Driving method of display device, driving circuit and display device

Abstract

The application discloses a display device driving method, a driving circuit and a display device. The driving method comprises the following steps: inputting any adjacent N row pixel driving signals of a main display area to a virtual display area, so that the display picture of N rows of pixels corresponding to the virtual display area and the main display area is the same; detecting the brightness change of the virtual display area, and calculating the flicker degree; adjusting the original common voltage according to the flicker degree until the flicker degree is controlled in a preset range, stopping the adjustment of the common voltage, and replacing the original common voltage with the adjusted common voltage to drive the next frame of display picture; wherein N is a natural number greater than or equal to 2. The application copies the picture in the main display area to the virtual display area, calculates the flicker degree through the brightness change of the virtual area, and then adjusts the common voltage value, so as to avoid the poor common voltage caused by the capacitive coupling effect and affect the display effect.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a driving method, driving circuit and display device for a display device. Background Technology

[0002] TFT LCD displays utilize the electric field created by the voltage difference between the pixel electrodes and the common electrode to deflect the liquid crystal at different angles, achieving varying transmittance and thus displaying different grayscale levels. However, due to the DC blocking effect of the liquid crystal alignment film and the DC residual effect of mobile particles in the liquid crystal, we must drive the LCD panel with bipolar voltages. Since negative voltages are difficult to generate, we typically set VCOM (common electrode) to an intermediate voltage (e.g., 6V), the positive electrode to a voltage higher than VCOM (e.g., 7-10V), and the negative electrode to a voltage lower than VCOM (e.g., 2-5V). The difference between the positive / negative polarity and VCOM is the voltage applied across the liquid crystal.

[0003] Because bipolar drive is used, the symmetry of the VCOM voltage is particularly important. However, it is not feasible to set VCOM exactly in the middle of the positive and negative polarities. The main reason is the capacitive coupling effect. The most serious problem is the coupling of the TFT turn-on voltage Vgh and turn-off voltage Vgl to the data voltage, which causes the voltage of the liquid crystal capacitor to change. If the original VCOM is used, the screen will flicker. Summary of the Invention

[0004] The purpose of this application is to provide a driving method, driving circuit, and display device for a display device. By copying the image in the main display area to a virtual display area, the flicker level is calculated by measuring the brightness changes in the virtual area, and then the common voltage value is adjusted to avoid poor common voltage due to capacitive coupling effect, which would affect the display effect.

[0005] This application discloses a driving method for a display device. The display device includes a display area and a non-display area surrounding the display area. Scan lines, data lines, and a plurality of pixels arranged in multiple rows and columns and driven by the scan lines and data lines are correspondingly disposed within the display area. The display area includes a main display area and a virtual display area. The driving method includes the following steps:

[0006] Input driving signals for any N adjacent rows of pixels in the main display area to the virtual display area, so that the display images of the virtual display area are the same as those of the corresponding N rows of pixels in the main display area;

[0007] Detecting brightness changes in the virtual display area and calculating the flicker level; and

[0008] The original common voltage is adjusted according to the degree of flicker until the degree of flicker is controlled within the preset range, then the adjustment of the common voltage is stopped, and the adjusted common voltage replaces the original common voltage to drive the display of the next frame.

[0009] Where N is a natural number greater than or equal to 2.

[0010] Optionally, before the step of inputting the driving signals of any N adjacent rows of pixels in the main display area to the virtual display area, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area, the following steps are further included:

[0011] The current frame is selected as the preset frame to be displayed;

[0012] Among them, when the preset image is set to the same frame, all positive polarity pixels are fully bright at 127 gray levels and all negative polarity pixels are fully dark, or all positive polarity pixels are fully dark and all negative polarity pixels are fully bright at 127 gray levels.

[0013] Optionally, before the step of inputting driving signals for any N adjacent rows of pixels in the main display area to the virtual display area, so that the virtual display area displays the same image as the corresponding N rows of pixels in the main display area, the following steps are included:

[0014] If the timing control chip detects whether a common voltage adjustment signal is generated, and if a common voltage adjustment signal is detected, then the step of inputting the driving signals of any N adjacent rows of pixels in the main display area to the virtual display area is executed, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area. If no common voltage adjustment signal is detected, then the original common voltage is used to drive the display.

