Display driving board and display device

Abstract

The invention discloses a display driving board and a display device. The display driving board comprises a main control module and a double-backlight circuit. The double-backlight circuit comprises a first backlight circuit and a second backlight circuit, the input end of the first backlight circuit is connected with the output end of the main control module, the output end is connected with the first output interface, the input end of the second backlight circuit is connected with the output end of the main control module, and the output end is connected with the second output interface; the main control module converts an information source signal received by the first input interface or the second input interface into a first screen picture driving signal and a second screen picture driving signal and outputs the first screen picture driving signal and the second screen picture driving signal to the first display screen and the second display screen through the first output interface and the second output interface respectively. The first backlight circuit and the second backlight circuit receive backlight enable signals output by the main control module, generate corresponding backlight drive signals and output the backlight drive signals to the first display screen and the second display screen respectively. According to the invention, the main control module and the double backlight circuits are arranged on one driving board, so that double-screen display is driven by a single driving board.

Description

Technical Field

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

[0002] A monitor is a tool that displays files on the screen and then reflects them to the human eye. It is widely used in learning, entertainment, office work, etc. With people's growing material and cultural needs, the screen sizes of monitors currently on the market cannot meet people's needs. The monitor is too small and cannot be viewed by multiple people from multiple sides, which affects the display effect and the user experience is poor. Therefore, monitors with dual screens have emerged to meet people's needs.

[0003] Currently, there are many application demands for multi-screen expansion in the fields of games and office, but basically all products on the market only support single-screen expansion applications. A single-chip solution can drive a single module, but a single-chip solution that drives dual backlight chips to drive dual screens does not yet exist. How to solve the problem of dual screens requiring dual driver board solutions for effective driving has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display driver board and a display device to achieve dual-screen display through a single display driver board.

[0005] The present application discloses a display driver board, which includes a first input interface, a second input interface, a main control module, a first output interface, a second output interface and a dual backlight circuit; the input end of the main control module is connected to the first input interface and the second input interface respectively, and the output end of the main control module is connected to the first output interface, the second output interface and the dual backlight circuit respectively; the dual backlight circuit includes a first backlight circuit and a second backlight circuit, the input end of the first backlight circuit is connected to the output end of the main control module, and the output end is connected to the first output interface, the input end of the second backlight circuit is connected to the output end of the main control module, and the output end is connected to the second output interface; wherein the first input interface and the second input interface receive different signal source signals, the main control module converts the signal source signal received by the first input interface or the second input interface into a first screen picture driving signal and a second screen picture driving signal and outputs them to a first display screen and a second display screen respectively through the first output interface and the second output interface, the first backlight circuit and the second backlight circuit receive the backlight enable signal output by the main control module to generate a corresponding backlight driving signal and output them to the first display screen and the second display screen respectively through the first output interface and the second output interface, so as to control the backlight brightness display of the first display screen and the second display screen.

[0006] Optionally, the display driver board includes a power input circuit, the first backlight circuit includes a first backlight chip and a first backlight drive signal control circuit, the first backlight chip is connected to the main control module and the power input circuit, and receives the backlight enable signal and the backlight digital-to-analog conversion signal output by the main control module, outputs a first current backlight drive signal to the first display screen, and outputs a first control signal to control the switch of the first backlight drive signal control circuit to control the voltage input from the power input circuit to the first display screen; the second backlight circuit includes a second backlight chip and a second backlight drive signal control circuit, the second backlight chip is connected to the main control module and the power input circuit, and receives the backlight enable signal and the backlight digital-to-analog conversion signal output by the main control module, outputs a first current backlight drive signal to the first display screen, and outputs a first control signal to control the switch of the first backlight drive signal control circuit to control the voltage input from the power input circuit to the first display screen; The main control module outputs a backlight enable signal and a backlight digital-to-analog conversion signal, outputs a second current backlight drive signal to a second display screen, and outputs a second control signal to control the switch of the second backlight drive signal control circuit to control the voltage input from the power input circuit to the second display screen; wherein the current magnitudes of the first current backlight drive signal and the second current backlight drive signal are equal, and the first control signal controls the switch of the first backlight drive signal control circuit to control the voltage input from the power input circuit to the first display screen to be equal to the voltage input from the power input circuit to the second display screen by the second control signal.

