Driving circuit, driving method and display device

Abstract

The invention discloses a driving circuit, a driving method and a display device, the driving circuit comprises a time sequence control module, a driving signal adjusting module, a wiring resistance obtaining module and a data driving module, the driving signal adjusting module is arranged on a glass-based circuit board, receives a driving signal output by the time sequence control module and adjusts the driving signal, and the data driving module is arranged on the glass-based circuit board; the driving signal adjusting module comprises a signal wire and an impedance selection circuit; the routing resistance acquisition module acquires the resistance of the signal routing; and the impedance selection circuit selects a corresponding resistance based on the resistance of the signal wire to adjust the received driving signal, outputs the adjusted driving signal to the data driving module, generates a corresponding data driving signal and inputs the data driving signal to the display panel. According to the application, the resistance of the signal wire on the glass-based circuit board is acquired, and the corresponding resistance is matched based on the resistance of the signal wire, so that the driving signal is adjusted, the signal interference on the signal wire is reduced, and the integrity of signal transmission is ensured.

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, no radiation, and relatively low manufacturing cost. When the 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, the existing circuits for scanning gate lines often adopt G0A (Gate Driver on Array) design to integrate TFT (Thin Film Transistor) gate switch circuits on the array substrate of the display panel to form a scanning drive for the display panel; glass substrates are used as glass-based circuit boards, but the manufacturing of glass-based circuit boards is easily affected by factors such as factory manufacturing, machine parameters, personnel operation, material properties, uniformity of large glass panels, and production environment. Its uncontrollability is much higher than that of normal PCB boards, especially the impedance of the routing on the glass-based circuit board has a great influence on signal transmission in terms of high-frequency characteristics, resulting in extremely unstable 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 can reduce signal interference on a wiring and improve signal transmission.

[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 driving signal adjustment module, a routing resistance acquisition module and a data driving module: the timing control module is arranged on a first circuit board, and outputs a driving signal; the driving signal adjustment module is arranged on a second circuit board, and receives and adjusts the driving signal; the driving signal adjustment module includes a signal routing and an impedance selection circuit, and the signal routing is connected to the impedance selection circuit; the routing resistance acquisition module is arranged on the second circuit board, and acquires the resistance of the signal routing, and is connected to the impedance selection circuit; one end of the data driving module is connected to the impedance selection circuit, and the other end is connected to the display panel; wherein the second circuit board is a glass-based circuit board, and the impedance selection circuit includes at least two resistors and a control switch, and the impedance selection circuit selects a corresponding resistor based on the resistance of the signal routing to adjust the received driving signal, and outputs the adjusted driving signal to the data driving module, and generates a corresponding data driving signal to input to the display panel.

[0006] Optionally, the signal route includes a first differential signal route and a second differential signal route, the first differential signal route receives and outputs a first differential signal; the second differential signal route receives and outputs a second differential signal; the route resistance acquisition module includes a first control switch, a first route, a second control switch, and a second route, the control ends of the first control switch and the second control switch are respectively connected to a timing control module, and receive a control signal output by the timing control module to be turned on or off, the first route forms a first loop through the first control switch and the first differential signal route, the second route forms a second loop through the second control switch and the second differential signal route, the timing control module calculates the resistance of the first differential signal route based on the voltage on the first route and the first differential signal route, and calculates the resistance of the second differential signal route based on the voltage on the second route and the second differential signal route.

[0007] Optionally, the driving circuit includes a temperature detection module, the temperature detection module is used to detect the temperature of the signal routing, the temperature detection module is connected to the routing resistance acquisition module, and the temperature detection module calculates the resistance of the signal routing at the current temperature based on a first preset formula and a second preset formula to output to the routing resistance acquisition module; wherein the first preset formula is the relationship between the resistivity and temperature of the signal routing: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace; R = ρ(T)L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

[0008] Optionally, the impedance selection circuit includes a resistor string and a switch group, which are connected in series in sequence by a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the resistor string is connected in series on the signal routing line, the switch group includes a first switch group, a second switch group, a third switch group and a fourth switch group, and the impedance selection 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 switch 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 switch 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 switch 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 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 turn 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 turn 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 turn 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 turn on or off.

[0009] Optionally, the first control signal and the fourth control signal are a group of inverted signals, the second control signal and the third control signal are a group of inverted signals, and the first control signal and the second control signal are different control signals generated based on the resistance of the routing signal.

