Driving method of display device and display device

By detecting ambient temperature and adjusting the on-state voltage and clock signal duty cycle to generate a gate drive signal, the problem of poor image quality in display devices at low or high temperatures is solved, and the image quality and reliability of display devices at different temperatures are improved.

CN117198239BActive Publication Date: 2025-12-05CHANGSHA HKC OPTOELECTRONICS CO LTD +1
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Patent Information

Application Number
CN202311117320.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-31
Publication Date
2025-12-05
Estimated Expiration
2043-08-31

AI Technical Summary

Technical Problem

The image quality of existing display devices is affected by low or high temperatures, especially when the conduction voltage is too high under high frequency drive, resulting in severe ghosting.

Method used

By detecting the ambient temperature, the duty cycle of the conduction voltage and clock signal is adjusted according to the temperature to generate a gate drive signal to drive the pixels of the display panel. Temperature compensation circuit and ambient temperature detection circuit are used to adjust the ratio of voltage and clock signal to optimize the display effect.

Benefits of technology

It improves the image quality of the display device at low or high temperatures, especially by adjusting the display effect of the display device at low or high temperatures, thus avoiding instability and reliability of the image quality of the display device at low or high temperatures.

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Abstract

The application discloses a display device driving method and display device, the driving method comprises the steps that the ambient temperature is detected; according to the ambient temperature, the on voltage is obtained according to the first preset condition; according to the ambient temperature and the obtained on voltage, the duty cycle of the clock signal is obtained according to the second preset condition; the gate drive signal is generated according to the on voltage and the duty cycle of the clock signal to drive the corresponding pixel of the display panel, wherein the on voltage is the opening voltage of the driving switch of the pixel of the display panel. By detecting the ambient temperature, adjusting the on voltage value according to the ambient temperature, and further adjusting the duty cycle of the clock signal according to the on voltage value, the leakage of the driving switch in the display panel is improved, and the quality deterioration problems such as ghosting, residual image and the like caused by the prolonged opening time of the driving switch due to the increased on voltage are avoided.
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Description

TECHNICAL FIELD

[0001] The present application relates to the display technical field, and particularly relates to a driving method of a display device and the display device. BACKGROUND

[0002] With the continuous development of display technology, mainstream displays on the market currently include liquid crystal displays (LCD) and OLED displays, which have many advantages such as thin body, power saving, no radiation, and have been widely applied. For example, televisions, mobile phones, personal digital assistants (PDA), digital cameras, computer screens or notebook computer screens, and the like, which dominate the flat panel display field.

[0003] GDL technology (Gate Driver less) is a technology of using original array processes of a liquid crystal display panel to manufacture a driving circuit of a horizontal scanning line on a substrate around a display area, so that the driving circuit can replace an external integrated circuit board (IC) to complete the driving of the horizontal scanning line. The current of the TFT at low temperature is reduced, and generally, the on-voltage of the GDL needs to be increased to ensure the stability of the driving of the GDL circuit. However, in actual products, when the driving frequency is increased to 240 Hz, the voltage value of the on-voltage at low temperature is above 30 V, and a trailing phenomenon occurs, which seriously affects the quality of the products. SUMMARY

[0004] The purpose of the present application is to provide a driving method of a display device and the display device, and to improve the picture quality of the display device at low temperature or high temperature.

[0005] The present application discloses a driving method of a display device, which comprises the following steps:

[0006] detecting an ambient temperature;

[0007] obtaining an on-voltage according to a first preset condition according to the ambient temperature;

[0008] obtaining a duty cycle of a clock signal according to a second preset condition according to the ambient temperature and the obtained on-voltage; and

[0009] generating a gate driving signal to drive a corresponding pixel of a display panel according to the on-voltage and the duty cycle of the clock signal;

[0010] The on-voltage is an opening voltage of a driving switch of a pixel of the display panel.

