Display driving circuit and display device

Abstract

The present application discloses a display driver circuit and a display device. The display driver circuit includes a power line, at least one compensation line, and at least one compensation module. The power line includes at least one main power line and multiple parallel power branch lines, each of which is electrically connected to the main power line. 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 some of the power branch lines are connected to the main power line through the compensation module. The compensation module includes a switching transistor, the input end of which is electrically connected to the main power line, the control end of which is electrically connected to the compensation line, and the output end of which is electrically connected to the corresponding power branch line. This design can avoid uneven brightness of the display panel due to the inherent impedance of the ELVDD power line.

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, have lower power consumption, faster response, higher contrast, wider color gamut, and wider viewing angle than liquid crystal displays (LCD). OLED displays do not have backlight sources and can be made ultra-thin.

[0003] OLED displays have multiple rows of pixels, each of which is supplied with a constant power supply via the ELVDD power line. Due to the inherent impedance of the ELVDD power line, the ELVDD voltage at the end near and far from the display driver IC (DDIC) is inconsistent. This causes pixels near the DD IC to appear brighter due to the higher voltage, while pixels far from the DD IC appear darker due to the lower voltage. This results in a brightness difference and uneven brightness across 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 the ELVDD power line itself.

[0005] An 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. The power line includes at least one main power line and multiple parallel power branch lines, 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 the driving switch in the 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, 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 the 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 a crack on the display panel and when the display panel is displaying 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 the two ends of the power branch line are respectively connected to the first power main line and the second power main line through the 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 the side of the power branch line close to the first power main line, and the second compensation line is located on the 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 arranged at least 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, which is connected to the crack detection line, and the compensation line is located on the 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 a compensation line and a compensation module 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 because 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; ultimately, 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 those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive 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 This is a characteristic diagram of a switching tube;

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

[0023] Figure 7 This 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 This 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] Figure 9 is a schematic diagram of a driver chip provided in the first embodiment of the present application;

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

[0027] Figure 11 This 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, driver 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. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0030] In addition, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on 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 configured to drive the display panel 200. The display panel 200 is an OLED panel, and the display driving circuit 100 includes a wiring portion on the display panel 200 and a chip portion outside the display panel 200.

[0032] Figure 2The present invention is a schematic diagram of a display panel. The display panel 200 is provided with a plurality of pixel driving units 200A arranged in an array. Taking a 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 a scan line Scan, the input end of the data control switch T1 is connected to a 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 a power line ELVDD, and the output end of the driving switch T2 is connected to the light-emitting unit OLED. The power line ELVDD provides a VDD voltage to the light-emitting unit OLED. 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 a 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 scan 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, thereby calculating the threshold voltage of the driving switch.

[0034] Example 1:

[0035] Figure 4 This 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 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 131 gradually increases; as the gate-source voltage Vgs increases, the on-resistance of the switch 131 gradually decreases. The present embodiment 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 on the power line 110, ensuring 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 driver circuit 100. The input end of the switch tube 131 in the compensation module 130 is electrically connected to the main power line 111, the control end is electrically connected to the compensation line 120, and the output end is electrically connected to the branch power line 112. Due to the presence of impedance on the power line 110, the impedance on the power line 110 gradually increases along the direction of current transmission in the main power line 111. Since the signal transmission direction in the compensation line 120 is opposite to the signal transmission direction in the corresponding main power line 111, and the compensation line 120 also has impedance, the impedance on the compensation line 120 gradually increases along the direction of current transmission in the compensation line 120, causing the gate-source voltage of the switch tube 131 in this direction to decrease and the on-resistance of the switch tube 131 to increase. Ultimately, 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 connected rows of pixels, respectively. The direction from compensation module 1 to compensation module 2 corresponds to the signal transmission direction on the power main line 111, and the direction from compensation module 2 to compensation module 1 corresponds to the signal transmission direction on the compensation line 120. The input terminals of the switches 131 in compensation modules 1 and 2 are electrically connected to the power main line 111. The power main line 111 provides the voltage ELVDD_1 to the switches 131 in compensation module 1, and the power main line 111 provides the voltage ELVDD_2 to the switches 131 in compensation module 2. The control terminals of the switches 131 in compensation modules 1 and 2 are electrically connected to the compensation line 120. The compensation line 120 provides the voltage CTR_1 to the switches 131 in compensation module 1, and the compensation line 120 provides the voltage CTR_2 to the switches 131 in compensation module 2. The output end of the switch tube 131 in the compensation module 1 is electrically connected to the power branch line 112 in the previous row, and the voltage provided to the power branch line 112 in the previous row is ELVDD_O1; the output end of the switch tube 131 in the compensation module 2 is electrically connected to the power branch line 112 in the next row, and the voltage provided to the power branch line 112 in the next row 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 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 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. Therefore, when the switch tube 131 is fully turned on, under the same current, the on-resistance of the switch tube 131 gradually decreases along the transmission direction of the signal in the power main line 111.

[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 is also 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 trace Rt1 are appropriate, and the voltage drop across Rt1 and the compensation module 2 is equal to the voltage drop across the compensation module 1, the brightness difference problem between the row of pixels corresponding to the compensation module 1 and the 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, simulating Rt1 and Re1, and the on-resistance. This process can be completed during the test phase before the display panel leaves the factory and will not be elaborated on here.