[0010] Optionally, the routing resistance acquisition module includes a signal routing resistance detection circuit, a resistance acquisition circuit, a temperature detection circuit and a switching circuit, the signal routing resistance detection circuit is used to detect the resistance of the signal routing, the temperature detection circuit detects and calculates the resistance of the signal routing at a preset temperature, the resistance acquisition circuit acquires the resistance of the signal routing detected by the signal routing resistance detection circuit or detects and calculates the resistance of the signal routing at a preset temperature by the temperature detection circuit, and the switching circuit controls the detection or calculation of the resistance of the signal routing by the signal routing resistance detection circuit or the temperature detection circuit based on the comparison result between the current temperature and the preset temperature.

[0011] The present application also discloses a driving method for driving any of the driving circuits described above, the driving method comprising: Generate a drive signal to output to the signal trace; Obtain the resistance of signal traces on glass-based circuit boards; The received driving signal is adjusted according to the resistance of the signal wiring matched with the corresponding resistance, and the adjusted driving signal is output to the data driving module to generate a corresponding data driving signal which is input to the display panel.

[0012] Optionally, the driving circuit includes a temperature detection module, and the step of obtaining the resistance of the signal trace on the glass-based circuit board includes: Detecting a current temperature of the signal trace, and calculating the resistance of the signal trace at the current temperature based on a first preset formula and a second preset formula; The first preset formula is the relationship between the resistivity and temperature of the signal trace: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace; R = ρ(T)L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

[0013] Optionally, the driving circuit includes a driving signal adjustment module, the driving signal adjustment module includes an impedance selection circuit, the impedance selection circuit includes a resistor string and a switch group, which are sequentially connected in series by a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the resistor string is connected in series on the signal line, the switch group includes a first switch group, a second switch group, a third switch group and a fourth switch group, and the impedance selection 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 switch 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 switch 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 switch 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 fourth transistor; the step of matching the corresponding resistance according to the resistance of the signal routing to adjust the received drive signal, and outputting the adjusted drive signal to the data driving module, generating the corresponding data drive signal and inputting it to the display panel includes: Generate a first control signal, a second control signal, a third control signal and a fourth control signal based on the resistance of the signal wiring, control the corresponding switch tube to be turned on to access the corresponding resistance according to the first control signal, the second control signal, the third control signal and the fourth control signal, and adjust the received drive signal; Among them, the first control signal is output to the control end of the first switch tube and the control end of the third switch tube to control the conduction or disconnection of the first switch tube and the third switch tube, the second control signal is output to the control end of the second switch tube and the control end of the sixth switch tube to control the conduction or disconnection of the second switch tube and the sixth switch tube, the third control signal is output to the control end of the fourth switch tube and the control end of the eighth switch tube to control the conduction or disconnection of the fourth switch tube and the eighth switch tube, and the fourth control signal is output to the control end of the fifth switch tube and the control end of the seventh switch tube to control the conduction or disconnection of the fifth switch tube and the seventh switch tube.

[0014] 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 a driving method as described above.

[0015] The present application uses a glass-based circuit board to reduce costs, and also sets a drive signal adjustment module and a wiring resistance acquisition module on the glass-based circuit board to obtain the resistance of the signal wiring, select a corresponding resistance based on the resistance of the signal wiring to adjust the received drive signal, and output the adjusted drive signal to the data drive module to generate a corresponding data drive signal that is input to the display panel, thereby reducing interference with the signal wiring on the glass-based circuit, ensuring the stability of signal transmission, and improving and enhancing the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 is a schematic diagram of the structure of a driving circuit of the first embodiment of the present application; Figure 2 is a structural schematic diagram of a wiring resistance acquisition module according to a second embodiment of the present application; Figure 3 is a schematic diagram of the structure of a driving circuit of a second embodiment of the present application; Figure 4 is a schematic diagram of the structure of a driving circuit of the third embodiment of the present application; Figure 5 is a schematic diagram of the structure of a driving circuit of a fourth embodiment of the present application; Figure 6 is a schematic flow chart of a driving method according to a fifth embodiment of the present application; Figure 7 is a schematic flow chart of a driving method according to a sixth embodiment of the present application; Figure 8 is a schematic flow chart of a driving method according to a seventh embodiment of the present application; Fig. 9 It is a schematic structural diagram of a display device of the eighth embodiment of the present application.

