Liquid crystal display device

Abstract

The utility model discloses a liquid crystal display device, which belongs to the field of display devices and comprises a display panel, a COF (chip on film) type source driver and a horizontal circuit board, and the display panel is electrically connected with the horizontal circuit board through the COF type source driver. The horizontal circuit board comprises a first circuit board, a second circuit board and a third circuit board which are sequentially connected in the length direction of the display panel; the first circuit board is connected with three COF type source drivers, the second circuit board is connected with five COF type source drivers, and the third circuit board is connected with four COF type source drivers, so that the liquid crystal display device is more convenient to produce and process.

Description

Technical Field

[0001] This utility model belongs to the field of display device technology, and specifically relates to a liquid crystal display device. Background Technology

[0002] Typically, a liquid crystal display device includes a liquid crystal panel, a horizontal circuit board (X-board, XB), a main board (MB), and a control board (CB). The main board and the control board are electrically connected, and the control board is electrically connected to the liquid crystal panel via the horizontal circuit board. The horizontal circuit board and the liquid crystal panel are electrically connected via a COF (Chip-On-Flex) type source driver. Thus, after the main board receives the image data signal to be transmitted, it processes the signal through the row expansion module and column expansion module, and transmits the processed data to the control board. Upon receiving the data signal, the control board transmits it through the horizontal circuit board to the source driver circuit and gate driver circuit in the liquid crystal panel, thereby driving the liquid crystal panel to display the image.

[0003] With the trend towards larger screen sizes and higher PPI in TV products, LCD panel sizes are also trending towards larger sizes, such as 70 inches, 75 inches, and 100 inches. Because excessively long horizontal circuit boards increase the manufacturing difficulty of COF-type source drivers, it hinders the production and processing of LCD devices. Therefore, commonly used LCD devices currently employ four horizontal circuit boards, each connected to three COF-type source drivers. This structure, using multiple horizontal circuit boards for signal transmission, reduces the size of a single horizontal circuit board, thereby lowering the manufacturing difficulty of the COF-type source drivers. However, the large number of horizontal circuit boards further complicates the production and processing of LCD devices. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a liquid crystal display device. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a liquid crystal display device, including a display panel, a COF type source driver, and a horizontal circuit board. The display panel and the horizontal circuit board are electrically connected by the COF type source driver. The horizontal circuit board includes a first circuit board, a second circuit board, and a third circuit board connected sequentially along the length of the display panel. Three COF type source drivers are connected to the first circuit board, five COF type source drivers are connected to the second circuit board, and four COF type source drivers are connected to the third circuit board.

[0006] In one embodiment of this utility model, the length of the second circuit board is greater than the length of the third circuit board, and the length of the third circuit board is greater than the length of the first circuit board.

[0007] In an embodiment of the utility model, COF type source driver and horizontal direction circuit board are connected through mini-LVDS interface, and the mini-LVDS interface has 4 groups of data lines;

[0008] Three COF type source drivers of first circuit board share a group of data lines, three COF type source drivers close to first circuit board in second circuit board share a group of data lines, two COF type source drivers close to third circuit board in second circuit board and one COF type source driver close to second circuit board in third circuit board share a group of data lines, and three COF type source drivers away from second circuit board in third circuit board share a group of data lines.

[0009] In an embodiment of the utility model, each group of data lines has 6 branches.

[0010] In an embodiment of the utility model, the interval between any two adjacent COF type source drivers along the length direction of display panel is equal.

[0011] In an embodiment of the utility model, first circuit board and second circuit board are connected through flexible flat cable, and second circuit board and third circuit board are connected through flexible flat cable.

[0012] In an embodiment of the utility model, the liquid crystal display device further comprises a mainboard, and the mainboard and the second circuit board are electrically connected.

[0013] In an embodiment of the utility model, the liquid crystal display device is of TCONLESS structure, and the mainboard is provided with an SOC chip.

[0014] In an embodiment of the utility model, the second circuit board is provided with a signal converter, the SOC chip is electrically connected with the signal converter through a P2P interface, and the signal converter is used for converting the signal of the P2P interface into a mini-LVDS signal.

