Display module and display device

Abstract

The present application discloses a display module and a display device, wherein the display module includes a light-emitting unit and a driving circuit, wherein the driving circuit includes a controller, a control chip, a detection module and a compensation feedback module, wherein the output end of the control chip includes a plurality of output channels, each of which is connected in series with a row of lamp beads, wherein the detection module is connected to the plurality of output channels, receives the driving current output by the controller, and detects whether the lamp beads in the light-emitting unit are abnormal; wherein the compensation feedback module is connected to the detection module and the controller, and when the detection module detects an abnormal lamp bead, the compensation feedback module notifies the controller to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead, and at the same time increases the driving current of the output channel corresponding to the row of lamp beads adjacent to the abnormal lamp bead. Through the above design, the display problem of dark spots or dark lines that occurs when the LED is abnormal can be improved.

Description

Technical Field

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

[0002] With the development of display technology, Mini-LED backlights with better uniformity and higher average brightness are increasingly used in high-end displays. Since Mini-LED backlights essentially use light-emitting LEDs to form a partition matrix in the display area, the brightness of each area of ​​the Mini-LED display can be adjusted by separately controlling the brightness of the LEDs in each partition, thereby achieving higher uniformity.

[0003] If an LED in the matrix LED partition becomes open-circuited or short-circuited due to life problems, the corresponding display area will have display problems such as dark spots or dark lines. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display module and a display device to improve the display problem of dark spots or dark lines that occurs when LED lamp beads are abnormal.

[0005] The embodiment of the present application discloses a display module, which includes a light-emitting unit and a driving circuit. The light-emitting unit includes multiple rows of lamp beads, each row of lamp beads is arranged in series, and the driving circuit includes a controller, a control chip, a detection module and a compensation feedback module. The controller outputs a lamp bead driving signal, the receiving end of the control chip is connected to the controller, the output end of the control chip includes multiple output channels, each of the output channels is connected in series with a row of lamp beads, and the control chip transmits a driving current to the corresponding output channel according to the lamp bead driving signal; the detection module is connected to the multiple output channels, receives the driving current output by the controller, and detects whether there is an abnormality in the lamp beads in the light-emitting unit; the compensation feedback module is connected to the detection module and the controller, and when the detection module detects an abnormal lamp bead, the compensation feedback module notifies the controller to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead, and at the same time increases the driving current of the output channel corresponding to the row of lamp beads adjacent to the abnormal lamp bead.

[0006] Optionally, the detection module includes multiple detection sub-modules, and the detection sub-modules are arranged in a one-to-one correspondence with the output channels of the control chip; the detection sub-module includes a sensing resistor, an amplifier, a first resistor, a second resistor, a third resistor, an analog-to-digital converter and a flag control module, the sensing resistor is connected in series with the corresponding output channel, the positive input end of the amplifier is connected to one end of the sensing resistor through the first resistor, the reverse input end of the amplifier is connected to the other end of the sensing resistor through the second resistor, the two ends of the third resistor are respectively connected to the reverse input end of the amplifier and the output end of the amplifier, the output end of the amplifier is also connected to one end of the analog-to-digital converter, and the other end of the analog-to-digital converter is connected to the flag control module, and the flag control module generates a code indicating whether the lamp beads in the row corresponding to the output channel are abnormal or normal according to the digital signal output by the analog-to-digital converter; the flag control module is connected to the compensation feedback module, and the generated code is input to the compensation feedback module.

[0007] Optionally, the positive input terminal of the amplifier is connected to one end of the sensing resistor connected to the light-emitting unit through a first resistor, and the negative input terminal of the amplifier is connected to one end of the sensing resistor connected to the control chip through a second resistor.

[0008] Optionally, the resistance value of the first resistor is R1, the resistance value of the second resistor is R2, the resistance value of the third resistor is R3, the potential of the end of the sensing resistor connected to the light-emitting unit is V1, the potential of the end of the sensing resistor connected to the controller is V2, and the output voltage of the amplifier is V0, wherein V0=((R2+R3)*V1-R3*V2) / R2; when the output voltage V0 of the amplifier changes, it is judged that the lamp bead corresponding to the output channel is abnormal.

