Driving circuit, driving method and display device

Abstract

The present application discloses a drive circuit, a drive method, and a display device. The drive circuit includes a timing control module, a drive signal adjustment module, a trace resistance acquisition module, and a data drive module. The drive signal adjustment module is disposed on a glass-based circuit board and receives and adjusts the drive signal output by the timing control module. The drive signal adjustment module includes a signal trace and an impedance selection circuit. The trace resistance acquisition module acquires the resistance of the signal trace. The impedance selection circuit selects a corresponding resistor based on the resistance of the signal trace to adjust the received drive signal, and outputs the adjusted drive signal to the data drive module, generating a corresponding data drive signal that is input to the display panel. The present application acquires the resistance of the signal trace on the glass-based circuit board and matches the corresponding resistor based on the resistance of the signal trace to adjust the drive signal, thereby reducing signal interference on the signal trace and ensuring the integrity of signal transmission.

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 impedance of the traces on the glass-based circuit board has a significant impact on signal transmission at high frequencies, 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 to output a driving signal; the driving signal adjustment module is arranged on a second circuit board to receive and adjust 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 to acquire 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, 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 routing to adjust the received driving signal, and outputs the adjusted driving signal to the data driving module, generating a corresponding data driving signal to input into 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 the timing control module, and receive the control signal output by the timing control module to turn on or off, the first route forms a first loop through the first control switch and the first differential signal route, and 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, which is used to detect the temperature of the signal trace. The temperature detection module is connected to the trace resistance acquisition module. The temperature detection module calculates the resistance of the signal trace at the current temperature based on a first preset formula and a second preset formula and outputs the calculated value to the trace resistance acquisition module. The first preset formula is the relationship between the resistivity and temperature of the signal trace:

[0008] Ρ(T)=ρ(0)*(1+αT);

[0009] Where, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity;

[0010] The second preset formula is the relationship between the resistance and resistivity of the signal trace;

[0011] R = ρ (T) L / A;

[0012] Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

[0013] Optionally, the impedance selection circuit includes a resistor string and a switch group consisting of a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor connected in series in sequence, 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 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 switching 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 switching 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. The fourth switch group includes a seventh switch tube and an eighth switch tube connected in series. The input terminals of the first, third, fifth, and seventh switch tubes are connected to the output terminal of the switching signal. The output terminal of the second switch tube is connected to the control terminal of the first transistor. The output terminal of the fourth switch tube is connected to the control terminal of the second transistor. The output terminal of the sixth switch tube is connected to the control terminal of the third transistor. The output terminal of the eighth switch tube is connected to the control terminal of the fourth transistor. The control terminals of the first and third switch tubes receive a first control signal to turn on or off. The control terminals of the second and sixth switch tubes receive a second control signal to turn on or off. The control terminals of the fourth and eighth switch tubes receive a third control signal to turn on or off. The control terminals of the fifth and seventh switch tubes receive a fourth control signal to turn on or off.

[0014] 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.

[0015] Optionally, the trace resistance acquisition module includes a signal trace resistance detection circuit, a resistance acquisition circuit, a temperature detection circuit and a switching circuit. The signal trace resistance detection circuit is used to detect the resistance of the signal trace, the temperature detection circuit detects and calculates the resistance of the signal trace at a preset temperature, the resistance acquisition circuit acquires the resistance of the signal trace detected by the signal trace resistance detection circuit or the resistance of the signal trace detected and calculated by the temperature detection circuit at a preset temperature, and the switching circuit controls the detection or calculation of the resistance of the signal trace by the signal trace resistance detection circuit or the temperature detection circuit based on the comparison result between the current temperature and the preset temperature.

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

[0017] Generate drive signals to output to signal traces;

[0018] Obtain the resistance of signal traces on glass-based circuit boards;

[0019] 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.