[0007] Optionally, the first backlight drive signal control circuit includes a first switch tube, a control end of the first switch tube is connected to the first backlight chip, an input end is grounded, and an output end is connected between the output end of the power input circuit and the input end of the first display screen; the second backlight drive signal control circuit includes a second switch tube, a control end of the second switch tube is connected to the second backlight chip, an input end is grounded, and an output end is connected between the output end of the power input circuit and the input end of the second display screen; wherein, the first switch tube and the second switch tube are of the same model, and are both MOS tubes that are turned on at a high level and turned off at a low level.

[0008] Optionally, the first backlight circuit includes a first current regulating unit, which is arranged between the output end of the first backlight chip and the input end of the first display screen, and the first current regulating unit adjusts the minimum value of the current input to the first display screen to 5%-8% of the maximum current; the second backlight circuit includes a second current regulating unit, which is arranged between the output end of the second backlight chip and the input end of the second display screen, and the second current regulating unit adjusts the minimum value of the current input to the second display screen to 5%-8% of the maximum current; wherein, the first current regulating unit includes a first adjustable resistor, the second current regulating unit includes a second adjustable resistor, and the adjustable resistance range of the first adjustable resistor and the second adjustable resistor is the same.

[0009] Optionally, the first backlight circuit includes a first anti-interference circuit, one end of which is connected to the first backlight chip and the other end is grounded; the first anti-interference circuit includes a first capacitor and a first resistor, one end of the first resistor is grounded, and the other end is connected to the first backlight chip through the first capacitor; the second backlight circuit includes a second anti-interference circuit, one end of the second anti-interference circuit is connected to the second backlight chip and the other end is grounded; the second anti-interference circuit includes a second capacitor and a second resistor, one end of the second resistor is grounded, and the other end is connected to the second backlight chip through the second capacitor; wherein the resistance values ​​of the first resistor and the second resistor are equal, and the capacity of the first capacitor and the second capacitor are the same.

[0010] Optionally, the first backlight circuit includes a first voltage stabilizing circuit, which is arranged between the input end of the first display screen and the output end of the first backlight drive signal control circuit, and the first voltage stabilizing circuit stabilizes the power supply voltage adjusted by the first backlight drive signal control circuit to output it to the first display screen; the second backlight circuit includes a second voltage stabilizing circuit, which is arranged between the input end of the second display screen and the output end of the second backlight drive signal control circuit, and the second voltage stabilizing circuit stabilizes the power supply voltage adjusted by the second backlight drive signal control circuit to output it to the second display screen.

[0011] Optionally, the first backlight drive signal control circuit also includes a first voltage-dividing resistor, one end of which is connected to the control end of the first switch tube, and the other end is connected to the input end of the first switch tube; the second backlight drive signal control circuit also includes a second voltage-dividing resistor, one end of which is connected to the control end of the second switch tube, and the other end is connected to the input end of the second switch tube.

[0012] Optionally, the first voltage stabilizing circuit includes a first double magnetic bead and a first voltage stabilizing diode, the input end of the first double magnetic bead is connected between the output end of the first backlight drive signal control circuit and the output end of the power input circuit, and the output end is connected to the input end of the first display screen through the first voltage stabilizing diode; the second voltage stabilizing circuit includes a second double magnetic bead and a second voltage stabilizing diode, the input end of the second double magnetic bead is connected between the output end of the second backlight drive signal control circuit and the output end of the power input circuit, and the output end is connected to the input end of the second display screen through the second voltage stabilizing diode.

[0013] Optionally, the display driver board further includes a power interface, the power input circuit includes a power chip and a power voltage switching circuit, the power chip receives a backlight enable signal from the main control module, and controls the power voltage switching circuit to convert the input power voltage into an operating voltage for the first display screen and the second display screen;

[0014] The power supply voltage switching circuit includes a first triode, a first diode, a third resistor, a fourth resistor, a third switch tube, a second diode and a third capacitor; the control end of the first triode is connected to the main control module, the output end is grounded, and the input end is connected to the first diode, the third resistor and the fourth resistor. One end of the third resistor is connected to the fourth resistor, and the other end is connected to the control end of the third switch tube. The input end of the first diode is connected to the input end of the first triode, and the output end is connected to the control end of the third switch tube. One end of the fourth resistor is connected to the input end of the first triode, and one end is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively. The output end of the second diode is connected to the input end of the third switch tube, and the input end is connected to the output end of the third switch tube. The input end of the third switch tube is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively, and the output end is connected to the input end of the first display screen and the second display screen. The third capacitor is connected between the control end and the input end of the third switch tube.