[0042] like Figure 7 and Figure 8 As shown, in this embodiment of the present application, the display driver circuit 100 further includes a crack detection line 140, which is used to detect cracks on the display panel and is disposed 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. This design simplifies the wiring and manufacturing process of the compensation line 120, reducing manufacturing difficulty.

[0043] In the embodiment of the present application, the display driver circuit 100 further includes a driver chip 150. The power connection end of the main power line 111 is electrically connected to the driver chip 150. The power connection end of the crack detection line 140 is electrically connected to the driver 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 driver chip 150 and is grounded. Through this design, a single driver chip 150 simultaneously provides electrical signals to both the main power line 111 and the compensation line 120. This eliminates the need for an additional drive structure for the compensation line 120 and utilizes the existing crack detection line 140 in the display panel as an intermediate connection. This simplifies the manufacturing process and reduces costs. Furthermore, the combination of the crack detection line 140 and the compensation line 120 increases the line impedance, allowing the impedance to more closely approximate the impedance of the main power line 111 and the branch power line 112 without changing the line's cross-sectional dimensions.

[0044] As a specific implementation method, Figure 7As shown, the crack detection line 140 is disposed at least on the first, second, and third sides of the display panel. The driver chip 150 is connected to the fourth side of the display panel, the third side is disposed opposite the fourth side, and the first and second sides are disposed opposite each other. One end of the compensation line 120 is connected to the crack detection line 140 on the third side, while the other end of the compensation line 120 extends toward the driver chip 150 and is grounded. In this embodiment of the present application, the crack detection line has a larger detection area and can simultaneously detect whether cracks are present on the first, second, and third sides of the display panel.

[0045] As another specific embodiment, Figure 8 As shown, unlike the above embodiment, the crack detection line 140 is L-shaped and is only provided 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 embodiments, the crack detection lines 140 may also be arranged in other ways.

[0047] like Figure 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, and 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 is displaying normally.

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

[0049] In the embodiment of the present application, each of the power branch lines 112 is connected to the main power line 111 via a compensation module 130, which adjusts the power voltage on each power branch line 112 to be equal. Alternatively, only one compensation module 130 may be connected to the power branch lines 112 that are far from the driver chip 150 for targeted compensation. Alternatively, other arrangements of the compensation modules 130 may be used, depending on the specific situation.

[0050] In the embodiment of the present application, the switch tube 131 in the compensation module 130 is an N-type MOSFET, 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 MOSFET, 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] Example 2:

[0053] like Figure 10 and Figure 11As shown, the display driving circuit provided as the second embodiment of the present application is different from the first embodiment in that 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 simultaneously, thereby preventing abnormal brightness at both ends of pixels in the same row from occurring due to the impedance of the power branch line 112 itself.

[0056] As a specific implementation method, Figure 10 As shown, the crack detection line 140 is a single unit, located on at least the first, second, and third sides of the display panel. The first side is close to the first power main line 111a, the second side is close to the second power main line 111b, and the third side is away from the driver chip 150. The first and second compensation lines 120a, 120b are simultaneously connected to the crack detection line 140 on the third side. This design allows for crack detection on all sides of the display panel, all within the same circuit, while also compensating for brightness on the side of the display panel away from the driver chip 150, ensuring uniform brightness and improving display quality.

[0057] As another specific embodiment, Figure 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 on the first side and the second side of the display panel, and the second detection line 142 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 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; 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 separately by the driver chip 150, the attenuation of the electrical signal on the first power main line 111a and the attenuation of the electrical 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 driver chip 150, so that the attenuation of the electrical signal on the first detection line 141 and the first compensation line 120a corresponds to the attenuation of the electrical signal on the first power main line 111a, and the attenuation of the electrical signal on the second detection line 142 and the second compensation line 120b corresponds to the attenuation of the electrical signal on the second power main line 111b, thereby preventing uneven compensation effects of the compensation modules 130 on both sides of the display panel.

[0059] In addition, the embodiment of the present application simultaneously sets parallel crack detection lines 140 and compensation lines 120 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 in 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 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, they can make several simple deductions or substitutions 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 display driving circuit, characterized in that: include: Power lines, including 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 the input end of the driving switch in the pixel; At least one compensation line, the compensation line being arranged in parallel with the main power line, and the signal transmission direction in the compensation line being opposite to the signal transmission direction in the corresponding main power line; as well as at least one compensation module, at least part of the power branch lines are connected to the power main line through the compensation module, the compensation module comprising a switch tube, an input end of the switch tube being electrically connected to the power main line, a control end of the switch tube being electrically connected to the compensation line, and an output end of the switch tube being electrically connected to the corresponding power branch line; Along the transmission direction of the current in the compensation line, the impedance on the compensation line gradually increases, and the gate-source voltage of the switch tube in this direction decreases, and the on-resistance of the switch tube increases.

2. The display driving circuit according to claim 1, wherein: 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, wherein: 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, wherein: 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 electrical connection end of the crack detection line at the same time. The first MOSFET and the second MOSFET have different switch types, and the timing control unit outputs different types of voltages when detecting a crack on the display panel and when the display panel displays normally.

5. The display driving circuit according to claim 3, wherein: 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 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, wherein: The crack detection line is a whole and is arranged at least 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, wherein: The crack detection line includes a first detection line and a second detection line, wherein 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 driver 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 driver 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, wherein: 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, which is connected to the crack detection line and is located on 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, wherein: Each of the power branch lines is connected to the power main line through the compensation module.

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

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