Display device

Abstract

A display device. The display device includes a display panel and a plurality of flexible printed circuit boards. The display panel has a fan-out region and a display region. These flexible printed circuit boards are coupled to the display panel, wherein a first side of each flexible printed circuit board is configured with a plurality of first traces for transmitting a first set of clock signals among a plurality of clock signals, and a second side of each flexible printed circuit board opposite to the first side is configured with a plurality of second traces for transmitting a second set of clock signals among these clock signals. The first set of clock signals of one of these flexible printed circuit boards and the second set of clock signals of an adjacent flexible printed circuit board are transmitted to the display region via the fan-out region together.

Description

Technical Field

[0001] The present invention relates to a display device, and particularly to a display device having a plurality of display regions. Background Art

[0002] In a display device, in addition to a display panel configured with pixels, there is also a timing controller configured on a rigid printed circuit board. The display panel and the rigid printed circuit board are electrically connected to each other through a plurality of flexible printed circuit boards, and drive circuits can be configured on the flexible printed circuit boards to improve the overall utilization rate. Further, control signals (such as clock signals) provided by circuits on the rigid printed circuit board are not only supplied to circuits on the flexible printed circuit boards for use, but also transmitted to the display panel via the flexible printed circuit boards. However, due to the presence of circuits on the flexible printed circuit boards, the flexible printed circuit boards transmit control signals from the rigid printed circuit board through both of its sides, affecting the line impedance of the control signals and consequently affecting the display effect of the display panel. Summary of the Invention

[0003] The present invention provides a display device that can match the line impedance between clock signals to suppress color differences formed on the display panel due to unmatched line impedance of clock signals.

[0004] The display device of the present invention includes a display panel and a plurality of flexible printed circuit boards. The display panel has a fan-out region and a display region. These flexible printed circuit boards are coupled to the display panel, wherein a first side of each flexible printed circuit board is configured with a plurality of first traces for transmitting a first group of clock signals among a plurality of clock signals, and a second side of each flexible printed circuit board opposite to the first side is configured with a plurality of second traces for transmitting a second group of clock signals among these clock signals. The first group of clock signals of one of these flexible printed circuit boards and the second group of clock signals of an adjacent flexible printed circuit board are transmitted to the display region via the fan-out region together.

[0005] Based on the above, in the display device according to an embodiment of the present invention, the first group of clock signals of one of these flexible printed circuit boards and the second group of clock signals of an adjacent flexible printed circuit board are transmitted to the display region via the fan-out region together, which can match the line impedance between clock signals to suppress color differences formed on the display panel due to unmatched line impedance of clock signals.

[0006] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings of the specification as follows. Brief Description of the Drawings

[0007] Figure 1 It is a system schematic diagram of a display device according to a first embodiment of the present invention.

[0008] Description of reference numerals:

[0009] 100: Display device

[0010] 110: Rigid printed circuit board

[0011] 111: Timing controller

[0012] 112: Clock generation circuit

[0013] 120_1~120_9: Flexible printed circuit board

[0014] 120_1a: First side

[0015] 120_1b: Second side

[0016] 130: Display panel

[0017] 131: Fan-out area

[0018] 132: Display area

[0019] 132_1~132_3: Sub-display area

[0020] 132_1a: Left side

[0021] 132_1b: Right side

[0022] CK1~CK16: Clock signal

[0023] GDR: Scan Driver

[0024] SiC: The data driver

[0025] TC1: First trace

[0026] TC2: Second trace

[0027] Vdt: Display voltage DETAILED DESCRIPTION

[0028] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0029] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Thus, the "first element", "component", "region", "layer", or "part" discussed below may be referred to as a second element, component, region, layer, or part without departing from the teachings herein.

[0030] The terms used herein are for the purpose of describing particular embodiments only and are not limiting. As used herein, unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It should also be understood that when used in this specification, the terms "comprises" and / or "comprising" specify the presence of the stated features, regions, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components, and / or combinations thereof.

[0031] Figure 1 A system schematic diagram of a display device according to a first embodiment of the present invention. Please refer to Figure 1 , in this embodiment, the display device 100 includes a rigid printed circuit board 110, a plurality of flexible printed circuit boards 120_1 to 120_9, and a display panel 130, wherein the rigid printed circuit board 110 is coupled (or electrically connected) to the display panel 130 via these flexible printed circuit boards 120_1 to 120_9, and the numbers of the reference numerals are used to distinguish different elements, rather than to limit the number of elements.

[0032] The display panel 130 has a fan-out region 131 and a display region 132. On the first side 120_1a (such as the left side shown in the attached drawings) of each flexible printed circuit board (taking the flexible printed circuit board 120_1 as an example), a plurality of first traces TC1 for transmitting the first group of clock signals CK1 to CK8 among the plurality of clock signals CK1 to CK16 are arranged (shown as a single line here, but in fact, each of the clock signals CK1 to CK8 is transmitted through a different first trace TC1). On the second side 120_1b (such as the right side shown in the attached drawings) of each flexible printed circuit board (also taking the flexible printed circuit board 120_1 as an example) relative to the first side 120_1a, a plurality of second traces TC2 for transmitting the second group of clock signals CK9 to CK16 among these clock signals CK1 to CK16 are arranged (shown as a single line here, but in fact, each of the clock signals (shown as a single line here, but in fact, each of the clock signals CK9 to CK16 is transmitted through a different second trace TC2). Herein, the number of clock signals is for illustration by way of example, but the embodiments of the present invention are not limited thereto.

