Display device

Abstract

The present invention addresses the problem of providing a display device having a free format that can cope with a user. A display device (100) according to the present invention is provided with a transparent film-like substrate (120), daisy chain wiring (130) formed on the substrate, and a plurality of LED devices (140-1, 140-2,..., 140-n) daisy chain-connected via the daisy chain wiring (130). One daisy chain wiring (130) includes a Vdd wiring, a GND wiring, and a DATA wiring formed in a linear shape, and the LED devices (140-1, 140-2,..., 140-n) are respectively connected in common with the Vdd wiring and the GND wiring, and are connected in series via the DATA wiring so as to be connected in a bead-like manner.

Description

Technical Field

[0001] The present invention relates to a display device having a plurality of light-emitting elements disposed on a substrate, and particularly to a display device having an LED device such as a micro LED (light-emitting diode) mounted on a substrate. Background Technology

[0002] In recent years, micro-LEDs capable of directly displaying images from light-emitting diodes have been developed. The micro-LEDs are arranged in a two-dimensional manner corresponding to each pixel. For example, the anodes of each light-emitting diode are connected to the data wiring in a common manner, and the cathodes are connected to the scan wiring to drive each light-emitting diode (e.g., Patent Document 1).

[0003] Existing technical documents:

[0004] Patent documents:

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-504752 Summary of the Invention

[0006] The problem that the invention aims to solve:

[0007] In LED displays that configure LEDs into a matrix, there is a market demand for transparent, flexible, and free-form LEDs. Although transparent film LED displays have been developed, they cannot handle free-form designs.

[0008] Figure 1 This is a diagram illustrating the free-form shape of a transparent film LED display. Users sometimes cut the LED display, or remove a portion of it, using scissors or a cutter, to change the shape and size of the display according to its intended use. As a result, no electrical signal is supplied to the area behind the cut point, causing the LED to become unlit and creating an undisplayed area.

[0009] Figure 2 (A) and (B) are schematic diagrams of the wiring of a passive-driven LED display. Data wiring 20 (e.g., column direction) and scan wiring 30 (e.g., row direction) are formed in a matrix on the surface of the substrate 10. LEDs 40 are mounted at the intersections of the data wiring 20 and scan wiring 30. When the current-carrying direction of the data wiring 20 is X and the current-carrying direction of the scan wiring 30 is Y, as shown... Figure 2 As shown in (A), the user cuts the substrate 10 along line L, or as... Figure 2 As shown in (B), if a portion of region K is cut off, no electrical signal is supplied thereafter, resulting in a non-displayed region Q, which degrades the visual quality of the display device.

[0010] The purpose of this invention is to solve these previous problems and provide a display device that can accommodate users' free format.

[0011] Methods used to solve problems:

[0012] The display device of the present invention includes: a substrate; daisy-chain wiring formed on the substrate; and a plurality of light-emitting devices daisy-chained together via the daisy-chain wiring.

[0013] Invention effects:

[0014] According to the present invention, since multiple light-emitting devices are daisy-chained together, an arbitrary display area based on the cutting of the substrate can be obtained, and the generation of non-display areas can be suppressed. Attached Figure Description

[0015] Figure 1 This is a free-format image representing an LED display with a transparent thin film.

[0016] Figure 2 This diagram illustrates both an example of a conventional LED display matrix wiring and a free-form example.

[0017] Figure 3 (A) is a diagram showing the overall structure of a display device according to an embodiment of the present invention. Figure 3 (B) is a diagram showing an LED device connected in a daisy chain. Figure 3 (C) is a diagram showing the structure of the terminal face of the LED device.

[0018] Figure 4 This is a diagram showing the internal structure of the LED device according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic perspective view showing the structure of the LED substrate according to the first embodiment of the present invention.

[0020] Figure 6 This is a schematic perspective view showing the structure of the LED substrate according to the second embodiment of the present invention.

[0021] Figure 7 This is a schematic perspective view showing the structure of the LED substrate according to the third embodiment of the present invention.

[0022] Figure 8 This is a plan view showing the LED substrate structure according to the fourth embodiment of the present invention.

[0023] Figure 9 This is a schematic perspective view showing the structure of the LED substrate according to the fifth embodiment of the present invention.

[0024] Figure 10This is a top view showing the structure of the LED substrate according to the fifth embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100: Display device; 110: Drive control unit

[0027] 120: LED substrate; 130: Wiring for daisy chain.