[0015] The present application also discloses a display device, which includes a first display screen, a second display screen, and a display driver board as described above, wherein the display driver board receives a signal source input from the outside and converts it into a first screen image driving signal and a second screen image driving signal, which are output to the first display screen and the second display screen, and controls the dual backlight circuit to generate a corresponding backlight driving signal through a main control module, which is output to the first display screen and the second display screen respectively through a first output interface and a second output interface to control the backlight display of the first display screen and the second display screen.

[0016] Compared with the original dual-screen display solution that requires dual driver boards to implement, the present application provides a display driver board, which is provided with a main control module and two backlight circuits corresponding to the two display screens. The input interface of the display driver board receives different source signals, and the main control module converts the source signals received by the interface into a first screen picture drive signal and a second screen picture drive signal, and outputs them to the first display screen and the second display screen respectively through the first output interface and the second output interface. The two backlight circuits receive the backlight enable signal output by the main control module to generate corresponding backlight drive signals, and output them to the first display screen and the second display screen respectively through different output interfaces, so as to control the backlight brightness display of the first display screen and the second display screen, thereby realizing a single driver board driving dual-screen display, and saving most of the repeated component costs required for the dual driver boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 is a structural schematic diagram of a display driver board according to a first embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of a dual backlight circuit of a display driving board of a second embodiment of the present application;

[0020] Figure 3 is a structural schematic diagram of a dual backlight circuit of a display driver board according to a third embodiment of the present application;

[0021] Figure 4 is a structural schematic diagram of a dual backlight circuit of a display driving board according to a fourth embodiment of the present application;

[0022] Figure 5 is a structural schematic diagram of a dual backlight circuit of a display driving board according to a fifth embodiment of the present application;

[0023] Figure 6 is a structural schematic diagram of a power input circuit of a display driving board according to a sixth embodiment of the present application;

[0024] Figure 7 It is a structural schematic diagram of a display device of the seventh embodiment of the present application.

[0025] Among them, 100, display driver board; 110, first input interface; 120, second input interface; 130, main control module; 140, first output interface; 150, second output interface; 160, dual backlight circuit; 161, first backlight circuit; 1611, first backlight chip; 1612, first backlight drive signal control circuit; T1, first switch tube; RD1, first voltage divider resistor; 1613, first current regulating unit; RL1, first adjustable resistor; 1614, first anti-interference circuit; C1, first capacitor; R1, first resistor; 1615, first voltage stabilizing circuit; BL1, first dual magnetic beads; DL1, first voltage stabilizing diode; 162, second backlight circuit; 1621, second backlight chip; 1622, second backlight drive signal control control circuit; T2, second switch tube; RD2, second voltage-dividing resistor; 1623, second current regulating unit; RL2, second adjustable resistor; 1624, second anti-interference circuit; C2, second capacitor; R2, second resistor; 1625, second voltage stabilizing circuit; BL2, second double magnetic beads; DL2, second voltage stabilizing diode; 170, power input circuit; 171, power chip; 172, power voltage switching circuit; Q1, first transistor; D1, first diode; R3, third resistor; R4, fourth resistor; T3, third switch tube; D2, second diode; C3, third capacitor; 200, display device; 210, first display screen; 220, second display screen; BL_EN, backlight enable signal; BL_ADJ, backlight digital-to-analog conversion signal. DETAILED DESCRIPTION

[0026] 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.