[0033] The first group of clock signals CK1 to CK8 of one of these flexible printed circuit boards (such as 120_1 to 120_9) are transmitted to the display region 132 via the fan-out region 131 together with the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board (such as 120_1 to 120_9). For example, the first group of clock signals CK1 to CK8 of the flexible printed circuit board 120_2 are transmitted to the display region 132 via the fan-out region 131 together with the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board 120_1; the first group of clock signals CK1 to CK8 of the flexible printed circuit board 120_3 are transmitted to the display region 132 via the fan-out region 131 together with the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board (not shown). The rest can be referred to the attached drawings and will not be elaborated here.

[0034] According to the above, since there is a long interval between the first group of clock signals CK1 to CK8 and the second group of clock signals CK9 to CK16 on the same flexible printed circuit board (such as 120_1 to 120_9), but there is a short interval between the first group of clock signals CK1 to CK8 of each flexible printed circuit board (such as 120_1 to 120_9) and the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board (such as 120_1 to 120_9). Therefore, by transmitting the first group of clock signals CK1 to CK8 of one of these flexible printed circuit boards (such as 120_1 to 120_9) together with the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board (such as 120_1 to 120_9) to the display area 132 via the fan-out area 131, the line impedance between the clock signals CK1 to CK16 can be matched to suppress the color difference formed on the display panel 130 due to the mismatch of the line impedance of the clock signals CK1 to CK16.

[0035] In this embodiment, the display area 132 is divided into a plurality of sub-display areas 132_1 to 132_3, and each display area 132 receives at least the first group of clock signals CK1 to CK8 of one of these flexible printed circuit boards 120_1 to 120_9 and the second group of clock signals CK9 to CK16 of the adjacent flexible printed circuit board 120_1 to 120_9. For example, the sub-display area 132_1 can receive the first group of clock signals CK1 to CK8 from the flexible printed circuit board 120_2 and the second group of clock signals CK9 to CK16 from the flexible printed circuit board 120_1 and / or the first group of clock signals CK1 to CK8 from the flexible printed circuit board 120_3 and the second group of clock signals CK9 to CK16 from the flexible printed circuit board (not shown). The rest can be referred to as shown in the drawings and will not be elaborated here.

[0036] In this embodiment, at least one scan driver GDR (taking two scan drivers GDR as an example here) is disposed in each sub-display area 132_1 to 132_3. Each scan driver GDR is configured to receive a first set of clock signals CK1 to CK8 from one of the flexible printed circuit boards 120_1 to 120_9 and a second set of clock signals CK9 to CK16 from its adjacent flexible printed circuit boards 120_1 to 120_9. For example, the scan driver GDR on the left side 132_1a of the sub-display area 132_1 in the drawing can receive the first set of clock signals CK1 to CK8 from the flexible printed circuit board 120_2 and the second set of clock signals CK9 to CK16 from the flexible printed circuit board 120_1. The scan driver GDR on the right side 132_1b of the sub-display area 132_1 in the drawing can receive the first set of clock signals CK1 to CK8 from the flexible printed circuit board 120_3 and the second set of clock signals CK9 to CK16 from a flexible printed circuit board (not shown). The rest can be referred to as shown in the drawing and will not be elaborated here.

[0037] In this embodiment, each of the flexible printed circuit boards 120_1 to 120_9 is further configured with a data driver SiC, which provides a plurality of display voltages Vdt to corresponding sub-display areas (such as 132_1 to 132_3) in the display area 132 based on these clock signals CK1 to CK16.

[0038] In this embodiment, the rigid printed circuit board 110 is configured with a timing controller 111 and a clock generation circuit 112. The clock generation circuit 112 is used to generate these clock signals CK1 to CK16, and the timing controller 111 is used to generate control signals (not shown) required for the operation of the scan driver GDR, control signals (not shown) required for the operation of the data driver SiC, and display data (not shown). The control signals (not shown) required for the operation of the scan driver GDR can be transmitted from the rigid printed circuit board 110 to each sub-display area 132_1 to 132_3 via the flexible printed circuit boards 120_1 to 120_9.

[0039] In this embodiment, since the scan driver GDR is disposed close to the side of the sub-display area (such as 132_1 to 132_3), considering the minimum line impedance, one of the flexible printed circuit boards (such as 120_1 to 120_9) that provides the first set of clock signals CK1 to CK8 and the adjacent flexible printed circuit board (such as 120_1 to 120_9) that provides the second set of clock signals CK9 to CK16 is adjacent to the side of the corresponding sub-display area (such as 132_1 to 132_3). For example, the flexible printed circuit board 120_1 that provides the second set of clock signals CK9 to CK16 to the scan driver GDR on the left side 132_1a of the sub-display area 132_1 in the drawing can be adjacent to the left side 132_1a of the sub-display area 132_1, and the flexible printed circuit board 120_3 that provides the first set of clock signals CK1 to CK8 to the scan driver GDR on the right side 132_1b of the sub-display area 132_1 in the drawing can be adjacent to the right side 132_1b of the sub-display area 132_1. The rest can be referred to the drawing and will not be elaborated here.

