Printed circuit board assembly, display module, display device, and display control method

Abstract

The application provides a printed circuit board assembly, a display module, a display device and a display control method. The printed circuit board assembly comprises: a first printed circuit board assembly used for binding connection with a driving circuit on a display panel, wherein the first printed circuit board assembly comprises a storage unit, and a target VCOM value of the display panel after debugging is stored in the storage unit; and a second printed circuit board assembly binding connected with the first printed circuit board assembly, comprising a TCON circuit and a P-gamma circuit, wherein the TCON circuit is used for reading the target VCOM value from the storage unit and writing the target VCOM value into the P-gamma circuit, so that the P-gamma circuit controls the display of the display panel according to the target VCOM value. Since the target VCOM value is the optimal VCOM value of the display panel after debugging, the flicker problem of the display panel can be avoided, and the display effect is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a printed circuit board assembly, a display module, a display device, and a display control method. Background Art

[0002] The printed circuit board assembly (PCBA) for large-size display modules is typically XC-separated, meaning the PCB assembly consists of several XPCBAs (X Printed Circuit Board Assemblies) and one CPCBA (Central Printed Circuit Board Assembly). The CPCBA used with the display panel during production may not be the same as the one used with the display panel during shipment. This can cause the VCOM (common voltage) value stored in the CPCBA used with the display panel to be suboptimal, resulting in higher flicker values ​​on the display panel. Flicker is particularly problematic for large-size display products.

[0003] To address this issue, a common approach is to test the VCOM values ​​corresponding to the optimal flicker on 20 to 30 display panels, then take the average of these VCOM values ​​as the final VCOM value, and use this average value for all display panels. This approach can result in excessive flicker on some display panels, failing to meet customer requirements. Summary of the Invention

[0004] Embodiments of the present invention provide a printed circuit board assembly, a display module, a display device, and a display control method, which are used to solve the problem that the VCOM value stored in the CPCBA used with the display panel in the existing XC separated display module may not be the optimal VCOM value of the display panel, and the flicker cannot be accurately adjusted.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a printed circuit board assembly, comprising:

[0007] a first printed circuit board assembly, configured to be bound and connected to a driving circuit on a display panel, the first printed circuit board assembly comprising a storage unit, wherein the storage unit stores a debugged target VCOM value of the display panel;

[0008] The second printed circuit board assembly is bound and connected to the first printed circuit board assembly, and includes a TCON circuit and a P-gamma circuit. The TCON circuit is used to read the target VCOM value from the storage unit and write the target VCOM value into the P-gamma circuit.

[0009] Optionally, the storage unit further stores a lookup table, wherein the lookup table includes a mapping relationship between the VCOM value stored in the storage unit and the VCOM value recognizable by the P-GAMMA circuit;

[0010] The TCON circuit is further configured to read the lookup table, and convert the target VCOM value into a VCOM value recognizable by the P-gamma circuit based on the read lookup table and the target VCOM value, and write the converted target VCOM value into the P-gamma circuit.

[0011] Optionally, the TCON circuit communicates with the storage unit via a serial peripheral device interface protocol;

[0012] and / or,

[0013] The TCON circuit communicates with the P-gamma circuit via an integrated circuit bus protocol.

[0014] Optionally, the first printed circuit board assembly is an XPCBA, and the second printed circuit board assembly is a CPCBA.

[0015] Optionally, the storage unit is a Demura circuit.

[0016] In a second aspect, an embodiment of the present invention provides a display module, comprising a display panel, a driving circuit and a printed circuit board assembly as described in the first aspect above, wherein the driving circuit is respectively connected to the display panel and a first printed circuit board assembly in the printed circuit board assembly.

[0017] In a third aspect, an embodiment of the present invention provides a display device, comprising the display module as described in the second aspect.

[0018] In a fourth aspect, an embodiment of the present invention provides a display control method, including:

[0019] The TCON circuit of the second PCB assembly reads the debugged target VCOM value of the display panel from the storage unit of the first PCB assembly, and writes the target VCOM value into the P-gamma circuit of the second PCB assembly.

[0020] Optionally, writing the target VCOM value into the P-gamma circuit includes:

[0021] The TCON circuit determines whether the target VCOM value is within a preset value range;

[0022] If the target VCOM value is within the preset value range, the target VCOM value is written into the P-gamma circuit.