[0028] 140: LED device Detailed Implementation

[0029] This invention relates to a display device (display) with multiple light-emitting devices mounted on a substrate, and particularly to a display device capable of accommodating user-defined formats. The light-emitting devices are not particularly limited, and may include, for example, miniature LEDs within a package. In the case of the display device displaying a color image, the light-emitting devices include miniature LEDs of R, G, and B. Additionally, the light-emitting devices may include daisy-chained active elements for receiving control data from adjacent light-emitting devices and controlling the light emission of the LEDs based on that control data. It should be noted that the accompanying drawings referenced in the following description include exaggerated representations for ease of understanding of the invention and do not represent the shape or proportions of an actual product.

[0030]

Example

[0031] Figure 3 Figure (A) is a block diagram showing the overall structure of a display device according to an embodiment of the present invention. As shown in the figure, the display device 100 includes a drive control unit 110 and an LED substrate 120. A plurality of daisy-chain wirings 130 are formed on the LED substrate 120, and one end of each daisy-chain wiring 130 is electrically connected to the drive control unit 110. A plurality of LED devices 140 are mounted on the LED substrate 120 and daisy-chained together via the daisy-chain wirings 130.

[0032] The planar shape of the LED substrate 120 is not particularly limited; for example, it may have a rectangular shape as shown in the figure. The LED substrate 120 is made of a material that can be cut by a cutting device such as scissors or a cutter, or has a thickness such as being made of a light-transmitting substrate or film such as glass, plastic, or acrylic, or a semiconductor substrate such as silicon. Preferably, the LED substrate 120 is a transparent film-like polyimide substrate.

[0033] On the surface of the LED substrate 120, a linear daisy-chain wiring 130 is formed along its length. For example... Figure 3 As shown in (B), a daisy-chain wiring 130 is configured to include a Vdd wiring, a GND wiring, and a DATA wiring for power supply. Here, for convenience, the Vdd wiring, GND wiring, and DATA wiring are referred to as daisy-chain wiring.

[0034] Daisy-chain wiring 130 is formed by patterning a single layer or stack of a metal material, such as Au, Ag, Cu, AgMg, Al, or ITO, deposited on the LED substrate 120. Multiple such daisy-chain wirings 130 are formed along the short side of the LED substrate 120.

[0035] The drive control unit 110 is electrically connected to the LED device 140 via a daisy-chain wiring 130. Figure 3 (B) represents an example of a daisy-chain connection of LED device 140. Figure 3 (C) is a top view of the terminal face of an LED device. One LED device 140, for example, has a rectangular package, such as... Figure 3 As shown in (C), a Vdd terminal, a Din terminal, a Dout terminal, and a GND terminal are formed on the terminal side (e.g., the bottom side) of the package.

[0036] like Figure 3 As shown in (B), the Vdd and GND terminals of LED devices 140-1, 140-2, ..., 140-n (collectively referred to as LED devices 140) are connected to the Vdd and GND wiring in a common manner. The Din terminal of the first LED device 140-1 is electrically connected to the drive control unit 110 via DATA wiring, the Dout terminal is electrically connected to the Din terminal of the adjacent LED device 140-2 via DATA wiring, and the Dout terminal of LED device 140-2 is electrically connected to the Din terminal of the adjacent LED device 140-3 via DATA wiring. That is, LED devices 140-1, 140-2, ..., 140-n are connected in series via DATA wiring in a beaded connection manner. Each terminal of the LED device 140 is electrically connected to the Vdd, GND, and DATA wiring, for example, through solder, conductive adhesive, or the like.

[0037] Thus, on the LED substrate 120, multiple LED devices 140, which are daisy-chained and spaced at a certain distance in the matrix direction, are arranged in a matrix. As will be described later, the drive control unit 110 applies control data to each LED device daisy-chained via DATA wiring, and each LED device controls the light emission of its LED element based on the received control data.

[0038] In addition, Figure 3 In (A), the Vdd wiring and GND wiring extend from the drive control unit 110, but this is only one example. Alternatively, the Vdd wiring and GND wiring can extend from the power supply unit, which is separate from the drive control unit 110, on the LED substrate 120.

[0039] Figure 4This diagram illustrates the internal structure of an LED device and an example of the connection between adjacent LED devices. An LED device 140-i is configured to include LED elements (R, G, B), a brightness control unit 142, and a data holding / transmission unit 144 within a package. In the case of displaying color images, a pixel is composed of three sub-pixels: R (red), G (green), and B (blue).

