A driving device of a display panel and a display device

Abstract

The application discloses a display panel driving device and a display device, wherein the display panel driving device comprises a control board, at least one control element is arranged on the control board, at least two driving circuit boards, a plurality of driving chips are arranged on the driving circuit boards, at least two first connecting pieces, one end of each first connecting piece is connected with each driving circuit board in one-to-one correspondence, and the other end of each first connecting piece is connected with the control board. The control element and each driving circuit board are directly connected through the first connecting piece, high-speed signals are only transmitted through the wirings in the control element and each driving circuit board, the number of connecting components in a high-speed signal transmission line is reduced, signal attenuation in the transmission line is reduced, and the transmission quality of the high-speed signals is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a driving device and display apparatus for a display panel. Background Technology

[0002] As the demand for display products develops towards larger sizes, higher resolutions, and higher refresh rates, higher requirements are also placed on their driving capabilities. In display devices, control components transmit high-speed signals to the driver chip to meet these requirements. However, the increase in signal rate will bring about signal attenuation. For large-size display devices, the transmission distance of high-speed signals is much greater than that of conventional display devices. In addition, the number of traces for transmitting high-speed signals and the number of connecting components through which high-speed signals pass are also greater. This will lead to problems such as crosstalk and loss of high-speed signals during transmission. Traditional signal transmission structures are difficult to guarantee the transmission quality of high-speed signals in large-size display devices. Summary of the Invention

[0003] This invention provides a driving device and display equipment for a display panel, which can reduce the loss of high-speed signals during transmission and improve the transmission quality of high-speed signals.

[0004] One aspect of the present invention provides a driving device for a display panel, comprising:

[0005] A control board, wherein at least one control element is provided on the control board;

[0006] At least two driving circuit boards, wherein multiple driving chips are disposed on the driving circuit boards;

[0007] At least two first connectors are provided, one end of each first connector is connected to each of the drive circuit boards, and the other end of each first connector is connected to the control board.

[0008] In some embodiments of the present invention, the first connector includes a first connecting line and two first connectors, the two first connectors being located at both ends of the first connecting line; the first connecting line is connected to the drive circuit board and the control element respectively through the two first connectors.

[0009] In some embodiments of the present invention, one of the control elements, two of the drive circuit boards, and two of the first connectors constitute a drive unit; the drive device for the display panel includes two mutually symmetrical drive units;

[0010] The control element in the drive unit is connected to each of the first connectors in the drive unit through the wiring on the control board, and each first connector is connected to one of the drive circuit boards in the drive unit.

[0011] In some embodiments of the present invention, each of the driving circuit boards is arranged along a first direction;

[0012] The first connecting line in the drive unit, near the control element, extends along a second direction, and the first direction and the second direction are orthogonal.

[0013] The first connecting line in the drive unit on the side away from the control element includes a first sub-segment and two second sub-segments. The first sub-segment extends along the first direction, and the second sub-segments extend along the second direction. The two second sub-segments are located at the two ends of the first sub-segment, and the second sub-segments are connected to the first connector.

[0014] In some embodiments of the present invention, the first connecting line is a flexible flat cable.

[0015] In some embodiments of the present invention, the control element is a timing controller, a system-on-a-chip, or a field-programmable gate array;

[0016] The signals transmitted by the first connector include clock-embedded differential signals, TV unified standard interface signals, integrated data stream protocol signals, or China High Speed ​​Protocol interface signals.

[0017] In some embodiments of the present invention, the driving unit further includes:

[0018] The second connector is located on the side of the drive circuit board away from the drive chip, and the second connector is used to connect two adjacent drive circuit boards.

[0019] A third connector is used to connect the drive circuit board near the control element to the control element.

[0020] In some embodiments of the present invention, the second connector includes a second connecting line and two second connectors, wherein the second connecting line is connected to the drive circuit boards on both sides through the two second connectors respectively;

[0021] The third connector includes a third connecting line and two third connectors, the two third connectors being located at both ends of the third connecting line; the third connecting line extends along the second direction, and the third connecting line is connected to the drive circuit board and the control board respectively through the two third connectors.

[0022] In some embodiments of the present invention, the second connecting line is a flexible flat cable or a flexible circuit board; the third connecting line is a flexible flat cable.

[0023] In some embodiments of the present invention, the signals transmitted by the third connector include power signals and timing drive signals.

