Display driving circuit and display device

Abstract

The invention discloses a display driving circuit and a display device, the display driving circuit comprises a power line, at least one compensation line and at least one compensation module, the power line comprises at least one power supply main line and a plurality of parallel power supply branch lines, and the power supply branch lines are electrically connected with the power supply main line; the compensation lines and the power supply main lines are arranged in parallel, and the signal transmission direction in the compensation lines is opposite to the signal transmission direction in the corresponding power supply main lines; at least part of the power supply branch lines are connected with the power supply main line through the compensation module, the compensation module comprises a switch tube, the input end of the switch tube is electrically connected with the power supply main line, the control end of the switch tube is electrically connected with the compensation line, and the output end of the switch tube is electrically connected with the corresponding power supply branch line. Through the above design, the uneven brightness of the display panel caused by the impedance of the ELVDD power line can be avoided.

Description

Technical Field

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

[0002] Organic Light-Emitting Diode (OLED), also known as Organic Electroluminesence Display (OELD), is favored by consumers because OLED displays are lighter, thinner, brighter, lower power consumption, faster response, higher contrast, wider color gamut, and wider viewing angle than liquid crystal displays (LCD). In addition, OLED displays have no backlight and can be made ultra-thin.

[0003] The OLED display has multiple rows of pixels, and each pixel is provided with a constant power supply through the ELVDD power line. Since the ELVDD power line itself has impedance, the ELVDD voltage at the near and far ends of the ELVDD power line of the display driver IC (DDIC) will be inconsistent. This will cause the pixels at the near end of the display driver chip to be brighter due to the large voltage, and the pixels at the far end of the display driver chip to be darker due to the low voltage, resulting in brightness differences and uneven brightness of the display panel. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display driving circuit and a display device, which can avoid uneven brightness of a display panel due to the impedance of an ELVDD power line itself.

[0005] The embodiment of the present application discloses a display driving circuit, which includes a power line, at least one compensation line and at least one compensation module, wherein the power line includes at least one main power line and multiple parallel power branch lines, wherein the power branch lines are electrically connected to the main power line, and the power branch lines are also electrically connected to the input end of a driving switch in a pixel; the compensation line is arranged in parallel with the main power line, and the signal transmission direction in the compensation line is opposite to the signal transmission direction in the corresponding main power line; at least part of the power branch lines is connected to the main power line through the compensation module, and the compensation module includes a switch tube, wherein the input end of the switch tube is electrically connected to the main power line, the control end of the switch tube is electrically connected to the compensation line, and the output end of the switch tube is electrically connected to the corresponding power branch line.

[0006] Optionally, the display driving circuit further includes a crack detection line, which is used to detect cracks on the display panel and is arranged at an edge of the display panel; the compensation line is connected to the crack detection line and is formed in the same process as the crack detection line.

[0007] Optionally, the display driving circuit also includes a driving chip, the power connection end of the power main line is electrically connected to the driving chip, the power connection end of the crack detection line is electrically connected to the driving chip, one end of the compensation line is connected to the crack detection line, and the other end of the compensation line extends toward the driving chip.

[0008] Optionally, the driving chip includes a timing control unit, a sensing module, a constant voltage module, a first MOSFET and a second MOSFET, the timing control unit is electrically connected to the control end of the first MOSFET and the control end of the second MOSFET at the same time, the sensing module is electrically connected to the input end of the first MOSFET, the constant voltage module is electrically connected to the input end of the second MOSFET, and the output end of the first MOSFET and the output end of the second MOSFET are electrically connected to the power connection end of the crack detection line at the same time; wherein the switch types of the first MOSFET and the second MOSFET are different, and the timing control unit outputs different types of voltages when detecting cracks on the display panel and when the display panel displays normally.

[0009] Optionally, the power line includes two power main lines, which are respectively a first power main line and a second power main line, and both ends of the power branch line are respectively connected to the first power main line and the second power main line through a compensation module, and the power connection ends of the first power main line and the second power main line are both electrically connected to the driving chip; the display driving circuit includes two compensation lines, which are respectively a first compensation line and a second compensation line, and the first compensation line and the second compensation line are both connected to the crack detection line, the first compensation line is located on a side of the power branch line close to the first power main line, and the second compensation line is located on a side of the power branch line close to the second power main line; the first compensation line and the first power main line are connected to the same adjacent compensation module, and the second compensation line and the second power main line are connected to the same adjacent compensation module.