[0040] The data holding / transmission unit 144 is connected to the Din and Dout terminals. When the control data input from the Din terminal includes control data destined for this station, it retrieves the control data destined for this station and stores it in a register or other memory. Conversely, when it does not contain control data destined for this station, it outputs control data from the Dout terminal and transmits the control data to the next LED device 140-j. The brightness control unit 142 controls the emission of R, G, and B based on the control data held by the data holding / transmission unit 144.

[0041] The method for transmitting control data in daisy-chained LED devices is not particularly limited; for example, it can be performed as follows: Each LED device 140 is assigned a unique address. The drive control unit 110 generates a data frame containing the address of the LED device to which the data is destined and control data. The generated data frame is then sent to the LED device 140 via DATA wiring. If LED device 140-i receives a data frame, it checks the address. If the address matches its own, it retains the control data; otherwise, it relays the data frame to the next LED device 140-j.

[0042] Next, the specific structure of the display device of the present invention will be described. Figure 5 This is a schematic perspective view of the LED substrate of the first embodiment. A plurality of daisy-chain wirings 130 are formed along the column direction on the LED substrate 120, through which a plurality of LED devices 140 are daisy-chained together. One end of each daisy-chain wiring 130 is electrically connected to a drive control unit 110, which drives each LED device 140 in the signal input direction Y1.

[0043] The LED device 140 is not driven by the matrix wiring. Therefore, for example, as shown, even if the LED substrate 120 is cut along the column direction line L1 and the unnecessary part of the substrate is removed, or even if the LED substrate 120 is cut along the row direction line L2 and the unnecessary part of the substrate is removed, the LED device 140 in the remaining area will not become non-lit, and a cuttable display can be realized.

[0044] In this way, by arranging multiple LED devices connected in a daisy chain into a matrix on the substrate, the portion other than the signal input section can be freely cut to achieve a display of the desired shape or size. Furthermore, by using a transparent substrate, a display that can be cut and pasted onto certain display media can be realized.

[0045] Figure 6 This is a schematic perspective view of the LED substrate of the second embodiment. The LED substrate 120A in both embodiments is characterized by having a comb-like (interlaced) signal input direction. Specifically, a drive control unit 110A is disposed at one end of the LED substrate 120A in the column direction, and a drive control unit 110B is disposed at the other end. Even-numbered daisy chains are electrically connected to the drive control unit 110A via wiring 130, and odd-numbered daisy chains are electrically connected to the drive control unit 110B via wiring 130. Y1 and Y2 indicate the signal input direction to the LED device 140.

[0046] For example, as shown in the figure, even if the substrate is cut along the daisy chain on line L1 in the column direction using wiring 130, no non-illuminated areas are created. Even if the substrate is cut on line L2 in the row direction, the LED devices 140A, 140B, and 140C on the back side of the cut will not light up. However, because a signal is input through the comb-shaped wiring, the LED devices 140a, 140b, and 140c in front of it will light up. Thus, in the second embodiment, only the display resolution of the non-illuminated areas becomes coarser, maintaining the display function.

[0047] Figure 7 This is a schematic perspective view of the LED substrate according to the third embodiment. In the display formed by arranging a plurality of linear LED devices as shown in the first embodiment, the LED substrate 120B of the third embodiment is characterized in that the LED devices 140 are arranged in a staggered pattern. As shown, the LED devices 140 are arranged such that the spacing between the LED devices 140 in the odd-numbered column direction is offset by 1 / 2 relative to the spacing between the LED devices 140 in the even-numbered column direction.

[0048] When multiple LED devices connected in a daisy chain are driven serially, the number of LED devices that can be connected is limited due to the driving frequency of the control data from the drive control unit 110. Therefore, in large displays, the spacing between the LED devices becomes larger, and the image appears coarse. In the third embodiment, by arranging the LED devices 140 (pixels) in a staggered pattern, the displayed image can be viewed at a high density.

[0049] Figure 8This is a diagram illustrating the daisy-chain wiring of the LED substrate according to the fourth embodiment. The LED substrate 120C of the fourth embodiment is characterized in that the DATA wiring of the daisy-chain wiring is divided into multiple parts. A linear daisy-chain wiring 130 includes, for example, two DATA1 wirings and DATA2 wirings, with the DATA1 wiring daisy-chained to the first group of LED devices 140a, 140-b, and 140-c in the linear LED devices 140-a to 140-f, and the DATA2 wiring daisy-chained to the second group of LED devices 140d, 140-e, and 140-f.

