquid crystal display panel can be avoided when the dark state picture is displayed.

Description

Display device and driving method thereof
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
Background
Along with the development of display technology, the requirements on the display effect and the panel frame are higher and higher, and the mini-LED has the advantages of high contrast, high brightness and the like, so that the display matched with the mini-LED has good display effect, and is more and more widely used. In addition, the array substrate row gate driving circuit (Gate Driver on Array, GOA) technology is a mode of manufacturing a gate driving circuit on an array substrate to realize progressive scanning, is generally used in a liquid crystal panel, has the advantages of reducing production cost and realizing narrow frame design of the panel, and is used for various displays.
At present, in order to improve the display effect of the display device and reduce the frame of the panel, mini-LEDs and GOA technology are generally matched for use in a liquid crystal panel, but the problem of corner light leakage in dark state can occur, and the display effect is affected.
Disclosure of Invention
The present disclosure provides a display device and a driving method thereof, which can solve the problem of light leakage caused by corner falling of a liquid crystal panel with mini-LEDs and employing GOA technology in dark state.
The application discloses a display device's drive method, display device includes mini-LED liquid crystal display panel and gate drive circuit, gate drive circuit sets up on the array substrate of mini-LED liquid crystal display panel, display device's drive method includes the step:
taking the area where a grid driving circuit is positioned in a mini-LED liquid crystal display panel as a circuit area, and detecting the temperature condition of the circuit area;
judging the magnitude relation between the temperature condition of the circuit area and a preset temperature condition;
when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, the mini-LED liquid crystal display panel displays normally;
reducing current through the gate drive circuit; and
and reducing the light-emitting brightness of the mini-LED corresponding to the circuit area.
Optionally, in the step of detecting the temperature condition of a circuit area by taking the area where a gate driving circuit is located in the mini-LED liquid crystal display panel as the circuit area, detecting the temperature of the circuit area and the duration of the temperature to obtain a first temperature and a first time;
in the step of judging the magnitude relation between the temperature condition of the circuit area and the preset temperature condition, judging the magnitude relation between the first temperature and the first preset temperature and the magnitude relation between the first time and the first preset time;
when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, in the step of normally displaying the mini-LED liquid crystal display panel, when the first temperature is larger than or equal to the first preset temperature and the first time is larger than or equal to the first preset time, carrying out the subsequent steps; and when the first temperature is smaller than the first preset temperature and/or the first time is smaller than the first preset time, the mini-LED liquid crystal display panel displays normally.
Optionally, when the first temperature is less than the first preset temperature and the first time is less than the first preset time, the gate driving circuit is connected through a first circuit; when the first temperature is greater than or equal to the first preset temperature and/or the first time is greater than or equal to the first preset time, the gate driving circuit is connected through a second circuit; the resistance value of the second circuit is larger than that of the first circuit.
Optionally, after the step of reducing the current through the gate driving circuit, the method further comprises the step of:
compensating the charging time of the mini-LED liquid crystal display panel to enable the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time;
and the first charging time is the charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the temperature condition of the circuit area is smaller than the preset temperature condition and the mini-LED liquid crystal display panel displays normally.
Optionally, in the step of compensating the charging time of the mini-LED liquid crystal display panel and restoring the charging time of the mini-LED liquid crystal display panel to the first charging time, the method includes:
recording a first charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the mini-LED liquid crystal display panel displays normally;
detecting the second charging time of the grid driving circuit to the mini-LED liquid crystal display panel after the current passing through the grid driving circuit is reduced;
comparing the second charging time with the first charging time; and
when the second charging time is smaller than the first charging time, compensating the difference value between the first charging time and the second charging time into the mini-LED liquid crystal display panel, and enabling the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time.
Optionally, the first preset temperature is 45 degrees, and the first preset time is 1 second.
Optionally, the display device adopts a pulse width modulation method to adjust light, and in the step of reducing the light-emitting brightness of the mini-LED corresponding to the circuit area, the light-emitting brightness of the mini-LED corresponding to the circuit area is reduced by reducing the duty ratio when the light-emitting brightness of the mini-LED corresponding to the circuit area is adjusted by adopting the pulse width modulation method.