[0024] In another aspect, the present invention provides a display device, the display device including a display panel and a driving device for any of the above-mentioned display panels, wherein the display panel is electrically connected to the driving device for the display panel.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention provides a driving device and display apparatus for a display panel. The driving device for the display panel includes: a control board with at least one control element; at least two drive circuit boards with multiple drive chips; and at least two first connectors, one end of each first connector being connected to a corresponding drive circuit board, and the other end of each first connector being connected to the control board. By directly connecting the control element and each drive circuit board through the first connectors, high-speed signals are transmitted only through the traces between them, reducing the number of connecting components in the high-speed signal transmission line, which helps to reduce signal attenuation in the transmission line and improve the transmission quality of high-speed signals. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a partial structural diagram of a drive device in related technologies;

[0029] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the driving device provided in an embodiment of the present invention;

[0031] Figure 4 This is a partial structural schematic diagram of the driving device provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0033] Display devices include display panels and driving devices that send driving control signals to the display panels. As the demand for display products develops towards larger sizes, higher resolutions, and higher refresh rates, the driving devices need to transmit high-speed signals to the display panels to achieve high-resolution displays. Taking a 110-inch display panel with 16K resolution and a 60Hz refresh rate as an example, the driving device of the display panel typically uses four horizontally oriented circuit boards to build the driving circuit. A total of 48 driving chips are set on the circuit boards to drive the display panel to emit light. To achieve 16K resolution, each driving chip needs to receive a 3.25Gbps / 2Pair signal.

[0034] However, increasing the signal rate will increase the signal attenuation, especially for large-size display devices, where the transmission line length of high-speed signals is much longer than that of high-speed signals in conventional-size display devices. Therefore, in large-size display devices, the structure of the display panel's driving device determines the transmission quality of high-speed signals.

[0035] Figure 1 This is a partial structural diagram of a drive device in related technologies.

[0036] Figure 1 The diagram illustrates the high-speed signal transmitter and its connection to the receiver on the remote circuit board, as shown below. Figure 1 As shown, a high-speed signal transmission line may include a transmitter 1, two circuit boards, a flexible flat cable 3 (FFC) and a flexible printed circuit 4 (FPC). For ease of description, the two circuit boards are referred to as the first circuit board 21 and the second circuit board 22, respectively. The first circuit board 21 is closer to the transmitter 1 than the second circuit board 22. Multiple receivers 5 are provided on both circuit boards.

[0037] Among them, the transmitting end 1 is used to transmit high-speed signals. FFC3 is connected to the transmitting end 1 and the first circuit board 21 through the connectors 6 at both ends and the internal wiring. FPC4 is connected to the first circuit board 21 and the second circuit board 22 through the connectors 6 at both ends and the internal wiring. Both the first circuit board 21 and the second circuit board 22 are provided with wiring for transmitting high-speed signals. The wiring in the first circuit board 21 and the second circuit board 22 are respectively connected to the receiving end 5 above them. The receiving end 5 is the aforementioned driver chip. The signal received by the receiving end 5 needs to meet certain specifications in order to drive the large-size display panel normally.

[0038] Based on the above connection relationship, for the remote circuit board, the high-speed signal sent by the transmitting end 1 is first transmitted to the first circuit board 21 via FFC3, then transmitted to FPC4 via the traces in the first circuit board 21, then transmitted to the second circuit board 22 via the traces in FPC4, and finally transmitted to the receiving ends 5 above the second circuit board 22 via the traces in the second circuit board 22. The high-speed signal travels a long distance and passes through a large number of connecting components, resulting in significant signal loss. In view of this, this embodiment of the invention provides a driving device and display device for a display panel to reduce the loss of high-speed signals when transmitting to the remote circuit board.

[0039] Figure 2 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention.

[0040] like Figure 2 As shown, the display device includes a driving device 10 and a display panel 20. The driving device 10 is electrically connected to the display panel 20. The driving device 10 can transmit various types of signals, such as high-speed signals, power signals, and timing drive signals, to the display panel 20 to drive the display panel to display images.

[0041] The display panel 20 can be any one of a liquid crystal (LC) display panel, a light-emitting diode (LED) display panel, a micro light-emitting diode (Micro LED) display panel, an organic light-emitting diode (OLED) display panel, or a micro organic light-emitting diode display panel, etc. The embodiments of the present invention are not limited to this.

[0042] This invention relates to a large-size display panel, and designs the structure of the driving device connected to it so that the signal rate received by the display panel can meet the requirements of high resolution and high refresh rate display.