[0015] Optionally, the step of detecting whether the timing control chip generates a common voltage adjustment signal, and if a common voltage adjustment signal is detected, then executing the step of inputting driving signals for any N adjacent rows of pixels in the main display area to the virtual display area, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area; if no common voltage adjustment signal is detected, then the step of using the original common voltage to drive the display includes:

[0016] The timing control chip monitors the usage time of the display device. If the usage time exceeds a preset time, the timing control chip generates a common voltage adjustment signal; if the usage time does not exceed the preset time, no common voltage adjustment signal is generated.

[0017] Optionally, the display device further includes a common voltage adjustment signal triggering circuit. This circuit is controlled to be turned on by an external switch of the display device or by a remote control corresponding to the display device. The step of detecting whether the timing control chip generates a common voltage adjustment signal, and if such a signal is detected, then executing the step of inputting driving signals for any N adjacent rows of pixels in the main display area to the virtual display area, so that the virtual display area displays the same image as the corresponding N rows of pixels in the main display area; if no common voltage adjustment signal is detected, then using the original common voltage to drive the display includes:

[0018] When the common voltage signal trigger circuit is turned on, the timing control chip generates a common voltage adjustment signal; if the common voltage signal trigger circuit is not turned on, no common voltage adjustment signal is generated.

[0019] Optionally, the step of inputting driving signals for any N adjacent rows of pixels in the main display area to the virtual display area, so that the virtual display area displays the same image as the corresponding N rows of pixels in the main display area, includes:

[0020] The driving signals for the last two rows of pixels in the main display area are sent to the virtual display area, so that the display images of the last two rows of pixels in the virtual display area are the same as those in the main display area.

[0021] Optionally, a photodiode and a resistor connected in series with the photodiode are provided corresponding to the virtual display area. The step of detecting the brightness change of the virtual display area and calculating the flicker level includes:

[0022] The photodiode generates different voltage values ​​according to the brightness changes of the display area, and calculates the flicker level using a preset calculation formula;

[0023] The preset calculation formula is as follows: Vr is the voltage across the resistor.

[0024] This application also discloses a driving circuit for a display device, which drives the display device using any of the driving methods described above. The driving circuit includes a timing control chip and a brightness acquisition circuit. The timing control chip outputs a driving signal corresponding to the current display screen to the main display area and the virtual display area within the display area of ​​the display device. The brightness acquisition circuit is configured to connect the virtual display area to the timing control chip along the light-emitting surface of the display panel. The brightness acquisition circuit is used to acquire the brightness of the screen in the virtual display area and calculate the flicker level, feeding it back to the timing control chip. The timing control chip adjusts the original common voltage value according to the flicker level until the flicker level calculated by the brightness acquisition circuit is within a preset range, thereby stopping the adjustment of the common voltage and replacing the original common voltage with the adjusted common voltage to drive the next frame of the display screen.

[0025] Optionally, the brightness acquisition circuit includes a photodiode, which is formed by a photodiode film disposed on the sub-pixel of the virtual display area. One end of the photodiode is connected to the power supply voltage, and the other end is grounded through a resistor. The two ends of the resistor are respectively connected to the timing control chip.

[0026] This application also discloses a display device, which includes any of the driving circuits described above and a display panel. The driving circuit is used to adjust the common voltage in the display panel to drive the display panel to display.

[0027] Compared to solutions that adjust the common voltage on the common electrode line, this application divides the display area into a main display area and a virtual display area. The image of several rows of pixels in the main display area is copied to the virtual display area for display. The brightness changes in the virtual display area are detected, and a corresponding voltage is generated based on the brightness changes to calculate the flicker level. The common voltage is then adjusted based on the flicker level. When the flicker level is controlled within a preset range, the adjustment of the common voltage is stopped, and the adjusted common voltage replaces the original common voltage to drive the next frame of the display image. This solves the problem that the coupling effect caused by parasitic capacitance causes the liquid crystal capacitor of the pixel to lose charge, resulting in a flickering image when using the original common voltage. Attached Figure Description