[0020] 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:

[0021] 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;

[0022] The first preset formula is the relationship between the resistivity and temperature of the signal trace:

[0023] Ρ(T)=ρ(0)*(1+αT);

[0024] Where, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity;

[0025] The second preset formula is the relationship between the resistance and resistivity of the signal trace;

[0026] R = ρ (T) L / A;

[0027] Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

[0028] Optionally, the drive circuit includes a drive signal adjustment module, the drive signal adjustment module includes an impedance selection circuit, the impedance selection circuit includes 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 is connected in series on the signal trace, 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 further includes a first transistor, a second transistor, a third transistor, and a fourth transistor;

[0029] 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;

[0030] 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;

[0031] 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;

[0032] 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;

[0033] 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 fourth transistor; the step of matching the resistance of the signal routing to the corresponding resistance to adjust the received drive signal, and outputting the adjusted drive signal to the data driving module to generate the corresponding data drive signal and input it to the display panel includes:

[0034] 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 trace, controlling corresponding switch tubes to conduct to connect corresponding resistors 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;

[0035] Among them, the first control signal is output to the control end of the first switching tube and the control end of the third switching tube to control the conduction or disconnection of the first switching tube and the third switching tube, the second control signal is output to the control end of the second switching tube and the control end of the sixth switching tube to control the conduction or disconnection of the second switching tube and the sixth switching tube, the third control signal is output to the control end of the fourth switching tube and the control end of the eighth switching tube to control the conduction or disconnection of the fourth switching tube and the eighth switching tube, and the fourth control signal is output to the control end of the fifth switching tube and the control end of the seventh switching tube to control the conduction or disconnection of the fifth switching tube and the seventh switching tube.

[0036] 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.

[0037] While the present application uses a glass-based circuit board to reduce costs, a drive signal adjustment module and a trace resistance acquisition module are also set on the glass-based circuit board to obtain the resistance of the signal trace, select a corresponding resistor based on the resistance of the signal trace 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 trace 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

[0038] 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 of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0039] Figure 1 is a schematic structural diagram of a driving circuit according to a first embodiment of the present application;

[0040] Figure 2 is a structural diagram of a trace resistance acquisition module according to a second embodiment of the present application;

[0041] Figure 3is a schematic structural diagram of a driving circuit according to a second embodiment of the present application;

[0042] Figure 4 1 is a schematic structural diagram of a driving circuit according to a third embodiment of the present application;

[0043] Figure 5 1 is a schematic structural diagram of a driving circuit according to a fourth embodiment of the present application;

[0044] Figure 6 is a flowchart of a driving method according to a fifth embodiment of the present application;

[0045] Figure 7 is a flowchart of a driving method according to a sixth embodiment of the present application;

[0046] Figure 8 is a flowchart of a driving method according to a seventh embodiment of the present application;

[0047] Figure 9 It is a structural schematic diagram of the display device of the eighth embodiment of the present application.

[0048] 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

[0049] 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.

[0050] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0051] 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 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, and receives and adjusts the driving signal; the driving signal adjustment module 120 includes a signal wiring 121 and an impedance selection circuit 122, the signal wiring 121 is connected to the impedance selection circuit 122; the wiring The resistance acquisition module 130 is set on the second circuit board 160, obtains the resistance of the signal trace 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. The impedance selection circuit 122 selects a corresponding resistor based on the resistance of the signal trace 121 to adjust the received drive signal, and outputs the adjusted drive signal to the data driving module 140, generating a corresponding data drive signal to input into the display panel 200.