[0043] Figure 3This is a schematic diagram of the structure of the driving device provided in an embodiment of the present invention.

[0044] like Figure 2 and Figure 3 As shown, the drive device 10 includes a control board 100, at least two drive circuit boards 200 and at least two first connectors 310. The control board 100 is provided with at least one control element 110. Each drive circuit board 200 is provided with multiple drive chips 210. One end of each first connector 310 is connected to each drive circuit board 200 in a corresponding manner, and the other end of each first connector 310 is connected to the control board 100.

[0045] Each control element 110 can be connected to the interface on the edge of the control board 100 via wiring on the control board 100. The first connector 310 forms an electrical connection with the control element 110 via the corresponding interface on the edge of the control board 100. Thus, the control element 110 can transmit high-speed signals to each first connector 310, and each first connector 310 then transmits the high-speed signals to the corresponding connected drive circuit board 200. The signals are then transmitted to each drive chip 210 via wiring in the drive circuit board 200. After processing the received signals, the drive chip 210 can drive the display panel to display images.

[0046] In this embodiment of the invention, a first connector is provided for each driving circuit board to build a high-speed signal transmission line. The high-speed signal sent by the control element can be transmitted in groups to each driving circuit board. For driving circuit boards that are far away from the control element, the types of connecting parts in the high-speed signal transmission line are reduced, and the simplification of the transmission line helps to reduce the loss of high-speed signals.

[0047] Furthermore, in this embodiment of the invention, the control element and the remote drive circuit board are directly connected through the first connector, which can reduce the number of traces in the near-end drive circuit board, thereby reducing the number of trace layers in the drive circuit board, simplifying the manufacturing process of the drive circuit board, and reducing the number of traces also helps to reduce signal crosstalk between traces.

[0048] Specifically, the control element 110 on the control board 100 can be one or more of the following devices: Timing Control (TCON), System on Chip (SOC), or Field Programmable Gate Array (FPGA). The control element 110 can send and transmit various signals such as high-speed signals, power signals, and timing drive signals. Among them, the high-speed signals can include one or more of the following signal types: Clock Embedded Differential Signal (CEDS), Unified Standard Interface for TV (USI-T) signal, Integrated Stream Protocol (ISP) signal, or China High-speed Protocol Interface (CHPI) signal. To achieve large-size, high-resolution, and high-refresh-rate display, the high-speed signals sent and transmitted by the control element 110 can reach 3Gbps or more.

[0049] The attenuation of high-speed signals in transmission lines mainly includes attenuation caused by conductor loss and attenuation caused by dielectric material loss. This attenuation can be calculated using the following formula:

[0050]

[0051] Where, α dB α represents the total attenuation per unit length of the line. cond α represents the conductor loss per unit length of a line. diel The dielectric loss per unit length of the trace is represented by W, the trace width by Z0, the characteristic impedance of the trace by f, the frequency component of the signal by tanδ, and the dissipation factor of the dielectric material by ε. r This represents the real part of the dielectric constant of the dielectric material. As can be seen from the above formula, the wider the trace width of a high-speed signal transmission line, the smaller the attenuation it causes to the high-speed signal. Similarly, the lower the dissipation factor and dielectric constant of the transmission medium in a high-speed signal transmission line, the smaller the attenuation it causes to the high-speed signal.

[0052] In this embodiment of the invention, the first connector 310 can be a flexible flat cable (FFC), and the driving circuit board 200 can be a printed circuit board (PCB). Due to factors such as process and materials, the trace width in FFC is usually greater than that in PCB and FPC. The dissipation factor and dielectric constant of FFC are lower than those of PCB and FPC. Based on the above formula, it can be seen that, for the same transmission length, the attenuation of high-speed signals in FFC is less than that in PCB and FPC. The transmission quality of high-speed signals among the three, from best to worst, is: FFC, PCB, FPC. In the driving device provided by this embodiment of the invention, the length ratio of FFC in the high-speed signal transmission line is increased, and the high-speed signal is transmitted only through traces in FFC and PCB without setting up transmission lines in FPC, which can effectively reduce the attenuation of high-speed signals in the transmission line.

[0053] This invention will still use a 110-inch, 16K resolution, 60Hz refresh rate display panel as an example to illustrate the structure of the driving device in the display device, referring to... Figure 3 A driving unit Q can be formed by a control element 110, two driving circuit boards 200, and two first connectors 310. The driving device 10 may include two symmetrical driving units Q, that is, the driving device 10 includes two control elements 110, four driving circuit boards 200, and four first connectors 310 for transmitting high-speed signals, and the four driving circuit boards 200 are arranged along the first direction X. In specific implementations, for larger display panels, more driving circuit boards can be provided in the driving device to meet the arrangement requirements of signal transmission lines, and the driving device 10 can also be designed as an asymmetrical structure. This embodiment of the invention does not limit the specific design.