[0028] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0029] Figure 1 This is a schematic flowchart of a driving method for a display device according to the first embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the display device according to the first embodiment of this application;

[0031] Figure 3 This is a cross-sectional schematic diagram of the virtual display area according to the first embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the brightness acquisition circuit according to the first embodiment of this application;

[0033] Figure 5 This is a schematic flowchart of the driving method according to the second embodiment of this application;

[0034] Figure 6 This is a schematic flowchart of the driving method according to the third embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the drive circuit according to the fourth embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the drive circuit according to the fifth embodiment of this application;

[0037] Figure 9 This is a schematic diagram of the brightness acquisition circuit according to the sixth embodiment of this application;

[0038] Figure 10 This is a schematic diagram of the structure of the display device according to the seventh embodiment of this application.

[0039] Among them, 100 is the display device; 110 is the display area; 111 is the main display area; 112 is the virtual display area; 120 is the non-display area; 130 is the scan line; 140 is the data line; 150 is the sub-pixel; 160 is the common line; 170 is the photodiode thin film; 180 is the light-shielding layer; 200 is the driving circuit; 210 is the control board; 211 is the timing control chip; 212 is the gamma chip; 213 is the timer; 214 is the common voltage adjustment signal trigger circuit; 220 is the brightness acquisition circuit; 300 is the display panel; D1 is the photodiode; R1 is the first resistor; R2 is the second resistor; R3 is the third resistor; C1 is the first capacitor; C2 is the second capacitor; and U1 is the operational amplifier. Detailed Implementation

[0040] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0041] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0042] In addition, terms such as “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” that indicate orientation or positional relationship are based on the orientation or relative positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0045] refer to Figures 1 to 3 As shown, as a first embodiment of this application, a driving method for a display device is disclosed. The display device 100 includes a display area 110 and a non-display area 120 surrounding the display area 110. Scan lines 130, data lines 140, and a plurality of pixels 150 arranged in multiple rows and columns and driven by the scan lines 130 and the data lines 140 are correspondingly disposed within the display area 110. The display area 110 includes a main display area 111 and a virtual display area 112. The driving method includes the following steps:

[0046] S1: Input the driving signals of any N adjacent rows of pixels in the main display area to the virtual display area, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area;

[0047] S2: Detects changes in the brightness of the virtual display area and calculates the degree of flicker; and

[0048] S3: Adjust the original common voltage according to the flicker level until the flicker level is controlled within the preset range, then stop adjusting the common voltage and replace the original common voltage with the adjusted common voltage to drive the next frame display.

[0049] Where N is a natural number greater than or equal to 2, the number of rows of pixels 150 in the virtual display area 112 can be determined according to the size of the display panel 300. Generally, the minimum number of rows set in the virtual display area 112 is 2 rows, and the maximum number can be the same as the number of rows of pixels in the display panel 300. However, considering the display effect of the entire display area 110, the number of rows of pixels in the virtual display area 112 is generally less than one-tenth of the number of rows of pixels in the main display area, because the pixels in the virtual display area 112 are also connected to the scan lines 130 and the data lines 140, so as to avoid setting too many rows and causing too many scan lines 130.

[0050] In this embodiment, several rows of pixels are added to the original display area 110 to form a dummy area, namely a virtual display area 112. The newly formed display area 110 is divided into a main display area 111 and a virtual display area 112. The virtual display area 112 copies the image of any N rows of adjacent pixels in the main display area 111 for display. The virtual display area 112 is provided with scan lines 130 and data lines 140, as well as pixels 150 formed by the scan lines and data lines. A brightness acquisition circuit 220 is provided in the virtual display area 112. On the light-emitting surface of the display device 100, the brightness of the image in the virtual display area is collected. The flicker level is calculated based on the brightness change, and then the original common voltage is adjusted according to the flicker level until the flicker level is controlled within a preset range. The adjustment of the common voltage is then stopped, and the adjusted common voltage replaces the original common voltage and is input to the common line 160 or common line of the display panel 300 to drive the next frame of the display image. This avoids the problem of screen flicker caused by the voltage change of the liquid crystal capacitor due to parasitic capacitance and the continued use of the original common voltage.