[0015] In an embodiment of the utility model, the display panel comprises a pixel matrix, a source driving circuit and a gate driving circuit, the COF type source driver is electrically connected with the source driving circuit.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] In the above scheme, first, the liquid crystal display device includes a display panel, COF type source drivers, and a horizontal direction circuit board, the display panel and the horizontal direction circuit board are electrically connected through the COF type source drivers, and the horizontal direction circuit board includes a first circuit board, a second circuit board, and a third circuit board connected in sequence along the length direction of the display panel. With this structure, signal transmission is performed through three circuit boards, which can reduce the size of a single circuit board, thereby reducing the manufacturing process difficulty of the COF type source drivers, and the horizontal direction circuit board is composed of three circuit boards, which can reduce the number of circuit boards, making the production and processing of the liquid crystal display device more convenient. At the same time, the above structure can reduce the connection structure between two circuit boards, thereby reducing signal transmission loss and the risk of signal mutation, improving the consistency of signal transmission, and reducing the cost. Secondly, the first circuit board is connected with three COF type source drivers, the second circuit board is connected with five COF type source drivers, and the third circuit board is connected with four COF type source drivers, the lengths of the first circuit board, the second circuit board, and the third circuit board are different, which can optimize the layout mode of the COF type source drivers on each circuit board, so that the horizontal direction circuit board can be applied to display panels of different sizes and different installation positions, making the wiring and layout of components of the liquid crystal display device more convenient and flexible, and improving the application range of the liquid crystal display device.

[0018] The utility model will be described in further detail below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the schematic diagram of the liquid crystal display device provided by the utility model embodiment Figure One ;

[0020] Figure 2 is the schematic diagram of the liquid crystal display device provided by the utility model embodiment Figure Two .

[0021] Fig. 1-Display panel, 2-COF type source driver, 3-Horizontal direction circuit board, 31-First circuit board, 32-Second circuit board, 321-Signal converter, 33-Third circuit board, 4-Flexible flat cable, 5-Mainboard, 51-SOC chip DETAILED DESCRIPTION

[0022] The utility model will be described in further detail below in combination with the drawings and embodiments.

[0023] Please refer to Figure 1 and Figure 2The utility model embodiment provides a kind of liquid crystal display device, including display panel 1, COF type source driver 2 and horizontal direction circuit board 3, display panel 1 and horizontal direction circuit board 3 are electrically connected by COF type source driver 2, horizontal direction circuit board 3 includes the first circuit board 31, second circuit board 32 and third circuit board 33 sequentially connected along the length direction of display panel 1;Three COF type source drivers 2 are connected on the first circuit board 31, five COF type source drivers 2 are connected on the second circuit board 32, four COF type source drivers 2 are connected on the third circuit board 33, and the length of the first circuit board 31, the second circuit board 32 and the third circuit board 33 are all different.

[0024] In some embodiments of the present application, the display panel 1 (Panel) is provided with a source drive circuit and a gate drive circuit. The source drive circuit is used to generate analog pixel signals, which are output in parallel row by row after gamma correction to meet the light transmission characteristics of liquid crystal molecules, thereby ensuring accurate display of images. The gate drive circuit is responsible for controlling the switching of TFT (Thin Film Transistor) row by row, ensuring accurate switching control through positive pulses and negative voltages, thereby ensuring accurate presentation of liquid crystal pixels.

[0025] In some embodiments of the present application, COF type source driver 2 (Chip On Film Source Driver IC) is a kind of existing driver based on packaging technology of fixing integrated circuit on flexible circuit board, commonly used in liquid crystal display and other electronic devices. COF type source driver has the advantages of small size, light weight and good heat dissipation effect, and can provide efficient and reliable driving function. The main function of COF type source driver 2 is to convert the RGB signal sent by the signal control circuit into an analog signal suitable for driving liquid crystal screen.