[0040] Relatively speaking, considering the overall line impedance, one of the flexible printed circuit boards (such as 120_1 to 120_9) that transmits the first set of clock signals CK1 to CK8 and the second set of clock signals CK9 to CK16 transmitted by the adjacent flexible printed circuit board (such as 120_1 to 120_9) can be adopted. The embodiments of the present invention are not limited thereto.

[0041] In this embodiment, for the flexible printed circuit board (such as 120_1 to 120_9) that provides the second set of clock signals CK9 to CK16 to the sub-display area (such as 132_1 to 132_3), the first set of clock signals CK1 to CK8 on its first side will not be transmitted to the display panel 130. And, for the flexible printed circuit board (such as 120_1 to 120_9) that provides the first set of clock signals CK1 to CK8 to the sub-display area (such as 132_1 to 132_3), the second set of clock signals CK9 to CK16 on its second side will not be transmitted to the display panel 130. For example, the first set of clock signals CK1 to CK8 on the first side 120_1a (i.e., the left side in the drawing) of the flexible printed circuit board 120_1 will not be transmitted to the display panel 130, and the second set of clock signals CK9 to CK16 on the second side 120_1b (i.e., the right side in the drawing) of the flexible printed circuit board 120_2 will not be transmitted to the display panel 130. The rest can be referred to the drawing and will not be elaborated here.

[0042] In this embodiment, each sub-display area (such as 132_1 to 132_3) may correspond to multiple flexible printed circuit boards (such as 120_1 to 120_9), and each sub-display area (such as 132_1 to 132_3) may only require a limited number of groups (for example, 2 groups) of CK1 to CK16. Therefore, the first group of clock signals CK1 to CK8 and the second group of clock signals CK9 to CK16 transmitted by some of the flexible printed circuit boards (such as 120_1 to 120_9) will not be transmitted to the display panel 130.

[0043] In summary, in the display device according to the embodiment of the present invention, since there is a long interval between the first group of clock signals and the second group of clock signals on the same flexible printed circuit board, but there is a short interval between the first group of clock signals of each flexible printed circuit board and the second group of clock signals of the adjacent flexible printed circuit board. Therefore, by transmitting the first group of clock signals of one of these flexible printed circuit boards together with the second group of clock signals of the adjacent flexible printed circuit board to the display area via the fan-out area, the line impedance between the clock signals can be matched to suppress the color difference formed on the display panel due to the mismatch of the line impedance of the clock signals.

[0044] Although the present invention has been disclosed above with embodiments, it is not intended to limit the present invention. Any person skilled in the art within the technical field, without departing from the concept and scope of the present invention, may make some changes and modifications. Therefore, the protection scope of the present invention shall be subject to what is defined by the claims.

Claims

1. A display device, comprising: A display panel having an output region and a display area; A plurality of flexible printed circuit boards coupled to the display panel, wherein a first side of each of the flexible printed circuit boards is configured with a plurality of first traces for transmitting a first set of clock signals among a plurality of clock signals, and a second side of each of the flexible printed circuit boards opposite to the first side is configured with a plurality of second traces for transmitting a second set of clock signals among the clock signals, wherein the first set of clock signals of one of the flexible printed circuit boards is transmitted to the display area via the output region together with the second set of clock signals of an adjacent flexible printed circuit board.

2. The display device according to claim 1, wherein each of the flexible printed circuit boards is further configured with a data driver for providing a plurality of display voltages to the display area based on the clock signals.

3. The display device according to claim 1, further comprising a rigid printed circuit board coupled to the flexible printed circuit boards and configured with a timing controller and a clock generation circuit, wherein the clock generation circuit is used to generate the clock signals.

4. The display device according to claim 1, wherein the display area is divided into a plurality of sub-display areas, and each of the display areas receives at least the first set of clock signals of one of the flexible printed circuit boards and the second set of clock signals of an adjacent flexible printed circuit board.

5. The display device according to claim 4, wherein each of the sub-display areas is configured with at least one scan driver, and each scan driver is used to receive the first set of clock signals of one of the flexible printed circuit boards and the second set of clock signals of an adjacent flexible printed circuit board.

6. The display device according to claim 4, wherein one of the flexible printed circuit boards or an adjacent flexible printed circuit board is adjacent to a side of a corresponding sub-display area.

7. The display device according to claim 1, wherein the second set of clock signals on the second side of one of the flexible printed circuit boards is not transmitted to the display panel.

8. The display device according to claim 1, wherein the first set of clock signals on the first side of adjacent flexible printed circuit boards is not transmitted to the display panel.

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