[0051] This application directly sets the brightness acquisition circuit in the virtual display area, eliminating the need for external instruments to test the flicker level of the main display area and adjust the common voltage value. This avoids the high cost of external instruments, the limited number of configurable instruments, and the long production line operation time required to adjust the optimal VCOM, which increases manufacturing costs. In addition, it eliminates the need to set the brightness acquisition circuit in the main display area, thus avoiding the brightness acquisition circuit affecting the light transmittance of the main display area.

[0052] Additionally, it should be noted that, considering that when detecting changes in screen brightness, a single pixel typically displays a relatively simple image without a reference point, making it less persuasive, the virtual display area generally uses two rows of pixels. Step S1 includes...

[0053] S11: The driving signals for the last two rows of pixels in the main display area are sent to the virtual display area, so that the display images of the last two rows of pixels in the virtual display area are the same as those in the main display area.

[0054] It is possible to copy any two rows of pixels in the virtual display area to the main display area, since the common voltage of the entire layer is adjusted. Regardless of which two rows of pixels in the main display area are selected, the flicker level can be adjusted accordingly. However, considering that the virtual display area needs the same driving signals, such as scan signals and data signals, to copy the image of the selected two rows of pixels, if two rows of pixels that are far apart are selected, the scan signal needs to obtain the images of the two rows of pixels in the main display area and the two rows of pixels in the virtual display area at the same time. This requires designing long traces, which increases the difficulty of the trace design. Therefore, the two rows of pixels in the virtual display area copy the display image of the last two rows of pixels in the main display area. The last two rows of pixels are close to the pixels in the virtual display area, so it is not necessary to set up too long traces to copy the display.

[0055] like Figure 5 As shown, as a second embodiment of this application, it is a further improvement on the first embodiment described above. Generally, before step S1, it also includes the following step:

[0056] S0: Select a preset frame to display in the current frame;

[0057] Among them, when the preset image is set to the same frame, all positive polarity pixels are fully bright at 127 gray levels and all negative polarity pixels are fully dark, or all positive polarity pixels are fully dark and all negative polarity pixels are fully bright at 127 gray levels.

[0058] refer to Figures 1 to 5 As shown, before calculating the flicker level by detecting the brightness of the screen, a specific screen can be selected to complete the flicker level calculation. Therefore, before step S1, a preset screen can be output and displayed through the timing controller (TCON). This preset screen is a flicker screen, which can be modified and set via TCON code. The flicker screen is usually set so that in the same frame, all positive polarities are fully lit at 127 gray, and all negative polarities are completely dark (or all positive polarities are completely dark, and all negative polarities are fully lit at 127 gray). 127 gray is chosen because the VT curve of the liquid crystal is steepest at 127 gray. A slight change in the voltage across the liquid crystal terminals can result in a significant change in brightness. Therefore, the flicker value is adjusted under the 127 gray display surface.

[0059] By designing several rows of dummy pixels on the panel and covering them with a photodiode film to detect brightness changes under the flicker image, automatic optimal VCOM adjustment of the drive circuit can be achieved. This reduces the use of production line equipment and optimizes the production line debugging process.

[0060] Furthermore, the brightness acquisition circuit 220 corresponding to the virtual display area includes a photodiode and a first resistor R1 connected in series with the photodiode. The photodiode film 170 forms the photodiode D1. The step of detecting the brightness change of the virtual display area and calculating the flicker level includes:

[0061] The photodiode generates different voltage values ​​according to the brightness changes of the display area, and calculates the flicker level using a preset calculation formula;

[0062] The preset calculation formula is as follows: Vr is the voltage across the resistor.

[0063] TCON detects the voltage value Vr across the first resistor connected in series with the photodiode, and then converts it into a voltage formula using the flicker calculation formula. The flicker level is calculated. TCON controls the gamma chip (an IC that generates VCOM voltage) via the I2C bus to fine-tune the VCOM voltage above and below the original VCOM value. After fine-tuning the VCOM voltage, the flicker level is detected and calculated again. This process is repeated continuously to find the lowest flicker level. The corresponding VCOM voltage is the optimal VCOM. Finally, it is written to the VNM (non-volatile memory) of the gamma IC, thus completing the process of automatically adjusting the optimal VCOM.