[0027] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0028] Embodiment 1:

[0029] refer to Figure 1As shown, as a first embodiment of the present application, a display driver board 100 is disclosed, and the display driver board 100 includes a first input interface 110, a second input interface 120, a main control module 130, a first output interface 140, a second output interface 150 and a dual backlight circuit 160; the input end of the main control module 130 is respectively connected to the first input interface 110 and the second input interface 120, and the output end of the main control module 130 is respectively connected to the first output interface 140, the second output interface 150 and the dual backlight circuit 160; the dual backlight circuit 160 includes a first backlight circuit 161 and a second backlight circuit 162, the input end of the first backlight circuit 161 is connected to the output end of the main control module 130, and the output end is connected to the first output interface 140, and the input end of the second backlight circuit 162 is connected to the main control module 1 The output end of the main control module 130 is connected to the output end of the main control module 130, and the output end is connected to the second output interface 150; wherein, the first input interface 110 and the second input interface 120 receive different source signals, and the main control module 130 converts the source signal received by the first input interface 110 or the second input interface 120 into a first screen picture driving signal and a second screen picture driving signal and outputs them to the first display screen 210 and the second display screen 220 respectively through the first output interface 140 and the second output interface 150, and the first backlight circuit 161 and the second backlight circuit 162 receive the backlight enable signal BL_EN output by the main control module 130 to generate a corresponding backlight driving signal and output them to the first display screen 210 and the second display screen 220 respectively through the first output interface 140 and the second output interface 150, so as to control the backlight brightness display of the first display screen 210 and the second display screen 220.

[0030] In this embodiment, a dual-screen backlight drive display can be realized by using a display driver board 100. The display driver board 100 is provided with two different input interfaces, namely a first input interface 110 and a second input interface 120. The first input interface 110 and the second input interface 120 are respectively used to access an external HDMI signal or a VGA signal. The main control module 130 converts the source signal (HDMI signal or VGA signal) received by the first input interface 110 or the second input interface 120 into a first screen picture driving signal and a second screen picture driving signal and outputs them to the first display screen 210 and the second display screen 210 through the first output interface 140 and the second output interface 150, respectively. Display screen 220, the first backlight circuit 161 and the second backlight circuit 162 receive the backlight enable signal BL_EN output by the main control module 130 to generate corresponding backlight drive signals and output them to the first display screen 210 and the second display screen 220 through the first output interface 140 and the second output interface 150 respectively, so as to control the backlight brightness display of the first display screen 210 and the second display screen 220, so as to realize a single driver board driving the backlight brightness display of two or even multiple display screens. Compared with the original solution of two driver boards driving two display screens respectively, most of the repeated component costs required for the double boards are saved, the assembly space of the whole machine is solved, and an aesthetic layout is realized.

[0031] Embodiment 2:

[0032] refer to Figure 2 As shown, as the second embodiment of the present application, it is a further refinement of the above-mentioned first embodiment. The display driver board 100 includes a power input circuit 170, and the first backlight circuit 161 includes a first backlight chip 1611 and a first backlight drive signal control circuit 1612. The first backlight chip 1611 is connected to the main control module 130 and the power input circuit 170, and receives the backlight enable signal BL_EN and the backlight digital-to-analog conversion signal BL_ADJ output by the main control module 130, outputs a first current backlight drive signal to the first display screen 210, and outputs a first control signal to control the switch of the first backlight drive signal control circuit 1612 to control the voltage input from the power input circuit 170 to the first display screen 210.

[0033] Furthermore, the second backlight circuit 162 includes a second backlight chip 1621 and a second backlight drive signal control circuit 1622, the second backlight chip 1621 is connected to the main control module 130 and the power input circuit 170, and receives the backlight enable signal BL_EN and the backlight digital-to-analog conversion signal BL_ADJ output by the main control module 130, outputs a second current backlight drive signal to the second display screen 220, and outputs a second control signal to control the switch of the second backlight drive signal control circuit 1622 to control the voltage input from the power input circuit 170 to the second display screen 220; wherein the current magnitudes of the first current backlight drive signal and the second current backlight drive signal are equal, by ensuring that the current magnitudes of the first current backlight drive signal and the second current backlight drive signal are equal, and controlling the two The input voltages of the display screens are equal in magnitude, which can achieve consistency in the brightness of the two display screens; consistent brightness and contrast can improve the user's visual experience, especially in dual-screen display or multi-screen interactive applications, where users can enjoy a more comfortable and natural viewing experience; the first control signal controls the switch of the first backlight drive signal control circuit 1612 to control the voltage input from the power input circuit 170 to the first display screen 210 to be equal to the voltage input from the power input circuit 170 to the second display screen 220 controlled by the second control signal; the two backlight circuits have similar structures and share the same control logic, which simplifies circuit design and maintenance, and using the same backlight enable signal and backlight digital-to-analog conversion signal can reduce the number of control lines required.

