Screen socket board switching method

Abstract

The invention provides a screen socket board switching method. The method comprises the following steps: pasting a switching board; the board-mounted adapter plate is used as a surface-mounted device and is welded to the mainboard through an SMT technology, one side of the board-mounted adapter plate is provided with a universal interface electrically connected with the mainboard, and the other side of the board-mounted adapter plate is provided with a screen end interface connected with a display screen end; a board-mounted adapter board with a standardized signal array is welded on a mainboard, functional recombination logic of standardized 110 pins is adopted, and equal-length wiring and 100-ohm impedance matching for point-to-point differential signals are matched, so that the signal integrity of ultra-high-definition video data in a cross-board transmission process is remarkably enhanced, high-frequency electromagnetic interference is inhibited, and the transmission efficiency of the ultra-high-definition video data is improved. And secondly, by establishing a mapping relation between the dynamic gamma bias voltage and different screen factory pin definitions in the adapter plate, the mainboard can accurately compensate the gray scale brightness characteristics of panels of various brands, and the consistency of pictures is improved.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal displays (LCDs), and more particularly to a method for connecting a screen socket board. Background Technology

[0002] Currently, the pin definitions for XB board sockets of LCD screen manufacturers are not standardized. The pin definitions are mainly divided into the number of pins (60 pins, 68 pins, 96 pins) and the allocation of pin electrical characteristics. The motherboard's onboard TCONLESS solution can achieve the ultimate cost. Due to the inconsistent socket definitions of various screen manufacturers, it has become an industry problem to use a single motherboard PCB to be compatible with screens from all manufacturers.

[0003] Traditional motherboards and screen socket adapters use a 1+1 method, meaning the motherboard has one PCB and the adapter has one PCB. Both PCBs define sockets with a certain number of pins, and the sockets on the two PCBs are connected by FFC cables. The disadvantages of the 1+1 method are: 1. It is not suitable for compact structural designs and cannot be assembled; 2. The two FFC sockets and FFC cables bring additional costs; 3. The two PCBs need to be debugged separately, which increases debugging costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a screen socket board conversion method.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a screen socket board adapter method, comprising: attaching an adapter board to the board; The board mount adapter board is a surface mount device that is soldered to the motherboard using SMT technology. One side of the board mount adapter board is provided with a universal interface that is electrically connected to the motherboard, and the other side of the board mount adapter board is provided with a screen interface that is connected to the display screen. The universal interface includes a standardized signal array consisting of 110 pins. The standardized signal array reorganizes the logic board signals to form a unified interface definition covering power distribution, timing control, multiple differential signals, and grayscale correction voltage. This allows the motherboard to achieve electrical logic matching with display screens with different pin definitions and numbers by replacing the board-mount adapter boards with different screen interfaces.

[0006] Preferably, pins 27 to 62 in the standardized signal array are defined as point-to-point differential signal areas. The point-to-point differential signal areas adopt an equal-length wiring structure that is guided from the motherboard to the screen interface, and the point-to-point differential signal areas meet 100-ohm impedance matching on the PCB layer of the board-mounted adapter board.

[0007] Preferably, pins 73 to 86 in the standardized signal array are defined as grayscale correction voltage areas. The grayscale correction voltage areas receive dynamic gamma bias voltage from the motherboard and are mapped to the corresponding grayscale control pins in the screen interface through internal traces to compensate for the differences in brightness characteristics of different display screens.

[0008] Preferably, pins 91 to 98 in the standardized signal array are defined as the analog power supply area, which includes a basic analog power supply voltage and a high-voltage analog power supply voltage. The analog power supply area conducts the drive current provided by the motherboard to the screen interface through a large copper-clad area.

[0009] Preferably, the pads of the board mount adapter are provided with a tin-dip layer, which is used to enhance the wettability between the universal interface and the motherboard pads during full reflow soldering, so as to eliminate the cold solder stress of the board mount adapter during SMT assembly.

[0010] Preferably, the physical dimensions of the board mount adapter are set to 20mm × 90mm, and the mass distribution of the board mount adapter meets the vacuum suction threshold of the SMT pick-and-place machine nozzle. The visual feature points on the surface of the board mount adapter match the camera shooting and positioning accuracy of the SMT pick-and-place machine.

[0011] Preferably, the screen interface is selected from any one of 60PIN, 68PIN, or 96PIN connectors, depending on the specifications of the display screen.

[0012] Compared with existing technologies, the beneficial effects of this invention include: by soldering a board-mount adapter board with a standardized signal array onto the motherboard, using standardized 110-pin functional reconfiguration logic, and combining equal-length wiring for point-to-point differential signals with 100-ohm impedance matching, the signal integrity of ultra-high-definition video data during cross-board transmission is significantly enhanced, high-frequency electromagnetic interference is suppressed, and the image display is free from screen tearing or flickering. Secondly, by establishing a mapping relationship between dynamic gamma bias voltage and pin definitions of different panel manufacturers inside the adapter board, the motherboard can accurately compensate for the grayscale brightness characteristics of panels from different brands, thereby improving the consistency of the image. Attached Figure Description

[0013] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The diagram schematically illustrates a system block diagram of a screen socket board conversion method according to an embodiment of the present invention.

[0014] Figure 2The diagram schematically illustrates the interface definition between the BOE screen board adapter board and the motherboard according to an embodiment of the present invention.

[0015] Figure 3 The diagram illustrates the wiring definition between the BOE screen board adapter and the BOE screen according to an embodiment of the present invention.

[0016] Figure 4 The diagram schematically illustrates the interface definition between the CHOT58 screen board adapter board and the motherboard according to an embodiment of the present invention.