[0064] like Figure 6 As shown, the third embodiment of this application is a further improvement on the first embodiment described above, and includes the following steps before step S1:

[0065] S0': Detect whether the timing control chip generates a common voltage adjustment signal. If a common voltage adjustment signal is detected, execute the step of inputting the driving signals of any N adjacent rows of pixels in the main display area to the virtual display area, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area. If no common voltage adjustment signal is detected, use the original common voltage to drive the display.

[0066] Before executing step S1, it is first checked whether the timing control chip generates a common voltage adjustment signal. If a common voltage adjustment signal is generated, step S1 and subsequent steps are executed. If no common voltage adjustment signal is generated, step S1 and subsequent steps are not executed. This embodiment mainly illustrates that the adjustment of the common voltage is not arbitrary at any time, but only when a common voltage adjustment signal is generated.

[0067] Furthermore, the timing control chip generates a common voltage adjustment signal in two ways. First, the display panel monitors its own usage time to control the generation of the common voltage adjustment signal. If the usage time exceeds a preset time, the timing control chip generates a common voltage adjustment signal; if it does not exceed the preset time, no common voltage adjustment signal is generated. Second, it is manually controlled. The display device also includes a common voltage adjustment signal trigger circuit. This circuit is controlled by an external switch or a remote control. When the common voltage signal trigger circuit is active, the timing control chip generates a common voltage adjustment signal; if it is not active, no common voltage adjustment signal is generated. This increases the user's connection to the product and enhances the display panel's appeal.

[0068] Of course, unlike the above, the adjustment of the common voltage can also be adjusted in real time. That is, as long as the screen is displayed, the brightness change collected by the photodiode film set under the virtual display area is used to obtain the corresponding voltage. The flicker level is obtained through the voltage value. The timing control chip adjusts the VCOM value according to the flicker level. After adjustment, the flicker level is calculated again. During all the adjustment processes, when the flicker level is the minimum, the corresponding VCOM is selected to drive the display of the entire display panel.

[0069] like Figure 7As shown, as a fourth embodiment of this application, a driving circuit 200 for a display device is disclosed. The display device is driven using the driving method described in any of the above embodiments. The driving circuit 200 includes a timing control chip 211, a gamma chip 212, and a brightness acquisition circuit 220. The timing control chip 211 and the gamma chip 212 are disposed on a control board 210. The timing control chip 211 outputs a driving signal corresponding to the current display screen to the main display area 111 and the virtual display area 112 in the display area 110 of the display device 100. The brightness acquisition circuit 220 is disposed in the virtual display area 112 along the direction of the light-emitting surface of the display panel 300 and connected to the timing control chip 211. The brightness acquisition circuit 220 is used to acquire the brightness of the screen in the virtual display area 112 and calculate the flicker level and feed it back to the timing control chip 211.

[0070] The timing control chip 211 adjusts the original common voltage value according to the flicker level until the flicker level calculated by the brightness acquisition circuit 220 is within a preset range, so as to stop the adjustment of the common voltage and output the adjusted common voltage to the common line 160 or the common electrode to drive the next frame of the display screen.

[0071] The brightness acquisition circuit 220 includes a photodiode D1, which is formed by a thin film of a photodiode film 170 disposed on the sub-pixel of the virtual display area 112. One end of the photodiode is connected to the power supply voltage, and the other end is grounded through a first resistor R1. The two ends of the first resistor R1 are respectively connected to the timing control chip 211.

[0072] Specifically, the timing control chip 211 outputs a flicker image (which can be modified via TCON code). The TCON then detects the voltage value Vr of the series resistor of the photodiode and converts it into a voltage formula using the flicker calculation formula. The flicker level is calculated. TCON controls the Gamma IC (an IC that generates VCOM voltage) via the I2C bus to fine-tune the VCOM voltage above and below the original VCOM value. After fine-tuning the VCOM voltage, the flicker level is detected and calculated again. This process is repeated continuously to find the lowest flicker level. The corresponding VCOM voltage is the optimal VCOM. Finally, the value is written to the VNM (non-volatile memory) of the Gamma IC, thus completing the process of automatically adjusting the optimal VCOM.