The application also discloses a display device which is driven by adopting the driving method of the display device, wherein the display device comprises a mini-LED liquid crystal display panel, a grid driving circuit, a data driving chip, a level shifter and a time sequence control chip, the grid driving circuit is arranged on an array substrate of the mini-LED liquid crystal display panel, the time sequence control chip is connected with the data driving chip, and the time sequence control chip is connected with the grid driving circuit through the level shifter; the grid driving circuit is connected with scanning lines in the mini-LED liquid crystal display panel, and the data driving chip is connected with data lines in the mini-LED liquid crystal display panel;
the display device also comprises a detection unit and a control unit, wherein the detection unit is used for detecting the temperature condition of the area where the gate driving circuit is located, and the control unit is connected with the gate driving circuit and used for controlling the current passing through the gate driving circuit; the control unit and the time sequence control chip are respectively connected with the detection unit, when the temperature condition of the area where the gate driving circuit is located is greater than or equal to the preset temperature condition, the control unit reduces the current passing through the gate driving circuit, and the time sequence control chip reduces the light-emitting brightness of the mini-LED corresponding to the area where the gate driving circuit is located.
Optionally, the detecting unit includes a thermistor, the control unit includes a logic counter, a selection switch, a first line and a second line, a first input end of the logic counter receives a power supply voltage through a power supply signal line, a second input end of the logic counter is connected with the timing control chip through a level shifter, and the thermistor is connected with the power supply signal line; the output end of the logic counter is connected with one end of the selection switch, the other end of the selection switch is connected with the first circuit or the second circuit, and the logic counter is connected with the grid driving circuit through the first circuit or the second circuit; taking the area where the grid driving circuit is positioned in the mini-LED liquid crystal display panel as a circuit area, and when the temperature condition of the circuit area is smaller than the preset temperature condition, connecting the logic counter with the grid driving circuit through the first circuit; when the temperature condition of the circuit area is greater than or equal to the preset temperature condition, the logic counter is connected with the grid driving circuit through the second circuit; and the second circuit is provided with a current limiting resistor.
Optionally, the display device further includes a compensation module, one end of the compensation module is connected with the timing control chip, and the other end of the compensation module is connected between the current limiting resistor and the gate driving circuit; the compensation module records signal waveforms input by the grid driving circuit to the mini-LED liquid crystal display panel when the mini-LED liquid crystal display panel displays normally; the compensation module is used for detecting the signal waveform passing through the current limiting resistor and compensating the detected signal waveform to the recorded signal waveform.
The inventor researches that the mini-LED backlight has high power consumption, and the LED lamp generates larger heat and transfers the heat to the panel along with the increase of the display time length; the inventor also found that the GOA bus is fed to all TFT switches in the panel from the corners of the array substrate through COF (Chip On Film) side, and that all GOA wires at corners are thinner and more concentrated, which also causes heat generation; under the combination of two heating sources, namely a mini-LED and a GOA, the panel can generate larger heat at the corner position corresponding to the GOA, so that the deflection of liquid crystal is affected, and light leakage occurs under the dark state condition.
Based on this, the present application provides a display device and a driving method thereof for solving the problem, when detecting the corner of a mini-LED liquid crystal display panel, that is, when the temperature of the area where the gate driving circuit is located increases to a certain extent to affect the deflection of liquid crystal, the application reduces the temperature of the gate driving circuit by reducing the current passing through the gate driving circuit, and simultaneously reduces the light-emitting brightness of the mini-LED corresponding to the circuit area, so that the heat of the mini-LED is reduced, and the combination of the two reduces the temperature at the corner of the mini-LED liquid crystal display panel, so that the mini-LED liquid crystal display panel returns to normal, at this time, the mini-LED liquid crystal display panel returns to normal display, the deflection of liquid crystal molecules is not affected, and when displaying a dark picture, the corner of the mini-LED liquid crystal display panel will not have the problem of light leakage.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of a display device according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a display device according to an embodiment of the present application;
FIG. 3 is a schematic waveform diagram of a first clock signal and a latch signal;
FIG. 4 is a schematic waveform diagram of a second clock signal and a latch signal;
FIG. 5 is a schematic waveform diagram of a third clock signal and a latch signal;
fig. 6 is a flowchart of a driving method of a display device according to an embodiment of the present application;
fig. 7 is a flowchart of another driving method of a display device according to an embodiment of the present application;
fig. 8 is a flowchart illustrating specific steps provided in an embodiment of the present application.