[0034] Further, the first backlight drive signal control circuit 1612 includes a first switch tube T1, the control end of the first switch tube T1 is connected to the first backlight chip 1611, the input end is grounded, and the output end is connected between the output end of the power input circuit 170 and the input end of the first display screen 210; the second backlight drive signal control circuit 1622 includes a second switch tube T2, the control end of the second switch tube T2 is connected to the second backlight chip 1621, the input end is grounded, and the output end is connected between the output end of the power input circuit 170 and the input end of the second display screen 220; each display screen has an independent backlight control circuit, and the backlight brightness of each display screen can be adjusted separately according to actual needs, thereby increasing the flexibility of the system; wherein, the first switch tube T1 and the second switch tube T2 are of the same model, both of which are MOS tubes that are turned on at a high level and turned off at a low level. This selection ensures the consistency of the electrical characteristics of the two switch tubes, which helps to achieve more stable and reliable backlight control. Since the control end of the switch tube is directly connected to the backlight chip, the intermediate links are reduced, which helps to improve the anti-interference ability of the system.

[0035] In addition, the first backlight drive signal control circuit 1612 also includes a first voltage-dividing resistor RD1, one end of which is connected to the control end of the first switch tube T1, and the other end is connected to the input end of the first switch tube T1; the second backlight drive signal control circuit 1622 also includes a second voltage-dividing resistor RD2, one end of which is connected to the control end of the second switch tube T2, and the other end is connected to the input end of the second switch tube T2; adding resistance for voltage division at this position of the backlight circuit is conducive to the fast and effective opening of the backlight MOS tube switch, avoiding a long dead time, increasing the MOS tube switch utilization efficiency, making the boost circuit smoother, and preventing spike voltage from damaging the MOS tube.

[0036] Embodiment 3:

[0037] like Figure 3 As shown, as the third embodiment of the present application, it is a further refinement of any of the above embodiments, the first backlight circuit 161 includes a first current regulating unit 1613, the first current regulating unit 1613 is arranged between the output end of the first backlight chip 1611 and the input end of the first display screen 210, and the first current regulating unit 1613 adjusts the minimum value of the current input to the first display screen 210 to 5%-8% of the maximum current; the second backlight circuit 162 includes a second current regulating unit 1623, the second current regulating unit 1623 is arranged between the output end of the second backlight chip 1621 and the input end of the second display screen 220, and the second current regulating unit 1623 adjusts the minimum value of the current input to the second display screen 220 to 5%-8% of the maximum current; wherein, the first current regulating unit 1613 includes a first adjustable resistor RL1, the second current regulating unit 1623 includes a second adjustable resistor RL2, and the adjustable resistance range of the first adjustable resistor RL1 and the second adjustable resistor RL2 is the same.

[0038] In the present embodiment, adding an adjustable resistor to the backlight circuit is beneficial for adjusting the minimum backlight current to 5%-8% of the maximum value, generally adjusted to 5%. Compared with the previous backlight scheme, it can be reflected that the black screen is darker, and the backlight current is smaller in the case of a black screen, and the duty cycle control can be effectively implemented through software, so that the black screen can be more restored to its essence.

[0039] Embodiment 4:

[0040] like Figure 4As shown, as the fourth embodiment of the present application, it is a further improvement and perfection of any of the above embodiments, the first backlight circuit 161 includes a first anti-interference circuit 1614, one end of the first anti-interference circuit 1614 is connected to the first backlight chip 1611, and one end is grounded; the first anti-interference circuit 1614 includes a first capacitor C1 and a first resistor R1, one end of the first resistor R1 is grounded, and the other end is connected to the first backlight chip 1611 through the first capacitor C1; the second backlight circuit 162 includes a second anti-interference circuit 1624, one end of the second anti-interference circuit 1624 is connected to the second backlight chip 1621, and one end is grounded; the second anti-interference circuit 1624 includes a second capacitor C2 and a second resistor R2, one end of the second resistor R2 is grounded, and the other end is connected to the second backlight chip 1621 through the second capacitor C2; wherein, the resistance values ​​of the first resistor R1 and the second resistor R2 are equal, and the capacitance of the first capacitor C1 and the second capacitor C2 are the same.