[0073] Furthermore, such as Figure 8As shown, the fifth embodiment of this application is a further improvement on the fourth embodiment described above. The timing control chip 211 includes a timer 213, which monitors the usage time of the display device 100. If the usage time exceeds a preset time, the timing control chip 211 generates a common voltage adjustment signal and executes steps S1 to S3 in the first embodiment. If the preset time is not exceeded, no common voltage adjustment signal is generated. The timing control chip controls the gamma chip to output the common voltage normally, and the brightness acquisition circuit 220 does not input power supply voltage so that the photodiode can work.

[0074] In addition, the display device also includes a common voltage adjustment signal trigger circuit 214. The common voltage adjustment signal trigger circuit 214 is controlled to be turned on by an external switch (not shown in the figure) of the display device or by a remote control corresponding to the display device. When the common voltage signal trigger circuit 214 is turned on, the timing control chip generates a common voltage adjustment signal, and executes the driving signal of any N adjacent rows of pixels in the input main display area to the virtual display area, so that the display screen of the virtual display area is the same as that of the corresponding N rows of pixels in the main display area. If the common voltage signal trigger circuit is not turned on, no common voltage adjustment signal is generated, and the original common voltage is used to drive the display, and the brightness acquisition circuit 220 stops working.

[0075] When the display panel is on the client side, the SOC can be controlled using a remote control. Automatic VCOM adjustment can be configured in the SOC settings interface. The SOC is connected to the panel (with reserved IO interface) and informs the TCON to perform VCOM adjustment through IO. At this time, the TCON generates a built-in flickering image. The brightness acquisition circuit collects the brightness change and calculates the flicker value. It communicates with the Gamma IC through the I2C bus and adjusts the VCOM voltage until the flicker value is minimized, thus completing the VCOM adjustment.

[0076] like Figure 9As shown, in the sixth embodiment of this application, unlike the embodiments described above, the brightness acquisition circuit 220 includes a photodiode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor R4, a second capacitor R5, and an operational amplifier U1. One end of the first resistor R1 is grounded, and the other end is connected to the input terminal of the photodiode D1 and the positive terminal of the operational amplifier, respectively. The output terminal of the photodiode D1 is connected to the input terminal of the second resistor R2 and the negative terminal of the operational amplifier U1. The two ends of the first capacitor C1 are connected to the input terminal and the output terminal of the second resistor R2, respectively. The output terminal of the second resistor R2 is connected to the input terminal of the third resistor R3. The output terminal of the operational amplifier U1 is connected to the input terminal of the third resistor R3. The output terminal of the third resistor R3 is connected to a timing control chip. One end of the second capacitor C2 is connected between the third resistor R3 and the timing control chip 211, and the other end is grounded.

[0077] Specifically, D1 is a photodiode (composed of a thin film photodiode within the panel). When the light intensity changes, the current generated by D1 is proportional to the light intensity. D1, along with resistors R1 and R2 and operational amplifier U1, forms a light intensity to voltage conversion circuit. When D1 receives light, it generates a current Id, and the voltage supplied to TCON at this time is Id*(R1+R2). C1 is a small capacitor to prevent the operational amplifier from becoming unstable due to the parasitic capacitance of D1. The resistance values ​​of R1 and R2 should be consistent to avoid common-mode interference in the operating environment amplified by operational amplifier U1. R3 and C2 form a low-pass filter to reduce high-frequency noise at the operational amplifier output.

[0078] like Figure 10 As shown, as the seventh embodiment of this application, a display device 100 is disclosed. The display device includes a driving circuit 200 as described in any of the above embodiments and a display panel 300. The driving circuit 200 is used to adjust the common voltage VCOM in the display panel 300 to drive the display panel 300 to display.

[0079] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application.

[0080] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0081] The technical solution of this application can be widely used in driving circuits of various display panels, such as driving circuits of TN (Twisted Nematic) display panels, driving circuits of IPS (In-Plane Switching) display panels, driving circuits of VA (Vertical Alignment) display panels, and driving circuits of MVA (Multi-Domain Vertical Alignment) display panels. Of course, it can also be used for driving circuits of other types of display panels, such as driving circuits of OLED (Organic Light-Emitting Diode) display panels, and the above solution is applicable to all of them.