10, a display device; 100. mini-LED liquid crystal display panel; 200. a gate driving circuit; 300. a data driving chip; 400. a timing control chip; 500. a detection unit; 600. a control unit; 610. a logic counter; 620. a selection switch; A. a first line; B. a second line; r, a current limiting resistor; 700. a compensation module; 800. a level shifter.
Detailed Description
It should be understood that the terminology, specific structural and functional details disclosed herein are merely representative for purposes of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
Furthermore, unless expressly specified and limited otherwise, "connected" and "coupled" are to be construed broadly, and may be either permanently connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
As shown in fig. 1, as a display device provided in the embodiment of the present application, the display device 10 includes a mini-LED liquid crystal display panel 100, a gate driving circuit 200, a data driving chip 300, a level shifter 800, and a timing control chip 400, where the mini-LED liquid crystal display panel 100 is a liquid crystal panel using a mini-LED backlight, and the gate driving circuit 200 is disposed on an array substrate of the mini-LED liquid crystal display panel 100, that is, the gate driving circuit 200 adopts a GOA circuit design. It should be noted that the mini-LED lamps are not only distributed in the display area of the mini-LED liquid crystal display panel 100, but also in the non-display area, and are located below the GOA circuit.
The timing control chip 400 is connected to the data driving chip 300, and the timing control chip 400 is connected to the gate driving circuit 200 through the level shifter 800; the gate driving circuit 200 is connected to the scanning lines in the mini-LED liquid crystal display panel 100, and the data driving chip 300 is connected to the data lines in the mini-LED liquid crystal display panel 100.
The display device 10 further includes a detection unit 500 and a control unit 600, wherein the detection unit 500 is disposed on the mini-LED liquid crystal display panel 100 and is configured to detect a temperature condition of an area where the gate driving circuit 200 is located; the detection unit 500 may be specifically formed on the array substrate of the mini-LED liquid crystal display panel 100 and is disposed in the same area as the GOA circuit, and the detection unit 500 also corresponds to the black matrix on the color film substrate, so as to avoid affecting the aperture ratio of the mini-LED liquid crystal display panel 100.
The control unit 600 is connected to the gate driving circuit 200, and is used for controlling the current passing through the gate driving circuit 200; the control unit 600 may be formed on the timing control chip 400 or on the array substrate; the control unit 600 is preferably arranged on the timing control chip 400, so as to avoid the heat generated during the operation of the control unit 600 and related circuits from affecting the mini-LED liquid crystal display panel 100.
The control unit 600 and the timing control chip 400 are respectively connected to the detection unit 500, when the temperature condition of the area where the gate driving circuit 200 is located is greater than or equal to the preset temperature condition, the control unit 600 reduces the current passing through the gate driving circuit 200, and the timing control chip 400 reduces the light emitting brightness of the mini-LED corresponding to the area where the gate driving circuit 200 is located.
The inventor researches that the mini-LED backlight has high power consumption, and the LED lamp generates larger heat and transfers the heat to the panel along with the increase of the display time length; the inventor also found that the GOA bus is fed to all TFT switches in the panel from the corners of the array substrate through COF (Chip On Film) side, and that all GOA wires at corners are thinner and more concentrated, which also causes heat generation; under the combination of two heating sources, namely a mini-LED and a GOA, the panel can generate larger heat at the corner position corresponding to the GOA, so that the deflection of liquid crystal is affected, and light leakage occurs under the dark state condition.
Although the problem of light leakage can be improved by reducing the power consumption of the mini-LED to generate heat or improving the GOA routing of the LCD, the cost is high due to the fact that the mini-LED power consumption to generate heat or the GOA routing of the LCD is improved, the load of the LCD is difficult to reduce, the GOA is difficult to improve, and the improvement effect cannot be expected.