[0009] Optionally, the lamp bead abnormality includes lamp bead short circuit and lamp bead open circuit. When the lamp bead is open circuit, the output voltage V0 of the amplifier becomes V1; when the lamp bead is short circuit, the output voltage V0 of the amplifier becomes larger.

[0010] Optionally, the driving circuit further includes a transistor, the base of the transistor is connected to the controller, the emitter of the transistor is connected to one end of each row of lamp beads away from the output channel, and the collector of the transistor is connected to the control chip.

[0011] Optionally, the light-emitting unit includes a plurality of light-emitting chips, the plurality of light-emitting chips are arranged in an array, and the light-emitting chip includes a plurality of rows of lamp beads, each row of lamp beads are arranged in series, and the lamp beads between different light-emitting chips are not connected; the output channels in the control chip are respectively arranged in series with the plurality of rows of lamp beads in the plurality of light-emitting chips.

[0012] Optionally, the display module also includes a plurality of focusing lenses, which are respectively arranged between two adjacent rows of lamp beads; wherein the height of the focusing lens is greater than the height of the lamp beads, the surface of the focusing lens is a curved surface, and along the light emitting direction of the lamp beads, the curvature of the surface of the focusing lens gradually increases.

[0013] Optionally, a reflective sheet is provided at the bottom of the focusing lens; or, a light source is provided at the bottom of the focusing lens, and the light source is connected to the control chip. When the detection module detects an abnormal lamp bead, the controller shuts down or reduces the driving current of the output channel corresponding to the abnormal lamp bead, increases the driving current of the output channel corresponding to the row of lamp beads adjacent to the abnormal lamp bead, and also controls the light source at the bottom of the focusing lens adjacent to the abnormal lamp bead to emit light.

[0014] An embodiment of the present application further discloses a display device, which includes the display module as described above.

[0015] The beneficial effects of the embodiments of the present application are as follows: the embodiments of the present application add a detection module and a compensation feedback module to the driving circuit, and detect whether there is an abnormality with the lamp beads in the light-emitting unit through the detection module, and then shut down or reduce the driving current of the output channel corresponding to the abnormal lamp beads through the compensation feedback module to avoid further damage to the circuit or the lamp beads, and at the same time increase the driving current of the output channel corresponding to the adjacent row of lamp beads to the abnormal lamp beads, so that the lamp beads in the adjacent row to the abnormal lamp beads emit higher brightness, thereby illuminating the area of ​​the abnormal lamp beads, thereby improving the black spot or black line phenomenon caused by the abnormal lamp beads. 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 diagram of a display module;

[0018] Figure 2 is a circuit diagram of a display module provided in an embodiment of the present application;

[0019] Figure 3 is a timing diagram of a display module provided in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of a detection submodule provided in an embodiment of the present application;

[0021] Figure 5 is a partial schematic diagram of a light-emitting unit provided in an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of a display device provided in an embodiment of the present application.

[0023] Among them, 10, display device; 20, display module; 100, light-emitting unit; 110, light-emitting chip; 111, lamp bead; 112, focusing lens; 200, driving circuit; 200A, driving board; 210, controller; 220, control chip; 221, control unit; 222, register; 223, current adjustment unit; 224, constant current output unit; 230, detection module; 231, detection submodule; RRX, sensing resistor; OP, amplifier; RR1, first resistor; RR2, second resistor; RR3, third resistor; ADC, analog-to-digital converter; F, flag control module; 240, compensation feedback module; 250, transistor. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] Figure 1 is a schematic diagram of a display module 20, such as Figure 1 As shown, the display module 20 includes a light-emitting unit 100 and a driving circuit 200. The light-emitting unit 100 includes a plurality of light-emitting chips 110 arranged in an array. Each light-emitting chip 110 is provided with a plurality of rows of lamp beads 111 composed of LEDs. The lamp beads 111 in each row are connected in series. The driving circuit 200 includes a plurality of driving boards 200A. Each driving board 200A drives the LED lamp beads 111 on a column of the light-emitting chips 110 respectively.