[0017] Among them, 100, driving circuit; 110, timing control module; 120, driving signal adjustment module; 121, signal routing; 1211, first differential signal routing; 1212, second differential signal routing; 122, impedance selection circuit; 123, resistor string; 124, switch group; 1241, first switch group; 1242, second switch group; 1243, third switch group; 1244, fourth switch group; 130, routing resistance acquisition module; 131, first control switch; 132, first routing; 133, second control switch; 134, second routing; 135, signal routing resistance detection circuit; 136, resistance acquisition circuit; 137, temperature detection circuit; 138, switching circuit; 14 0. data driving module; 150. first circuit board; 160. second circuit board; 170. temperature detection module; 200. display panel; 300. display device; R1. first resistor; R2. second 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. DETAILED DESCRIPTION

[0018] 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, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0019] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0020] refer to Figure 1As shown, as the first embodiment of the present application, a driving circuit 100 is disclosed, and the driving circuit 100 is used to drive the display panel 200 to display. The driving circuit 100 includes a timing control module 110, a driving signal adjustment module 120, a wiring resistance acquisition module 130 and a data driving module 140: the timing control module 110 is arranged on a first circuit board 150, and outputs a driving signal; the driving signal adjustment module 120 is arranged on a second circuit board 160, receives a driving signal and adjusts it, and the driving signal adjustment module 120 includes a signal wiring 121 and an impedance selection circuit 122, and the signal wiring 121 is connected to the impedance selection circuit 122; the wiring The resistance acquisition module 130 is arranged on the second circuit board 160, acquires the resistance of the signal line 121, and is connected to the impedance selection circuit 122; one end of the data driving module 140 is connected to the impedance selection circuit 122, and the other end is connected to the display panel 200; wherein, the second circuit board 160 is a glass-based circuit board, and the impedance selection circuit 122 includes at least two resistors and a control switch, and the impedance selection circuit 122 selects a corresponding resistor based on the resistance of the signal line 121 to adjust the received driving signal, and outputs the adjusted driving signal to the data driving module 140, and generates a corresponding data driving signal to be input to the display panel 200.

[0021] 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 wiring on the glass substrate is much greater than the impedance of the wiring on the normal PCB (more than 10 times the difference). For high-speed signals, the impedance of the signal wiring 121 will seriously affect signal transmission in high-frequency characteristics. For example, if the impedance of the differential signal wiring 121 cannot be controlled, signal loss will be caused, resulting in signal instability. Based on this, a driving signal adjustment module 120 and a wiring resistance acquisition module 130 are set on the glass-based circuit board to obtain the resistance of the signal wiring 121, select a corresponding resistance based on the resistance of the signal wiring 121, that is, match the corresponding external impedance to adjust the received driving signal, and output the adjusted driving signal to the data driving module 140, generate a corresponding data driving signal and input it into the display panel 200, thereby reducing the interference of the signal wiring 121 on the glass-based circuit, ensuring the stability of signal transmission, and improving and enhancing the display effect of the display panel 200.

[0022] refer to Figure 2 As shown in the second embodiment of the present application, it is a further refinement of the above first embodiment. Figures 2 to 3As shown, the signal routing 121 includes a first differential signal routing 1211 and a second differential signal routing 1212, and the two differential signal routings 121 are of equal length, equal width, close to each other and arranged at the same level; the first differential signal routing 1211 receives and outputs a first differential signal; the second differential signal routing 1212 receives and outputs a second differential signal; although the differential signal is very susceptible to interference from common-mode signals, the overly long return path and the impedance of the routing (more of the inductive reactance) cause distortion of the differential signal (the upper line edge becomes slower, there is overshoot or undershoot), resulting in recognition errors at the receiving end; for high-speed signals, the impedance of the routing has a great influence on signal transmission in terms of high-frequency characteristics, so in order to reduce excessive influence, short routing and short return paths are used for matching. High-frequency signals will be reflected at places where the impedance is discontinuous. Therefore, in order to prevent the reflected signal from being transmitted back and superimposed on the transmitted signal to cause interference, the present application is made according to different glasses, detects the routing resistance of different differential routing lines, and then adjusts the terminal matching resistance according to the actual routing resistance, so that the differential matching effect is optimized, the data driving module 140 receiving end can receive the complete signal, and the display is more stable.