[0010] Optionally, the crack detection line is an integral whole and is at least arranged on the first side, the second side and the third side of the display panel, the first side is the side close to the first power main line, the second side is the side close to the second power main line, and the third side is the side away from the driving chip; the first compensation line and the second compensation line are simultaneously connected to the crack detection line located on the third side.

[0011] Optionally, the crack detection line includes a first detection line and a second detection line, and the power connection end of the first detection line and the power connection end of the second detection line are both electrically connected to the driving chip; the first detection line and the second detection line are both L-shaped, the first detection line is located on the first side and the second side of the display panel, and the second detection line is located on the third side and the second side of the display panel, the first side is the side close to the first power main line, the second side is the side close to the second power main line, and the third side is the side away from the driving chip; one end of the first compensation line is connected to the output end of the first detection line, and the other end of the first compensation line extends toward the direction of the driving chip; one end of the second compensation line is connected to the output end of the second detection line, and the other end of the second compensation line extends toward the direction of the driving chip.

[0012] Optionally, the power line includes only one main power line, and one end of the power branch line is connected to the main power line through the compensation module; the display driving circuit includes a compensation line, the compensation line is connected to the crack detection line, and the compensation line is located on a side of the power branch line close to the main power line.

[0013] Optionally, each of the power branch lines is connected to the power main line through the compensation module.

[0014] An embodiment of the present application further discloses a display device, which includes a display panel and the display driving circuit as described above, wherein the display driving circuit is used to drive the display panel.

[0015] The beneficial effects of the embodiments of the present application are as follows: the embodiments of the present application add compensation lines and compensation modules in the display driving circuit, and make the input end of the switch tube in the compensation module electrically connected to the power main line, the control end electrically connected to the compensation line, and the output end electrically connected to the power branch line; due to the existence of impedance on the power line, the impedance on the power line gradually increases along the transmission direction of the current in the power main line; and since the signal transmission direction in the compensation line is opposite to the signal transmission direction in the corresponding power main line, and the compensation line also has impedance, the impedance on the compensation line gradually increases along the transmission direction of the current in the compensation line, so that the gate-source voltage of the switch tube in this direction decreases, and the on-resistance of the switch tube increases; finally, the voltage lost on the power line is compensated on the compensation line, and the power supply voltage provided by each row of the power branch line is equal or similar, thereby improving the problem of uneven brightness of the display panel caused by the impedance of the ELVDD power line itself. 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:

[0017] Figure 1 is a schematic block diagram of a display device provided in an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram showing the circuit architecture in a display panel;

[0019] Figure 3 is a schematic diagram of a pixel driving unit;

[0020] Figure 4 is a schematic diagram of a display driving circuit provided in the first embodiment of the present application;

[0021] Figure 5 It is a characteristic diagram of a switching tube;

[0022] Figure 6 is a partial schematic diagram of a display driving circuit provided in the first embodiment of the present application;

[0023] Figure 7 is a schematic diagram of a display driving circuit combined with a crack detection line provided in the first embodiment of the present application;

[0024] Figure 8 is a schematic diagram of another display driving circuit combined with a crack detection line provided in the first embodiment of the present application;

[0025] Fig. 9 is a schematic diagram of a driver chip provided in the first embodiment of the present application;

[0026] Fig.10 is a schematic diagram of a display driving circuit provided in a second embodiment of the present application;

[0027] Fig.11 It is a schematic diagram of another display driving circuit provided in the second embodiment of the present application.

[0028] Among them, 10, display device; 100, display driving circuit; 110, power line; 111, main power line; 111a, first main power line; 111b, second main power line; 112, branch power line; 120, compensation line; 120a, first compensation line; 120b, second compensation line; 130, compensation module; 131, switch tube; 140, crack detection line; 141, first detection line; 142, second detection line; 150, driving chip; 151, timing control unit; 152, sensing module; 153, constant voltage module; 154, first MOS tube; 155, second MOS tube; 200, display panel; 200A, pixel driving unit. DETAILED DESCRIPTION

[0029] 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.