[0052] In this embodiment, a glass substrate is used as a PCB, i.e., a glass-based circuit board, which can reduce costs. Due to the difference in impedance between glass and a normal PCB, the impedance of traces on a glass substrate is much greater than that of traces on a normal PCB (a difference of more than 10 times). For high-speed signals, the impedance of the signal trace 121 can seriously affect signal transmission at high frequencies. For example, if the impedance of the differential signal trace 121 cannot be controlled, signal loss and instability will occur. Therefore, a drive signal adjustment module 120 and a trace resistance acquisition module 130 are provided on the glass-based circuit board to acquire the resistance of the signal trace 121. Based on the resistance of the signal trace 121, a corresponding resistor is selected to match the corresponding external impedance to adjust the received drive signal. The adjusted drive signal is then output to the data drive module 140, which generates a corresponding data drive signal and inputs it into the display panel 200. This reduces interference with the signal trace 121 on the glass-based circuit board, ensures stable signal transmission, and improves and enhances the display effect of the display panel 200.

[0053] 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 3 As shown, the signal trace 121 includes a first differential signal trace 1211 and a second differential signal trace 1212. The two differential signal traces 121 are of equal length, equal width, close together, and arranged on the same layer. The first differential signal trace 1211 receives and outputs a first differential signal. The second differential signal trace 1212 receives and outputs a second differential signal. Although differential signals are susceptible to interference from common-mode signals, the long return path and the impedance of the trace (more of an inductive reactance) cause distortion of the differential signal (slowing down the upper edge, overshoot or undershoot), resulting in recognition errors at the receiving end. For high-speed signals, the impedance of the trace greatly affects signal transmission in terms of high-frequency characteristics. Therefore, in order to reduce excessive influence, short traces 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, this 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.

[0054] Specifically, since it is impossible to determine the length and width rules of the front-end signal routing, the impedance of the signal routing 121 is an unknown value. At this time, a routing resistance acquisition module 130 is required to detect 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 voltages 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 voltages 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 transistors.

[0055] The first trace 132 is VNO, and the second trace 134 is VPO, which are used for resistance detection. VNI and VPI are the normal signal transmission paths of the differential signal trace 121. The timing control module 110 outputs a control signal for turning on the two control switches connected to the I / O lines. The traces of VNO and VPO must be the same length as VNI and VPI and must be closely adjacent to each other so that their characteristics on the glass PCB are similar. When the light is first turned on after production, the control signal is turned on, and VNO, VNI, VPO, and VPI form a complete loop. A constant current source provides current for the entire loop. The current flows as shown by the arrow, from VNI to VNO. Therefore, for the voltages VA and VB at the two points connected to the constant current source I, VB > VA. The collected voltages are processed by the timing control module 110 so that (VB - VA) / I or (VC - VD) / I, and the resistance R of the entire loop can be obtained. Because the paths of VNO and VNI are almost identical, the trace resistance R1 from VNI to the data driver module 140 and the resistance R2 of VPI can be obtained. After confirmation, no further detection and selection steps are required. Because the process characteristics of the copper traces do not vary much over time after the glass PCB is manufactured, a simple initial selection is required to achieve the best results, without sacrificing the subsequent working time of the glass substrate as a PCB.

[0056] 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 trace 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. Of course, they can also 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 switching 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 switching 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 switching 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 switching signal through the fourth switch group 1244.

[0057] 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. 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 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 S1 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 a 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 a 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 a third control signal b3 to turn on or off. The control end of the fifth switch S5 and the control end of the seventh switch S7 receive a 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 generated based on the resistance of the routing signal.

[0058] 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) traces on the glass substrate. However, due to process issues, the resistance may not be accurate. In this case, a similar resistance detection module can be used to determine the specific resistance value of the reserved resistor, which will not be described in detail here. Assume that the preset resistance values ​​of resistors R1 to R5 are uniform and all 10 ohms (more resistance value options can also be reserved). After the trace resistance acquisition module 130 confirms, the impedance of the differential trace can be confirmed. The timing control module 110 will provide a control signal and a switch signal for selecting 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 resistance of the series resistor. For example, if b2b3 is 11, then S5 and S6 are open, connecting the corresponding paths. The control signal is input to T3 through S5 and S6, turning T3 on. Other paths are closed, and the switch signal is high. At this time, the selected resistance is R1+R2+R3=30 ohms. For more precise selection, multiple resistors can be set to reserve and different matching resistors can be selected based on the differences in the previous manufacturing of different glass substrates.