Based on this, the application improves the driving circuit, when detecting the corner of the mini-LED liquid crystal display panel 100, that is, when the temperature of the area where the gate driving circuit 200 is located increases to a certain extent to affect the deflection of the liquid crystal, the application reduces the temperature of the gate driving circuit 200 by reducing the current passing through the gate driving circuit 200, and simultaneously reduces the light-emitting brightness of the mini-LED corresponding to the circuit area, so that the heat of the mini-LED is reduced, and the combination of the two reduces the temperature at the corner of the mini-LED liquid crystal display panel 100, so that the temperature at the corner of the mini-LED liquid crystal display panel 100 returns to normal, at this time, the mini-LED liquid crystal display panel 100 resumes normal display, the deflection of the liquid crystal molecules is not affected, and when displaying a dark picture, the corner of the mini-LED liquid crystal display panel 100 will not have the problem of light leakage.
Specifically, as shown in fig. 2, the detecting unit 500 may be a thermistor, specifically, a negative temperature coefficient thermistor, where the resistance value is lower as the temperature is higher. The control unit 600 includes a logic counter 610, a selection switch 620, a first line a and a second line B, wherein a first input terminal of the logic counter 610 receives a power supply Voltage (VDD) through a power supply signal line, a second input terminal of the logic counter 610 is connected to the timing control chip 400 through a level shifter, and the thermistor is connected to the power supply signal line. The output end of the logic counter 610 is connected to one end of the selection switch 620, the other end of the selection switch 620 is connected to the first line a or the second line B, and the logic counter 610 is connected to the gate driving circuit 200 through the first line a or the second line B.
Taking the area of the mini-LED liquid crystal display panel 100 where the gate driving circuit 200 is located as a circuit area, and when the temperature condition of the circuit area is smaller than the preset temperature condition, the logic counter 610 is connected with the gate driving circuit 200 through the first line A; when the temperature condition of the circuit area is greater than or equal to the preset temperature condition, the logic counter 610 is connected to the gate driving circuit 200 through the second line B; and the second circuit B is provided with a current limiting resistor R.
The preset temperature condition includes a temperature and a duration of the temperature, the temperature of the circuit area is detected by the thermistor, the duration of the temperature is detected by the logic counter 610, and when the temperature and the duration exceed the preset conditions, the second circuit B connected with the current limiting resistor R is selected, so that the resistance in the circuit is increased, and then the current is decreased, so that the current received by the gate driving circuit 200 is decreased. If the temperature reaches the preset condition, but the duration of the temperature is ignored, the temperature may be raised due to the fact that the mini-LED liquid crystal display panel 100 suddenly displays a brighter picture, or abnormal conditions such as transient current occur, but the display effect of the mini-LED liquid crystal display panel 100 is not affected, so that the driving of GOA and mini-LED is not required to be adjusted, and the stability of the overall display effect of the mini-LED liquid crystal display panel 100 is not affected.
Further, the display device 10 further includes a compensation module 700, one end of the compensation module 700 is connected to the timing control chip 400, and the other end of the compensation module 700 is connected between the current limiting resistor R and the gate driving circuit 200; the compensation module 700 records the signal waveform input by the gate driving circuit 200 to the mini-LED liquid crystal display panel 100 when the mini-LED liquid crystal display panel 100 displays normally; the compensation module 700 is configured to detect a signal waveform passing through the current limiting resistor R and to compensate the detected signal waveform to a recorded signal waveform.
Or, the compensation module 700 records the charging time when the mini-LED lcd panel 100 displays normally, and when detecting that the charging time is shortened, directly compensates the charging time or directly replaces the recorded charging time with the detected abnormal charging time.