[0054] In the drive unit Q, the control element 110 is connected to each of the first connectors 310 in the drive unit Q via traces on the control board 100. Each first connector 310 is connected to one drive circuit board 200 in the drive unit Q. In specific implementations, the number of control elements 110 can be determined according to the number of interfaces on the edge of the control board 100. The number of drive circuit boards 200 controlled by each control element 110 can also be the same or different, and can be changed according to specific design requirements. This embodiment of the invention does not limit this.

[0055] Figure 4 This is a partial structural schematic diagram of the driving device provided in an embodiment of the present invention.

[0056] Figure 4 The connection structure between the remote drive circuit board 200 and the control element 110 in the drive device 10 is shown, such as... Figure 4As shown, the first connector 310 includes a first connecting line 311 and two first connectors 312. The two first connectors 312 are located at both ends of the first connecting line 311, and the first connecting line 311 is connected to the drive circuit board 200 and the control element 110 through the two first connectors 312.

[0057] Since connectors are typically used for bridging between PCB and FFC, and between PCB and FPC, and gold finger crimping is used for fixation, impedance abrupt changes can occur at the crimping points. These impedance abrupt changes can lead to significant signal reflection, severely impacting the transmission quality of high-speed signals. Therefore, the number of connectors used in high-speed signal transmission lines should be minimized. This embodiment of the invention uses only two first connectors 312 in the high-speed signal transmission line of the remote driver circuit board 200, reducing the number of connectors. This reduces the number of impedance abrupt changes in the line, thus reducing high-speed signal reflection and improving the transmission quality of high-speed signals.

[0058] like Figure 3 and Figure 4 As shown, the first connecting line 311 on the side of the drive unit Q near the control element 110 extends along the second direction Y. The first connecting line 311 on the side away from the control element 110 may include a first sub-segment 3111 and two second sub-segments 3112. The first sub-segment 3111 extends along the first direction X, and the second sub-segment 3112 extends along the second direction Y. The second direction Y and the first direction X are orthogonal. The two second sub-segments 3112 are located at both ends of the first sub-segment 3111, and the two second sub-segments 3112 are respectively connected to a first connector 312.

[0059] In this embodiment of the invention, the first connecting line 311 is directly connected to the near-end driving circuit board 200 along the second direction Y. The first segment 3111 of the first connecting line 311 connected to the far-end is aligned with the arrangement direction of each driving circuit board 200. The length of each first connecting line 311 in the driving device can be kept short, which can reduce signal attenuation. Furthermore, high-speed signals have a longer transmission distance in FFC but a shorter transmission distance in PCB. There are no traces for transmitting high-speed signals in FPC. Since the transmission quality of high-speed signals in FFC is better than that in PCB and FPC, the connection method of this embodiment of the invention can help improve the transmission quality of high-speed signals.

[0060] In this embodiment of the invention, Figure 4 In the high-speed signal transmission line connecting the driver chip furthest from the control element 110, the length of the trace in the first connecting line 311 can be set to 700mm, and the length of the trace in the far-end driver circuit board 200 can be set to 448mm. The total length of the high-speed signal transmission line is 1148mm. However, in Figure 1 In the high-speed signal line connecting the driver chip furthest from the control element, the trace length in the FFC is set to 180mm, the trace length in the near-end driver circuit board 200 is set to 390mm, the trace length in the FPC is set to 140mm, and the trace length in the far-end driver circuit board 200 is set to 540mm. The total trace length of the high-speed signal transmission line is 1250mm. The high-speed signal transmission line in this embodiment of the invention has a shorter total length and fewer components and types along its path, which helps to reduce the attenuation of the high-speed signal in the transmission path and improve the transmission quality of the high-speed signal.

[0061] Reference Figure 3 In this embodiment of the invention, the driving unit Q further includes a second connector 320 and a third connector 330. The second connector 320 is located on the side of the driving circuit board 200 away from the driving chip. The second connector 320 has a trace that can be used to connect two adjacent driving circuit boards 200. The third connector 330 can be used to connect the driving circuit board 200 near the control element 110 to the control element 110. Thus, a connection line can be formed between the control element, the third connector, the near-end driving circuit board, the second connector, and the far-end driving circuit board. This connection line can be used to transmit non-high-speed signals sent by the control element.