[0023] Optionally, the display control method further includes:

[0024] If the target VCOM value is not within the preset value range, the operation of writing the target VCOM value into the P-gamma circuit is abandoned.

[0025] In an embodiment of the present invention, a debugged target VCOM value of a display panel is stored in a first PCB assembly. When a second PCB assembly is bound and connected to the first PCB assembly and powered on, a TCON circuit of the second PCB assembly reads the target VCOM value from the first PCB assembly and writes the target VCOM value into a P-gamma circuit of the second PCB assembly. This allows the P-gamma circuit to control the display of the display panel based on the written target VCOM value. Because the target VCOM value is the optimal VCOM value of the display panel after debugging, flickering of the display panel can be avoided, thereby improving the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 Schematic diagram of the structure of the XC separated display module according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a printed circuit board assembly according to an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of signal ports of a TCON circuit according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of signal ports of a demura circuit in an embodiment of the present invention;

[0031] Figure 5 This is a flow chart of a display control method according to an embodiment of the present invention;

[0032] Figure 6Figure 2 is a flowchart of a display control method according to an embodiment of the present application;

[0033] Figure 7 Figure 4 is a diagram of address correspondence of a flash memory of a Demura circuit according to an embodiment of the present application;

[0034] Figure 8 Figure 5 is a diagram of setting of a VCOM value in a P-gamma circuit according to an embodiment of the present application;

[0035] Figure 9 Figure 6 is a diagram of a method of writing a target VCOM value into a P-gamma circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] Reference will be made to Figure 1 , Figure 1 Figure 1 is a diagram of a structure of a display module according to an embodiment of the present application. In the diagram, X is an XPCBA (a printed circuit board assembly located on an X axis), C is a CPCBA (a central printed circuit board assembly), and 01 is an XPCBA, 02 is a CPCBA, and 03 is a display panel. Figure 1 As can be seen from Figure 1, the printed circuit board assembly of the XC-separated display module is composed of a plurality of XPCBAs and a CPCBA, wherein, Figure 1 01 in Figure 1 is an XPCBA, 02 is a CPCBA, and 03 is a display panel. The XPCBA usually includes capacitors, resistors, and wiring and other components of the printed circuit board assembly, and the CPCBA usually includes a TCON (Timing Controller) circuit (TCON IC) and a P-gamma circuit (P-gamma IC), etc. The main function of the TCON circuit is to convert an image signal and a clock signal at an input end into a signal recognizable by a gate drive circuit and a source drive circuit of a display panel, so that the display panel can perform Gate line scanning, drive data input, etc. according to the signal, and thus the display panel can display normally. The main function of the P-gamma circuit is to store Gamma values and VCOM values, and to generate various reference voltages required by the display panel.

[0038] The shipment method of the XC-separated display module is to ship the display panel with XPCBA and CPCBA separately. This will result in the VCOM value stored in the CPCBA shipped with the display panel may not be the optimal VCOM value of the display panel, resulting in a relatively large flicker value of the display panel.

[0039] To solve the above problems, please refer to Figure 2 , an embodiment of the present invention provides a printed circuit board assembly, comprising:

[0040] A first printed circuit board assembly 1, configured to be bound and connected to a driving circuit on a display panel 3, wherein the first printed circuit board assembly 1 comprises a storage unit 11, wherein the storage unit 11 stores a debugged target VCOM value of the display panel 3;

[0041] The second printed circuit board assembly 2 is bound and connected to the first printed circuit board assembly 1, and includes a TCON circuit 21 and a P-gamma circuit 22. The TCON circuit 21 is used to read the target VCOM value from the storage unit 11 and write the target VCOM value into the P-gamma circuit 22.

[0042] In an embodiment of the present invention, a debugged target VCOM value of the display panel 3 is stored in the first PCB assembly 1. When the second PCB assembly 2 is bound and connected to the first PCB assembly 1 and powered on, the TCON circuit 21 of the second PCB assembly 2 reads the target VCOM value from the first PCB assembly 1 and writes the target VCOM value into the P-gamma circuit 22 of the second PCB assembly 2. This allows the P-gamma circuit 22 to control the display of the display panel 3 based on the written target VCOM value. Because the target VCOM value is the optimal VCOM value of the display panel 3 after debugging, the optimal VCOM value of the display panel 3 can be maintained regardless of which second PCB assembly 2 is installed. This can avoid flickering of the display panel 3 and improve the display effect.