[0026] In some embodiments of the present application, horizontal direction circuit board 3 (X-board, XB) is a kind of PCB board arranged along horizontal direction. The horizontal direction circuit board is mainly used to provide electrical connection between source drive circuit and gate drive circuit to ensure that driving signal can be accurately transmitted from drive circuit to display panel 1, thereby controlling the arrangement and display of liquid crystal molecules. The horizontal direction circuit board is also responsible for transmitting the signals output by System On Chip (SOC). After processing, these signals are transmitted to the source drive circuit and the gate drive circuit through the horizontal direction circuit board 3, and finally control the display of liquid crystal molecules.

[0027] In some embodiments of the present application, the second circuit board 32 is located between the first circuit board 31 and the third circuit board 33, one end of the second circuit board 32 is electrically connected with the first circuit board 31, and the other end is electrically connected with the third circuit board 33.

[0028] In some embodiments of the present application, the display panel 1 of the liquid crystal display device can be a 70-inch 4K panel. Generally, a 70-inch 4K panel needs to be configured with 12 COF type source drivers. The first circuit board 31, the second circuit board 32 and the third circuit board 33 described above can distribute the 12 COF type source drivers, so that the liquid crystal display device can work normally. Of course, the display panel 1 of the liquid crystal display device described above can also be of other sizes such as 75 inches or 100 inches.

[0029] In some embodiments of the present application, as shown in Figure 2 The first circuit board 31 is an XR circuit board, the second circuit board 32 is an XM circuit board, and the third circuit board 33 is an XL circuit board.

[0030] In the above scheme, first, the liquid crystal display device includes a display panel 1, a COF type source driver 2 and a horizontal direction circuit board 3. The display panel 1 and the horizontal direction circuit board 3 are electrically connected through the COF type source driver 2. The horizontal direction circuit board 3 includes a first circuit board 31, a second circuit board 32 and a third circuit board 33 connected in sequence along the length direction of the display panel 1. With this structure, signal transmission is performed through three circuit boards, which can reduce the size of a single circuit board, thereby reducing the manufacturing process difficulty of the COF type source driver 2. Moreover, the horizontal direction circuit board 3 is composed of three circuit boards, which can reduce the number of circuit boards, thereby reducing the number of circuit boards that need to be plugged in during installation and the number of connection structures between circuit boards, so that the production and processing of the liquid crystal display device are more convenient. At the same time, the above structure can reduce the connection structure between two circuit boards, thereby reducing the signal transmission loss and the risk of signal mutation, improving the consistency of signal transmission, and reducing the cost. Secondly, the first circuit board 31 is connected with 3 COF type source drivers 2, the second circuit board 32 is connected with 5 COF type source drivers 2, and the third circuit board 33 is connected with 4 COF type source drivers 2. The lengths of the first circuit board 31, the second circuit board 32 and the third circuit board 33 are different, which can optimize the layout mode of the COF type source drivers 2 on each circuit board, so that the horizontal direction circuit board 3 can be applied to display panels 1 of different sizes and different installation positions, making the wiring and layout of components of the liquid crystal display device more convenient and flexible, and improving the application range of the liquid crystal display device.

[0031] In some embodiments of the present application, the length of the second circuit board 32 is greater than the length of the third circuit board 33, and the length of the third circuit board 33 is greater than the length of the first circuit board 31. With this structure, the length of the second circuit board 32 in the middle is the largest, so that more COF type source drivers 2 can be arranged on the second circuit board 32, while the stability of the overall connection of the horizontal direction circuit board 3 can be improved, and the lengths of the second circuit board 32, the third circuit board 33 and the first circuit board 31 gradually decrease, which facilitates the optimization of the layout of the COF type source drivers 2 on each circuit board, so that the horizontal direction circuit board 3 can be applied to display panels 1 of different sizes and different mounting positions, and the wiring and component layout of the liquid crystal display device are more convenient and flexible, and the application range of the liquid crystal display device is improved.