[0030] In addition, unless otherwise clearly specified or limited, "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] like Figure 1 As shown, an embodiment of the present application provides a display device, wherein the display device 10 includes a display panel 200 and a display driving circuit 100, wherein the display driving circuit 100 is used to drive the display panel 200. The display panel 200 is an OLED panel, and the display driving circuit 100 includes a wiring part on the display panel 200 and a chip part outside the display panel 200.

[0032] Figure 2The present invention is a schematic diagram of a display panel, wherein a plurality of pixel driving units 200A arranged in an array are provided on the display panel 200. Taking the 2T1C architecture as an example, each pixel driving unit 200A includes a data control switch T1, a driving switch T2, a capacitor C and a light-emitting unit OLED. The control end of the data control switch T1 is connected to the scan line Scan, the input end of the data control switch T1 is connected to the data line Data, the output end of the data control switch T1 is connected to the control end of the driving switch T2, the input end of the driving switch T2 is connected to the power line ELVDD, the output end of the driving switch T2 is connected to the light-emitting unit OLED, the power line ELVDD provides a VDD voltage for the light-emitting unit OLED, and the two ends of the capacitor C are respectively connected to the control end and the input end of the driving switch T2. The data control switch T1 is responsible for charging and discharging the capacitor C, and the driving switch T2 is responsible for controlling the current reaching the light-emitting unit OLED, thereby controlling the brightness of the light-emitting unit OLED.

[0033] like Figure 3 As shown, when the pixel driving unit 200A adopts the 3T1C architecture, the pixel driving unit 200A further includes a sensing switch T3 and a sensing line Sence line, the input end of the sensing switch T3 is connected to the sensing line Sence line, the output end of the sensing switch T3 is connected to the next scanning line S2, and the output end of the sensing switch T3 is connected to the output end of the driving switch T2. The sensing switch T3 is used to detect the current flowing through the driving switch T2, or the potential of the anode of the light-emitting unit device, so as to calculate the threshold voltage of the driving switch.

[0034] Embodiment 1:

[0035] Figure 4 1 is a schematic diagram of a display driving circuit 100 provided in the first embodiment of the present application. The display driving circuit 100 includes a main power line 111 and multiple parallel power branch lines 112. The multiple power branch lines 112 are arranged in a one-to-one correspondence with multiple rows of pixels. The power branch lines 112 are electrically connected to the main power line 111, and the power branch lines 112 are also electrically connected to the input end of the driving switch in the pixel to provide a VDD voltage for the light-emitting unit OLED in the pixel.

[0036] The display driving circuit 100 also includes a compensation line 120 and at least one compensation module 130. The compensation line 120 is arranged in parallel with the power main line 111, and the signal transmission direction in the compensation line 120 is opposite to the signal transmission direction in the corresponding power main line 111; at least part of the power branch line 112 is connected to the power main line 111 through the compensation module 130, and the compensation module 130 includes a switch tube 131, the input end of the switch tube 131 is electrically connected to the power main line 111, the control end of the switch tube 131 is electrically connected to the compensation line 120, and the output end of the switch tube 131 is electrically connected to the corresponding power branch line 112.

[0037] In the embodiment of the present application, the switch tube 131 is a MOS tube (metal-oxide semiconductor field effect transistor), and its on-resistance is related to the source-drain current Ids and the gate-source voltage Vgs when it is turned on. Figure 5 As shown, as the source-drain current Ids increases, the on-resistance of the switch tube 131 gradually increases; as the gate-source voltage Vgs increases, the on-resistance of the switch tube 131 gradually decreases. The embodiment of the present application aims to utilize the design of the compensation line 120 and the compensation module 130 to neutralize the attenuation trend of the power supply voltage in the power line 110, so that the power supply voltage VDD received by each row of pixels is similar or even the same.

[0038] In the embodiment of the present application, a compensation line 120 and a compensation module 130 are added to the display driving circuit 100, and the input end of the switch tube 131 in the compensation module 130 is electrically connected to the power main line 111, the control end is electrically connected to the compensation line 120, and the output end is electrically connected to the power branch line 112; due to the existence of impedance on the power line 110, the impedance on the power line 110 gradually increases along the transmission direction of the current in the power main line 111; and since the signal transmission direction in the compensation line 120 is opposite to the signal transmission direction in the corresponding power main line 111, and the compensation line 120 also has impedance, the impedance on the compensation line 120 gradually increases along the transmission direction of the current in the compensation line 120, so that the gate-source voltage of the switch tube 131 in this direction decreases, and the on-resistance of the switch tube 131 increases; finally, the voltage lost on the power line 110 is compensated on the compensation line 120, thereby improving the problem of uneven brightness of the display panel caused by the impedance of the ELVDD power line 110 itself.