After the current limiting resistor R is added, the resistance of the GOA circuit trace on the array substrate is increased, so that delay occurs between rising (rising) and falling (falling) of the GOA high-speed signal, and the actual charging time of the panel is shortened. As shown in fig. 3, waveforms of the corresponding clock signal (CLK) and latch signal (TP) are schematically shown when the GOA circuit is driven by the first line a, wherein the actual charging time of the mini-LED liquid crystal display panel 100 is denoted by T1. As shown in fig. 4, when the GOA circuit is driven by the second line B and the compensation module 700 is not added, the waveforms of the corresponding clock signal and the latch signal are schematically shown, wherein the actual charging time of the mini-LED liquid crystal display panel 100 is denoted by T2, and it can be seen that the delay occurs due to the rising and falling of the clock signal, resulting in T2 being significantly shorter than T1. As shown in fig. 5, when the GOA circuit is driven by the second line B and the compensation module 700 is added, waveforms of the corresponding clock signal and latch signal are schematically shown, wherein the actual charging time of the mini-LED lcd panel 100 is denoted by T3; because the compensation module 700 compensates the charging time, even if the rising and falling of the clock signal are delayed due to the existence of the current limiting resistor R, T3 can be equal to T1, so that the charging time remains unchanged originally, and the dark state corner light leakage problem is effectively improved while the taste of the display picture is not affected.
As a specific example, referring to fig. 2, when the thermistor detects that the GOA area temperature increases, the resistance decreases, and the VDD voltage increases, and then the logic counter 610 determines that the voltage is set to be 4V (45 ℃ corresponding to the GOA area temperature detected by the thermistor), and if the voltage is maintained for more than 4V after the time of 1s after the start of 4V is reached, the logic counter 610 module selects the GOA signal of the second line B with the current-limiting resistor R; because the current limiting resistor R is added, the charging time of the mini-LED lcd panel 100 is changed from fig. 3 to fig. 4, the decrease of CLK is slow, the actual charging time (T2) is decreased, and the image quality is affected. Similarly, if the logic counter 610 does not reach the set voltage (4V) and the duration is 1s, the first line a is selected, the timing control chip 400 cannot detect the signal of the second line B, and the charging time remains unchanged as T1.
Correspondingly, as shown in fig. 6, the embodiment of the present application further discloses a driving method of a display device, which is used for driving the display device 10, and the driving method of the display device includes the steps of:
s1: taking the area where a grid driving circuit is positioned in a mini-LED liquid crystal display panel as a circuit area, and detecting the temperature condition of the circuit area;
s2: judging the magnitude relation between the temperature condition of the circuit area and a preset temperature condition;
a: when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, the mini-LED liquid crystal display panel displays normally;
s3: reducing current through the gate drive circuit;
s4: and reducing the light-emitting brightness of the mini-LED corresponding to the circuit area.
Specifically, in step S1, the temperature condition may be just the temperature, or may include both the temperature and the duration of the temperature.
By the method, the problem of corner light leakage in dark state of the mini-LED liquid crystal display panel can be solved.
When the temperature condition includes both the temperature magnitude and the duration, in step S1, the temperature magnitude of the circuit area and the duration of the temperature are detected by a thermistor and a logic counter, resulting in a first temperature and a first time. In step S2, a magnitude relation between the first temperature and a first preset temperature, and a magnitude relation between the first time and a first preset time are determined. In the step A, when the first temperature is greater than or equal to the first preset temperature and the first time is greater than or equal to the first preset time, performing the subsequent steps; and when the first temperature is smaller than the first preset temperature and/or the first time is smaller than the first preset time, the mini-LED liquid crystal display panel displays normally. The first preset temperature may be 45 degrees, and the first preset time may be 1 second, and the inventor tests to find that the deflection of the liquid crystal is gradually affected under the condition.
When the first temperature is smaller than the first preset temperature and the first time is smaller than the first preset time, the grid driving circuit is connected through a first circuit; when the first temperature is greater than or equal to the first preset temperature and/or the first time is greater than or equal to the first preset time, the gate driving circuit is connected through a second circuit; the resistance value of the second circuit is larger than that of the first circuit.
According to the method, different circuits are switched through temperature conditions to adjust the current of the GOA circuit, the circuit structure in the original GOA circuit is not required to be changed, the GOA circuit can be realized by adding a small number of structures to the wiring outside the GOA circuit, and the obvious effect can be achieved without consuming excessive cost to input design.
Further, as shown in fig. 7, after step S3, the method further includes the steps of:
s5: compensating the charging time of the mini-LED liquid crystal display panel to enable the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time;
and the first charging time is the charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the temperature condition of the circuit area is smaller than the preset temperature condition and the mini-LED liquid crystal display panel displays normally.