[0041] In this embodiment, the backlight circuit adds resistance and capacitance to reduce interference in the circuit. The matching of RC values ​​is relatively important, which directly affects the loop part of the backlight chip's external output. Matching the RC values ​​effectively makes the loop more stable and reduces interference with the EMI of the entire driver board.

[0042] Embodiment 5:

[0043] refer to Figure 5 As shown, as the fifth embodiment of the present application, it is a further refinement and improvement of any of the above embodiments. The first backlight circuit 161 includes a first voltage stabilizing circuit 1615, and the first voltage stabilizing circuit 1615 is arranged between the input end of the first display screen 210 and the output end of the first backlight drive signal control circuit 1612. The first voltage stabilizing circuit 1615 stabilizes the power supply voltage adjusted by the first backlight drive signal control circuit 1612 to output it to the first display screen 210; the second backlight circuit 162 includes a second voltage stabilizing circuit 1625, and the second voltage stabilizing circuit 1625 is arranged between the input end of the second display screen 220 and the output end of the second backlight drive signal control circuit 1622. The second voltage stabilizing circuit 1625 stabilizes the power supply voltage adjusted by the second backlight drive signal control circuit 1622 to output it to the second display screen 220.

[0044] Furthermore, the first voltage-stabilizing circuit 1615 includes a first double magnetic bead BL1 and a first voltage-stabilizing diode DL1, the input end of the first double magnetic bead BL1 is connected between the output end of the first backlight drive signal control circuit 1612 and the output end of the power input circuit 170, and the output end is connected to the input end of the first display screen 210 through the first voltage-stabilizing diode DL1; the second voltage-stabilizing circuit 1625 includes a second double magnetic bead BL2 and a second voltage-stabilizing diode DL2, the input end of the second double magnetic bead BL2 is connected between the output end of the second backlight drive signal control circuit 1622 and the output end of the power input circuit 170, and the output end is connected to the input end of the second display screen 220 through the second voltage-stabilizing diode DL2.

[0045] In this embodiment, both backlight circuits adopt a dual magnetic bead and dual voltage regulator diode design so that the light bar of the backlight load can provide a stable voltage, ensuring that the screen will not flash black due to voltage instability under low voltage conditions.

[0046] Embodiment 6:

[0047] As the sixth embodiment of the present application, it is a further improvement on any of the above embodiments. The display driver board 100 also includes a power interface, the power input circuit 170 includes a power chip 171 and a power voltage switching circuit 172, the power chip 171 receives the backlight enable signal BL_EN of the main control module 130, and controls the power voltage switching circuit 172 to convert the input power voltage into the working voltage of the first display screen 210 and the second display screen 220; the power voltage switching circuit 172 includes a first transistor Q1, a first diode D1, a third resistor R3, a fourth resistor R4, a third switch tube T3, a second diode D2 and a third capacitor C3; the control end of the first transistor Q1 is connected to the main control module 130, the output end is grounded, and the input end is connected to the first diode D1, the third resistor R3 and the fourth resistor R4. One end of the third resistor R3 is connected to the fourth resistor R4, and the other end is connected to the control end of the third switch tube T3. The input end of the first diode D1 is connected to the input end of the first transistor Q1, and the output end is connected to the control end of the third switch tube T3. One end of the fourth resistor R4 is connected to the input end of the first transistor Q1, and one end is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively. The output end of the second diode D2 is connected to the input end of the third switch tube T3, and the input end is connected to the output end of the third switch tube T3. The input end of the third switch tube T3 is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively, and the output end is connected to the input end of the first display screen 210 and the second display screen 220. The third capacitor C3 is connected between the control end and the input end of the third switch tube T3.

[0048] In this embodiment, the main control module 130 sends a backlight enable signal BL_EN, which is used to control the power supply voltage switching circuit 172; the power supply chip 171 starts working after receiving the backlight enable signal BL_EN from the main control module 130; the power supply voltage switching circuit 172 converts the input power supply voltage into a voltage suitable for the operation of the first display screen 210 and the second display screen 220 according to the received backlight enable signal BL_EN; the third capacitor C3 is connected between the control end and the input end of the third switch tube T3, and is used to stabilize the voltage change during the switching process, reduce noise interference, and adjust the voltage power-on timing on the display screen; when the 5V voltage input from the first voltage input end is selected, the corresponding 0 ohm resistor is powered on, and at this time the third capacitor C3 selects 0.1UF, and when the 12V voltage input from the second voltage input end is selected, the corresponding 0 ohm resistor is powered on, and at this time the third capacitor C3 selects 1UF to ensure switching between voltages and avoid mutual interference.