[0039] by Figure 6For example, compensation module 1 and compensation module 2 correspond to two rows of connected pixels respectively, the direction from compensation module 1 to compensation module 2 is the signal transmission direction in the power main line 111, and the direction from compensation module 2 to compensation module 1 is the signal transmission direction in the compensation line 120. The input end of the switch tube 131 in compensation module 1 and compensation module 2 is electrically connected to the power main line 111, the power main line 111 provides the switch tube 131 in compensation module 1 with a voltage of ELVDD_1, and the power main line 111 provides the switch tube 131 in compensation module 2 with a voltage of ELVDD_2. The control end of the switch tube 131 in compensation module 1 and compensation module 2 is electrically connected to the compensation line 120, the compensation line 120 provides the switch tube 131 in compensation module 1 with a voltage of CTR_1, and the compensation line 120 provides the switch tube 131 in compensation module 2 with a voltage of CTR_2. The output end of the switch tube 131 in the compensation module 1 is electrically connected to the previous row of power branch line 112, and the voltage provided to the previous row of power branch line 112 is ELVDD_O1; the output end of the switch tube 131 in the compensation module 2 is electrically connected to the next row of power branch line 112, and the voltage provided to the next row of power branch line 112 is ELVDD_O2.

[0040] The resistance of the power main line 111 between compensation module 1 and compensation module 2 is equivalent to Rt1, and the resistance of the compensation line 120 between compensation module 1 and compensation module 2 is equivalent to Re1. Because the ELVDD voltage in the power main line 111 is transmitted from top to bottom, after passing through Rt1, ELVDD_1 is higher than ELVDD_2. On the contrary, since the voltage on the compensation line 120 is transmitted from bottom to top, the CTR_2 voltage is higher than CTR_1, which causes the gate-source voltage Vgs_2 (Vgs_2 = CTR_2-ELVDD_2) of the switch tube 131 in the compensation module 2 to be greater than the gate-source voltage Vgs_1 (Vgs_1 = CTR_1-ELVDD_1) of the switch tube 131 in the compensation module 1. Figure 5 It can be seen that the on-resistance of the switch tube 131 in the compensation module 2 is smaller than the on-resistance of the switch tube 131 in the compensation module 1. It can be seen that when the switch tube 131 is fully turned on, under the same current, along the transmission direction of the signal in the power main line 111, the on-resistance of the switch tube 131 gradually decreases.

[0041] Although the voltage of ELVDD_2 is lower than that of ELVDD_1 due to the resistance of Rt1, the voltage from ELVDD_1 to ELVDD_O1 will be reduced due to the on-resistance of the switch tube 131 in the compensation module 2. In theory, if the on-resistance and the resistance of the wiring Rt1 are appropriate, as long as the voltage drop on Rt1 and the compensation module 2 is equal to the voltage drop on the compensation module 1, the brightness difference problem between a row of pixels corresponding to the compensation module 1 and a row of pixels corresponding to the compensation module 2 can be solved. This can be achieved by adjusting the voltage received by the power line 110 and the compensation line 120, as well as simulating Rt1 and Re1, and the on-resistance. This process can be completed in the test stage before the display panel leaves the factory, and will not be elaborated on here.

[0042] like Figure 7 and Figure 8 As shown, in the embodiment of the present application, the display driving circuit 100 further includes a crack detection line 140, which is used to detect cracks on the display panel and is arranged at the edge of the display panel; the compensation line 120 is connected to the crack detection line 140 and is formed in the same process as the crack detection line 140. Through the above design, the wiring and process of the compensation line 120 can be simplified, reducing the manufacturing difficulty.