According to the embodiment of the application, the charging time of the mini-LED liquid crystal display panel is compensated by additionally arranging the compensation module in the driving circuit, so that the problem of light leakage at dark corners is effectively improved while the taste of a display picture is not influenced. In addition, the logic counter and the compensation module can be arranged in the time sequence control chip, and the problem that the area occupied by the circuit of the non-display area of the array substrate is enlarged and the frame is enlarged is avoided.
As a specific example, as shown in fig. 8, step S5 includes:
s51: recording a first charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the mini-LED liquid crystal display panel displays normally;
s52: detecting the second charging time of the grid driving circuit to the mini-LED liquid crystal display panel after the current passing through the grid driving circuit is reduced;
s53: comparing the second charging time with the first charging time;
s54: when the second charging time is smaller than the first charging time, compensating the difference value between the first charging time and the second charging time into the mini-LED liquid crystal display panel, and enabling the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time.
In step S4, when the temperature condition of the circuit area is greater than or equal to the preset temperature condition, the light-emitting brightness of the mini-LED corresponding to the circuit area is reduced by reducing the duty ratio when the mini-LED corresponding to the circuit area is dimmed by Pulse Width Modulation (PWM), so as to reduce the temperature of the mini-LED.
In the embodiment of the application, the circuit for controlling the GOA and the circuit for controlling the mini-LED can work independently, and at the moment, each control circuit is provided with an independent thermistor for detection, wherein the thermistor is arranged on the array substrate, and the thermistor is arranged on the backlight module; therefore, when one control circuit is abnormal, the other control circuit can work, so that the problem of light leakage of the dark state corner of the mini-LED liquid crystal display panel can be relieved to a certain extent, and serious light leakage of the dark state corner of the mini-LED liquid crystal display panel caused by simultaneous failure is avoided; moreover, this may make the detection more targeted.
The circuit for controlling the GOA and the circuit for controlling the mini-LED can share one thermistor, so that when the conditions are met, the two control circuits work simultaneously, the effect of cooling corners is achieved very quickly, and the problem of delay caused by asynchronous work is avoided.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, or may be executed after, or may even be executed simultaneously, and the solutions of different embodiments may be combined and applied under the condition of not conflicting, so long as the present solution can be implemented, all should be considered as falling within the protection scope of the present application.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.

Claims (10)

1. The driving method of the display device comprises a mini-LED liquid crystal display panel and a grid driving circuit, wherein the grid driving circuit is arranged on an array substrate of the mini-LED liquid crystal display panel, and the driving method of the display device is characterized by comprising the following steps:
taking the area where a grid driving circuit is positioned in a mini-LED liquid crystal display panel as a circuit area, and detecting the temperature condition of the circuit area;
judging the magnitude relation between the temperature condition of the circuit area and a preset temperature condition;
when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, the mini-LED liquid crystal display panel displays normally;
reducing current through the gate drive circuit; and
and reducing the light-emitting brightness of the mini-LED corresponding to the circuit area.
2. The method according to claim 1, wherein in the step of detecting a temperature condition of a circuit area in which a gate driving circuit is located in the mini-LED liquid crystal display panel, the temperature of the circuit area and a time duration of the temperature are detected to obtain a first temperature and a first time;
in the step of judging the magnitude relation between the temperature condition of the circuit area and the preset temperature condition, judging the magnitude relation between the first temperature and the first preset temperature and the magnitude relation between the first time and the first preset time;
when the temperature condition of the circuit area is more than or equal to the preset temperature condition, carrying out the subsequent steps; when the temperature condition of the circuit area is smaller than the preset temperature condition, in the step of normally displaying the mini-LED liquid crystal display panel, when the first temperature is larger than or equal to the first preset temperature and the first time is larger than or equal to the first preset time, carrying out the subsequent steps; and when the first temperature is smaller than the first preset temperature and/or the first time is smaller than the first preset time, the mini-LED liquid crystal display panel displays normally.