[0027] Since multiple LED lamp beads 111 are connected in series, when one LED lamp bead 111 is open-circuited or short-circuited, the entire series of multiple LED lamp beads 111 will display abnormal light emission, resulting in dark spots or dark lines on the display screen. If the probability of an LED working normally during consumer use is 0.999, and a Mini-LED backlight is composed of n LEDs, then the probability that the LEDs of this Mini-LED backlight product are normal during consumer use is 0.999 to the nth power; when n=1, the probability that the LEDs of the Mini-LED backlight product are normal during consumer use is 0.999; when n=10, the probability that the LEDs of the Mini-LED backlight product are normal during consumer use is 0.99; when n=100, the probability that the LEDs of the Mini-LED backlight product are normal during consumer use is 0.9; when n=1000, the probability that the LEDs of the Mini-LED backlight product are normal during consumer use is 0.367. It can be seen that when the number of LEDs used in Mini-LED reaches more than 100, the probability of damage to the backlight product during consumer use increases greatly. The experience given to consumers is that the life of the entire Mini-LED display is very short, affecting the consumer experience.

[0028] Based on the above problems, an embodiment of the present application provides a display module 20 to improve the display problem of dark spots or dark lines that occurs when LEDs are abnormal.

[0029] like Figure 2 and Figure 3 As shown, the display module 20 includes a light-emitting unit 100 and a driving circuit 200, the light-emitting unit 100 includes a plurality of rows of lamp beads 111, each row of lamp beads 111 is arranged in series, the driving circuit 200 includes a controller 210, a control chip 220, a detection module 230 and a compensation feedback module 240, the controller 210 outputs a driving signal of the lamp beads 111, the receiving end of the control chip 220 is connected to the controller 210, the output end of the control chip 220 includes a plurality of output channels, each of the output channels is connected in series with a row of lamp beads 111, and the control chip 220 drives the lamp beads 111 to the corresponding The detection module 230 is connected to the multiple output channels, receives the driving current output by the controller 210, and detects whether there is any abnormality in the lamp beads 111 in the light-emitting unit 100; the compensation feedback module 240 is connected to the detection module 230 and the controller 210. When the detection module 230 detects an abnormal lamp bead 111, the compensation feedback module 240 notifies the controller 210 to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead 111, and at the same time increases the driving current of the output channel corresponding to the adjacent row of lamp beads 111 to the abnormal lamp bead 111.

[0030] The embodiment of the present application adds a detection module 230 and a compensation feedback module 240 to the driving circuit 200. The detection module 230 is used to detect whether there is an abnormality in the lamp bead 111 in the light-emitting unit 100. Then, the compensation feedback module 240 is used to close or reduce the driving current of the output channel corresponding to the abnormal lamp bead 111 to avoid further damage to the circuit or the lamp bead 111. At the same time, the driving current of the output channel corresponding to the lamp bead 111 in the adjacent row to the abnormal lamp bead 111 is increased, so that the lamp bead 111 in the adjacent row to the abnormal lamp bead 111 emits higher brightness, thereby illuminating the area of ​​the abnormal lamp bead 111 and compensating for the brightness of the damaged channel, thereby improving the black spot or black line phenomenon caused by the abnormal lamp bead 111.

[0031] It should be noted that the display module 20 in the embodiment of the present application can be a backlight module. In this case, the light-emitting unit 100 is a backlight source, and the driving circuit 200 is a backlight driving circuit. The display module 20 can be an ordinary direct-type LED backlight module or a Mini-LED backlight module. In particular, since the Mini-LED backlight module has a large number of LED lamp beads 111, its service life is short and it is prone to defects. After adopting the design of the embodiment of the present application, even if the LED has an abnormality, it will not affect the product display, thereby increasing the average life of the Mini-LED in use.

[0032] Of course, the display module 20 in the embodiment of the present application may not be a backlight module. In this case, the display device does not contain a backlight module, the light-emitting unit 100 is a pixel light-emitting array in the display panel, and the driving circuit 200 is a display driving circuit. The corresponding display panel type is a direct display Mini-LED display panel or a Micro LED display panel. The light-emitting unit 100 is directly placed inside the display panel so that each light-emitting unit 100 can emit light independently.