[0059] refer to Figure 4 As shown, as a third embodiment of the present application, which is a further refinement of any of the above embodiments, the driving circuit 100 includes a temperature detection module 170, which is used to detect the temperature of the signal trace 121. The temperature detection module 170 is connected to the trace resistance acquisition module 130. The temperature detection module 170 calculates the resistance of the signal trace 121 at the current temperature based on the first preset formula and the second preset formula, and outputs the calculated resistance to the trace resistance acquisition module 130.

[0060] The first preset formula is the relationship between the resistivity and temperature of the signal trace 121:

[0061] Ρ(T)=ρ(0)*(1+αT);

[0062] Where, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity;

[0063] The second preset formula is the relationship between the resistance and resistivity of the signal trace 121;

[0064] R = ρ (T) L / A;

[0065] Wherein, A is the cross-sectional area of ​​the signal trace 121 , and L is the length of the signal trace 121 .

[0066] Generally, a glass-based PCB, i.e., a glass-based circuit board, is mounted on a backplane. The backplane will generate heat due to the presence of light 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 circuit operation, the resistance of this trace cannot be detected in real time through the detection module during circuit operation. Moreover, 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 provided to detect the temperature of the trace, thereby converting the real-time trace resistance and selecting the corresponding matching resistor. Implementation plan:

[0067] Different matching resistors are called at different temperatures. The resistivity ρ at each temperature is stored internally 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 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, according to the resistance value at room temperature of 25 degrees, 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 obtaining 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.

[0068] like Figure 5As shown, as the fourth embodiment of the present application, which is also a further improvement of the first embodiment, the difference from the above-mentioned second and third embodiments is that the trace resistance acquisition module 130 includes a signal trace resistance detection circuit 135, a resistance acquisition circuit 136, a temperature detection circuit 137 and a switching circuit 138. The signal trace resistance detection circuit 135 is used to detect the resistance of the signal trace 121, and the temperature detection circuit 137 detects and calculates the resistance of the signal trace 121 at a preset temperature. The resistance acquisition circuit 136 acquires the resistance of the signal trace 121 detected by the signal trace resistance detection circuit 135 or the resistance of the signal trace 121 detected and calculated by the temperature detection circuit 137 at a preset temperature. The switching circuit 138 controls the signal trace resistance detection circuit 135 or the temperature detection circuit 137 to detect or calculate the resistance of the signal trace 121 based on the comparison result between the current temperature and the preset temperature.

[0069] In this embodiment, the signal trace resistance detection circuit 135 detects the resistance of the signal trace 121 within a preset temperature range. As long as it is within the preset temperature range, the resistance detected by the signal trace 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 trace 121 at the preset temperature. The switching circuit 138 also turns off the signal trace resistance detection circuit 135. The signal trace resistance detection circuit 135 no longer detects the resistance of the signal trace 121, but directly detects and calculates the resistance of the signal trace 121 at the preset temperature through the temperature detection circuit 137, and feeds back the detected and calculated resistance of the signal trace 121 to the impedance selection circuit 122, thereby selecting the corresponding matching resistor to achieve stable transmission of the differential signal and improve the display effect.

[0070] like Figure 6 As shown, as a fifth embodiment of the present application, a driving method is disclosed, which is used to drive the driving circuit 100 as described in any of the above embodiments. The driving method includes:

[0071] S1: Generates a drive signal to output to the signal trace;

[0072] S2: Obtain the resistance of the signal trace on the glass-based circuit board; and

[0073] S3: adjusting the received driving signal by matching the resistance of the signal line 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.

[0074] 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 driving signal, and the adjusted driving signal is output to the data driving module 140 to generate a corresponding data driving signal and input it to the display panel 200, thereby reducing the interference of the signal line 121 on the glass-based circuit, ensuring the stability of signal transmission, and improving and enhancing the display effect of the display panel 200.