[0023] Specifically, since it is impossible to determine the routing length and width rules of the front-end signal, the impedance of the signal routing 121 is an unknown value. At this time, a routing resistance acquisition module 130 is required to detect and acquire the resistance of the signal routing 121. After each glass substrate is made, the resistance of the signal routing 121 needs to be detected. The routing resistance acquisition module 130 includes a first control switch 131, a first routing 132, a second control switch 133, and a second routing 134. The control ends of the first control switch 131 and the second control switch 133 are respectively connected to the timing control module 110, and receive the control signal output by the timing control module 110 to turn on or off. The first routing line 132 forms a first loop through the first control switch 131 and the first differential signal routing line 1211, and the second routing line 134 forms a second loop through the second control switch 133 and the second differential signal routing line 1212. The timing control module 110 calculates the resistance of the first differential signal routing line 1211 based on the voltage on the first routing line 132 and the first differential signal routing line 1211, and calculates the resistance of the second differential signal routing line 1212 based on the voltage on the second routing line 134 and the second differential signal routing 1212. The first control switch 131 and the second control switch 133 can be ordinary transistors or MOS tubes.

[0024] The first trace 132 is VNO, and the second trace 134 is VPO, which are used for resistance detection. VNI and VPI are the paths for the differential signal trace 121 to normally transmit signals. The timing control module 110 outputs a control signal for opening two I / O line control switches. The traces of VNO and VPO need to be the same length as those of VNI and VPI, and they should be close together, so that their characteristics on the glass PCB are similar. When the first light is turned on after the output, the control signal is turned on, VNO and VNI as well as VPO and VPI form a complete loop, and the constant current source is used to provide the current of the entire loop. The current flows as shown by the arrow direction, from VNI to VNO, so for the voltages VA and VB connected to the constant current source I, the VB voltage is greater than the VA voltage; the collected voltage is processed by the timing control module 110, so that (VB-VA) / I or (VC-VD) / I, the resistance R of the entire loop can be obtained, and because the two paths of VNO and VNI are almost the same, the wiring resistance R1 from VNI to the data driving module 140 end and the resistance R2 of VPI can be obtained; after the confirmation is completed, there is no need to perform the detection selection action later, because after the glass PCB is manufactured, the process characteristics of the copper wiring do not change much over time, so you only need to select the solution at the beginning to achieve the best effect, which will not occupy the subsequent working time of the glass base as a PCB.

[0025] Furthermore, the impedance selection circuit 122 includes a resistor string 123 and a switch group 124, which are connected in series in sequence 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 123 is connected in series on the signal wiring 121. The switch group 124 includes a first switch group 1241, a second switch group 1242, a third switch group 1243 and a fourth switch group 1244. The impedance selection circuit 122 also includes a first transistor T1, a second transistor T2, a third transistor T3 and a fourth transistor T4, which may be four switch tubes of other types. The input end of the first transistor T1 is connected between the first resistor R1 and the second resistor R2, and the output end is connected to the output end of the fifth resistor R5. , the control end is connected to the output end of the switch signal through the first switch group 1241; 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 switch signal through the second switch group 1242; 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 switch signal through the third switch group 1243; 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 switch signal through the fourth switch group 1244.

[0026] Each switch group 124 includes two switch tubes connected in series, the first switch group 1241 includes a first switch tube S1 and a second switch tube S2 connected in series, the second switch group 1242 includes a third switch tube S3 and a fourth switch tube S4 connected in series, the third switch group 1243 includes a fifth switch tube S5 and a sixth switch tube S6 connected in series, and the fourth switch group 1244 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 switch 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, and the output end of the eighth switch tube S8 is connected to the control end of the third transistor T3. The output end of the switch S8 is connected to the control end of the fourth transistor T4, the control end of the first switch S1 and the control end of the third switch S3 receive the first control signal b1 to turn on or off, the control end of the second switch S2 and the control end of the sixth switch S6 receive the second control signal b2 to turn on or off, the control end of the fourth switch S4 and the control end of the eighth switch S8 receive the third control signal b3 to turn on or off, and the control end of the fifth switch S5 and the control end of the seventh switch S7 receive the fourth control signal b4 to turn on or off; 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.