[0033] In the embodiment of the present application, the control chip 220 includes a control unit 221, a register 222, a current adjustment unit 223 and a constant current output unit 224. The controller 210 is connected to the control unit 221 through an SPI signal line, and outputs the lamp bead 111 drive signal to the control unit 221. The control unit 221 is connected to the constant current output unit 224, and controls and monitors the current output by the constant current output unit 224 according to the lamp bead 111 drive signal. The current adjustment unit 223 is respectively connected to the register 222 and the constant current output unit 224, and adjusts the current output by the constant current output unit 224 according to the data stored in the register 222. The constant current output unit 224 has multiple output channels, each of which is connected in series with a row of lamp beads 111 to control whether a row of lamp beads 111 emits light.

[0034] like Figure 4 As shown, the detection module 230 includes a plurality of detection submodules 231 , and the detection submodules 231 are arranged in a one-to-one correspondence with the output channels of the control chip 220 . The detection submodule 231 includes a sensing resistor RRX, an amplifier OP, a first resistor RR1, a second resistor RR2, a third resistor RR3, an analog-to-digital converter ADC and a flag control module F. The sensing resistor RRX is connected in series with the corresponding output channel. The positive input end of the amplifier OP is connected to one end of the sensing resistor RRX through the first resistor RR1, the reverse input end of the amplifier OP is connected to the other end of the sensing resistor RRX through the second resistor RR2, the two ends of the third resistor RR3 are respectively connected to the reverse input end of the amplifier OP and the output end of the amplifier OP, the output end of the amplifier OP is also connected to one end of the analog-to-digital converter ADC, and the other end of the analog-to-digital converter ADC is connected to the flag control module F. The flag control module F generates a code indicating whether the lamp beads 111 in the row corresponding to the output channel are abnormal or normal according to the digital signal output by the analog-to-digital converter ADC; the flag control module F is connected to the compensation feedback module 240 to output the generated code to the compensation feedback module 240.

[0035] Specifically, the positive input end of the amplifier OP is connected to one end of the sensing resistor RRX connected to the light-emitting unit 100 through the first resistor RR1, and the negative input end of the amplifier OP is connected to one end of the sensing resistor RRX connected to the control chip 220 through the second resistor RR2. This setting facilitates the wiring between the amplifier OP and the sensing resistor RRX, and also facilitates the calculation of the output result of the amplifier OP. Of course, in other embodiments, the positive input end of the amplifier OP is connected to one end of the sensing resistor RRX connected to the control chip 220 through the first resistor RR1, and the negative input end of the amplifier OP is connected to one end of the sensing resistor RRX connected to the light-emitting unit 100 through the second resistor RR2.

[0036] Among them, the potential of one end of the sensing resistor RRX connected to the light-emitting unit 100 is V1, the potential of one end of the sensing resistor RRX connected to the controller 210 is V2, and the output voltage of the amplifier OP is V0; at the same time, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, and R3 represents the resistance value of the third resistor. In the embodiment of the present application, a high-precision small-resistance sensing resistor RRX is connected in series to the output channel of the control chip, and the voltage difference across the sensing resistor can represent the output current of the output channel; the embodiment of the present application utilizes the virtual disconnection principle V+=V1 of the amplifier OP, and the virtual short principle V-=V+=V1 of the amplifier OP, and because (V2-V-) / R2=(V--V0) / R3, it is concluded that V0=((R2+R3)*V1-R3*V2) / R2, and when the output voltage V0 of the amplifier OP changes, it can be judged that the lamp bead 111 corresponding to the output channel is abnormal.

[0037] When the lamp bead 111 corresponding to the output channel is abnormal, the analog-to-digital converter ADC converts the output voltage of the amplifier OP into a corresponding digital signal, and the flag control module F generates an abnormal code representing the row of lamp beads 111 corresponding to the output channel according to the digital signal, and sends it to the compensation feedback module 240. The compensation feedback module 240 notifies the controller 210 to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead 111, and at the same time increase the driving current of the output channel corresponding to the adjacent row of lamp beads 111 to the abnormal lamp bead 111.