[0049] Embodiment 7:

[0050] like Figure 7 As shown, the present embodiment discloses a display device 200, wherein the display device 200 includes a first display screen 210, a second display screen 220, and a display driver board 100 as described in any of the above embodiments, wherein the display driver board 100 receives a signal source signal input from the outside and converts it into a first screen image driving signal and a second screen image driving signal, which are output to the first display screen 210 and the second display screen 220, and the main control module 130 controls the dual backlight circuit 160 to generate a corresponding backlight driving signal, which is output to the first display screen 210 and the second display screen 220 through the first output interface 140 and the second output interface 150, respectively, to control the backlight display of the first display screen 210 and the second display screen 220.

[0051] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[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 driver board, characterized in that: The display driving board includes a first input interface, a second input interface, a main control module, a first output interface, a second output interface and a dual backlight circuit; the input end of the main control module is connected to the first input interface and the second input interface respectively, and the output end of the main control module is connected to the first output interface, the second output interface and the dual backlight circuit respectively; The dual backlight circuit comprises a first backlight circuit and a second backlight circuit, wherein the input end of the first backlight circuit is connected to the output end of the main control module, and the output end is connected to the first output interface, and the input end of the second backlight circuit is connected to the output end of the main control module, and the output end is connected to the second output interface; Among them, the first input interface and the second input interface receive different signal source signals, the main control module converts the signal source signal received by the first input interface or the second input interface into a first screen picture driving signal and a second screen picture driving signal and outputs them to the first display screen and the second display screen respectively through the first output interface and the second output interface, the first backlight circuit and the second backlight circuit receive the backlight enable signal output by the main control module to generate a corresponding backlight driving signal and output them to the first display screen and the second display screen respectively through the first output interface and the second output interface to control the backlight brightness display of the first display screen and the second display screen.

2. The display driver board according to claim 1, characterized in that: The display driver board includes a power input circuit, the first backlight circuit includes a first backlight chip and a first backlight drive signal control circuit, the first backlight chip is connected to the main control module and the power input circuit, and receives the backlight enable signal and the backlight digital-to-analog conversion signal output by the main control module, outputs a first current backlight drive signal to the first display screen, and outputs a first control signal to control the switch of the first backlight drive signal control circuit to control the voltage input from the power input circuit to the first display screen; The second backlight circuit includes a second backlight chip and a second backlight drive signal control circuit, the second backlight chip is connected to the main control module and the power input circuit, receives the backlight enable signal and the backlight digital-to-analog conversion signal output by the main control module, outputs a second current backlight drive signal to the second display screen, and outputs a second control signal to control the switch of the second backlight drive signal control circuit to control the voltage input from the power input circuit to the second display screen; Among them, the current magnitudes of the first current backlight driving signal and the second current backlight driving signal are equal, the first control signal controls the switch of the first backlight driving signal control circuit to control the voltage input from the power input circuit to the first display screen to be equal to the voltage input from the power input circuit to the second display screen by the second control signal.

3. The display driving board according to claim 2, characterized in that: The first backlight driving signal control circuit comprises a first switch tube, wherein the control end of the first switch tube is connected to the first backlight chip, the input end is grounded, and the output end is connected between the output end of the power input circuit and the input end of the first display screen; The second backlight driving signal control circuit comprises a second switch tube, the control end of the second switch tube is connected to the second backlight chip, the input end is grounded, and the output end is connected between the output end of the power input circuit and the input end of the second display screen; The first switch tube and the second switch tube are of the same model, and are both MOS tubes that are turned on at a high level and turned off at a low level.

4. The display driving board according to claim 2, characterized in that: The first backlight circuit includes a first current regulating unit, which is arranged between the output end of the first backlight chip and the input end of the first display screen, and the first current regulating unit regulates the minimum value of the current input to the first display screen to 5%-8% of the maximum value of the current; The second backlight circuit includes a second current regulating unit, which is arranged between the output end of the second backlight chip and the input end of the second display screen, and the second current regulating unit regulates the minimum value of the current input to the second display screen to 5%-8% of the maximum value of the current; The first current regulating unit includes a first adjustable resistor, the second current regulating unit includes a second adjustable resistor, and the adjustable resistance range of the first adjustable resistor is the same as that of the second adjustable resistor.