[0027] An impedance selection circuit 122 is designed on the glass PCB. Because there are no components on the glass substrate, the resistance here is simulated by the ITO (transparent thin film electrode) routing on the glass substrate. However, due to process problems, the resistance this time may not be accurate. In this way, a similar resistance detection module can be used to determine the specific resistance of the reserved resistor, which is not introduced in detail here. Assume that the preset resistance values ​​of resistors R1 to R5 are uniform and are all 10 ohms (more resistance options can also be reserved). When the routing resistance acquisition module 130 confirms, the impedance of the differential routing can be confirmed. The timing control module 110 will give a control signal and a switch signal to select the matching resistor connected in series between VNI and VPI. The closer the matching resistor is to the receiving end, the better the matching effect. The control signal can be used to select the value of the resistor in series. For example, if b2b3 is 11, S5 and S6 are turned on, the corresponding paths are connected, and the control signal is input to T3 through S5 and S6 to turn on 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 different matching resistors can be selected according to the differences in the manufacturing of different glass substrates.

[0028] refer to Figure 4 As shown, as the third embodiment of the present application, it is a further refinement of any of the above embodiments, the driving circuit 100 includes a temperature detection module 170, the temperature detection module 170 is used to detect the temperature of the signal wiring 121, the temperature detection module 170 is connected to the wiring resistance acquisition module 130, the temperature detection module 170 calculates the resistance of the signal wiring 121 at the current temperature based on the first preset formula and the second preset formula to output to the wiring resistance acquisition module 130; The first preset formula is the relationship between the resistivity and temperature of the signal trace 121: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace 121; R = ρ(T)L / A; Wherein, A is the cross-sectional area of ​​the signal line 121 , and L is the length of the signal line 121 .

[0029] Generally, a glass-based PCB, i.e., a glass-based circuit board, is installed on a backplane. The backplane will generate heat due to the presence of lamp beads and light strips, and the ambient temperature will also change. Therefore, the influence of temperature on the traces on the glass-based PCB cannot be ignored. Because VNI is a normal differential signal trace 121 during the operation of the circuit, the resistance of this trace cannot be detected in real time through the detection module during the operation of the circuit. If a separate trace resistance is detected, it will cause signal reflection and interfere with the integrity of the transmission signal. Therefore, a temperature detection module 170 is set to detect the temperature of the trace, thereby converting the real-time trace resistance and selecting the corresponding matching resistance. Implementation plan: Different matching resistors are called at different temperatures. The resistivity ρ at each temperature is stored in the timing control module 110. When the working temperature is fed back to the timing control module 110, the timing control module 110 calls the corresponding calculation formula. Through R=ρL / A, the value of R1 can be obtained according to 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, according to the resistance value of 25 degrees at room temperature, R1=ρ25*L / A→L / A=R1 / ρ25→R(T)=ρ(T)*L / A=ρ(T )*(R1 / ρ25),L / AThe same glass PCB will not change with temperature and time, only ρ will change with temperature. In this way, we can get the formula for how the resistance of each glass substrate changes with temperature. After getting the resistance, we can call different resistors 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.

[0030] like Figure 5 As shown, as the fourth embodiment of the present application, which is also a further improvement on the first embodiment, the wiring resistance acquisition module 130 is different from the above-mentioned second embodiment and third embodiment in that the wiring resistance acquisition module 130 includes a signal wiring resistance detection circuit 135, a resistance acquisition circuit 136, a temperature detection circuit 137 and a switching circuit 138. The signal wiring resistance detection circuit 135 is used to detect the resistance of the signal wiring 121, and the temperature detection circuit 137 detects and calculates the resistance of the signal wiring 121 at a preset temperature. The resistance acquisition circuit 136 acquires the resistance of the signal wiring 121 detected by the signal wiring resistance detection circuit 135 or the resistance of the signal wiring 121 detected and calculated by the temperature detection circuit 137 at a preset temperature. The switching circuit 138 controls the signal wiring resistance detection circuit 135 or the temperature detection circuit 137 to detect or calculate the resistance of the signal wiring 121 based on the comparison result between the current temperature and the preset temperature.

[0031] In this embodiment, the signal line resistance detection circuit 135 detects the resistance of the signal line 121 within a preset temperature range, and as long as it is within the preset temperature range, the resistance detected by the signal line resistance detection circuit 135 is used to select the corresponding resistance in the impedance selection circuit 122. When the preset temperature is exceeded, the temperature detection circuit 137 detects and calculates the resistance of the signal line 121 at the preset temperature, and the switching circuit 138 also turns off the signal line resistance detection circuit 135. The signal line resistance detection circuit 135 no longer detects the resistance of the signal line 121, and directly detects and calculates the resistance of the signal line 121 at the preset temperature through the temperature detection circuit 137, and feeds back the detected and calculated resistance of the signal line 121 to the impedance selection circuit 122, thereby selecting the corresponding matching resistance to achieve stable transmission of the differential signal and improve the display effect.