[0032] In some embodiments of the present application, the COF type source driver 2 and the horizontal direction circuit board 3 are connected through a mini-LVDS interface, the mini-LVDS interface has 4 groups of data lines, 3 COF type source drivers 2 of the first circuit board 31 share one group of data lines, 3 COF type source drivers 2 of the second circuit board 32 close to the first circuit board 31 share one group of data lines, 2 COF type source drivers 2 of the second circuit board 32 close to the third circuit board 33 and 1 COF type source driver 2 of the third circuit board 33 close to the second circuit board 32 share one group of data lines, and 3 COF type source drivers 2 of the third circuit board 33 away from the second circuit board 32 share one group of data lines. With this structure, the data of each circuit board on the COF type source driver 2 is allocated, so that the signals output by the main board 5 (MB) can be sequentially allocated to each circuit board, so that the horizontal direction circuit board 3 can realize the allocation and transmission of 4 groups (port) of data.

[0033] In some embodiments of the present application, the mini-LVDS interface is a high-speed, low-power and low-electromagnetic interference interface standard, mainly applied to the column driver of a thin film transistor liquid crystal display (TFT LCD) panel, for signal transmission from a TCON (timing controller) to a source driver.

[0034] In some embodiments of the present application, each group of data lines has 6 branches (pairs). With this structure, each group of data is transmitted through 6 branches, which can ensure that the liquid crystal display device can work normally, and can improve the efficiency of signal transmission.

[0035] In some embodiments of the present application, the horizontal direction circuit board 3 described above can realize 4 groups of 6 branch (4port6pair) signal transmission.

[0036] In some embodiments of the present application, the length direction of the display panel 1 is parallel to the length direction of the horizontal direction circuit board 3.

[0037] In some embodiments of the present application, the distance between any two adjacent COF type source drivers 2 along the length direction of the display panel 1 is equal. With this structure, it is convenient for the plurality of COF type source drivers 2 to connect the same group of data lines, and it is convenient for the plurality of COF type source drivers 2 to connect the display panel 1.

[0038] In some embodiments of the present application, the first circuit board 31 and the second circuit board 32 are connected through the flexible flat cable 4, and the second circuit board 32 and the third circuit board 33 are connected through the flexible flat cable 4. With this structure, compared with the prior display device, the number of circuit boards in the horizontal direction circuit board 3 in the above-mentioned liquid crystal display device of the present application is reduced, so that the number of flexible flat cables between adjacent two circuit boards can also be reduced, thereby reducing the signal transmission loss and the risk of signal mutation, improving the consistency of signal transmission, and reducing the cost.

[0039] In some embodiments of the present application, the flexible flat cable 4 can be a flexible circuit board (Flexible Printed Circuit, FPC), or a flexible flat cable (Flexible flat cable, FFC).

[0040] In some embodiments of the present application, the liquid crystal display device further comprises a main board 5, and the main board 5 and the second circuit board 32 are electrically connected. With this structure, the main board 5 can receive the image data signal to be transmitted, and when the main board 5 and the second circuit board 32 are electrically connected, the main board 5 can process the signal through the row expansion module and the column expansion module, and transmit the processed data to the second circuit board 32, and then the second circuit board 32 transmits the signal to the first circuit and the third circuit board 33, and then the first circuit board 31, the second circuit board 32 and the third circuit board 33 transmit the signal to the source drive circuit and the gate drive circuit in the display panel 1, thereby driving the display panel 1 to display.

[0041] In some embodiments of the present application, the liquid crystal display device is a TCONLESS structure, and the main board 5 is provided with a SOC chip 51. The TCONLESS structure is a kind of timing controller (Timing Control, TCON) in liquid crystal panel related technology, and the functions of all or part of the timing controller are realized by the system on chip (System On Chip, SOC) on the main board 5 (MB). After the SOC chip on the main board 5 increases the TCON function, the area of the main board 5 can remain unchanged. With this structure, the liquid crystal display device can not be provided with a control board (Control board, CB), and the composition module is MB→XB→panel, so that the structure and size of the liquid crystal display panel 1 can be simplified, and the cost of the liquid crystal display panel 1 can be reduced.