[0038] In the embodiment of the present application, the abnormality of the lamp bead 111 includes short circuit and open circuit. When the lamp bead 111 is in a normal state, the value of V2-V1 remains unchanged, and the output voltage V0 of the amplifier OP remains unchanged. At this time, the flag control module F generates a code for normal operation, and the controller 210 does not perform special processing. When the lamp bead 111 is open, V1=V2, the output voltage V0 of the amplifier OP=V1, and V0 changes. At this time, the flag control module F generates an open circuit code based on the V0 voltage converted into a digital signal, and forwards it to the controller 210. The controller 210 controls the driver chip to close the current of the open channel or reduce the current of the open channel, and then increases the current of the channel adjacent to the open channel. Similarly, when the lamp bead 111 is short-circuited, V2-V1 increases, and the output voltage V0 of the amplifier OP also increases. At this time, the flag control module F generates a short-circuit code based on the V0 voltage converted into a digital signal, and forwards it to the controller 210. The controller 210 controls the driving chip to turn off the current of the short-circuit channel or reduce the current of the short-circuit channel, and then increases the current of the channel adjacent to the short-circuit channel.

[0039] The detection module 230 in the embodiment of the present application can be integrated with multiple detection submodules 231 to form an integrated circuit, or it can be composed of independent chip devices, each detection submodule 231 is connected to each output channel, which is not limited here. The embodiment of the present application obtains the detection submodule 231 by integrating several simple devices, and the abnormality of the lamp bead 111 can be judged by simple calculation detection, and the flag control module F can also output different identifications according to different abnormal conditions, so that the compensation feedback module 240 notifies the controller 210 to drive the LED lamp bead in a corresponding driving mode, so that the abnormal conditions of the LED lamp bead are compensated and adjusted in a targeted manner to meet more usage requirements. Moreover, the embodiment of the present application also uses the virtual break and virtual short principle of the amplifier to detect the electrical signal in the output channel. Through the signal amplification effect of the amplifier and the conversion effect of the analog-to-digital converter ADC, the flag control module F can generate the corresponding code according to the slight voltage change in the circuit, so that the detection accuracy is relatively high.

[0040] As an optional embodiment, the light-emitting unit 100 includes a plurality of light-emitting chips 110, the plurality of light-emitting chips 110 are arranged in an array, and the light-emitting chips 110 include a plurality of rows of lamp beads 111, each row of lamp beads 111 is arranged in series, and the lamp beads 111 between different light-emitting chips 110 are not connected; the output channels in the control chip 220 are respectively arranged in series with the plurality of rows of lamp beads 111 in the plurality of light-emitting chips 110. In addition, the number of controllers 210, the number of control chips 220, the number of detection modules 230, the number of compensation feedback modules 240 and the number of light-emitting chips 110 are the same and correspond one to one, and the detection module 230 and the compensation feedback module 240 are integrated on the control chip 220.

[0041] As another optional implementation, there is only one controller 210 in the driving circuit 200, and there are multiple control chips 220, detection modules 230, and compensation feedback modules 240; or, there are only one controller 210 and one control chip 220 in the driving circuit 200, and there are multiple detection modules 230 and compensation feedback modules 240; or, there is only one controller 210, one control chip 220, one detection module 230, and one compensation feedback module 240 in the driving circuit 200; of course, the driving circuit 200 can also adopt other design methods, which can be selected according to actual conditions and are not limited here.

[0042] In the embodiment of the present application, the driving circuit 200 further includes a transistor 250, the base of the transistor 250 is connected to the controller 210, the emitter of the transistor 250 is connected to one end of each row of lamp beads 111 away from the output channel, and the collector of the transistor 250 is connected to the control chip 220. Through the above design, one end of each row of series-connected lamp beads 111 receives the driving current through the output channel, and the other end is connected to the emitter of the transistor 250, realizing a grounding design, improving the safety of the driving circuit 200, and avoiding leakage problems.

[0043] like Figure 5 As shown, the display module 20 also includes a plurality of focusing lenses 112, and the plurality of focusing lenses 112 are respectively arranged between two adjacent rows of lamp beads 111, that is, there is at least one focusing lens 112 between every two rows of lamp beads 111, and the focusing lens 112 is a convex lens. When the light emitted by the light-emitting lamp beads 111 passes through the lens, the propagation direction of the light will be deflected downward, so that the light can propagate farther. In this way, when a certain row or column of lamp beads 111 is damaged, the light emitted by the light-emitting lamp beads 111 on both sides can propagate farther, thereby illuminating the area of ​​the damaged lamp beads 111, thereby improving the black spot or black line phenomenon caused by the damage of the lamp beads 111.