[0075] like Figure 7 As shown, as the sixth embodiment of the present application, it further refines and improves the fifth embodiment. The driving circuit 100 includes a temperature detection module 170, and the step S2 includes:

[0076] S21: 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;

[0077] The first preset formula is the relationship between the resistivity and temperature of the signal trace 121:

[0078] Ρ(T)=ρ(0)*(1+αT);

[0079] Where, Ρ(T) represents the resistivity value at temperature T, ρ(0) represents the resistivity value at temperature 0°C, and α represents the temperature coefficient of copper resistivity;

[0080] The second preset formula is the relationship between the resistance and resistivity of the signal trace 121;

[0081] R = ρ (T) L / ;

[0082] Wherein, A is the cross-sectional area of ​​the signal trace 121 , and L is the length of the signal trace 121 .

[0083] Generally, the timing control module 110 internally stores the resistivity ρ of the signal trace 121 at various temperatures. When the glass-based PCB is operating, the temperature of the signal trace 121 is detected and fed back to the timing control module 110. The timing control module 110 then uses the corresponding calculation formula, R=ρL / A, to obtain the value of R1 based on the resistance detection before leaving the factory. Because ρ is the resistivity, a linearly changing value, and the change rule is the same for all glass substrates, the resistance value at room temperature of 25 degrees can be obtained as R1=ρ25*L / A→L / A=R1 / ρ25→R(T)=ρ(T)*L / A=ρ(T)*(R1 / ρ25). L / A of the same glass PCB does not change with temperature or time, only ρ changes with temperature. In this way, a 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.

[0084] like Figure 8 As shown, as the seventh embodiment of the present application, it is a further refinement and improvement of the above fifth embodiment, 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 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 trace 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 terminal connected between the first resistor R1 and the second resistor R2, an output terminal connected to the output terminal of the fifth resistor R5, and a control terminal connected to the output terminal of the switching signal through the first switch group 1241; the second transistor T2 has an input terminal connected between the second resistor R2 and the third resistor R3, an output terminal connected to the output terminal of the fifth resistor R5, and a control terminal connected to the output terminal of the switching signal through the second switch group 1242; the third transistor T3 has an input terminal connected between the third resistor R3 and the fourth resistor R4, and an output terminal connected to the output terminal of the switching signal. 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 1241 includes a first switch tube S1 and a second switch tube S2 connected in series, and the second switch group 1242 includes a third switch tube S3 and a fourth switch tube S4 connected in series. 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 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, and the output end of the eighth switch tube S8 is connected to the control end of the fourth transistor T4.

[0085] The step S3 comprises:

[0086] 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 trace, controlling corresponding switches to conduct to connect corresponding resistors 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;

[0087] The first control signal b1 is output to the control terminal of the first switch S1 and the control terminal of the third switch S3 to control the on / off state of the first and third switches S1 and S3. The second control signal b2 is output to the control terminal of the second switch S2 and the control terminal of the sixth switch S6 to control the on / off state of the second and sixth switches S2 and S6. 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 on / off state of the fourth and eighth switches S4 and S8. The fourth control signal b4 is output to the control terminal of the fifth and seventh switches S5 and S7 to control the on / off state of the fifth and seventh switches S5 and S7. The resistance of the signal trace 121 is actually detected or calculated, and then external impedance is matched based on the circuit of the signal trace 121, that is, different resistors are connected to ensure the stability of differential signal transmission.

[0088] like Figure 9 As shown, as the eighth embodiment of the present application, a display device 300 is disclosed, which includes the driving circuit 100 and the 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.

[0089] 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 driving 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.

[0090] 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.