[0043] In the embodiment of the present application, the display driving circuit 100 further includes a driving chip 150, the power connection end of the power main line 111 is electrically connected to the driving chip 150, the power connection end of the crack detection line 140 is electrically connected to the driving chip 150, one end of the compensation line 120 is connected to the crack detection line 140, and the other end of the compensation line 120 extends toward the direction of the driving chip 150 and is grounded. Through the above design, a driving chip 150 is used to provide electrical signals to the power main line 111 and the compensation line 120 at the same time, and there is no need to add an additional driving structure of the compensation line 120. The existing crack detection line 140 in the display panel is used as an intermediate connection line. While simplifying the process and saving costs, the line impedance is increased by combining the crack detection line 140 and the compensation line 120, so that the impedance can be closer to the power main line 111 and the power branch line 112 without changing the cross-sectional size of the line.

[0044] As a specific implementation method, Figure 7As shown, the crack detection line 140 is at least arranged on the first side, the second side and the third side of the display panel, wherein the driving chip 150 is connected to the fourth side of the display panel, the third side is arranged opposite to the fourth side, and the first side and the second side are arranged opposite to each other. One end of the compensation line 120 is connected to the crack detection line 140 located on the third side, and the other end of the compensation line 120 extends toward the driving chip 150 and is grounded. In the embodiment of the present application, the detection area of ​​the crack detection line is large, and it can simultaneously detect whether cracks appear on the first side, the second side and the third side of the display panel.

[0045] As another specific implementation, Figure 8 As shown, different from the above-mentioned embodiment, the crack detection line 140 is L-shaped and is only arranged on the first side and the third side of the display panel. One end of the compensation line 120 is connected to the end of the crack detection line 140 located on the third side, and the other end of the compensation line 120 extends toward the direction of the driving chip 150 and is grounded.

[0046] Of course, in other implementations, the crack detection lines 140 may also be arranged in other ways.

[0047] like Fig. 9 As shown, in the embodiment of the present application, the driving chip 150 includes a timing control unit 151, a sensing module 152, a constant voltage module 153, a first MOSFET 154 and a second MOSFET 155, the timing control unit 151 is electrically connected to the control end of the first MOSFET 154 and the control end of the second MOSFET 155 at the same time, the sensing module 152 is electrically connected to the input end of the first MOSFET 154, the constant voltage module 153 is electrically connected to the input end of the second MOSFET 155, the output end of the first MOSFET 154 and the output end of the second MOSFET 155 are electrically connected to the power connection end of the crack detection line 140 at the same time; wherein the switch types of the first MOSFET 154 and the second MOSFET 155 are different, and the timing control unit 151 outputs different types of voltages when detecting cracks on the display panel and when the display panel displays normally.

[0048] Specifically, when the first MOS tube 154 is an N-type MOS tube, the second MOS tube 155 is a P-type MOS tube; when it is necessary to check the cracks on the display panel, the timing control unit 151 outputs a high-level signal, the first MOS tube 154 is turned on, the second MOS tube 155 is turned off, and the crack detection line 140 passes the sensing voltage to perform panel detection; when it is found that there is a brightness difference in the display panel, or when the display panel starts to display, the timing control unit 151 outputs a low-level signal, the second MOS tube 155 is turned on, the first MOS tube 154 is turned off, and the crack detection line 140 passes the compensation voltage to perform brightness compensation. When the first MOS tube 154 is a P-type MOS tube and the second MOS tube 155 is an N-type MOS tube, when it is necessary to check the cracks on the display panel, the timing control unit 151 outputs a low-level signal, the first MOS tube 154 is turned on, the second MOS tube 155 is turned off, and the crack detection line 140 passes the sensing voltage to perform panel detection; when it is found that there is a brightness difference in the display panel, or when the display panel starts to display, the timing control unit 151 outputs a high-level signal, the second MOS tube 155 is turned on, the first MOS tube 154 is turned off, and the crack detection line 140 passes the compensation voltage to perform brightness compensation.

[0049] In the embodiment of the present application, each of the power branch lines 112 is connected to the power main line 111 through a compensation module 130, and the power voltage on each power branch line 112 is equalized by adjustment. Of course, only one compensation module 130 can be connected to the power branch lines 112 far away from the driver chip 150 to perform targeted compensation; of course, other arrangements of the compensation modules 130 can also be designed, and the selection is made according to the actual situation.

[0050] In the embodiment of the present application, the switch tube 131 in the compensation module 130 is an N-type MOS tube, and the voltage on the compensation line 120 is higher than the voltage on the power main line 111. Alternatively, the switch tube 131 in the compensation module 130 is a P-type MOS tube, and the voltage on the compensation line 120 is lower than the voltage on the power main line 111.