[0044] When a certain lamp bead is damaged, the driving circuit is used to increase the brightness of the two adjacent rows of lamp beads, and the focusing lens is used to focus the surrounding brightness to a darker area. While improving the problem of black spots or black lines caused by the damage of the lamp bead 111, the brightness of the abnormal area of ​​the lamp bead is made similar to that of other areas, thereby improving the display uniformity effect.

[0045] The focusing lens 112 between every two rows of lamp beads 111 can be a large lens, the length of which is equal to the length of a row of lamp beads 111; or the focusing lens 112 between every two rows of lamp beads 111 can be a plurality of small lenses, the length of which is equal to the length of one or more lamp beads 111. With this design, no matter which lamp bead 111 is abnormal, it can be illuminated by the light emitted by other light-emitting lamp beads 111.

[0046] In the embodiment of the present application, the height of the condenser lens 112 is greater than the height of the lamp bead 111, and the surface of the condenser lens 112 is a curved surface, and the curvature of the condenser lens 112 increases toward the top of the condenser lens 112, that is, along the light emitting direction of the lamp bead, the surface curvature of the condenser lens 112 gradually increases. Since the light emitted by the lamp bead has a certain range, usually around 135 degrees, and the light of the lamp bead is mostly concentrated above the lamp bead, the embodiment of the present application adopts a higher condenser lens 112, and combined with the shape of the top of the condenser lens 112, more light is refracted to the area where the abnormal lamp bead is located, so that the brightness of the area is further improved.

[0047] Optionally, the height of the focusing lens 112 is 2-3 times the height of the lamp bead 111. While increasing the brightness of the area where the abnormal lamp bead is located, it also avoids affecting the brightness of the adjacent normal lamp bead area, so that the brightness of the area where the abnormal lamp bead is located is similar to the brightness of the adjacent normal lamp bead area.

[0048] Optionally, a reflective sheet is provided below the focusing lens 112 to reflect light to the top of the focusing lens 112 to improve light utilization.

[0049] Optionally, a light source is provided under the focusing lens 112. When an abnormality occurs to the lamp beads adjacent to the focusing lens 112, in addition to using the controller to increase the brightness of the two adjacent rows of lamp beads, the controller is also used to start the light source under the focusing lens 112 adjacent to the abnormal lamp beads. Finally, the focusing lens 112 is used to converge the brightness of the bottom and surrounding areas to a darker area. The embodiment of the present application uses a three-way fill light design to increase the brightness of the area where the abnormal lamp beads are located, so that the overall display effect of the picture is more uniform.

[0050] As an optional implementation, when the light-emitting unit 100 is a pixel light-emitting array in a display panel, since the pixel light-emitting array itself can emit red, green and blue colors of light to realize various screen displays, when a lamp bead in the pixel light-emitting array is damaged, the controller 210 can be used to first shut down or reduce the driving current of the output channel corresponding to the abnormal lamp bead, and then the adjacent row of lamp beads to the abnormal lamp bead can be changed to white light, and the brightness of the adjacent row of lamp beads to the abnormal lamp bead can be increased, thereby improving the brightness of the light and avoiding the problem of mixed light.

[0051] like Figure 6 As shown, the embodiment of the present application further provides a display device, the display device 10 includes the display module 20 as described above, the display module 20 can be a backlight module in a backlight display product, or a combination of a light-emitting device and a display driver device in a direct display product. The display device 10 provided in the embodiment of the present application has a long service life, is not prone to display problems, and has good market competitiveness.