[0043] In some embodiments, optionally, the printed circuit board assembly includes at least one first printed circuit board assembly 1 and one second printed circuit board assembly 2 . Figure 2 In the illustrated embodiment, the printed circuit board assembly includes two first printed circuit board assemblies 1 and one second printed circuit board assembly 2 .

[0044] Optionally, the display panel 3 has multiple driving circuits. Figure 2In the embodiment shown, the display panel 3 has 12 drive circuits, namely XD1 to XD12. Some of the drive circuits (such as XD1 to XD6) are connected to one first printed circuit board assembly 1, and another portion of the drive circuits (such as XD7 to XD12) are connected to another first printed circuit board assembly 1.

[0045] Since the VCOM value (e.g., a hexadecimal digital signal) stored in the storage unit 11 may not be recognized by the P-gamma circuit 22 (for example, the P-gamma circuit 22 can only recognize a binary digital signal), it is also necessary to convert the VCOM value stored in the storage unit 11 into a target VCOM value that can be recognized by the P-gamma circuit 22. In some embodiments, optionally, the storage unit 11 further stores a lookup table (LUT), wherein the lookup table includes a mapping relationship between the VCOM value stored in the storage unit and the VCOM value that can be recognized by the P-GAMMA circuit; the TCON circuit 21 is further configured to read the lookup table, and based on the read lookup table and the target VCOM value, convert the target VCOM value into a VCOM value that can be recognized by the P-gamma circuit, and write the converted target VCOM value into the P-gamma circuit 22.

[0046] In some embodiments, optionally, writing the converted target VCOM value into the P-gamma circuit 22 includes: writing the converted target VCOM value into the P-gamma circuit 22, and recording the writing time of the converted target VCOM value, so that the P-gamma circuit 22 can use the target VCOM value at the latest time to control the display of the display panel 3.

[0047] In some embodiments, optionally, writing the converted target VCOM value into the P-gamma circuit 22 includes replacing a VCOM value stored in the P-gamma circuit 22 with the converted target VCOM value. In this manner, the P-gamma circuit 22 always stores a single VCOM value, which reduces the storage capacity requirements of the P-gamma circuit 22.

[0048] In some embodiments, optionally, the TCON circuit 21 communicates with the storage unit 11 via a serial peripheral interface (SPI) protocol.

[0049] In some embodiments, optionally, the TCON circuit 21 communicates 22 with the P-gamma circuit via an Inter-Integrated Circuit (IIC) protocol.

[0050] In some embodiments, optionally, the first printed circuit board assembly 1 is an XPCBA, and the second printed circuit board assembly 2 is a CPCBA.

[0051] In some embodiments, the storage unit 11 may optionally be a demura circuit. Demura is a technology that eliminates mura in a display device, ensuring uniform brightness. The demura circuit in the embodiments of the present invention can be used to eliminate horizontal and / or vertical mura. Using the demura circuit to store the debugged VCOM value does not increase costs.

[0052] Optionally, the debugged VCOM value is stored in a Demura flash memory of the Demura circuit. Flash memory is a non-volatile memory that can retain data for a long time even without current supply.

[0053] Please refer to Figure 3 and Figure 4 , Figure 3 Schematic diagram of signal ports of a TCON circuit according to an embodiment of the present invention. Figure 4 The signal port diagram of the Demura circuit in the embodiment of the present invention is shown. The TCON circuit and the Demura circuit are connected through the SPI signal port (such as Figure 3 and Figure 4 When the TCON circuit is powered on, the debugged VCOM value in the demura circuit is read through the SPI signal port, and the debugged VCOM value is written into the P-gamma circuit through the IIC protocol to maintain the optimal VCOM of the display panel.

[0054] In this embodiment of the present invention, during the production phase, the debugged VCOM value is stored in the demura circuit. When the display panel is connected to different CPCBAs, the TCON circuit on the CPCBA reads the debugged VCOM value from the demura circuit and writes it to the P-gamma circuit, ensuring that the display panel maintains the optimal VCOM regardless of which CPCBA is used.

[0055] An embodiment of the present invention also provides a display module, including a display panel, a driving circuit and a printed circuit board assembly, wherein the printed circuit board assembly is the printed circuit board assembly described in any of the above embodiments, and the driving circuit is respectively connected to the display panel and the first printed circuit board assembly in the printed circuit board assembly.