[0032] like Figure 6 As shown, as a fifth embodiment of the present application, a driving method is disclosed, the driving method is used to drive the driving circuit 100 as described in any of the above embodiments, the driving method comprising: S1: Generates a drive signal to output to the signal trace; S2: Obtain the resistance of the signal trace on the glass-based circuit board; and S3: adjusting the received driving signal by matching the resistance of the signal wiring with the corresponding resistance, and outputting the adjusted driving signal to the data driving module to generate a corresponding data driving signal to be input to the display panel.

[0033] In the present application, in order to reduce costs, glass is used as a PCB board, so the signal lines 121 are all arranged on the glass-based circuit board. Because the differential signal lines 121 are arranged on the glass-based circuit board, the impedance is greater than the impedance on the ordinary circuit board. In order to avoid the impedance causing unstable signal transmission, an external impedance is set for matching. By obtaining the resistance of the signal line 121 on the glass-based circuit board, the corresponding resistance is matched according to the resistance of the signal line 121 to adjust the received drive signal, and the adjusted drive signal is output to the data drive module 140, and the corresponding data drive signal is generated and input to the display panel 200, thereby reducing the interference of the signal line 121 on the glass-based circuit board, ensuring the stability of signal transmission, and improving and enhancing the display effect of the display panel 200.

[0034] like Figure 7 As shown, as the sixth embodiment of the present application, it is a further refinement and improvement of the fifth embodiment. The driving circuit 100 includes a temperature detection module 170, and the step S2 includes: S21: Detecting the current temperature of the signal trace, and calculating the resistance of the signal trace at the current temperature based on the first preset formula and the second preset formula; The first preset formula is the relationship between the resistivity and temperature of the signal trace 121: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace 121; R = ρ (T) L / ; Wherein, A is the cross-sectional area of ​​the signal line 121 , and L is the length of the signal line 121 .

[0035] Generally, the timing control module 110 internally stores the resistivity ρ of the signal trace 121 at various temperatures. When the glass-based circuit board is working, the temperature of the signal trace 121 is detected and fed back to the timing control module 110. The timing control module 110 calls the corresponding calculation formula, through R=ρL / A, the value of R1 can be obtained according to the resistance detection before leaving the factory. Because ρ is the resistivity, a linear change value and the change rule of all glass substrates is the same, so according to the resistance value of 25 degrees at room temperature, R1=ρ25*L / A→L / A=R1 / ρ25→R(T)=ρ(T)*L / A=ρ(T)*(R1 / ρ25) can be obtained. L / A of the same glass PCB 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 substrate with temperature can be obtained. After obtaining the resistance, different resistors can be called for matching.

[0036] like Figure 8 As shown, as the seventh embodiment of the present application, it is a further refinement and improvement of the fifth embodiment mentioned above, referring to Figure 3 and Figure 8As shown, the driving circuit 100 includes a driving signal adjustment module 120, and the driving signal adjustment module 120 includes an impedance selection circuit 122. The impedance selection circuit 122 includes a resistor string 123 and a switch group 124, 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 123 is connected in series on the signal line 121. The switch group 124 includes a first switch group 1241, a second switch group 1242, a third switch group 1243 and a fourth switch group 1244. The impedance selection circuit 122 also includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4 and a fifth transistor T5. The first transistor T1 has an input end connected between the first resistor R1 and the second resistor R2, an output end connected to the output end of the fifth resistor R5, and a control end connected to the output end of the switch signal through a first switch group 1241; the second transistor T2 has an input end connected between the second resistor R2 and the third resistor R3, an output end connected to the output end of the fifth resistor R5, and a control end connected to the output end of the switch signal through a second switch group 1242; the third transistor T3 has an input end connected between the third resistor R3 and the fourth resistor R4, and an output end connected to the output end of the fifth resistor R5. At the output end of the fifth resistor R5, the control end is connected to the output end of the switch signal through the third switch group 1243; 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 switch signal through the fourth switch group 1244; wherein each switch group 124 includes two switch tubes connected in series, the first switch group 1241 includes a first switch tube S1 and a second switch tube S2 connected in series, the second switch group 1242 includes a third switch tube S3 and a fourth switch tube S4 connected in series, and the third switch group 1 243 includes a fifth switch tube S5 and a sixth switch tube S6 connected in series, and the fourth switch group 1244 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 switch 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, and the output end of the eighth switch tube S8 is connected to the control end of the fourth transistor T4.