[0051] In the embodiment of the present application, the compensation line 120 may not be connected to the crack detection line 140 . The compensation line 120 is provided on the display panel as a new independent structure and is powered separately by the driving chip 150 .

[0052] Embodiment 2:

[0053] like Fig.10 and Fig.11As shown, as a display driving circuit provided as the second embodiment of the present application, different from the first embodiment, the power line 110 in the embodiment of the present application includes two power main lines 111, and the two power main lines 111 are respectively a first power main line 111a and a second power main line 111b, and the two ends of the power branch line 112 are respectively connected to the first power main line 111a and the second power main line 111b through the compensation module 130, and the power connection ends of the first power main line 111a and the second power main line 111b are both electrically connected to the driving chip 150.

[0054] At the same time, the display driving circuit 100 includes two compensation lines 120, which are respectively a first compensation line 120a and a second compensation line 120b. The first compensation line 120a and the second compensation line 120b are both connected to the crack detection line 140. The first compensation line 120a is located on the side of the power branch line 112 close to the first power main line 111a, and the second compensation line 120b is located on the side of the power branch line 112 close to the second power main line 111b; the first compensation line 120a and the first power main line 111a are connected to the same adjacent compensation module 130, and the second compensation line 120b and the second power main line 111b are connected to the same adjacent compensation module 130.

[0055] The embodiment of the present application provides voltage to both ends of a row of pixels at the same time, thereby preventing abnormal brightness at both ends of the pixels in the same row from occurring due to the impedance of the power branch line 112 itself.

[0056] As a specific implementation method, Fig.10 As shown, the crack detection line 140 is an integral body, and is at least arranged on the first side, the second side and the third side of the display panel, the first side is the side close to the first power main line 111a, the second side is the side close to the second power main line 111b, and the third side is the side away from the driving chip 150; the first compensation line 120a and the second compensation line 120b are simultaneously connected to the crack detection line 140 located on the third side. Through this design, on the basis of the same circuit, not only can crack detection be performed on each side of the display panel, but also the brightness of the end of the display panel away from the driving chip 150 can be compensated, so that the brightness of the display panel is uniform and the display effect is improved.

[0057] As another specific implementation, Fig.11As shown, the crack detection line 140 includes a first detection line 141 and a second detection line 142, and the power connection end of the first detection line 141 and the power connection end of the second detection line 142 are both electrically connected to the driving chip 150; the first detection line 141 and the second detection line 142 are both L-shaped, the first detection line 141 is located at the first side and the second side of the display panel, and the second detection line 142 is located at the third side and the second side of the display panel, the first side is a side close to the first power main line 111a, the second side is a side close to the second power main line 111b, and the third side is a side away from the driving chip 150; one end of the first compensation line 120a is connected to the output end of the first detection line 141, and the other end of the first compensation line 120a extends toward the direction of the driving chip 150; one end of the second compensation line 120b is connected to the output end of the second detection line 142, and the other end of the second compensation line 120b extends toward the direction of the driving chip 150.

[0058] Since the first power main line 111a and the second power main line 111b are both powered by the driving chip 150 separately, the attenuation of the electric signal on the first power main line 111a and the attenuation of the electric signal on the second power main line 111b are independent. Therefore, this embodiment designs the first detection line 141 and the second detection line 142 respectively powered by the driving chip 150, so that the attenuation of the electric signal on the first detection line 141 and the first compensation line 120a corresponds to the attenuation of the electric signal on the first power main line 111a, and the attenuation of the electric signal on the second detection line 142 and the second compensation line 120b corresponds to the attenuation of the electric signal on the second power main line 111b, thereby preventing uneven compensation effect of the compensation module 130 on both sides of the display panel.

[0059] In addition, in the embodiment of the present application, parallel crack detection lines 140 and compensation lines 120 are simultaneously arranged on both sides of the display panel. When the display panel is subjected to crack detection, the compensation line 120 can also serve as a detection line. Since the compensation line 120 is located on the inner side of the crack detection line 140, when the detection and analysis show that the compensation line 120 is also cracked, it means that the cracks of the display panel are very serious and need to be repaired or scrapped. Therefore, the detection results of the compensation line 120 during crack detection can also be used to analyze the severity of the cracks, thereby achieving the purpose of killing two birds with one stone.