[0056] Optionally, the display panel in the embodiment of the present invention is a liquid crystal display panel, including an array substrate and a color filter substrate.

[0057] Optionally, the display module in the embodiment of the present invention may further include a backlight module for providing backlight to the display panel.

[0058] An embodiment of the present invention further provides a display device, comprising the above-mentioned display module.

[0059] Please refer to Figure 5 , an embodiment of the present invention further provides a display control method, comprising:

[0060] Step S1: The TCON circuit of the second PCB assembly reads the debugged target VCOM value of the display panel from the storage unit of the first PCB assembly, and writes the target VCOM value into the P-gamma circuit of the second PCB assembly.

[0061] In an embodiment of the present invention, a debugged target VCOM value of a display panel is stored in a first PCB assembly. When a second PCB assembly is bound and connected to the first PCB assembly and powered on, a TCON circuit of the second PCB assembly reads the target VCOM value from the first PCB assembly and writes the target VCOM value into a P-gamma circuit of the second PCB assembly. This allows the P-gamma circuit to control the display of the display panel based on the written target VCOM value. Because the target VCOM value is the optimal VCOM value of the display panel after debugging, flickering of the display panel can be avoided, thereby improving the display quality.

[0062] In some embodiments, optionally, writing the target VCOM value into the P-gamma circuit includes:

[0063] Step S11: the TCON circuit determines whether the target VCOM value is within a preset value range;

[0064] Step S12: If the target VCOM value is within the preset value range, write the target VCOM value into the P-gamma circuit.

[0065] In some embodiments, optionally, the display control method further includes:

[0066] Step S13: If the target VCOM value is not within the preset value range, abandoning the operation of writing the target VCOM value into the P-gamma circuit.

[0067] In some embodiments, the display control method of the present invention may optionally further include detecting flicker data of the display panel, and adjusting the VCOM value of the display panel based on the detected flicker data to obtain a adjusted VCOM value of the display panel. The above adjustment may be performed once or multiple times to obtain an optimal VCOM value for the display panel.

[0068] Please refer to Figure 6 In an embodiment of the present invention, a color analyzer, such as a CA310 device, can be used to detect flicker on a display panel. The color analyzer sends the detected flicker data to a precision demura device. The precision demura device, based on the detected flicker data, adjusts the VCOM value in the P-gamma circuit in the CPCBA via the IIC protocol to obtain a adjusted VCOM value. The P-gamma circuit then controls the display panel based on the adjusted VCOM value. The color analyzer then detects flicker data again and sends the detected flicker data to the precision demura device. The precision demura device, based on the detected flicker data, adjusts the VCOM value in the P-gamma circuit in the CPCBA via the IIC protocol to obtain a adjusted VCOM value. This process continues until the flicker data detected by the color analyzer meets preset requirements, resulting in a final adjusted VCOM value. The precision demura device writes the final debugged VCOM value into the demura circuit through the SPI protocol.

[0069] When the display panel is connected to a different CPCBA, after power-up, the TCON circuit in the CPCBA reads the LUT and the debugged VCOM value from the Demura circuit on the XPCBA via the SPI protocol. The LUT converts the VCOM value into a target VCOM value recognized by the P-Gamma circuit. The target VCOM value is then written to the P-Gamma circuit via the IIC protocol between the TCON circuit and the P-Gamma circuit. If a different CPCBA is replaced next time, the VCOM value within the P-Gamma circuit in the new CPCBA will be updated using the same method described above. This ensures that the VCOM value stored in the CPCBA corresponds to the display panel and maintains the optimal VCOM value for the display panel.

[0070] The following describes how a storage unit (such as a demura circuit) in an embodiment of the present invention stores a VCOM value.

[0071] Please refer to Figure 7 and Figure 8 , Figure 7 Schematic diagram of the address correspondence relationship of the flash memory of the Demura circuit according to an embodiment of the present invention. Figure 8 FIG. 4 is a schematic diagram of setting the VCOM value in the P-gamma circuit according to an embodiment of the present invention.

[0072] 1) DVR Tuning data value range setting: The DVR Tuning data value range is used to identify the value range in which the VCOM value can be adjusted. The DVR Tuning data value range can be set according to actual conditions. Assume that the value range is 0xFE (6.4V) to 0x70 (7.6V). The precision measurement demura device adjusts the VCOM value to the optimal value through IIC, reads the optimal VCOM value of the display panel, and writes it to 0x1E0005 of the Flash memory.