[0042] In some embodiments of the present application, a signal converter 321 (BTCON, BT) is arranged on the second circuit board 32, the SOC chip 51 is electrically connected with the signal converter 321 through the P2P interface, and the signal converter 321 is used for converting the signal of the P2P interface into a mini-LVDS signal. With this structure, the composition module of the liquid crystal display device can be SOC->BT->panel, wherein the SOC chip 51 is electrically connected with the signal converter 321 (BT) through the P2P interface, so that the SOC chip 51 can transmit control data and data data to the signal converter 321 (BT) through the P2P interface, and then transmit the control data and the data data to the display panel 1 through the signal converter 321 (BT). Wherein, the P2P signal output by the P2P interface is converted into a mini-LVDS signal through the BT IC on the XM, and is output as a 4port mini-LVDS, so that the source driver (Source Driver) can use the mini-LVDS interface instead of the image signal processor (isp), reducing the cost of the Source Driver, and the data of the 4port mini can be evenly distributed to the three XB.

[0043] In some embodiments of the present application, the display panel 1 includes a pixel matrix, a source driving circuit and a gate driving circuit, and the COF type source driver 2 is electrically connected with the source driving circuit. With this structure, after the horizontal direction circuit board 3 receives the signal, the signal can be transmitted to the source driving circuit and the gate driving circuit in the liquid crystal panel, so as to drive the pixel matrix to display.

[0044] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0046] In the utility model, unless another explicit provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication or the interaction relationship of two elements of two elements inside.For the ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0047] In addition, the liquid crystal display device in the embodiment of the utility model can be: LTPO liquid crystal display device, MicroLED liquid crystal display device, liquid crystal panel, electronic paper, OLED panel, AMOLED panel, mobile phone, tablet computer, television, display, notebook computer, digital photo frame and so on any product or component with display function.

[0048] The above content is further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions.For the ordinary skilled person in the art to which the utility model belongs, on the premise of not departing from the concept of the utility model, a number of simple deductions or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims

1. A liquid crystal display device, characterized in that, The device includes a display panel, a COF-type source driver, and a horizontal circuit board. The display panel and the horizontal circuit board are electrically connected through the COF-type source driver. The horizontal circuit board includes a first circuit board, a second circuit board, and a third circuit board that are sequentially connected along the length of the display panel. The first circuit board is connected to three COF-type source drivers, the second circuit board is connected to five COF-type source drivers, and the third circuit board is connected to four COF-type source drivers. The lengths of the first circuit board, the second circuit board, and the third circuit board are all different.

2. The liquid crystal display device according to claim 1, characterized in that, The length of the second circuit board is greater than the length of the third circuit board, and the length of the third circuit board is greater than the length of the first circuit board.

3. The liquid crystal display device according to claim 1, characterized in that, The COF-type source driver is connected to the horizontal circuit board via a mini-LVDS interface, which has four sets of data lines. The three COF source drivers on the first circuit board share a set of data lines. The three COF source drivers on the second circuit board that are close to the first circuit board share a set of data lines. The two COF source drivers on the second circuit board that are close to the third circuit board and the one COF source driver on the third circuit board that is close to the second circuit board share a set of data lines. The three COF source drivers on the third circuit board that are far from the second circuit board share a set of data lines.

4. The liquid crystal display device according to claim 3, characterized in that, Each set of data lines has 6 branches.

5. The liquid crystal display device according to claim 3, characterized in that, Along the length of the display panel, the spacing between any two adjacent COF source drivers is equal.

6. The liquid crystal display device according to claim 1, characterized in that, The first circuit board and the second circuit board are connected by a flexible flat cable, and the second circuit board and the third circuit board are connected by a flexible flat cable.

7. The liquid crystal display device according to claim 1, characterized in that, The liquid crystal display device also includes a motherboard, which is electrically connected to the second circuit board.

8. The liquid crystal display device according to claim 7, characterized in that, The liquid crystal display device has a TCONLESS structure, and the motherboard has a SOC chip.

9. The liquid crystal display device according to claim 8, characterized in that, The second circuit board is equipped with a signal converter. The SOC chip is electrically connected to the signal converter through a P2P interface. The signal converter is used to convert the signal of the P2P interface into a mini-LVDS signal.

10. The liquid crystal display device according to claim 1, characterized in that, The display panel includes a pixel matrix, a source driving circuit, and a gate driving circuit, and the COF-type source driver and the source driving circuit are electrically connected.

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