[0050] Although there is a limitation on the number of LED devices that can be connected due to the driving frequency of the control data, by dividing the DATA wiring into multiple segments as in this embodiment, the number of LED devices that can be configured on a single line can be increased, thereby improving the display resolution. Furthermore, in Figure 8 In the example, the DATA routing is divided into two parts, but it is not limited to this. The DATA routing on one line can also be divided into three or more parts.

[0051] Figure 9 This is a schematic perspective view of the LED substrate according to the fifth embodiment. In the display formed by arranging a plurality of linear LED devices as shown in the first embodiment, the LED substrate 120A of the fifth embodiment has cuts formed on the substrate (e.g., thin film substrate) of the non-mounting part of the LED devices in order to facilitate the free form of the display, thereby enabling easy cutting of the substrate and avoiding damage to the LED devices.

[0052] like Figure 9 As shown, a plurality of cuts 200 (indicated by dashed lines) are formed on the LED substrate 120D, for example, in the row and column directions. The cuts 200 are, for example, slots, holes, or recesses. By forming the cuts 200, the user can easily cut the substrate along the cuts 200. Furthermore, the cuts 200 do not necessarily have to be straight lines; they can also be curved or bent lines, or they can represent the outline of a certain shape (e.g., a circle or a rectangle).

[0053] Figure 10 This is a top view of the LED substrate according to the sixth embodiment. In the sixth embodiment, by setting the shape of the LED substrate 120E, which is provided with at least one linear LED device, to a shape such as a jigsaw puzzle pattern, the LED substrate 120E can be connected to or detached from other LED substrates 120E.

[0054] like Figure 10 As shown in (A), the LED substrate 120E includes at least one daisy-chain connected LED device 140, and has a semi-circular raised and recessed mosaic pattern 210 formed on its left and right sides. Such an LED substrate 120E can be used as a basic module, such as... Figure 10 As shown in (B), by connecting the other three LED substrates 120E, LED substrates of any size or shape can be obtained.

[0055] Here, the jigsaw puzzle pattern 210 is formed only on the left and right sides of the LED substrate 120E, but it can also be formed on the top and bottom sides, so that the size or shape of the LED substrate in the vertical direction can be varied. In addition, the shape of the jigsaw puzzle pattern is arbitrary, as long as it can be connected or disassembled (interlocked) with other LED substrates.

[0056] Furthermore, while structural examples of the LED substrate are shown in the first to fifth embodiments, the present invention may also include any combination of the first to fifth embodiments. For example, it may be an LED substrate combining the second and fifth embodiments, or an LED substrate combining the third and fourth embodiments.

[0057] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to specific embodiments and can be modified and altered in various ways within the scope of the spirit of the invention as described in the claims.

Claims

1. A display device that uses a light-emitting element, wherein, include: substrate; Daisy chain wiring formed on the substrate; as well as Multiple light-emitting devices are daisy-chained together by wiring via the daisy chain.

2. The display device according to claim 1, wherein, A daisy-chain wiring includes power wiring, GND wiring and data wiring formed in the form of lines, and multiple daisy-chain wirings are formed on the substrate.

3. The display device according to claim 2, wherein, The light-emitting device includes a power terminal, a GND terminal, a data input terminal, and a data output terminal. The power terminals and GND terminals of multiple daisy-chained light-emitting devices are connected in a common manner to the power wiring and the GND wiring. Data input terminals are connected to the data output terminals of adjacent light-emitting devices via the data wiring, and data output terminals are connected to the data input terminals of adjacent light-emitting elements via the data wiring. The light-emitting device controls the light emission based on control data received from the data input terminal.

4. The display device according to claim 3, wherein, In a substrate having multiple daisy-chain wirings, control data is supplied from the end side of the even-numbered data wiring and from the end side of the odd-numbered data wiring.

5. The display device according to claim 2, wherein, In a substrate having multiple daisy-chain wirings, the light-emitting device is arranged in an alternating pattern.

6. The display device according to claim 2, wherein, The daisy-chain wiring includes multiple data wires that are divided into multiple groups and connected to light-emitting devices arranged in a linear configuration.

7. The display device according to claim 1, wherein, The substrate has cuts formed to facilitate cutting the substrate.

8. The display device according to claim 1, wherein, At least one side of the substrate is formed with a shape that can engage with the shape of the side of other substrates.

9. The display device according to claim 1, wherein, The substrate is a transparent, film-like substrate.

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