[0091] 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 and outputs a driving signal; a drive signal adjustment module, disposed on the second circuit board, for receiving and adjusting the drive signal, wherein the drive signal adjustment module includes a signal trace and an impedance selection circuit, wherein the signal trace is connected to the impedance selection circuit; a trace resistance acquisition module, disposed on the second circuit board, for acquiring the resistance of the signal trace and 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; 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 trace to adjust the received drive signal, and outputs the adjusted drive signal to the data drive module to generate a corresponding data drive signal that is input to the display panel. The signal routing includes: A first differential signal trace 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 a timing control module and receive a 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.

2. 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 trace, the temperature detection module is connected to the trace resistance acquisition module, the temperature detection module calculates the resistance of the signal trace at the current temperature based on the first preset formula and the second preset formula and outputs the calculated value to the trace resistance acquisition module; The first preset formula is the relationship between the resistivity and temperature of the signal trace: Ρ(T)=P(0)*(1+αT); Where, P(T) represents the resistivity value at temperature T, P(0) represents the resistivity value at temperature 0°C, 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 = P (T) L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

3. The driving circuit according to any one of claims 1 to 2, wherein: The impedance selection circuit includes 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 is connected in series on the signal trace, 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 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; Each switch group includes two switch transistors connected in series. The first switch group includes a first switch transistor and a second switch transistor connected in series. The second switch group includes a third switch transistor and a fourth switch transistor connected in series. The third switch group includes a fifth switch transistor and a sixth switch transistor connected in series. The fourth switch group includes a seventh switch transistor and an eighth switch transistor connected in series. Input terminals of the first, third, fifth, and seventh switch transistors are connected to the output terminal of the switching signal. The output terminal of the second switch transistor is connected to the control terminal of the first transistor. The output terminal of the fourth switch transistor is connected to the control terminal of the second transistor. The output terminal of the sixth switch transistor is connected to the control terminal of the third transistor. The output terminal of the eighth switch transistor is connected to the control terminal of the fourth transistor. The control terminals of the first and third switch transistors receive a first control signal to turn on or off. The control terminals of the second and sixth switch transistors receive a second control signal to turn on or off. The control terminals of the fourth and eighth switch transistors receive a third control signal to turn on or off. The control terminals of the fifth and seventh switch transistors receive a fourth control signal to turn on or off.

4. The driving circuit according to claim 3, wherein: 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.

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

6. A driving method, characterized in that: Used to drive the driving circuit according to any one of claims 1 to 5, the driving method comprising: Generate drive signals to output to signal traces; 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.

7. The driving method according to claim 6, wherein: 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)=P(0)*(1+αT); Where, P(T) represents the resistivity value at temperature T, P(0) represents the resistivity value at temperature 0°C, 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 = P (T) L / A; Where A is the cross-sectional area of ​​the signal trace, and L is the length of the signal trace.

8. The driving method according to claim 6, wherein: 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 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 is connected in series on the signal trace, 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 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; 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 fourth transistor; the step of matching the resistance of the signal routing to the corresponding resistance to adjust the received drive signal, and outputting the adjusted drive signal to the data driving module to generate the corresponding data drive signal and input it to the display panel includes: 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 trace, controlling corresponding switch tubes to conduct to connect corresponding resistors 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 is output to the control end of the first switching tube and the control end of the third switching tube to control the conduction or disconnection of the first switching tube and the third switching tube, the second control signal is output to the control end of the second switching tube and the control end of the sixth switching tube to control the conduction or disconnection of the second switching tube and the sixth switching tube, the third control signal is output to the control end of the fourth switching tube and the control end of the eighth switching tube to control the conduction or disconnection of the fourth switching tube and the eighth switching tube, and the fourth control signal is output to the control end of the fifth switching tube and the control end of the seventh switching tube to control the conduction or disconnection of the fifth switching tube and the seventh switching tube.

9. A display device, characterized in that: The device comprises a driving circuit and a display panel according to any one of claims 1 to 5, wherein the driving circuit drives the display panel using a driving method according to any one of claims 6 to 8.

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