3. The driving method of a display device according to claim 2, wherein the gate driving circuit is connected through a first line when the first temperature is less than the first preset temperature while the first time is less than the first preset time; when the first temperature is greater than or equal to the first preset temperature and/or the first time is greater than or equal to the first preset time, the gate driving circuit is connected through a second circuit;
the resistance value of the second circuit is larger than that of the first circuit.
4. The driving method of the display device according to claim 3, further comprising, after the step of reducing the current passing through the gate driving circuit, the step of:
compensating the charging time of the mini-LED liquid crystal display panel to enable the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time;
and the first charging time is the charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the temperature condition of the circuit area is smaller than the preset temperature condition and the mini-LED liquid crystal display panel displays normally.
5. The method of driving a display device according to claim 4, wherein in the step of compensating for the charge time of the mini-LED liquid crystal display panel to restore the charge time of the mini-LED liquid crystal display panel to the first charge time, comprising:
recording a first charging time of the grid driving circuit to the mini-LED liquid crystal display panel when the mini-LED liquid crystal display panel displays normally;
detecting the second charging time of the grid driving circuit to the mini-LED liquid crystal display panel after the current passing through the grid driving circuit is reduced;
comparing the second charging time with the first charging time; and
when the second charging time is smaller than the first charging time, compensating the difference value between the first charging time and the second charging time into the mini-LED liquid crystal display panel, and enabling the charging time of the mini-LED liquid crystal display panel to be recovered to the first charging time.
6. The driving method of a display device according to claim 2, wherein the first preset temperature is 45 degrees and the first preset time is 1 second.
7. The method of driving a display device according to claim 1, wherein the display device uses pulse width modulation to adjust light, and wherein in the step of reducing the light emission luminance of the mini-LEDs corresponding to the circuit regions, the light emission luminance of the mini-LEDs corresponding to the circuit regions is reduced by reducing a duty ratio at which the light emission luminance of the mini-LEDs corresponding to the circuit regions is adjusted by pulse width modulation.
8. A display device driven by the driving method of the display device according to any one of claims 1 to 7, wherein the display device comprises a mini-LED liquid crystal display panel, a gate driving circuit, a data driving chip, a level shifter and a timing control chip, the gate driving circuit is arranged on an array substrate of the mini-LED liquid crystal display panel, the timing control chip is connected with the data driving chip, and the timing control chip is connected with the gate driving circuit through the level shifter; the grid driving circuit is connected with scanning lines in the mini-LED liquid crystal display panel, and the data driving chip is connected with data lines in the mini-LED liquid crystal display panel;
the display device also comprises a detection unit and a control unit, wherein the detection unit is used for detecting the temperature condition of the area where the gate driving circuit is located, and the control unit is connected with the gate driving circuit and used for controlling the current passing through the gate driving circuit;
the control unit and the time sequence control chip are respectively connected with the detection unit, when the temperature condition of the area where the gate driving circuit is located is greater than or equal to the preset temperature condition, the control unit reduces the current passing through the gate driving circuit, and the time sequence control chip reduces the light-emitting brightness of the mini-LED corresponding to the area where the gate driving circuit is located.
9. The display device according to claim 8, wherein the detecting unit includes a thermistor, the control unit includes a logic counter, a selection switch, a first line and a second line, a first input terminal of the logic counter receives a power supply voltage through a power supply signal line, a second input terminal of the logic counter is connected to the timing control chip through a level shifter, and the thermistor is connected to the power supply signal line;
the output end of the logic counter is connected with one end of the selection switch, the other end of the selection switch is connected with the first circuit or the second circuit, and the logic counter is connected with the grid driving circuit through the first circuit or the second circuit;
taking the area where the grid driving circuit is positioned in the mini-LED liquid crystal display panel as a circuit area, and when the temperature condition of the circuit area is smaller than the preset temperature condition, connecting the logic counter with the grid driving circuit through the first circuit; when the temperature condition of the circuit area is greater than or equal to the preset temperature condition, the logic counter is connected with the grid driving circuit through the second circuit;
and the second circuit is provided with a current limiting resistor.