5. The display driving board according to claim 2, characterized in that: The first backlight circuit includes a first anti-interference circuit, one end of which is connected to the first backlight chip and one end is grounded; the first anti-interference circuit includes a first capacitor and a first resistor, one end of which is grounded and the other end is connected to the first backlight chip through the first capacitor; The second backlight circuit includes a second anti-interference circuit, one end of which is connected to the second backlight chip and one end is grounded; the second anti-interference circuit includes a second capacitor and a second resistor, one end of which is grounded and the other end is connected to the second backlight chip through the second capacitor; The resistance values ​​of the first resistor and the second resistor are equal, and the capacitance values ​​of the first capacitor and the second capacitor are the same.

6. The display driving board according to claim 2, characterized in that: The first backlight circuit includes a first voltage stabilizing circuit, which is arranged between an input end of the first display screen and an output end of the first backlight driving signal control circuit, and stabilizes the power supply voltage adjusted by the first backlight driving signal control circuit to output to the first display screen; The second backlight circuit includes a second voltage stabilizing circuit, which is arranged between the input end of the second display screen and the output end of the second backlight drive signal control circuit. The second voltage stabilizing circuit stabilizes the power supply voltage adjusted by the second backlight drive signal control circuit to output it to the second display screen.

7. The display driving board according to claim 3, characterized in that: The first backlight driving signal control circuit further includes a first voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the control end of the first switch tube, and the other end is connected to the input end of the first switch tube; The second backlight driving signal control circuit further includes a second voltage-dividing resistor, one end of the second voltage-dividing resistor is connected to the control end of the second switch tube, and the other end of the second voltage-dividing resistor is connected to the input end of the second switch tube.

8. The display driving board according to claim 6, characterized in that: The first voltage stabilizing circuit includes a first double magnetic bead and a first voltage stabilizing diode, the input end of the first double magnetic bead is connected between the output end of the first backlight driving signal control circuit and the output end of the power input circuit, and the output end is connected to the input end of the first display screen through the first voltage stabilizing diode; The second voltage stabilizing circuit includes a second double magnetic bead and a second voltage stabilizing diode, the input end of the second double magnetic bead is connected between the output end of the second backlight drive signal control circuit and the output end of the power input circuit, and the output end is connected to the input end of the second display screen through the second voltage stabilizing diode.

9. The display driving board according to claim 2, characterized in that: The display driver board also includes a power interface, the power input circuit includes a power chip and a power voltage switching circuit, the power chip receives the backlight enable signal of the main control module, and controls the power voltage switching circuit to convert the input power voltage into the working voltage of the first display screen and the second display screen; The power supply voltage switching circuit includes a first triode, a first diode, a third resistor, a fourth resistor, a third switch tube, a second diode and a third capacitor; the control end of the first triode is connected to the main control module, the output end is grounded, and the input end is connected to the first diode, the third resistor and the fourth resistor. One end of the third resistor is connected to the fourth resistor, and the other end is connected to the control end of the third switch tube. The input end of the first diode is connected to the input end of the first triode, and the output end is connected to the control end of the third switch tube. One end of the fourth resistor is connected to the input end of the first triode, and one end is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively. The output end of the second diode is connected to the input end of the third switch tube, and the input end is connected to the output end of the third switch tube. The input end of the third switch tube is connected to the first voltage input end and the second voltage input end through two 0 ohm resistors respectively, and the output end is connected to the input end of the first display screen and the second display screen. The third capacitor is connected between the control end and the input end of the third switch tube.

10. A display device, characterized in that: The display device includes a first display screen, a second display screen, and a display driver board as described in any one of claims 1 to 9, wherein the display driver board receives a signal source input from the outside and converts it into a first screen picture driving signal and a second screen picture driving signal, and outputs it to the first display screen and the second display screen, and controls the dual backlight circuit to generate a corresponding backlight driving signal through a main control module, and outputs it to the first display screen and the second display screen through a first output interface and a second output interface, respectively, to control the backlight display of the first display screen and the second display screen.

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