[0011] Optionally, the step of detecting the ambient temperature comprises:

[0012] Detecting the ambient temperature in a driving time of a previous row of pixels of a current row of pixels;

[0013] The step of generating the gate driving signal according to the turn-on voltage and the duty cycle of the clock signal to drive the corresponding pixels of the display panel comprises:

[0014] The step of generating the gate driving signal according to the turn-on voltage and the duty cycle of the clock signal to drive the corresponding pixels of the display panel comprises:

[0015] Optionally, in the step of obtaining the turn-on voltage according to the ambient temperature and the first preset condition, the first preset condition is specifically that:

[0016] When the ambient temperature is less than the preset temperature value, the smaller the ambient temperature, the greater the turn-on voltage value, and the turn-on voltage value is obtained through a first formula;

[0017] When the ambient temperature is greater than or equal to the preset temperature value, the turn-on voltage value remains unchanged at a standard high-level voltage value;

[0018] The first formula is:

[0019] y=-0.12x+33; y is the turn-on voltage value, x is the ambient temperature, and the value range of x is [-20℃, 25℃];

[0020] The value range of the standard high-level voltage value is [30V, 31V].

[0021] Optionally, in the step of obtaining the duty cycle of the clock signal according to the ambient temperature and the obtained turn-on voltage and a second preset condition, the second preset condition is specifically that:

[0022] When the ambient temperature is less than the preset temperature value, the smaller the ambient temperature, the greater the duty cycle, and the duty cycle is obtained through a second formula;

[0023] When the ambient temperature is greater than or equal to the preset temperature value, the greater the ambient temperature, the smaller the duty cycle, and the duty cycle is obtained through a third formula;

[0024] The second formula is:

[0025] y=0.015x+0.385; y is the duty cycle, x is the ambient temperature, and the value range of x is [-20℃, 25℃];

[0026] The third formula is:

[0027] y=-0.015x+0.475; y is the duty cycle, x is the ambient temperature, and the value range of x is [25℃, 60℃].

[0028] Optionally, when the duty cycle of the gate drive signal is greater than that of the original gate drive signal, the falling edge of the gate drive signal is later than that of the original gate drive signal; when the duty cycle of the gate drive signal is less than that of the original gate drive signal, the falling edge of the gate drive signal is earlier than that of the original gate drive signal.

[0029] Optionally, the step of detecting the ambient temperature comprises:

[0030] detecting the ambient temperature between the rising edge of the frame start signal of the current frame and the falling edge of the frame start signal of the previous frame;

[0031] The step of generating the gate drive signal according to the turn-on voltage and the duty cycle of the clock signal to drive the corresponding pixels of the display panel comprises:

[0032] generating the gate drive signal of each row of pixels of the current frame according to the turn-on voltage and the duty cycle of the clock signal to drive each row of pixels of the display panel.

[0033] Optionally, the display device comprises a timing module and a temperature sensor, the timing module records the display time of the display device, and the temperature sensor is used to detect the ambient temperature, and the step of detecting the ambient temperature comprises the steps of:

[0034] when the display time of the display device exceeds a preset time, the temperature sensor is started to detect the ambient temperature, and if the preset time is not exceeded, the temperature sensor is not started to detect the ambient temperature.

[0035] The application also discloses a display device driven by the driving method, which is characterized in that the display device comprises a display panel and a driving circuit, the driving circuit is used to drive the display panel, the driving circuit comprises a temperature compensation circuit and an ambient temperature detection circuit, the temperature compensation circuit is connected with the ambient temperature detection circuit, the ambient temperature detection circuit is used to detect the ambient temperature, and the temperature compensation circuit obtains a turn-on voltage value and a duty cycle of a clock signal according to the ambient temperature detected by the ambient temperature detection circuit to generate a gate drive signal to drive the pixels in the display panel.

[0036] Optionally, the driving circuit comprises a timing control module and a gate drive circuit, the temperature compensation circuit and the ambient temperature detection circuit are arranged in the timing control module, the temperature circuit generates a new turn-on voltage and a clock signal and outputs them to the gate drive circuit, and the gate drive circuit generates a gate drive signal according to the new turn-on voltage and the clock signal and outputs the gate drive signal to the pixels of the display panel.

[0037] Optionally, the driving circuit comprises a timing control module and a gate driving circuit, the gate driving circuit comprises a plurality of gate driving units, each of the gate driving units is connected with a temperature compensation circuit and an ambient temperature detection circuit, the ambient temperature detection circuit detects the ambient temperature beside the gate driving unit, and the temperature compensation circuit changes an original turn-on voltage value and a duty cycle of a clock signal output by the timing control module according to the ambient temperature, so as to obtain a new turn-on voltage value and a duty cycle of the clock signal output to the gate driving unit, so as to generate a gate driving signal output to the pixel of the display panel.