[0037] The step S3 comprises: S31: generating a first control signal, a second control signal, a third control signal and a fourth control signal based on the resistance of the signal line, controlling the corresponding switch tube to be turned on to connect the corresponding resistor according to the first control signal, the second control signal, the third control signal and the fourth control signal, and adjusting the received drive signal; Among them, 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, 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 S6 to control the conduction or disconnection of the second switch tube S2 and the sixth switch tube S6, the third control signal b3 is output to the control end of the fourth switch tube S4 and the control end of the eighth switch tube S8 to control the conduction or disconnection of the fourth switch tube S4 and the eighth switch tube S8, and the fourth control signal b4 is output to the control end of the fifth switch tube S5 and the control end of the seventh switch tube S7 to control the conduction or disconnection of the fifth switch tube S5 and the seventh switch tube S7. The resistance of the signal wiring 121 is actually detected or calculated, and then the external impedance is matched based on the circuit of the signal wiring 121, that is, different resistors are connected to ensure the stability of differential signal transmission.

[0038] like Fig. 9 As shown, as the eighth embodiment of the present application, a display device 300 is disclosed, wherein the display device 300 includes a driving circuit 100 and a display panel 200 as described in any of the above embodiments, and the driving circuit 100 drives the display panel 200 using the driving method in the above embodiments.

[0039] refer to Figures 1 to 5 As shown, the present application uses a glass substrate as a glass-based circuit board for laying out wiring, and adjusts the drive signal pre-input to the display panel by detecting the resistance of the signal wiring on the glass-based circuit according to the signal wiring resistance detection circuit 135 or calculating the resistance of the signal wiring on the glass-based circuit board based on the measured temperature value, thereby ensuring the stability of signal transmission on the signal wiring and improving the display effect of the display panel.

[0040] It should be noted that the limitations of the various steps involved in this scheme, without affecting the implementation of the specific scheme, are not considered to limit the order of the steps, that is, the steps written in front can be executed first, or can be executed later, or even simultaneously. As long as this scheme can be implemented, it should be considered to belong to the scope of protection of this application. The inventive concept of this application can form a lot of embodiments, but the length of the application document is limited and cannot be listed one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form a new embodiment. After the various embodiments or technical features are combined, the original technical effect will be enhanced.

[0041] The above contents are further detailed descriptions of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is 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 deemed to fall within the scope of protection of the present application.

Claims

1. A driving circuit, the driving circuit is used to drive a display panel to display, characterized in that: The driving circuit comprises: A timing control module is arranged on the first circuit board and outputs a driving signal; A drive signal adjustment module is arranged on the second circuit board, receives the drive signal and makes adjustments, the drive signal adjustment module comprises a signal line and an impedance selection circuit, and the signal line is connected to the impedance selection circuit; A wiring resistance acquisition module is provided on the second circuit board, acquires the resistance of the signal wiring, and is connected to the impedance selection circuit; A data driving module, one end of which is connected to the impedance selection circuit, and the other end of which is connected to the display panel; Among them, the second circuit board is a glass-based circuit board, and the impedance selection circuit includes at least two resistors and a control switch. The impedance selection circuit selects a corresponding resistor based on the resistance of the signal line to adjust the received drive signal, and outputs the adjusted drive signal to the data drive module to generate a corresponding data drive signal to input into the display panel.

2. The driving circuit according to claim 1, characterized in that: The signal routing includes: A first differential signal routing line receives and outputs a first differential signal; A second differential signal routing line receives and outputs a second differential signal; The routing resistance acquisition module includes a first control switch, a first routing, a second control switch and a second routing. The control ends of the first control switch and the second control switch are respectively connected to the timing control module, and receive the control signal output by the timing control module to be turned on or off. The first routing forms a first loop through the first control switch and the first differential signal routing, and the second routing forms a second loop through the second control switch and the second differential signal routing. The timing control module calculates the resistance of the first differential signal routing based on the voltage on the first routing and the first differential signal routing, and calculates the resistance of the second differential signal routing based on the voltage on the second routing and the second differential signal routing.