[0073] 2) Checksum calculation method: VCOM_Checksum = the last two digits (E8+01+C0). E8 and 01 are fixed values, and C0 is the actual value in the register. The adjustable checksum range is defined as 0159 to 01E7. After the precision demura device calculates the checksum value, it writes the checksum value to 0x1E0006 or 0x1E0007 in the Flash memory.

[0074] Different VCOM values ​​correspond to different checksums. After the optimal VCOM value is stored in the demura circuit, a checksum is generated to verify whether the Vcom voltage in the Pgamma IC has been changed to the optimal value.

[0075] In the embodiment of the present invention, the checksum is defined as E8+01+C0, the I2C is E8, the register is 01, and the actual value in the register is C0.

[0076] 3) The TCON circuit reads the VCOM value from the flash memory. If the read VCOM value is not within the DVR Tuningdata value range, the read VCOM value is considered invalid (NG) and the TCON circuit does not write the read VCOM value to the P-Gamma circuit.

[0077] 4) The precision measurement Demura device will fill in FF in the unused Flash memory areas.

[0078] Please refer to Figure 9 , Figure 9 This is a schematic diagram of a method for writing a target VCOM value into a P-Gamma circuit according to an embodiment of the present invention. Once the fixture is connected to the P-Gamma circuit, the VCOM value can be edited and the latest VCOM value can be burned in.

[0079] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A printed circuit board assembly, characterized in that: include: a first printed circuit board assembly, configured to be bound and connected to a driving circuit on a display panel, the first printed circuit board assembly comprising a storage unit, wherein the storage unit stores a debugged target VCOM value of the display panel; The storage unit is a Demura circuit; a second printed circuit board assembly, bound and connected to the first printed circuit board assembly, comprising a TCON circuit and a P-gamma circuit, wherein the TCON circuit is configured to read the target VCOM value from the storage unit and write the target VCOM value into the P-gamma circuit; The debugged target VCOM value is determined by the following method: detecting flicker data and sending it to a demura device; the demura device debugs the VCOM value in the P-gamma circuit based on the detected flicker data; and the P-gamma circuit controls the display of the display panel based on the debugged VCOM value. Flicker data is detected again and sent to the demura device; the demura device debugs the VCOM value in the P-gamma circuit based on the detected flicker data until the detected flicker data meets preset requirements, thereby obtaining a debugged target VCOM value. The demura device then writes the debugged target VCOM value into the demura circuit.

2. The printed circuit board assembly according to claim 1, wherein: The storage unit further stores a lookup table, wherein the lookup table includes a mapping relationship between the VCOM value stored in the storage unit and the VCOM value that can be recognized by the P-GAMMA circuit; The TCON circuit is further configured to read the lookup table, and convert the target VCOM value into a VCOM value recognizable by the P-gamma circuit based on the read lookup table and the target VCOM value, and write the converted target VCOM value into the P-gamma circuit.

3. The printed circuit board assembly according to claim 1, wherein: The TCON circuit communicates with the storage unit via a serial peripheral device interface protocol; and / or, The TCON circuit communicates with the P-gamma circuit via an integrated circuit bus protocol.

4. The printed circuit board assembly according to any one of claims 1 to 3, wherein: The first printed circuit board assembly is an XPCBA, and the second printed circuit board assembly is a CPCBA.

5. A display module, characterized in that: The device comprises a display panel, a driving circuit and a printed circuit board assembly according to any one of claims 1 to 4, wherein the driving circuit is connected to the display panel and a first printed circuit board assembly in the printed circuit board assembly respectively.

6. A display device, characterized in that: Comprising the display module as claimed in claim 5.

7. A display control method, characterized in that: Applied to the printed circuit board assembly according to any one of claims 1 to 4, the method comprises: The TCON circuit of the second PCB assembly reads the debugged target VCOM value of the display panel from the storage unit of the first PCB assembly, and writes the target VCOM value into the P-gamma circuit of the second PCB assembly.

8. The display control method according to claim 7, wherein: Writing the target VCOM value into the P-gamma circuit includes: The TCON circuit determines whether the target VCOM value is within a preset value range; If the target VCOM value is within the preset value range, the target VCOM value is written into the P-gamma circuit.

9. The display control method according to claim 8, wherein: Also includes: If the target VCOM value is not within the preset value range, the operation of writing the target VCOM value into the P-gamma circuit is abandoned.

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