[0062] Specifically, the second connector 320 may include a second connecting line 321 and two second connectors 322. The second connecting line 321 is connected to the drive circuit boards 200 on both sides through the two second connectors 322 respectively. The second connecting line 321 may be a flexible flat cable or a flexible circuit board.

[0063] The third connector 330 may include a third connecting line 331 and two third connectors 332. The two third connectors 332 are located at both ends of the third connecting line 331. The third connecting line 331 extends along the second direction Y. The third connecting line 331 is connected to the drive circuit board 200 and the control board 100 respectively through the two third connectors 332. The third connecting line 331 may specifically be a flexible flat cable.

[0064] The third connector 332 connects to the interface on the control board 100 and forms a connection with the control element 110 in the corresponding drive unit Q through the wiring on the control board 100. Non-high-speed signals such as power signals and timing drive signals sent by the control element 110 can be transmitted to the near-end drive circuit board 200 through the third connector 330, and to the far-end drive circuit board 200 through the wiring in the near-end and far-end drive circuit boards 200 and the second connector 320, and then transmitted to the corresponding drive chip 210 through the wiring in each drive circuit board 200. Since the loss of non-high-speed signals at the connector is not significant, connecting adjacent drive circuit boards 200 to each other and then connecting the interconnected drive circuit boards to the control element 110 through the third connector 330 to form a non-high-speed signal transmission line can reduce the number of connecting parts in the drive device, save the amount of FFC, and help reduce the cost of the drive device.

[0065] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0066] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A driving device for a display panel, characterized in that, include: A control board, wherein at least one control element is provided on the control board; At least two driving circuit boards, wherein multiple driving chips are disposed on the driving circuit boards; At least two first connectors, one end of each first connector is connected to each of the drive circuit boards, and the other end of each first connector is connected to the control board. The first connector includes a first connecting line and two first connectors, the two first connectors being located at both ends of the first connecting line; the first connecting line is connected to the drive circuit board and the control element through the two first connectors respectively; One of the control elements, two of the drive circuit boards, and two of the first connectors constitute a drive unit; the drive device for the display panel includes two drive units that are symmetrical to each other. The control element in the drive unit is connected to each of the first connectors in the drive unit through the wiring on the control board, and each first connector is connected to one of the drive circuit boards in the drive unit. The aforementioned drive circuit boards are arranged along a first direction; The first connecting line in the drive unit, near the control element, extends along a second direction, and the first direction and the second direction are orthogonal. The first connecting line in the drive unit on the side away from the control element includes a first sub-segment and two second sub-segments. The first sub-segment extends along the first direction, and the second sub-segments extend along the second direction. The two second sub-segments are located at the two ends of the first sub-segment, and the second sub-segments are connected to the first connector.

2. The driving device for the display panel as described in claim 1, characterized in that, The first connecting line is a flexible flat cable.

3. The driving device for the display panel as described in claim 1, characterized in that, The control element is a timing controller, a system-on-a-chip, or a field-programmable gate array; The signals transmitted by the first connector include clock-embedded differential signals, TV unified standard interface signals, integrated data stream protocol signals, or China High Speed ​​Protocol interface signals.

4. The driving device for the display panel as described in any one of claims 1 to 3, characterized in that, The drive unit also includes: The second connector is located on the side of the drive circuit board away from the drive chip, and the second connector is used to connect two adjacent drive circuit boards. A third connector is used to connect the drive circuit board near the control element to the control element.

5. The driving device for the display panel as described in claim 4, characterized in that, The second connector includes a second connecting line and two second connectors, wherein the second connecting line is connected to the drive circuit boards on both sides respectively through the two second connectors; The third connector includes a third connecting line and two third connectors, the two third connectors being located at both ends of the third connecting line; the third connecting line extends along the second direction, and the third connecting line is connected to the drive circuit board and the control board respectively through the two third connectors.

6. The driving device for the display panel as described in claim 5, characterized in that, The second connecting line is a flexible flat cable or a flexible circuit board; the third connecting line is a flexible flat cable.

7. The driving device for the display panel as described in claim 4, characterized in that, The signals transmitted by the third connector include power signals and timing drive signals.

8. A display device, characterized in that, It includes a display panel and a driving device for the display panel as described in any one of claims 1 to 7, wherein the display panel is electrically connected to the driving device for the display panel.

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