[0038] Compared with the existing scheme of directly changing the turn-on voltage value, when the turn-on voltage is increased, the gate line of the display panel cannot decrease the turn-on voltage to the target voltage in a short time, and there is a high coupling capacitance in the process of changing the turn-on voltage, the voltage of the coupling capacitance is as high as above 0V, at this time, the driving switch cannot be normally closed, and leakage occurs. According to the temperature adjustment of the turn-on voltage value, according to the ambient temperature and the obtained turn-on voltage, the duty cycle of the clock signal is obtained according to the second preset condition, the gate driving signal is generated according to the turn-on voltage and the duty cycle of the clock signal to drive the corresponding pixel of the display panel. After the duty cycle is changed, the coupling capacitance disappears, and the increase of the turn-on voltage on the Gate delay can be obviously improved by adjusting the duty cycle, the driving switch reliability of the pixel is increased, and the picture quality effect of the display device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings included to provide a further understanding of the embodiments of the present application, constitute a part of the specification and are used to illustrate the embodiments of the present application together with the text description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor. In the drawings:

[0040] Figure 1 is a flowchart of the driving method of the first embodiment of the present application;

[0041] Figure 2 is a function relationship diagram of the second embodiment of the present application;

[0042] Figure 3 is a flowchart of the driving method of the third embodiment of the present application;

[0043] Figure 4 is a flowchart of the driving method of the fourth embodiment of the present application;

[0044] Figure 5 is a structural diagram of the display device of the fifth embodiment of the present application;

[0045] Figure 6 is a structural schematic diagram of a display device of a sixth embodiment of the present application.

[0046] 100, a display device; 110, a display panel; 120, a driving circuit; 121, a temperature compensation circuit; 122, an ambient temperature detection circuit; 123, a timing control module; 124, a gate driving circuit; 125, a gate driving unit. DETAILED DESCRIPTION

[0047] It should be understood that the terms used herein, the specific structures and functional details disclosed, are only for the purpose of describing specific embodiments, and are representative, but the present application can be embodied in many alternative forms, and should not be interpreted as being limited to the embodiments set forth herein.

[0048] The present application will be described in detail below with reference to the accompanying drawings and alternative embodiments.

[0049] Embodiment 1

[0050] Reference Figure 1 As shown in FIG. 1, as a first embodiment of the present application, a driving method of a display device is disclosed, the driving method comprising the steps of:

[0051] S1: detecting an ambient temperature;

[0052] S2: obtaining an on-voltage according to the first preset condition according to the ambient temperature;

[0053] S3: obtaining a duty cycle of a clock signal according to the second preset condition according to the ambient temperature and the obtained on-voltage; and

[0054] S4: generating a gate driving signal to drive the corresponding pixels of the display panel according to the on-voltage and the duty cycle of the clock signal.

[0055] The embodiment detects the ambient temperature, and the ambient temperature is not an external ambient temperature, but an ambient temperature at a position where the ambient temperature is detected. If a temperature sensor is used to detect the ambient temperature, the ambient temperature is an ambient temperature at a position where the temperature sensor is placed. After the ambient temperature is obtained, the on voltage (Vgatehigh, VGH) can be obtained through the environment. However, if the VGH voltage is used to generate a gate drive signal to drive pixels in the display panel, the opening time of the driving switch corresponding to the pixel can be prolonged, and the problem of incorrect charging can occur. Therefore, the clock signal duty cycle is further obtained according to the VGH and the ambient temperature. The gate drive signal is changed by changing the VGH and the clock signal duty cycle, that is, a new gate drive signal is generated by the VGH and the clock signal duty cycle to drive the pixels in the display panel. The opening degree of the active switch is controlled, and the opening time of the active switch is adjusted, so that the problem of incorrect charging or insufficient charging of the pixel caused by the opening of the active switch due to the ambient temperature is avoided.