3. The driving circuit according to claim 1, wherein: The driving circuit includes a temperature detection module, the temperature detection module is used to detect the temperature of the signal wiring, the temperature detection module is connected to the wiring resistance acquisition module, the temperature detection module calculates the resistance of the signal wiring at the current temperature based on the first preset formula and the second preset formula to output to the wiring resistance acquisition module; The first preset formula is the relationship between the resistivity and temperature of the signal trace: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace; R = ρ(T)L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

4. The driving circuit according to any one of claims 1 to 3, characterized in that: The impedance selection circuit includes a resistor string and a switch group, which are sequentially connected in series by a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the resistor string is connected in series on the signal line, the switch group includes a first switch group, a second switch group, a third switch group and a fourth switch group, and the impedance selection 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 switch 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 switch 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; 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 switch 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 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 turn 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 turn 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 turn 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 turn on or off.

5. The driving circuit according to claim 4, characterized in that: The first control signal and the fourth control signal are a group of inverted signals, the second control signal and the third control signal are a group of inverted signals, and the first control signal and the second control signal are different control signals generated based on the resistance of the routing signal.

6. The driving circuit according to claim 1, characterized in that: The routing resistance acquisition module includes a signal routing resistance detection circuit, a resistance acquisition circuit, a temperature detection circuit and a switching circuit. The signal routing resistance detection circuit is used to detect the resistance of the signal routing. The temperature detection circuit detects and calculates the resistance of the signal routing at a preset temperature. The resistance acquisition circuit acquires the resistance of the signal routing detected by the signal routing resistance detection circuit or the resistance of the signal routing detected and calculated by the temperature detection circuit at a preset temperature. The switching circuit controls the detection or calculation of the resistance of the signal routing by the signal routing resistance detection circuit or the temperature detection circuit based on the comparison result between the current temperature and the preset temperature.

7. A driving method, characterized in that: Used to drive the driving circuit according to any one of claims 1 to 6, the driving method comprising: Generate a drive signal to output to the signal trace; Obtain the resistance of signal traces on glass-based circuit boards; The received driving signal is adjusted according to the resistance of the signal wiring matched with the corresponding resistance, and the adjusted driving signal is output to the data driving module to generate a corresponding data driving signal which is input to the display panel.

8. The driving method according to claim 7, characterized in that: The driving circuit includes a temperature detection module, and the step of obtaining the resistance of the signal trace on the glass-based circuit board includes: Detecting a current temperature of the signal trace, and calculating the resistance of the signal trace at the current temperature based on a first preset formula and a second preset formula; The first preset formula is the relationship between the resistivity and temperature of the signal trace: Ρ(T)=ρ(0)*(1+αT); Among them, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0℃, and α represents the temperature coefficient of copper resistivity; The second preset formula is the relationship between the resistance and resistivity of the signal trace; R = ρ(T)L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

9. The driving method according to claim 7, characterized in that: The driving circuit includes a driving signal adjustment module, the driving signal adjustment module includes an impedance selection circuit, the impedance selection circuit includes a resistor string and a switch group, which are sequentially connected in series by a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the resistor string is connected in series on the signal line, the switch group includes a first switch group, a second switch group, a third switch group and a fourth switch group, and the impedance selection 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 switch 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 switch 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 switch 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 fourth transistor; the step of matching the corresponding resistance according to the resistance of the signal routing to adjust the received drive signal, and outputting the adjusted drive signal to the data driving module, generating the corresponding data drive signal and inputting it to the display panel includes: Generate a first control signal, a second control signal, a third control signal and a fourth control signal based on the resistance of the signal wiring, control the corresponding switch tube to be turned on to access the corresponding resistance according to the first control signal, the second control signal, the third control signal and the fourth control signal, and adjust the received drive signal; Among them, the first control signal is output to the control end of the first switch tube and the control end of the third switch tube to control the conduction or disconnection of the first switch tube and the third switch tube, the second control signal is output to the control end of the second switch tube and the control end of the sixth switch tube to control the conduction or disconnection of the second switch tube and the sixth switch tube, the third control signal is output to the control end of the fourth switch tube and the control end of the eighth switch tube to control the conduction or disconnection of the fourth switch tube and the eighth switch tube, and the fourth control signal is output to the control end of the fifth switch tube and the control end of the seventh switch tube to control the conduction or disconnection of the fifth switch tube and the seventh switch tube.

10. A display device, characterized in that: It comprises a driving circuit and a display panel as described in any one of claims 1 to 6, wherein the driving circuit drives the display panel using a driving method as described in any one of claims 7 to 9.

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