[0082] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving method of a display device, characterized by, The display device comprises a display area and a non-display area arranged around the display area, and a plurality of pixels arranged in multiple rows and columns are arranged around the scan lines and the data lines in the display area, the display area comprises a main display area and a virtual display area, and the steps comprise: inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area, so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area; detecting the brightness change of the virtual display area to calculate the flicker degree; and adjusting the original common voltage according to the flicker degree until the flicker degree is controlled within a preset range, stopping the adjustment of the common voltage, and replacing the original common voltage with the adjusted common voltage to drive the next frame of display picture; wherein N is a natural number greater than or equal to 2; the step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area, so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area, comprises the following steps: detecting whether the timing control chip generates a common voltage adjustment signal, if the common voltage adjustment signal is detected, executing the step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area, so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area, if the common voltage adjustment signal is not detected, using the original common voltage to drive the display.

2. The driving method according to claim 1, wherein The step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area, so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area, further comprises the following steps: selecting a preset picture to display in the current frame picture; wherein the preset picture is set to all positive polarity pixels being full bright 127 gray scale, all negative polarity pixels being full dark or all positive polarity pixels being full dark, and all negative polarity pixels being full bright 127 gray scale at the same frame.

3. The driving method of claim 1, wherein The step of detecting whether the timing control chip generates a common voltage adjustment signal, if the common voltage adjustment signal is detected, executing the step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area, so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area, if the common voltage adjustment signal is not detected, using the original common voltage to drive the display, comprises the following steps: monitoring the use time of the display device, if the use time exceeds a preset time, the timing control chip generates a common voltage adjustment signal, if the use time does not exceed the preset time, the timing control chip does not generate a common voltage adjustment signal.

4. The driving method of claim 1, wherein The display device further comprises a common voltage adjustment signal trigger circuit, which is controlled to be turned on by an external switch of the display device or by a corresponding remote controller of the display device, and the detection of whether the timing control chip generates a common voltage adjustment signal, if the common voltage adjustment signal is detected, the step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area, and if the common voltage adjustment signal is not detected, the step of driving the display using the original common voltage comprises: If the common voltage adjustment signal trigger circuit is turned on, the timing control chip generates a common voltage adjustment signal; if the common voltage adjustment signal trigger circuit is not turned on, no common voltage adjustment signal is generated.

5. The driving method of claim 1, wherein The step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area comprises: The step of inputting the driving signals of any adjacent N rows of pixels in the main display area into the virtual display area so that the display picture of the N rows of pixels in the virtual display area is the same as that of the main display area comprises:

6. The driving method of claim 1, wherein The light-dependent resistor generates different voltage values according to the brightness change of the display area, and the flicker degree is calculated by a preset calculation formula; The driving circuit comprises: wherein the preset calculation formula is S = Vr / R , Vr is the voltage value of the resistor.

7. A driving circuit of a display device, which drives the display device using the driving method according to any one of claims 1 to 6, characterized by a timing control chip, which outputs the driving signals corresponding to the current display picture to the main display area and the virtual display area in the display area of the display device; and a brightness acquisition circuit, which is arranged in the direction of the light-emitting surface of the display panel along the virtual display area and is connected to the timing control chip, and is used to acquire the brightness of the picture of the virtual display area and calculate the flicker degree and feed back to the timing control chip; The timing control chip adjusts the original common voltage value according to the flicker degree until the flicker degree calculated by the brightness acquisition circuit is within a preset range, so as to stop the adjustment of the common voltage and replace the original common voltage with the adjusted common voltage to drive the next frame of display picture. The brightness acquisition circuit comprises a light-dependent resistor, which is formed by a light-dependent resistor film arranged on the sub-pixel of the virtual display area, one end of the light-dependent resistor is connected to a power supply voltage, and the other end is connected to ground through a first resistor, and the two ends of the first resistor are respectively connected to the timing control chip.

8. The driving circuit of a display device according to claim 7, wherein The driving circuit according to any one of claims 7-8 is used to adjust the common voltage in the display panel to drive the display panel to display.

9. A display device, characterized by comprising: ​

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