[0060] The above content is a further detailed description 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 display driving circuit, characterized in that: include: A power line, comprising at least one main power line and a plurality of parallel branch power lines, wherein the branch power lines are electrically connected to the main power line and are also electrically connected to an input terminal of a driving switch in a pixel; At least one compensation line, the compensation line is arranged in parallel with the power main line, and the signal transmission direction in the compensation line is opposite to the signal transmission direction in the corresponding power main line; as well as At least one compensation module, at least part of the power branch line is connected to the power main line through the compensation module, the compensation module includes a switch tube, the input end of the switch tube is electrically connected to the power main line, the control end of the switch tube is electrically connected to the compensation line, and the output end of the switch tube is electrically connected to the corresponding power branch line.

2. The display driving circuit according to claim 1, characterized in that: The display driving circuit further includes a crack detection line, which is used to detect cracks on the display panel and is arranged at an edge of the display panel; The compensation line is connected to the crack detection line and is formed in the same process as the crack detection line.

3. The display driving circuit according to claim 2, characterized in that: The display driving circuit also includes a driving chip, the power connection end of the power main line is electrically connected to the driving chip, the power connection end of the crack detection line is electrically connected to the driving chip, one end of the compensation line is connected to the crack detection line, and the other end of the compensation line extends toward the driving chip.

4. The display driving circuit according to claim 3, characterized in that: The driving chip includes a timing control unit, a sensing module, a constant voltage module, a first MOS tube and a second MOS tube, the timing control unit is electrically connected to the control end of the first MOS tube and the control end of the second MOS tube at the same time, the sensing module is electrically connected to the input end of the first MOS tube, the constant voltage module is electrically connected to the input end of the second MOS tube, and the output end of the first MOS tube and the output end of the second MOS tube are electrically connected to the electrical connection end of the crack detection line at the same time; The switch types of the first MOS tube and the second MOS tube are different, and the timing control unit outputs different types of voltages when detecting cracks on the display panel and when the display panel displays normally.

5. The display driving circuit according to claim 3, characterized in that: The power line includes two power main lines, the two power main lines are respectively a first power main line and a second power main line, the two ends of the power branch line are respectively connected to the first power main line and the second power main line through a compensation module, and the power connection ends of the first power main line and the second power main line are both electrically connected to the driver chip; The display driving circuit includes two compensation lines, which are respectively a first compensation line and a second compensation line. The first compensation line and the second compensation line are both connected to the crack detection line. The first compensation line is located on a side of the power branch line close to the first power main line, and the second compensation line is located on a side of the power branch line close to the second power main line. The first compensation line and the first power main line are connected to the same adjacent compensation module, and the second compensation line and the second power main line are connected to the same adjacent compensation module.

6. The display driving circuit according to claim 5, characterized in that: The crack detection line is an integral whole and is at least arranged on the first side, the second side and the third side of the display panel, the first side is the side close to the first power main line, the second side is the side close to the second power main line, and the third side is the side away from the driving chip; the first compensation line and the second compensation line are simultaneously connected to the crack detection line located on the third side.

7. The display driving circuit according to claim 5, characterized in that: The crack detection line includes a first detection line and a second detection line, and the power connection end of the first detection line and the power connection end of the second detection line are both electrically connected to the driving chip; the first detection line and the second detection line are both L-shaped, the first detection line is located at the first side and the second side of the display panel, and the second detection line is located at the third side and the second side of the display panel, the first side is a side close to the first power main line, the second side is a side close to the second power main line, and the third side is a side away from the driving chip; One end of the first compensation line is connected to the output end of the first detection line, and the other end of the first compensation line extends toward the driving chip; One end of the second compensation line is connected to the output end of the second detection line, and the other end of the second compensation line extends toward the driving chip.

8. The display driving circuit according to claim 3, characterized in that: The power line includes only one main power line, and one end of the branch power line is connected to the main power line through a compensation module; The display driving circuit comprises a compensation line, the compensation line is connected to the crack detection line, and the compensation line is located at a side of the power branch line close to the power main line.

9. The display driving circuit according to any one of claims 1 to 8, characterized in that: Each of the power branch lines is connected to the power main line through the compensation module.

10. A display device, characterized in that: It comprises a display panel and a display driving circuit as claimed in any one of claims 1 to 9, wherein the display driving circuit is used to drive the display panel.

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