[0056] Embodiment 2

[0057] Reference Figure 2 As a second embodiment of the present application, the first embodiment is further refined. If the VGH voltage is simply increased, the Ion (charging current) of the TFT is increased, the low-temperature operation reliability of the GDL is increased, but the opening time of the active switch Gate is increased, which leads to incorrect charging in the plane and deterioration of the image quality. The Ioff (leakage current) is increased, the power consumption and the LC exacerbation risk are increased, especially at high temperature operation. However, when the VGH is increased, the clock signal duty cycle (CK duty) is decreased, which can reduce the increase of the Gate delay caused by the increase of the VGH voltage. At the same time, the leakage time of the TFT and the stress of the TFT can be reduced, and the VGH voltage can be compensated. The influence of high and low temperature operation on the image quality and reliability can be reasonably optimized. Specifically, in the step S2, the first preset condition is:

[0058] When the ambient temperature is less than the preset temperature value, the smaller the ambient temperature, the greater the on voltage value, and the on voltage value is obtained by the first formula;

[0059] When the ambient temperature is greater than or equal to the preset temperature value, the on voltage value remains unchanged at a standard high-level voltage value;

[0060] The first formula is:

[0061] y = -0.12x + 33; y is the on voltage value, and x is the ambient temperature. The value range of x is [-20℃, 25℃).

[0062] The standard high level voltage value is in the range of 【30V, 31V】, and the on voltage is unchanged at high temperature, 30℃-60℃; CK duty changes linearly from 48% to 41.5%.

[0063] Further, in the step S3, the second preset condition is specifically:

[0064] When the ambient temperature is less than the preset temperature value, the smaller the ambient temperature, the greater the duty cycle, and the duty cycle is obtained through the second formula;

[0065] When the ambient temperature is greater than or equal to the preset temperature value, the greater the ambient temperature, the smaller the duty cycle, and the duty cycle is obtained through the third formula;

[0066] The second formula is:

[0067] y=0.015x+0.385; y is the duty cycle, x is the ambient temperature, and the value range of x is

【-20℃, 25℃);

[0068] The third formula is:

[0069] y=-0.015x+0.475; y is the duty cycle, x is the ambient temperature, and the value range of x is 【25℃, 60℃】.

[0070] The application adopts two compensation methods of clock signal duty cycle adjustment and VGH voltage adjustment for complementation, the Ion of the driving switch TFT rises at high temperature, and the driving ability is good; but if the duty cycle (CK duty) is large, the output and reaction time of each potential of the gate drive circuit (GDL) is long (such as the Q point time is long), which affects the stability of the TFT and easily causes serious TFT deterioration; moreover, the high voltage time of the clock signal CK increases, the leakage time between CK and VGL increases, the GDL power consumption increases, which causes heating and the like, so the duty cycle needs to be reduced at high temperature; at low temperature, the low temperature here mainly refers to the temperature of-20-24℃, the VGH voltage linearly changes from 30V to 36V; CK duty changes linearly from 48% to 40%; low temperature compensation mainly improves the VGH voltage; improves the TFT Ion, and increases the driving ability of the TFT.

[0071] Additionally, it should be noted that when the duty cycle of the gate drive signal is greater than that of the original gate drive signal, the falling edge of the gate drive signal is later than the falling edge of the original gate drive signal. Conversely, when the duty cycle of the gate drive signal is less than that of the original gate drive signal, the falling edge of the gate drive signal is earlier than the falling edge of the original gate drive signal. Therefore, it is not necessary to change the cycle time of each row; the start time remains unchanged. Of course, if the VGH value is small, and the duty cycle of the gate drive signal is greater than that of the original gate drive signal, the rising edge of the gate drive signal can be earlier than the rising edge of the original gate drive signal, and the falling edge of the gate drive signal can be later than the falling edge of the original gate drive signal. Conversely, if the VGH value is large, and the duty cycle of the gate drive signal is less than that of the original gate drive signal, the rising edge of the gate drive signal can be later than the rising edge of the original gate drive signal, and the falling edge of the gate drive signal can be earlier than the falling edge of the original gate drive signal to avoid excessive pixel charging.

[0072] Example 3:

[0073] like Figure 3 As shown, as a third embodiment of this application, which is a further refinement of any of the above embodiments, step S1 includes:

[0074] S11: Detect ambient temperature during the driving time of the pixel in the row preceding the current row of pixels;

[0075] Step S4 includes:

[0076] S41: Generate the current row gate drive signal based on the on-voltage and clock signal duty cycle to drive the corresponding current row pixel of the display panel.

[0077] In this embodiment, the detection time is mainly limited. In step S1, the ambient temperature can be detected in real time or within the driving cycle of each row of pixels. Considering that when the display device is displaying, the corresponding circuit or module is working, and the temperature will change, the VGH value or clock signal duty cycle is changed only when the temperature change exceeds a certain value. Otherwise, if the temperature keeps changing, constantly changing the VGH value and clock signal duty cycle will not only involve a large amount of calculation but may also cause display abnormalities. Therefore, the detection time selection also needs to be determined according to the actual situation. Generally, the ambient temperature is detected when the current row is displayed. Based on the ambient temperature, the required VGH value and clock signal duty cycle value for the next row are obtained, thereby changing the gate drive signal of the next row to achieve voltage compensation at different temperatures.

[0078] Of course, in addition to detecting once in each line period, it can also detect once in each frame time, and detect the ambient temperature between the rising edge of the frame start signal of the current frame and the falling edge of the frame start signal of the last frame; correspondingly, according to the on-voltage and the clock signal duty cycle, the gate drive signal of each row of pixels in the current frame is generated to drive the corresponding each row of pixels of the display panel.

[0079] Embodiment 4:

[0080] As shown in Figure 4 , as the fourth embodiment of the present application, it is a further refinement and improvement of the first embodiment, which is different from the above-mentioned embodiments, the display device comprises a timing module and a temperature sensor, the timing module records the display time of the display device, and the temperature sensor is used to detect the ambient temperature, and the step of detecting the ambient temperature comprises the steps of:

[0081] S1': when the display time of the display device exceeds the preset time, the temperature sensor is started to detect the ambient temperature, and if the preset time is not exceeded, the temperature sensor is not started to detect the ambient temperature.

[0082] In this embodiment, considering that the display device is not only affected by the ambient temperature of the outside world, but more importantly, it is affected by the high temperature environment formed by the heat generated after the internal components work, so generally the detection mode is started only when the display device works, and the time of starting is not at the same time as the display device starts to display. Because before starting to work, if the ambient temperature of the outside world is suitable, it will not actually affect the internal environment temperature of the display device, and there is no need to change the VGH or clock signal duty cycle. After working for a period of time, the internal temperature rises due to the heat generated by the components, at which time the compensation mode needs to be started. Therefore, this embodiment will set a timing module to count time, and when the working time reaches the preset time, the detection mode is started to detect the ambient temperature, and then the temperature compensation is performed. In addition, it should be noted that at low temperature, because the influence of the ambient temperature of the outside world is large, it may cause the internal temperature of the display device to be low, at which time the display device is started, and the detection mode is started to detect the ambient temperature, and the temperature compensation mode is started.

[0083] Embodiment 5:

[0084] As shown in Figure 5As shown, as the fifth embodiment of the present application, a display device is disclosed, which is driven by using the driving method as claimed in any one of the embodiments, and comprises a display panel and a driving circuit for driving the display panel; the driving circuit comprises a temperature compensation circuit and an ambient temperature detection circuit, the temperature compensation circuit is connected with the ambient temperature detection circuit, the ambient temperature detection circuit is used for detecting ambient temperature, and the temperature compensation circuit obtains a conduction voltage value and a clock signal duty ratio according to the ambient temperature detected by the ambient temperature detection circuit, so as to generate a gate driving signal for driving pixels in the display panel.

[0085] The ambient temperature detection circuit comprises a temperature sensor, which mainly detects the temperature of the region where the temperature sensor is placed, that is, the ambient temperature here does not mean the ambient temperature of the outside world. When the ambient temperature is detected, the ambient temperature value is output to the temperature compensation circuit. The temperature compensation circuit generates corresponding VGH value and clock signal duty ratio according to the ambient temperature. The temperature compensation circuit can realize low-temperature compensation and high-temperature compensation. In a low-temperature environment, the temperature is generally only-20℃24℃, the VGH voltage is linearly from 30V→36V, the lower the temperature, the greater the VGH voltage; the clock signal duty ratio (CK duty) is linearly changed from 48%→40%, mainly to improve the VGH voltage; to improve the TFT Ion and increase the driving capability of the TFT. The increase of the VGH voltage can be obviously improved by the decrease of the CK duty; in a high-temperature environment, the Ion of the driving switch TFT rises, and the driving capability itself is relatively good. By reducing the CK duty, the larger CK duty leads to longer output and reaction time of each potential of the GDL (such as longer Q point time), which affects the stability of the TFT and easily causes serious deterioration of the TFT. The leakage time between CK and VGL increases, the power consumption of GDL increases, and problems such as heating are caused.

[0086] Generally, the driving circuit comprises a timing control module and a gate driving circuit, the temperature compensation circuit and the ambient temperature detection circuit are arranged in the timing control module, the temperature detection circuit detects the temperature in the timing control module, the temperature circuit generates a new conduction voltage and a clock signal and outputs them to the gate driving circuit, and the gate driving circuit generates a gate driving signal according to the new conduction voltage and the clock signal and outputs it to the pixels of the display panel. Of course, the temperature compensation circuit and the ambient temperature detection circuit can also be arranged in the gate driving circuit, so that the detected temperature is closer to the temperature corresponding to the voltage that needs to be compensated.

[0087] Embodiment 6:

[0088] Reference Figure 6As shown, as the sixth embodiment of the present application, the driving circuit includes a timing control module and a gate driving circuit, the gate driving circuit includes a plurality of gate driving units, each of which is connected with a temperature compensation circuit and an ambient temperature detection circuit, the ambient temperature detection circuit detects the ambient temperature beside the gate driving unit, and the temperature compensation circuit changes the original on voltage value and the clock signal duty cycle output by the timing control module according to the ambient temperature, so as to obtain a new on voltage value and a clock signal duty cycle output to the gate driving unit, so as to generate a gate driving signal output to the pixel of the display panel.

[0089] The present embodiment can adjust the VGH and clock signal duty cycle corresponding to the gate driving signal of each row of pixels to realize temperature compensation of each row of pixels. Of course, the opening of the detection mode of each row can be opened as needed, such as in the area corresponding to the constant bright pixel, because the voltage is relatively high, it may cause relatively large temperature change. The original gate driving signal of these constant bright pixel rows is changed, and a new gate driving signal is generated by adjusting the VGH and clock signal duty cycle to drive the corresponding constant bright pixel row. As for some constant dark or non-constant bright pixel rows, the temperature compensation mode can not be opened, so as to avoid too large calculation brightness and affect the efficiency of signal transmission.

[0090] It should be noted that the steps involved in the present scheme are not limited to the order of execution, for example, detecting the state of the driving method of the display device and detecting the display mode of the driving method of the display device can be detected simultaneously, or the state of the driving method of the display device can be detected first and then the display mode of the driving method of the display device can be detected, or the display mode of the driving method of the display device can be detected first and then the state of the driving method of the display device can be detected, that is, the steps written in the front can be executed first, or can be executed later, or can be executed simultaneously, as long as the present scheme can be implemented, it should be considered to belong to the protection scope of the present application.

[0091] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot be listed one by one, therefore, on the premise of not conflicting, the above described embodiments or technical features can be combined to form new embodiments, and the combination of each embodiment or technical feature will enhance the original technical effect.

[0092] The above is a further detailed description of the present application in combination with specific optional embodiments, which cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered to belong to the protection scope of the present application.