10. The display device according to claim 9, further comprising a compensation module, wherein one end of the compensation module is connected to the timing control chip, and the other end of the compensation module is connected between the current limiting resistor and the gate driving circuit;
the compensation module records signal waveforms input by the grid driving circuit to the mini-LED liquid crystal display panel when the mini-LED liquid crystal display panel displays normally; the compensation module is used for detecting the signal waveform passing through the current limiting resistor and compensating the detected signal waveform to the recorded signal waveform.
CN202310467791.8A 2023-04-19 2023-04-19 Display device and driving method thereof Pending CN116486756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310467791.8A CN116486756A (en) 2023-04-19 2023-04-19 Display device and driving method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310467791.8A CN116486756A (en) 2023-04-19 2023-04-19 Display device and driving method thereof

Publications (1)

Publication Number Publication Date
CN116486756A true CN116486756A (en) 2023-07-25

Family

ID=87217528

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310467791.8A Pending CN116486756A (en) 2023-04-19 2023-04-19 Display device and driving method thereof

Country Status (1)

Country Link
CN (1) CN116486756A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106782363A (en) * 2016-12-07 2017-05-31 惠州三华工业有限公司 Dimmer display
CN108847195A (en) * 2018-06-29 2018-11-20 深圳市华星光电半导体显示技术有限公司 The circuit and method and liquid crystal display of reduction array substrate row driving current
CN110689838A (en) * 2019-10-31 2020-01-14 京东方科技集团股份有限公司 Display panel and display device
CN111223449A (en) * 2020-03-23 2020-06-02 合肥京东方显示技术有限公司 Display panel, driving method thereof and display device
CN115061306A (en) * 2022-07-07 2022-09-16 京东方科技集团股份有限公司 Display panel and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106782363A (en) * 2016-12-07 2017-05-31 惠州三华工业有限公司 Dimmer display
CN108847195A (en) * 2018-06-29 2018-11-20 深圳市华星光电半导体显示技术有限公司 The circuit and method and liquid crystal display of reduction array substrate row driving current
CN110689838A (en) * 2019-10-31 2020-01-14 京东方科技集团股份有限公司 Display panel and display device
CN111223449A (en) * 2020-03-23 2020-06-02 合肥京东方显示技术有限公司 Display panel, driving method thereof and display device
CN115061306A (en) * 2022-07-07 2022-09-16 京东方科技集团股份有限公司 Display panel and display device

Similar Documents

Publication Publication Date Title
US9076357B2 (en) Redundant operation of a backlight unit of a display device under a shorted LED condition
US8363004B2 (en) Method of driving a light source, light source device for performing the same, and display device having the light source device
US9271379B2 (en) Redundant operation of a backlight unit of a display device under open circuit or short circuit LED string conditions
US8084959B2 (en) Light emitting diode backlight module and driving apparatus and method thereof
KR101710154B1 (en) Power circuit for liquid crystal display device and liquid crystal display device including the same
JP2009282187A (en) Liquid crystal driving device
JP2003140626A (en) Picture display device
KR20070043682A (en) Liquid crystal display device and driving method of the same
US11289038B2 (en) Pixel charging method for adjusting sub-pixel charging time, pixel charging circuit, display device and display control method
US10705377B2 (en) Liquid crystal display device and method of controlling the same
CN111402802B (en) Pixel circuit and display panel
US8305332B2 (en) Backlight unit, liquid crystal display device including the same, and localized dimming method thereof
US8537150B2 (en) Method and control board for eliminating power-off residual images in display and display using the same
KR20080079862A (en) Lcd including temperature compensation circuit and driving method of the same
JP4640951B2 (en) Liquid crystal display device
US8749937B2 (en) Display device
CN110379373B (en) Backlight driving circuit, control method thereof and liquid crystal display device
CN116486756A (en) Display device and driving method thereof
WO2024016591A1 (en) Backlight driving circuit, backlight module, and display device
JP5247172B2 (en) LIGHTING DEVICE AND DISPLAY DEVICE HAVING THE SAME
CN114242014B (en) COF temperature control circuit, driving method and terminal equipment
US11823608B2 (en) Display device and driving method thereof
KR20120112950A (en) Backlight unit and liquid crystal display device using the same
TW202347289A (en) Scan driving circuit and method of controlling the same
KR20060001285A (en) Curcuit for driving liquid crystal display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination