Driving circuit, driving method and display device

Abstract

The present application discloses a driving circuit, a driving method, and a display device. The driving circuit includes a timing control module, a temperature detection module, and a gamma voltage adjustment module. The timing control module is disposed on a first circuit board. The temperature detection module is used to detect the temperature on a second circuit board. One end of the gamma voltage adjustment module is connected to the timing control module, and the other end is connected to a data driving module via a gamma trace on the second circuit board. The second circuit board is a glass-based circuit board. The gamma voltage adjustment module outputs different gamma voltages to the data driving module based on the resistance of the gamma trace on the glass-based circuit board and the temperature value detected by the temperature detection module. The data driving module generates a corresponding grayscale signal and inputs it to the display panel. The present application adjusts the gamma voltage output to the data driving module by obtaining the temperature of the glass-based circuit board and the resistance of the gamma trace, thereby improving the gamma voltage inaccuracy caused by temperature-induced changes in the resistance of the gamma trace.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving circuit, a driving method and a display device. Background Art

[0002] As a flat-panel display device, TFT-LCD (Thin Film Transistor Liquid Crystal Display) is increasingly being used in the field of high-performance displays due to its small size, low power consumption, zero radiation, and relatively low manufacturing cost. When a TFT-LCD is displaying, each row of gate lines on the display panel is scanned row by row to turn on the pixel units connected to the row of gate lines, and the data lines output data signals to the turned-on pixel units to charge the pixel units.

[0003] In order to further reduce the production cost of liquid crystal display products, existing circuits for scanning gate lines often adopt a G0A (Gate Driver on Array) design to integrate a TFT (Thin Film Transistor) gate switch circuit on the array substrate of the display panel to form a scanning drive for the display panel; a glass substrate is used as a glass-based circuit board, but the manufacturing process of the glass-based circuit board is easily affected by factors such as factory manufacturing, machine parameters, human operation, material properties, uniformity of the large glass panel, and production environment. Its uncontrollability is much higher than that of a normal PCB board. In particular, the resistance of the gamma traces on the glass-based circuit board changes with temperature, resulting in inaccurate output gamma voltage, thereby causing abnormal grayscale signals and affecting display. Summary of the Invention

[0004] The purpose of the present application is to provide a driving circuit, a driving method and a display device that improve the problem of temperature-induced resistance changes in gamma wiring, which leads to abnormal gamma voltage, and further causes inaccurate grayscale signals and abnormal display.

[0005] The present application discloses a driving circuit, which is used to drive a display panel to display. The driving circuit includes a timing control module, a temperature detection module and a gamma voltage adjustment module; the timing control module is arranged on a first circuit board; the temperature detection module is arranged on a second circuit board, and is used to detect the temperature on the second circuit board and feed back to the timing control module; the gamma voltage adjustment module is connected to the timing control module at one end and to the data driving module at the other end via a gamma trace on the second circuit board; wherein the second circuit board is a glass-based circuit board, and the gamma voltage adjustment module outputs different gamma voltages to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value detected by the temperature detection module, and the data driving module generates a corresponding grayscale signal which is input to the display panel.

[0006] Optionally, the driving circuit includes an analog-to-digital converter, the temperature detection module includes a first high-precision resistor and a temperature resistor connected in series, the temperature resistor is arranged on the glass-based circuit board, one end of the analog-to-digital converter is connected to the first resistor, and the other end is connected to the timing control module;

[0007] A power supply chip is also provided on the first circuit board, and the power supply chip is connected to the analog-to-digital converter through a first high-precision resistor. One end of the temperature resistor is connected to the first node between the first high-precision resistor and the analog-to-digital converter, and the other end is grounded. The analog-to-digital converter converts the analog voltage of the first node into a digital voltage and sends it to the timing control module. The timing control module generates a corresponding temperature value according to the voltage fluctuation of the first node, and generates a first lookup table based on the voltage value and temperature value of the first node.

[0008] Optionally, the gamma voltage adjustment module generates an adjusted gamma voltage through a first lookup table and preset formulas ① to ④ and outputs it to the data driving module. The preset formulas ① to ④ are specifically as follows:

[0009] Vg1=V1+Vdifference……①

[0010] V difference=Vg(x)-Vg(20)……②

[0011] Vg(x)= I*Rg(x)……③

[0012] Vg(20)=I*Rg(20)……④

[0013] Where Vg(x) is the voltage of the gamma trace at temperature x, Vg(20) is the voltage of the gamma trace at temperature 20°, I is the current of the gamma trace, and Rg is the resistance of the gamma trace.

[0014] Optionally, the driving circuit includes a gamma voltage detection circuit and a resistance adjustment circuit, the resistance adjustment circuit including a resistor string consisting of a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor connected in series in sequence, and a switch group, the resistor string being connected in series on the gamma trace, the switch group including a first switch group, a second switch group, a third switch group, and a fourth switch group, and the resistance adjustment circuit further including a first transistor, a second transistor, a third transistor, and a fourth transistor; the first transistor having an input end connected between the first resistor and the second resistor, an output end connected to the output end of the fifth resistor, and a control end connected to the output end of a switching signal through the first switch group; the second transistor having an input end connected between the second resistor and the third resistor, an output end connected to the output end of the fifth resistor, and a control end connected to the output end of the switching signal through the second switch group; the third transistor having an input end connected between the third resistor and the fourth resistor, an output end connected to the output end of the fifth resistor, and a control end connected to the output end of the switching signal through the third switch group; the fourth transistor having an input end connected between the fourth resistor and the fifth resistor, an output end connected to the output end of the fifth resistor, and a control end connected to the output end of the switching signal through the fourth switch group;

[0015] Wherein, each switch group includes two switch tubes connected in series, the first switch group includes a first switch tube and a second switch tube connected in series, the second switch group includes a third switch tube and a fourth switch tube connected in series, the third switch group includes a fifth switch tube and a sixth switch tube connected in series, and the fourth switch group includes a seventh switch tube and an eighth switch tube connected in series; the input ends of the first switch tube, the third switch tube, the fifth switch tube, and the seventh switch tube are connected to the output end of the switching signal, the output end of the second switch tube is connected to the control end of the first transistor, the output end of the fourth switch tube is connected to the control end of the second transistor, the output end of the sixth switch tube is connected to the control end of the third transistor, and the output end of the eighth switch tube is connected to the control end of the third transistor. The output end of the switch is connected to the control end of the fourth transistor, the control end of the first switch tube and the control end of the third switch tube receive a first control signal to be turned on or off, the control end of the second switch tube and the control end of the sixth switch tube receive a second control signal to be turned on or off, the control end of the fourth switch tube and the control end of the eighth switch tube receive a third control signal to be turned on or off, and the control end of the fifth switch tube and the control end of the seventh switch tube receive a fourth control signal to be turned on or off. The gamma voltage detection circuit detects the gamma voltage output to the data driving circuit, generates a corresponding control signal based on the detected gamma voltage to connect to the corresponding resistor, and generates a new gamma voltage to be output to the data driving circuit.

[0016] The present application also discloses a driving method for driving any of the above driving circuits, the driving method comprising:

[0017] Get the temperature value on the glass-based circuit board;

[0018] Different gamma voltages are output to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board. The data driving module generates corresponding grayscale signals and inputs them to the display panel.

[0019] Optionally, the driving circuit includes an analog-to-digital converter, the temperature detection module includes a first resistor and a temperature resistor connected in series, one end of the analog-to-digital converter is connected to the first high-precision resistor, and the other end is connected to the timing control module; the first circuit board is also provided with a power chip, the power chip is connected to the analog-to-digital converter through the first high-precision resistor, one end of the temperature resistor is connected to a first node between the first high-precision resistor and the analog-to-digital converter, and the other end is grounded; the step of obtaining the temperature value on the glass-based circuit board includes:

[0020] The analog-to-digital converter obtains a voltage value of the first node, converts the voltage value into a binary value, and sends the binary value to the timing control module. The timing control module obtains a corresponding temperature value based on a first lookup table.

[0021] Optionally, the driving circuit includes an analog-to-digital converter, the temperature detection module includes a first resistor and a temperature resistor connected in series, one end of the analog-to-digital converter is connected to the first resistor, and the other end is connected to the timing control module; the first circuit board is also provided with a power chip, the power chip is connected to the analog-to-digital converter through the first resistor, one end of the temperature resistor is connected to a first node between the first resistor and the analog-to-digital converter, and the other end is grounded; the step of obtaining the temperature value on the glass-based circuit board includes:

[0022] Calculating the length and width of the temperature resistor through software simulation, and obtaining the resistance value of the temperature resistor based on a first preset formula;

[0023] Obtaining a voltage value of the first node based on a second preset formula, converting the voltage value of the first node into a binary value and sending the binary value to the timing control module, recording a corresponding relationship between the binary value and the temperature, and reading the binary value provided by the analog-to-digital converter to obtain the temperature of the glass-based circuit board;

[0024] The first preset formula is Rs = ρL / A, where ρ is the resistivity value, and the resistivity relationship at each temperature is ρT = ρ0 (1 + αT). ρT represents the resistivity value at temperature T, ρ0 represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity.

[0025] The second preset formula is Vs=VDD*Rs / (R1+Rs), where Vs is the voltage value of the first node, VDD is the voltage value output by the power chip, R1 is the resistance value of the first resistor, and Rs is the resistance value of the temperature resistor.

[0026] Optionally, the step of outputting different gamma voltages to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board, and the data driving module generating corresponding grayscale signals and inputting them to the display panel includes:

[0027] Outputting different gamma voltages according to the resistance of the gamma traces on the glass-based circuit board and the temperature value of the glass-based circuit board;

[0028] Detect whether the output gamma voltage meets the preset requirements. If so, directly output it to the data driving module. If not, connect the series resistance adjustment circuit to adjust the gamma voltage, and output the adjusted gamma voltage to the data driving module.

[0029] Optionally, the timing control module includes a gamma voltage output control module, and the step of outputting different gamma voltages to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board, wherein the data driving module generates a corresponding grayscale signal and inputs it to the display panel includes:

[0030] The timing control module obtains the real-time temperature of the glass-based circuit board according to calculation, and compares the real-time temperature with the first preset temperature and the second preset temperature;

[0031] If the temperature is lower than the first preset temperature, directly outputting the original gamma voltage to the data driving module;

[0032] If the temperature is greater than the first preset temperature and less than the second preset temperature, generating a compensated gamma voltage to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value of the glass-based circuit board;

[0033] If the temperature is greater than the second preset temperature, no gamma voltage is output to the data driving module, and the power chip is controlled to be powered off at the same time.

[0034] The present application also discloses a display device, which includes a driving circuit as described above and a display panel, wherein the driving circuit drives the display panel using any of the driving methods described above.

[0035] While the present application uses a glass-based circuit board to reduce costs, a temperature detection module is also set on the glass-based circuit board to detect the temperature on the glass-based circuit board and feed the temperature back to the timing control module. The gamma voltage adjustment module outputs different gamma voltages to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value detected by the temperature detection module. The data driving module generates a corresponding grayscale signal and inputs it to the display panel, thereby improving the gamma voltage abnormality caused by the resistance change of the gamma trace due to temperature, ensuring the accuracy of the gamma voltage transmission and the accuracy of the grayscale signal, and improving and enhancing the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0037] Figure 1 is a schematic structural diagram of a driving circuit according to a first embodiment of the present application;

[0038] Figure 2 is a partial structural diagram of a driving circuit according to a second embodiment of the present application;

[0039] Figure 3 is a partial structural diagram of a driving circuit according to a third embodiment of the present application;

[0040] Figure 4 1 is a schematic structural diagram of a driving circuit according to a fourth embodiment of the present application;

[0041] Figure 5 is a schematic flow chart of a driving method according to a fifth embodiment of the present application;

[0042] Figure 6 is a flowchart of a driving method according to a sixth embodiment of the present application;

[0043] Figure 7 is a flowchart of a driving method according to a seventh embodiment of the present application;

[0044] Figure 8 is a schematic flow chart of a driving method according to an eighth embodiment of the present application;

[0045] Figure 9 It is a structural schematic diagram of a display device according to the ninth embodiment of the present application.

[0046] Among them, 100, driving circuit; 110, timing control module; 120, temperature detection module; 130, gamma voltage adjustment module; 140, data driving module; 150, first circuit board; 160, second circuit board; 170, analog-to-digital converter; 180, gamma voltage detection circuit; 190, resistance adjustment circuit; 200, resistor string; 210, switch group; 211, first switch group; 212, second switch group; 213, third switch group; 214, fourth switch group; 220, power chip; 300, display panel; 400, display device; R1, first resistor; R2, second resistor Resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; T1, first transistor; T2, second transistor; T3, third transistor; T4, fourth transistor; S1, first switch tube; S2, second switch tube; S3, third switch tube; S4, fourth switch tube; S5, fifth switch tube; S6, sixth switch tube; S7, seventh switch tube; S8, eighth switch tube; b1, first control signal; b2, second control signal; b3, third control signal; b4, fourth control signal; Rs - temperature resistor; Ri - first high precision resistor; Rg - gamma trace resistor; Q - first node. DETAILED DESCRIPTION

[0047] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0048] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0049] refer to Figure 1 As shown, as a first embodiment of the present application, a driving circuit 100 is disclosed, which is used to drive a display panel 300 for display. The driving circuit 100 includes a timing control module 110, a temperature detection module 120, and a gamma voltage adjustment module 130. The timing control module 110 is arranged on a first circuit board 150. The temperature detection module 120 is arranged on a second circuit board 160, and is used to detect the temperature on the second circuit board 160 and feed back to the timing control module 110. The gamma voltage adjustment module 130 is connected to the timing control module 110 at one end and to the data driving module 140 at the other end via a gamma trace on the second circuit board 160. The second circuit board 160 is a glass-based circuit board. The gamma voltage adjustment module 130 outputs different gamma voltages to the data driving module 140 according to the resistance of the gamma trace on the glass-based circuit board and the temperature value detected by the temperature detection module 120. The data driving module 140 generates a corresponding grayscale signal and inputs it to the display panel 300.

[0050] In this embodiment, a glass substrate is used as a PCB board, that is, a glass-based circuit board, which can reduce costs. Since the impedance of glass is different from that of a normal PCB board, the impedance of the traces on the glass substrate is much greater than the impedance of the traces on the normal PCB (the difference is more than 10 times). The impedance of the traces 121 on the glass-based circuit board will seriously affect the transmission of voltage and current signals and other signals, such as gamma traces. If the impedance of the gamma traces cannot be controlled, especially under different temperatures, the temperature directly affects the resistance of the gamma traces, which will cause inaccurate gamma voltage, resulting in inaccurate grayscale signals, affecting the display of the display panel 300. Based on this, a circuit board is provided on the glass-based circuit board. The temperature detection module 120 and the gamma voltage adjustment module 130 are configured to output different gamma voltages to the data driving module 140 based on the resistance of the gamma traces on the glass-based circuit board and the temperature value detected by the temperature detection module 120. The resistance of the gamma curve is obtained based on the temperature on the glass-based circuit board, and the corresponding gamma voltage is output to the data driving module 140 based on the actual resistance. The data driving module 140 generates a corresponding data driving signal and inputs it to the display panel 300, thereby improving the problem of inaccurate gamma voltage caused by changes in the resistance of the gamma traces due to temperature, ensuring the accuracy of the grayscale signal, and improving and enhancing the display effect of the display panel 300.

[0051] refer to Figure 2 As shown in the second embodiment of the present application, it is a further refinement of the above first embodiment. Figure 2 As shown, the driving circuit 100 includes an analog-to-digital converter 170, the temperature detection module 120 includes a first high-precision resistor Ri and a temperature resistor Rs connected in series, the temperature resistor Rs is disposed on the glass-based circuit board, one end of the analog-to-digital converter 170 is connected to the first high-precision resistor Ri, and the other end is connected to the timing control module 110;

[0052] A power chip 220 is also provided on the first circuit board 150. The power chip 220 is connected to the analog-to-digital converter 170 through a first high-precision resistor. One end of the temperature resistor is connected to the first node Q between the first high-precision resistor and the analog-to-digital converter 170, and the other end is grounded. The analog-to-digital converter 170 converts the analog voltage of the first node Q into a digital voltage and sends it to the timing control module 110. The timing control module 110 generates a corresponding temperature value according to the voltage fluctuation of the first node Q, and generates a first lookup table based on the voltage value and temperature value of the first node Q; wherein the temperature resistor is formed by copper winding.

[0053] The first resistor receives a power supply voltage (VDD). The first circuit board 150 is a printed circuit board (PCBA). The VDD voltage is provided by a power IC 220 on the first circuit board 150 (PCBA). The first high-precision resistor Ri is placed on the first circuit board 150 (PCBA). It is unaffected by the temperature of the glass-based circuit board and its resistance value changes little with temperature. It is connected in series with a temperature resistor Rs. The temperature resistor Rs is a resistor used to detect the temperature of the glass-based circuit board. It is placed on the glass substrate and consists of a copper winding. It is used to reflect the actual temperature of the glass substrate. Because there are no components on the glass substrate that generate heat, the temperature of the temperature resistor can reflect the actual ambient temperature without being affected by other factors. Figure 2 It can be seen that the voltage divider value Vs of the temperature resistor Rs and the first resistor R1 is detected and given to the analog-to-digital converter 170 (ADC), which converts the voltage into binary data and gives it to the timing control module 110. Tcon determines the specific temperature value based on the received data, and the voltage fluctuation of Vs can directly reflect the temperature change. The gamma voltage adjustment module 130 obtains the temperature value from the timing control module 110, and then generates the corresponding gamma voltage according to the resistance of the gamma trace on the glass-based circuit board.

[0054] Furthermore, the gamma voltage adjustment module 130 generates an adjusted gamma voltage through a first lookup table and a preset formula and outputs it to the data driving module 140. The preset formula is as follows:

[0055] Vg1=V1+Vdifference……①

[0056] V difference=Vg(x)-Vg(20)……②

[0057] Vg(x)= I*Rg(x)……③

[0058] Vg(20)=I*Rg(20)……④

[0059] Where Vg(x) is the voltage of the gamma trace at temperature x, Vg(20) is the voltage of the gamma trace at temperature 20°, I is the current of the gamma trace, and Rg is the resistance of the gamma trace.

[0060] At the beginning of the glass base design, it is necessary to calculate the length and width of the temperature resistor Rs through software simulation, so that the resistance value of the temperature resistor can be obtained according to R=ρL / A. ρ can use the value at 0℃, so at this time the temperature resistor R0 at 0℃ is obtained, as shown in Table 1. Select the temperature range of (-30℃, 80℃). The size of the temperature resistor corresponding to each temperature can be known from Table 1. Then, according to Vs=VDD*Rs / (R1+Rs), the corresponding induced voltage value Vs is obtained. ADC converts the corresponding voltage value into a binary value and gives it to Tcon to record the correspondence between the binary value and the temperature. When the binary value given by ADC is read, the temperature of the glass base at this time can be known.

[0061] Table 1

[0062]

[0063] After knowing the temperature of the glass base, since there is no component heating in the entire glass base, the temperature of each place is the same and is affected by the ambient temperature. Then the temperature of the temperature resistor is the temperature of the entire glass base. horse For routing, the traces need to be routed from the PCBA to the data driver module 140 (Source Driver). The path through the glass substrate is a single trace. The trace length, width, and theoretical resistance are known during layout design. The gamma trace impedance at various temperatures can be calculated using R = ρL / A, where L / A is a constant and ρ varies with temperature. The resistivity relationship at various temperatures is ρT = ρ0 (1 + αT), where ρT represents the resistivity at temperature T, ρ0 represents the resistivity at 0°C, and α represents the temperature coefficient of copper resistivity. Because display effects are debugged at room temperature, the gamma voltage at 20°C is used as the baseline. To ensure gamma voltage accuracy, the voltage needs to be adjusted for different temperatures.

[0064] Taking gamma1 as an example, refer to Table 2, set the gamma voltage value at room temperature of 20℃ as the reference, V1 is the debug output voltage, that is, the output voltage of the gamma chip (gamma IC) of the PCBA, then the voltage reaching the Source Driver is V1-I*Rg (20), and the Gamma voltage deviation that needs to be compensated after temperature changes is: V difference = Vg (x) - Vg (20) = (V1-I*Rg (20)) - (V1-I*Rg (x)) = I*Rg (x) - I*Rg (20), the compensated voltage is V difference, then the output voltage of the gammaIC that needs to be adjusted is Vg1 = V1 + V difference, V1 is the reference voltage at 20, so that it can be ensured that the voltage reaching the data driver module 140 is consistent regardless of the temperature.

[0065] Table 2

[0066]

[0067] refer to Figure 3 As shown, as the third embodiment of the present application, it is a further refinement of any of the above embodiments.

[0068] Furthermore, the driving circuit 100 includes a gamma voltage detection circuit 180 and a resistance adjustment circuit 190, the resistance adjustment circuit 190 includes a resistor string 200 and a switch group 210, which are sequentially connected in series by a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the resistor string 200 is connected in series on the signal trace, the switch group 210 includes a first switch group 211, a second switch group 212, a third switch group 213 and a fourth switch group 214, the resistance adjustment circuit 190 also includes a first transistor T1, a second transistor T2, a third transistor T3 and a fourth transistor T4, which may of course be four other types of switch tubes; the input end of the first transistor T1 is connected between the first resistor R1 and the second resistor R2, and the output end The first transistor T2 is connected to the output end of the fifth resistor R5, and the control end is connected to the output end of the switching signal through the first switch group 211; the input end of the second transistor T2 is connected between the second resistor R2 and the third resistor R3, the output end is connected to the output end of the fifth resistor R5, and the control end is connected to the output end of the switching signal through the second switch group 212; the input end of the third transistor T3 is connected between the third resistor R3 and the fourth resistor R4, the output end is connected to the output end of the fifth resistor R5, and the control end is connected to the output end of the switching signal through the third switch group 213; the input end of the fourth transistor T4 is connected between the fourth resistor R4 and the fifth resistor R5, the output end is connected to the output end of the fifth resistor R5, and the control end is connected to the output end of the switching signal through the fourth switch group 214.

[0069] Each switch group 210 includes two switch tubes connected in series. The first switch group 211 includes a first switch tube S1 and a second switch tube S2 connected in series. The second switch group 212 includes a third switch tube S3 and a fourth switch tube S4 connected in series. The third switch group 213 includes a fifth switch tube S5 and a sixth switch tube S6 connected in series. The fourth switch group 214 includes a seventh switch tube S7 and an eighth switch tube S8 connected in series. The input ends of the first switch tube S1, the third switch tube S3, the fifth switch tube S5, and the seventh switch tube S7 are connected to the output end of the switching signal. The output end of the second switch tube S2 is connected to the control end of the first transistor T1. The output end of the fourth switch tube S4 is connected to the control end of the second transistor T2. The output end of the sixth switch tube S6 is connected to the control end of the third transistor T3. The output end of the eighth switch tube S8 is connected to the control end of the fourth transistor T4. The control end of the first switch tube S1 and the control end of the third switch tube S The control end of the second switch transistor S3 receives a first control signal b1 to turn on or off, the control end of the second switch transistor S2 and the control end of the sixth switch transistor S6 receive a second control signal b2 to turn on or off, the control end of the fourth switch transistor S4 and the control end of the eighth switch transistor S8 receive a third control signal b3 to turn on or off, and the control end of the fifth switch transistor S5 and the control end of the seventh switch transistor S7 receive a fourth control signal b4 to turn on or off. The gamma voltage detection circuit 180 detects the gamma voltage output to the data driving circuit 100, and generates a corresponding control signal based on the detected gamma voltage to connect to the corresponding resistor to generate a new gamma voltage to be output to the data driving circuit 100; the first control signal b1 and the fourth control signal b4 are a group of inverted signals, the second control signal b2 and the third control signal b3 are a group of inverted signals, and the first control signal b1 and the second control signal b2 are different control signals, which are generated based on the resistance of the routing signal.

[0070] A resistance adjustment circuit 190 is designed on the glass-based circuit board. After obtaining the temperature on the glass-based circuit board and the resistance of the gamma trace, a corresponding gamma voltage can be generated, or the original gamma voltage can be compensated and the compensated gamma voltage can be output to the data driving module 140. However, considering that the gamma voltage is transmitted, if the temperature continues to change, the resistance of the gamma trace may fluctuate partially, resulting in a certain error in the gamma voltage on the gamma trace. At this time, the resistance adjustment circuit 190 can be connected to compensate or adjust the adjusted gamma voltage again. The timing control module 110 will provide a control signal and a switch signal for selecting the matching resistor of the series resistance adjustment circuit 190. The control signal can be used to select the resistance of the series resistor. For example, in binary, 0 represents a low level and 1 represents a high level. If the second control signal b2 and the third control signal b3 are 1 and 1, then the fifth switch S5 and the sixth switch S6 are turned on, the corresponding paths are connected, and the control signal is input to the third transistor T3 through the fifth switch S5 and the sixth switch S6, turning on the third transistor T3. Other paths are closed, and the switch signal is high. At this time, the selected resistance is R1 + R2 + R3 = 30 ohms. For more accurate selection, multiple resistors can be set up and reserved, and different resistors can be selected based on the differences in the manufacturing process of different glass substrates.

[0071] Generally, the length and width of the temperature resistor are calculated through software simulation, and the resistance of the temperature resistor is obtained based on a first preset formula. The voltage value of the first node is obtained based on a second preset formula, and the voltage value of the first node is converted into a binary value and sent to the timing control module 110. The corresponding relationship between the binary value and the temperature is recorded, and the binary value provided by the analog-to-digital converter 170 is read to obtain the temperature of the glass-based circuit board.

[0072] Among them, the first preset formula is Rs=ρL / A, ρ is the resistivity value, the resistivity relationship at each temperature is ρT=ρ0(1+αT), ρT represents the resistivity value when the temperature is T, ρ0 represents the resistivity value when the temperature is 0°C, and α represents the temperature coefficient of copper resistivity; the second preset formula is Vs=VDD*Rs / (R1+Rs), Vs is the voltage value of the first node, VDD is the voltage value output by the power chip 220, R1 is the resistance value of the first resistor, and Rs is the resistance value of the temperature resistor.

[0073] The timing control module 110 stores the resistivity ρ at various temperatures. When the working temperature is fed back to the timing control module 110, the timing control module 110 calls the corresponding calculation formula. By R=ρL / A, the value of the first resistor R1 can be obtained based on the resistance detection before leaving the factory. Because ρ is the resistivity, a linear change value and the change rule of all glass bases is the same, based on the resistance value at room temperature of 25 degrees, it can be obtained that R1=ρ25*L / A→L / A=R1 / ρ25→R(T)=ρ(T)*L / A=ρ(T)*(R1 / ρ25), L / A of the same glass-based circuit board will not change with temperature and time, only ρ will change with temperature. In this way, the formula for the change of resistance of each glass base with temperature can be obtained. After obtaining the resistance, different resistors can be called for matching according to the previous scheme to overcome the impedance difference problem caused by the large difference between glass substrates due to process differences, thereby solving the glass-based signal transmission problem and the defect that the differential resistance changes due to temperature problems affect the impedance matching effect. Both aspects ensure the integrity of the signal and the stability of the display.

[0074] like Figure 4 As shown, as a fourth embodiment of the present application, a driving method is disclosed, which is used to drive the driving circuit as described in any of the above embodiments, and the driving method includes:

[0075] S1: Get the temperature value of the glass-based circuit board;

[0076] S2: Outputting different gamma voltages to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board. The data driving module generates corresponding grayscale signals and inputs them to the display panel.

[0077] In this application, reference is made to Figure 1 and Figure 4 As shown, in order to reduce costs, glass is used as a PCB board, so the traces are all set on the glass-based circuit board. Because the traces are set on the glass-based circuit board, the impedance is greater than the impedance on the ordinary circuit board. In addition, since the temperature change on the glass base will cause the resistance of the traces on the glass base to change, in order to avoid the impedance causing inaccurate or unstable transmission of voltage signals or other signals, the temperature value on the glass-based circuit board is obtained; the resistance of the gamma curve is determined according to the temperature, and different gamma voltages are output to the data driving module 140 according to the resistance of the gamma trace. The data driving module 140 generates a corresponding grayscale signal and inputs it to the display panel 300, thereby improving the resistance change of the gamma trace caused by temperature, thereby causing gamma voltage abnormality, ensuring the accuracy of gamma voltage transmission and the accuracy of grayscale signals, and improving and enhancing the display effect of the display panel 300.

[0078] like Figure 5 As shown, as the fifth embodiment of the present application, it is a further improvement and refinement of the above fourth embodiment, referring to Figure 2 and Figure 5 As shown, the driving circuit 100 includes an analog-to-digital converter 170, and the temperature detection module 120 includes a first resistor and a temperature resistor connected in series. One end of the analog-to-digital converter 170 is connected to the first resistor, and the other end is connected to the timing control module 110. The first circuit board 150 is also provided with a power chip 220, and the power chip 220 is connected to the analog-to-digital converter 170 via a first high-precision resistor Ri. One end of the temperature resistor is connected to a first node Q between the first resistor R1 and the analog-to-digital converter 170, and the other end is grounded. Step S1 includes:

[0079] S11: The analog-to-digital converter obtains a voltage value of the first node, converts the voltage value into a binary value, and sends the binary value to the timing control module. The timing control module obtains a corresponding temperature value based on a first lookup table.

[0080] In order to improve the accuracy of temperature detection, voltage changes are used in combination with binary conversion to determine the temperature. The voltage division of the first resistor is obtained through the impedance change of the temperature resistor itself. The voltage after voltage division is converted into binary data and given to the timing control board. The temperature and the corresponding voltage division voltage and the size of the temperature resistor are recorded to form a first lookup table, namely Table 1. In this way, when it is used later, other values can be quickly obtained through any one of the values, reducing the amount of calculation.

[0081] like Figure 6 As shown, as the sixth embodiment of the present application, it is a further refinement and improvement of the above fourth embodiment, referring to Figure 2 and Figure 6 As shown, the driving circuit 100 includes an analog-to-digital converter 170, the temperature detection module 120 includes a first resistor and a temperature resistor connected in series, one end of the analog-to-digital converter 170 is connected to the first resistor, and the other end is connected to the timing control module 110; the first circuit board 150 is also provided with a power chip 220, the power chip 220 is connected to the analog-to-digital converter 170 through the first resistor, one end of the temperature resistor is connected to a first node between the first resistor and the analog-to-digital converter 170, and the other end is grounded; the step S1 includes:

[0082] S11′: Calculating the length and width of the temperature resistor through software simulation, and obtaining the resistance value of the temperature resistor based on a first preset formula;

[0083] S12′: obtaining a voltage value of the first node based on a second preset formula, converting the voltage value of the first node into a binary value and sending it to the timing control module, recording the corresponding relationship between the binary value and the temperature, reading the binary value provided by the analog-to-digital converter, and obtaining the temperature of the glass-based circuit board;

[0084] The first preset formula is Rs = ρL / A, where ρ is the resistivity value, and the resistivity relationship at each temperature is ρT = ρ0 (1 + αT). ρT represents the resistivity value at temperature T, ρ0 represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity.

[0085] The second preset formula is Vs=VDD*Rs / (R1+Rs), where Vs is the voltage value of the first node, VDD is the voltage value output by the power chip 220, R1 is the resistance value of the first resistor, and Rs is the resistance value of the temperature resistor.

[0086] In this embodiment, an analog-to-digital converter 170 is added to realize binary conversion of the voltage of the first node, and the resistivity values at different temperatures are obtained by a first preset formula. The resistance value of the temperature resistor at the corresponding temperature is obtained based on the resistivity value, and then the value of the node voltage is obtained according to the temperature resistor, the first resistor and the power supply voltage. The voltage value of the first node is converted into a binary value and sent to the timing control module 110. The correspondence between the binary value and the temperature is recorded, and the binary value given by the analog-to-digital converter 170 is read to obtain the temperature of the glass-based circuit board.

[0087] like Figure 7 As shown, the seventh embodiment of the present application is a further refinement and improvement of the fifth embodiment.

[0088] The step S2 comprises:

[0089] S21: outputting different gamma voltages according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board;

[0090] S22: Detect whether the output gamma voltage meets the preset requirements. If so, directly output it to the data driving module. If not, connect a series resistor adjustment circuit to adjust the gamma voltage, and output the adjusted gamma voltage to the data driving module.

[0091] Different resistances of the gamma traces are obtained by varying the temperature, and different resistances output different compensated gamma voltages. However, this embodiment takes into account that the compensated gamma voltage may not be accurate enough when actually output to the data driver module. Therefore, a detection mechanism is added to detect whether the output gamma voltage meets preset requirements. If so, the gamma voltage is directly output to the data driver module. If not, a series resistance adjustment circuit is connected to adjust the gamma voltage.

[0092] refer to Figure 3 As shown, it should be noted that the resistance adjustment circuit 190 is the resistance adjustment circuit 190 in the third embodiment, including a resistor string 200 and a switch group 210 which are sequentially connected in series by a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the resistor string 200 is connected in series on the signal trace, the switch group 210 includes a first switch group 211, a second switch group 212, a third switch group 213 and a fourth switch group 214, and the resistance adjustment circuit 190 further includes a first transistor T1, a second transistor T2, a third transistor T3 and a fourth transistor T4; for specific connection relationships, refer to the text description and the third embodiment. Figure 3 The content shown in .

[0093] In step S22, when it is detected that the output gamma voltage does not meet the preset requirement, a first control signal, a second control signal, a third control signal, and a fourth control signal are generated based on the resistance of the gamma wiring, and the corresponding switch tubes are controlled to be turned on according to the first control signal, the second control signal, the third control signal, and the fourth control signal to connect the corresponding resistors to adjust the output gamma voltage; wherein the first control signal b1 is output to the control end of the first switch tube S1 and the control end of the third switch tube S3 to control the conduction or disconnection of the first switch tube S1 and the third switch tube S3, and the second control signal b2 is output to the control end of the second switch tube S2 and the control end of the sixth switch tube S The third control signal b3 is output to the control terminal of the fourth switch S4 and the control terminal of the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S4 and the eighth switch S8 to control the fourth switch S5 and the eighth switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fifth switch S5 and the seventh switch S7 to control the fourth switch S4 and the eighth switch S8 ...

[0094] like Figure 8 As shown, as the eighth embodiment of the present application, it is a further improvement and perfection of any of the above embodiments, referring to Figure 2 and Figure 8 As shown, the timing control module includes a gamma voltage output control module, and the step S2 includes:

[0095] S21': the timing control module obtains the real-time temperature of the glass-based circuit board according to calculation, and compares the real-time temperature with the first preset temperature and the second preset temperature;

[0096] S22': if the temperature is less than the first preset temperature, directly outputting the original gamma voltage to the data driving module;

[0097] S23': if the temperature is greater than the first preset temperature and less than the second preset temperature, generating a compensated gamma voltage to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value of the glass-based circuit board; and

[0098] S24 ′: If the temperature is greater than the second preset temperature, no gamma voltage is output to the data driving module, and the power chip 220 is controlled to be powered off at the same time.

[0099] In this embodiment, the main consideration is the problem caused by temperature changes. Generally, when the temperature is within a controllable range, such as a range less than a second preset temperature, the original gamma voltage can be normally output to the data driving module. Alternatively, a compensated gamma voltage can be generated and sent to the data driving module based on the resistance of the gamma traces on the glass-based circuit board and the temperature value of the glass-based circuit board. However, once the temperature exceeds the second preset temperature, excessive current may result, causing a short circuit and burning components in the display panel. In this case, there is no need to calculate the resistance based on the temperature. Instead, the power is directly cut off, and no voltage or current is output to the display panel.

[0100] like Figure 9 As shown, as the ninth embodiment of the present application, a display device 400 is disclosed, which includes the driving circuit 100 and the display panel 300 as described in any of the above embodiments, and the driving circuit 100 drives the display panel 300 using the driving method in the above embodiments.

[0101] refer to Figures 1 to 3 As shown, the present application uses a glass substrate as a glass-based circuit board for laying out wiring, and calculates the resistance of the gamma wiring on the glass-based circuit board by detecting the temperature value on the glass substrate to adjust or compensate the gamma voltage pre-input to the display panel 300, thereby ensuring the accuracy and stability of the voltage on the gamma wiring, improving the accuracy of the grayscale signal, and improving the display effect of the display panel 300.

[0102] It should be noted that the limitations of the various steps involved in this solution, without affecting the implementation of the specific solution, are not considered to limit the order of the steps, that is, the steps written in the front can be executed first, or can be executed 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. The inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0103] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A driving circuit for driving a display panel, characterized in that: The driving circuit includes: A timing control module is provided on the first circuit board; a temperature detection module, disposed on the second circuit board, for detecting the temperature of the second circuit board and feeding back the temperature to the timing control module; and a gamma voltage adjustment module, one end of which is connected to the timing control module, and the other end of which is connected to the data driving module via a gamma trace on the second circuit board; Among them, the second circuit board is a glass-based circuit board, and the gamma voltage adjustment module outputs different gamma voltages to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value detected by the temperature detection module. The data driving module generates a corresponding grayscale signal and inputs it to the display panel.

2. The driving circuit according to claim 1, wherein: The driving circuit includes an analog-to-digital converter, the temperature detection module includes a first high-precision resistor and a temperature resistor connected in series, the temperature resistor is arranged on the glass-based circuit board, one end of the analog-to-digital converter is connected to the first high-precision resistor, and the other end is connected to the timing control module; A power supply chip is also provided on the first circuit board, and the power supply chip is connected to the analog-to-digital converter through a first high-precision resistor. One end of the temperature resistor is connected to the first node between the first high-precision resistor and the analog-to-digital converter, and the other end is grounded. The analog-to-digital converter converts the analog voltage of the first node into a digital voltage and sends it to the timing control module. The timing control module generates a corresponding temperature value according to the voltage fluctuation of the first node, and generates a first lookup table based on the voltage value and temperature value of the first node.

3. The driving circuit according to claim 2, wherein: The gamma voltage adjustment module generates an adjusted gamma voltage through a first lookup table and preset formulas ① to ④ and outputs it to the data driving module. The preset formulas ① to ④ are specifically as follows: Vg1=V1+Vdifference……① V difference=Vg(x)-Vg(20)……② Vg(x)= I*Rg(x)……③ Vg(20)=I*Rg(20)……④ Where Vg(x) is the voltage of the gamma trace at temperature x, Vg(20) is the voltage of the gamma trace at temperature 20°, I is the current of the gamma trace, Rg is the resistance of the gamma trace, V1 is the reference voltage of the gamma voltage at temperature 20 degrees, and Vg1 is the adjusted gamma voltage.

4. The driving circuit according to claim 1, wherein: The driving circuit includes a gamma voltage detection circuit and a resistance adjustment circuit, the resistance adjustment circuit includes a resistor string formed by sequentially connecting a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor in series, and a switch group, the resistor string is connected in series on the gamma trace, the switch group includes a first switch group, a second switch group, a third switch group, and a fourth switch group, and the resistance adjustment circuit also includes a first transistor, a second transistor, a third transistor, and a fourth transistor; The input end of the first transistor is connected between the first resistor and the second resistor, the output end is connected to the output end of the fifth resistor, and the control end is connected to the output end of the switching signal through the first switch group; The input end of the second transistor is connected between the second resistor and the third resistor, the output end is connected to the output end of the fifth resistor, and the control end is connected to the output end of the switching signal through the second switch group; The input end of the third transistor is connected between the third resistor and the fourth resistor, the output end is connected to the output end of the fifth resistor, and the control end is connected to the output end of the switch signal through the third switch group; The input end of the fourth transistor is connected between the fourth resistor and the fifth resistor, the output end is connected to the output end of the fifth resistor, and the control end is connected to the output end of the switch signal through the fourth switch group; Wherein, each switch group includes two switch tubes connected in series, the first switch group includes a first switch tube and a second switch tube connected in series, the second switch group includes a third switch tube and a fourth switch tube connected in series, the third switch group includes a fifth switch tube and a sixth switch tube connected in series, and the fourth switch group includes a seventh switch tube and an eighth switch tube connected in series; the input ends of the first switch tube, the third switch tube, the fifth switch tube, and the seventh switch tube are connected to the output end of the switching signal, the output end of the second switch tube is connected to the control end of the first transistor, the output end of the fourth switch tube is connected to the control end of the second transistor, the output end of the sixth switch tube is connected to the control end of the third transistor, and the output end of the eighth switch tube is connected to the control end of the third transistor. The output end of the switch is connected to the control end of the fourth transistor, the control end of the first switch tube and the control end of the third switch tube receive a first control signal to be turned on or off, the control end of the second switch tube and the control end of the sixth switch tube receive a second control signal to be turned on or off, the control end of the fourth switch tube and the control end of the eighth switch tube receive a third control signal to be turned on or off, and the control end of the fifth switch tube and the control end of the seventh switch tube receive a fourth control signal to be turned on or off. The gamma voltage detection circuit detects the gamma voltage output to the data driving circuit, generates a corresponding control signal based on the detected gamma voltage to connect to the corresponding resistor, and generates a new gamma voltage to be output to the data driving circuit.

5. A driving method, characterized in that: Used to drive the driving circuit according to any one of claims 1 to 4, the driving method comprising: Obtaining a temperature value on a glass-based circuit board; and Different gamma voltages are output to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board. The data driving module generates corresponding grayscale signals and inputs them to the display panel.

6. The driving method according to claim 5, wherein: The driving circuit includes an analog-to-digital converter, and the temperature detection module includes a first high-precision resistor and a temperature resistor connected in series. One end of the analog-to-digital converter is connected to the first high-precision resistor, and the other end is connected to the timing control module. The first circuit board is also provided with a power chip, which is connected to the analog-to-digital converter via the first high-precision resistor. One end of the temperature resistor is connected to a first node between the first high-precision resistor and the analog-to-digital converter, and the other end is grounded. The step of obtaining the temperature value on the glass-based circuit board includes: The analog-to-digital converter obtains a voltage value of the first node, converts the voltage value into a binary value, and sends the binary value to the timing control module. The timing control module obtains a corresponding temperature value based on a first lookup table.

7. The driving method according to claim 5, wherein: The driving circuit includes an analog-to-digital converter, and the temperature detection module includes a first resistor and a temperature resistor connected in series. One end of the analog-to-digital converter is connected to the first resistor, and the other end is connected to the timing control module. The first circuit board is also provided with a power chip, which is connected to the analog-to-digital converter through the first resistor. One end of the temperature resistor is connected to a first node between the first resistor and the analog-to-digital converter, and the other end is grounded. The step of obtaining the temperature value on the glass-based circuit board includes: Calculating the length and width of the temperature resistor through software simulation, and obtaining the resistance value of the temperature resistor based on a first preset formula; and Obtaining a voltage value of the first node based on a second preset formula, converting the voltage value of the first node into a binary value and sending the binary value to the timing control module, recording a corresponding relationship between the binary value and the temperature, and reading the binary value provided by the analog-to-digital converter to obtain the temperature of the glass-based circuit board; The first preset formula is Rs = ρL / A, where ρ is the resistivity value, and the resistivity relationship at each temperature is ρT = ρ0 (1 + αT). ρT represents the resistivity value at temperature T, ρ0 represents the resistivity value at temperature 0°C, α represents the temperature coefficient of copper resistivity, L / A is a constant, A represents the cross-sectional area of the temperature resistor, and L represents the length of the temperature resistor. The second preset formula is Vs=VDD*Rs / (R1+Rs), where Vs is the voltage value of the first node, VDD is the voltage value output by the power chip, R1 is the resistance value of the first resistor, and Rs is the resistance value of the temperature resistor.

8. The driving method according to claim 5, wherein: The step of outputting different gamma voltages to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board, and the data driving module generating corresponding grayscale signals to input to the display panel includes: Outputting different gamma voltages according to the resistance of the gamma traces on the glass-based circuit board and the temperature value of the glass-based circuit board; Detect whether the output gamma voltage meets the preset requirements. If so, directly output it to the data driving module. If not, connect the series resistance adjustment circuit to adjust the gamma voltage, and output the adjusted gamma voltage to the data driving module.

9. The driving method according to claim 5, wherein: The timing control module includes a gamma voltage output control module, which outputs different gamma voltages to the data driving module according to the resistance of the gamma traces on the glass-based circuit board and the temperature of the glass-based circuit board, and the data driving module generates a corresponding grayscale signal and inputs it to the display panel. The steps include: The timing control module obtains the real-time temperature of the glass-based circuit board according to calculation, and compares the real-time temperature with the first preset temperature and the second preset temperature; If the temperature is lower than the first preset temperature, directly outputting the original gamma voltage to the data driving module; If the temperature is greater than the first preset temperature and less than the second preset temperature, generating a compensated gamma voltage to the data driving module according to the resistance of the gamma trace on the glass-based circuit board and the temperature value of the glass-based circuit board; and If the temperature is greater than the second preset temperature, no gamma voltage is output to the data driving module, and the power chip is controlled to be powered off at the same time.

10. A display device, characterized in that: The device comprises a driving circuit and a display panel according to any one of claims 1 to 4, wherein the driving circuit drives the display panel using a driving method according to any one of claims 5 to 9.

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