Claims

1. A driving method of a display device, characterized by, The method comprises the steps of: detecting an ambient temperature; obtaining a turn-on voltage according to the ambient temperature and a first preset condition; obtaining a duty cycle of a clock signal according to the ambient temperature and the obtained turn-on voltage and a second preset condition; and generating a gate drive signal according to the turn-on voltage and the duty cycle of the clock signal to drive pixels corresponding to the display panel. The turn-on voltage is an opening voltage of a driving switch of the pixels of the display panel. In the step of obtaining the duty cycle of the clock signal according to the ambient temperature and the obtained turn-on voltage and the second preset condition, the second preset condition is specifically as follows: when the ambient temperature is less than a preset temperature value, the smaller the ambient temperature, the greater the duty cycle, and the duty cycle is obtained through a second formula; when the ambient temperature is greater than or equal to the preset temperature value, the greater the ambient temperature, the smaller the duty cycle, and the duty cycle is obtained through a third formula. The second formula is y = 0.015x + 0.385, where y is the duty cycle and x is the ambient temperature, and the value range of x is [-20℃, 25℃]. The third formula is y = -0.015x + 0.475, where y is the duty cycle and x is the ambient temperature, and the value range of x is [25℃, 60℃]. The step of detecting the ambient temperature comprises the steps of: detecting the ambient temperature in a driving time of the pixels of a previous row of the current row of pixels; The step of generating the gate drive signal to drive the pixels corresponding to the display panel comprises the step of: generating a current row of gate drive signals to drive the current row of pixels corresponding to the display panel according to the turn-on voltage and the duty cycle of the clock signal. In the step of obtaining the turn-on voltage according to the ambient temperature and the first preset condition, the first preset condition is specifically as follows: when the ambient temperature is less than a preset temperature value, the smaller the ambient temperature, the greater the turn-on voltage value, and the turn-on voltage value is obtained through a first formula; when the ambient temperature is greater than or equal to the preset temperature value, the turn-on voltage value remains unchanged at a standard high-level voltage value.

2. The driving method of claim 1, wherein, The first formula is y = -0.12x + 33, where y is the turn-on voltage value and x is the ambient temperature, and the value range of x is [-20℃, 25℃]. The value range of the standard high-level voltage value is [30V, 31V]. When the duty cycle of the gate drive signal is greater than that of an original gate drive signal, the falling edge of the gate drive signal is later than that of the original gate drive signal; when the duty cycle of the gate drive signal is less than that of the original gate drive signal, the falling edge of the gate drive signal is earlier than that of the original gate drive signal. The step of detecting the ambient temperature comprises the steps of:

3. The driving method of claim 1, wherein detecting the ambient temperature between a rising edge of a frame start signal of a current frame and a falling edge of a frame start signal of a previous frame; The step of generating the gate drive signal to drive the pixels corresponding to the display panel comprises the step of: generating a gate drive signal for each row of pixels of the current frame to drive each row of pixels corresponding to the display panel according to the turn-on voltage and the duty cycle of the clock signal. ​ ​ ​ 4. The driving method of claim 1, wherein ​ 5. The driving method of claim 1, wherein ​ ​ ​ ​ 6. The driving method of claim 1, wherein The display device comprises a timing module and a temperature sensor, the timing module records the display time of the display device, and the temperature sensor is used for detecting the ambient temperature, and the step of detecting the ambient temperature comprises the steps of: When the display time of the display device exceeds the preset time, the temperature sensor detects the ambient temperature, and if the preset time is not exceeded, the temperature sensor does not detect the ambient temperature.

7. A display device driven using the driving method according to any one of claims 1 to 6, characterized by The display device comprises a display panel and a driving circuit, and the driving circuit is used for driving the display panel. The driving circuit comprises a temperature compensation circuit and an ambient temperature detection circuit, the temperature compensation circuit is connected with the ambient temperature detection circuit, the ambient temperature detection circuit is used for detecting the ambient temperature, and the temperature compensation circuit obtains the conduction voltage value and the clock signal duty cycle according to the ambient temperature detected by the ambient temperature detection circuit to generate a gate driving signal to drive the pixels in the display panel.

8. The display device of claim 7, wherein, The driving circuit comprises a timing control module and a gate driving circuit, the temperature compensation circuit and the ambient temperature detection circuit are arranged in the timing control module, the temperature compensation circuit generates a new conduction voltage and a clock signal and outputs them to the gate driving circuit, and the gate driving circuit generates a gate driving signal according to the new conduction voltage and the clock signal and outputs the gate driving signal to the pixels of the display panel.

9. The display device of claim 7, wherein, The driving circuit comprises a timing control module and a gate driving circuit, the gate driving circuit comprises a plurality of gate driving units, each gate driving unit is connected with a temperature compensation circuit and an ambient temperature detection circuit, the ambient temperature detection circuit detects the ambient temperature beside the gate driving unit, and the temperature compensation circuit changes the original conduction voltage value and the clock signal duty cycle output by the timing control module according to the ambient temperature to obtain a new conduction voltage value and a clock signal duty cycle and output them to the gate driving unit to generate a gate driving signal and output the gate driving signal to the pixels of the display panel.

Citation Information

Patent Citations

  • Driving method of display panel and display device

    CN112133240A