[0017] Figure 5 The diagram illustrates the wiring definition between the CHOT58 screen board adapter and the BOE screen according to an embodiment of the present invention.

[0018] Figure 6 The diagram schematically illustrates the interface definition between the CSOT screen board adapter board and the motherboard according to an embodiment of the present invention.

[0019] Figure 7 The diagram illustrates the wiring definition between the CSOT screen board adapter and the BOE screen according to an embodiment of the present invention. Detailed Implementation

[0020] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0021] Example 1, referring to Figures 1-7 This invention relates to a circuit for a screen socket board adapter.

[0022] By defining an SMT-compatible board adapter, the motherboard can achieve compatibility with screens from different manufacturers by replacing different adapter boards.

[0023] The board mount adapter is defined as a surface mount device in physical form, with a size of 20mm×90mm. This specification can not only accommodate various screen end interfaces (JET1) such as 1×60, 2×60, 1×68, 2×68 and 1×96PIN, but also precisely match the shooting and positioning requirements of the SMT pick and place machine camera and the load threshold of the nozzle, ensuring the high efficiency of automated production.

[0024] To further ensure soldering reliability and eliminate the risk of cold solder joints during the SMT process, the PCB pads of the board mount adapter are pre-treated with tin dipping during the processing stage, which makes them exhibit excellent wettability in the full reflow soldering environment.

[0025] During this process, the surface mount adapter board is directly coupled to the motherboard via its bottom universal signal adapter interface (XP1). The surface mount socket adapter board connects to the motherboard's universal interface, which is defined as 110 pins and has the following functions: The Universal Signal Adapter Interface (XP1) uses a standardized array logic with 110 pins, which enables high-density signal integration and functional partitioning.

[0026] Specifically, under dynamic operating conditions, the point-to-point differential signal area consisting of pins 27 to 62 is responsible for transmitting high-speed image data. By performing 100-ohm impedance matching on the bright yellow differential pairs in the PCB layout, the integrity of the ultra-high-definition video signal is ensured. At the same time, the grayscale correction voltage area defined by pins 73 to 86 guides the 14 sets of dynamic gamma bias voltages (GM1-GM14) generated by the motherboard to the screen interface (JET1), thereby precisely adjusting the deflection angle of the liquid crystal molecules according to the physical characteristics of the connected panel.

[0027] In the overall workflow, the motherboard, as the core control unit, inputs the raw data stream and driving voltage to the panel adapter board through the general signal adapter interface XP1. The input signal first passes through the power distribution area, where the AVDD basic analog power supply and HAVDD semi-analog power supply provide the necessary power support for the panel source drive, while the VGH and VGL voltages work together to drive the gate to control the switching of the TFT. Under this logic framework, the row scan clock signals such as CK1-CK12 and the STV frame start signal act synchronously, guiding the electrical signal from the motherboard through the internal wiring of the adapter board to be accurately mapped to the socket pins defined by the specific panel manufacturer. Finally, the signal after being mapped at the physical level by the panel adapter board is output from the panel interface (JET1) to the LCD panel, realizing the closed-loop conversion from the general signal of the motherboard to the specific protocol of the heterogeneous panel, and solving the production material preparation problem caused by the inconsistent definition of LCD panel sockets.

[0028] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A method for connecting a screen socket board, characterized in that, include: Adapter board; The board mount adapter board is a surface mount device that is soldered to the motherboard using SMT technology. One side of the board mount adapter board is provided with a universal interface that is electrically connected to the motherboard, and the other side of the board mount adapter board is provided with a screen interface that is connected to the display screen. The universal interface includes a standardized signal array consisting of 110 pins. The standardized signal array reorganizes the logic board signals to form a unified interface definition covering power distribution, timing control, multiple differential signals, and grayscale correction voltage. This allows the motherboard to achieve electrical logic matching with display screens with different pin definitions and numbers by replacing the board-mount adapter boards with different screen interfaces.

2. The screen socket board adapter method according to claim 1, characterized in that, Pins 27 to 62 in the standardized signal array are defined as point-to-point differential signal areas. The point-to-point differential signal areas adopt an equal-length wiring structure that is guided from the motherboard to the screen interface, and the point-to-point differential signal areas meet 100-ohm impedance matching on the PCB layer of the board-mounted adapter board.

3. The screen socket board adapter method according to claim 2, characterized in that, Pins 73 to 86 in the standardized signal array are defined as grayscale correction voltage areas. These grayscale correction voltage areas receive dynamic gamma bias voltage from the motherboard and are mapped to the corresponding grayscale control pins in the screen interface through internal traces to compensate for differences in brightness characteristics between different display screens.

4. The screen socket board adapter method according to claim 3, characterized in that, Pins 91 to 98 in the standardized signal array are defined as the analog power supply area, which includes a basic analog power supply voltage and a high-voltage analog power supply voltage. The analog power supply area conducts the drive current provided by the motherboard to the screen interface through a large copper-clad area.

5. The screen socket board adapter method according to claim 1, characterized in that, The pads of the board mount adapter are provided with a tin-dip layer. The tin-dip layer is used to enhance the wettability between the universal interface and the motherboard pads during full reflow soldering, so as to eliminate the poor soldering stress of the board mount adapter during SMT assembly.

6. The screen socket board adapter method according to claim 1, characterized in that, The physical dimensions of the board mount adapter are set to 20mm × 90mm, and the mass distribution of the board mount adapter meets the vacuum suction threshold of the SMT pick-and-place machine nozzle. The visual feature points on the surface of the board mount adapter match the camera shooting and positioning accuracy of the SMT pick-and-place machine.

7. The screen socket board adapter method according to claim 1, characterized in that, The screen interface is selected from any one of 60PIN, 68PIN, or 96PIN connectors, depending on the specifications of the display screen.

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