[0052] 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 module, comprising a light-emitting unit and a driving circuit, characterized in that: The light-emitting unit comprises a plurality of rows of lamp beads, each row of lamp beads is arranged in series, and the driving circuit comprises: Controller, outputs lamp bead driving signal; A control chip, wherein the receiving end of the control chip is connected to the controller, and the output end of the control chip includes a plurality of output channels, each of which is connected in series with a row of lamp beads, and the control chip transmits a driving current to a corresponding output channel according to a driving signal of the lamp beads; A detection module, connected to the multiple output channels, receives the driving current output by the control chip, and detects whether there is an abnormality in the lamp beads in the light-emitting unit; A compensation feedback module is connected to the detection module and the controller. When the detection module detects an abnormal lamp bead, the compensation feedback module notifies the controller to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead, and increases the driving current of the output channel corresponding to the row of lamp beads adjacent to the abnormal lamp bead; The light-emitting unit includes a plurality of light-emitting chips, the plurality of light-emitting chips are arranged in an array, and the light-emitting chips include a plurality of rows of lamp beads, each row of lamp beads is arranged in series, and the lamp beads between different light-emitting chips are not connected; the output channels in the control chip are respectively arranged in series with the plurality of rows of lamp beads in the plurality of light-emitting chips; The display module further comprises a plurality of condenser lenses, which are respectively arranged between two adjacent rows of lamp beads; wherein the height of the condenser lenses is greater than the height of the lamp beads, the surface of the condenser lenses is a curved surface, and the curvature of the surface of the condenser lenses gradually increases along the light emitting direction of the lamp beads; A light source is provided at the bottom of the focusing lens, and the light source is connected to the control chip. When the detection module detects an abnormal lamp bead, the controller not only turns off or reduces the driving current of the output channel corresponding to the abnormal lamp bead and increases the driving current of the output channel corresponding to the row of lamp beads adjacent to the abnormal lamp bead, but also controls the light source at the bottom of the focusing lens adjacent to the abnormal lamp bead to emit light.

2. The display module according to claim 1, wherein: The detection module includes a plurality of detection submodules, and the detection submodules are arranged in a one-to-one correspondence with the output channels of the control chip; The detection submodule includes a sensing resistor, an amplifier, a first resistor, a second resistor, a third resistor, an analog-to-digital converter and a flag control module, wherein the sensing resistor is connected in series with the corresponding output channel, the positive input end of the amplifier is connected to one end of the sensing resistor through the first resistor, the reverse input end of the amplifier is connected to the other end of the sensing resistor through the second resistor, the two ends of the third resistor are respectively connected to the reverse input end of the amplifier and the output end of the amplifier, the output end of the amplifier is also connected to one end of the analog-to-digital converter, and the other end of the analog-to-digital converter is connected to the flag control module, and the flag control module generates a code indicating whether the lamp beads in the row corresponding to the output channel are abnormal or normal according to the digital signal output by the analog-to-digital converter; The flag control module is connected to the compensation feedback module and inputs the generated code to the compensation feedback module.

3. The display module according to claim 2, wherein: The positive input end of the amplifier is connected to one end of the sensing resistor connected to the light-emitting unit through a first resistor, and the negative input end of the amplifier is connected to one end of the sensing resistor connected to the control chip through a second resistor.

4. The display module according to claim 3, wherein: The resistance value of the first resistor is R1, the resistance value of the second resistor is R2, the resistance value of the third resistor is R3, the potential of one end of the sensing resistor connected to the light-emitting unit is V1, the potential of one end of the sensing resistor connected to the control chip is V2, and the output voltage of the amplifier is V0, wherein V0=((R2+R3)*V1-R3*V2) / R2; when the output voltage V0 of the amplifier changes, it is judged that the lamp bead corresponding to the output channel is abnormal.

5. The display module according to claim 4, characterized in that: The lamp bead abnormality includes lamp bead short circuit and lamp bead open circuit. When the lamp bead is open circuit, the output voltage V0 of the amplifier becomes V1; when the lamp bead is short circuit, the output voltage V0 of the amplifier becomes larger.

6. The display module according to claim 2, wherein: The driving circuit also includes a transistor, the base of the transistor is connected to the controller, the emitter of the transistor is connected to one end of each row of lamp beads away from the output channel, and the collector of the transistor is connected to the control chip.

7. The display module according to claim 1, wherein: The light-emitting unit is a pixel light-emitting array in the display panel, and the pixel light-emitting array emits red, green and blue lights to realize picture display. When a lamp bead in the pixel light-emitting array is damaged, the compensation feedback module notifies the controller to turn off or reduce the driving current of the output channel corresponding to the abnormal lamp bead, and then changes the light emitted by the adjacent row of lamp beads to the abnormal lamp bead into white light, while increasing the brightness of the adjacent row of lamp beads to the abnormal lamp bead.

8. A display device, characterized in that: Comprising a display module as described in any one of claims 1-7.

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