TWM613878U - Display device - Google Patents

Abstract

A display device including stacked first substrate, second substrate, and third substrate, and first and second cholesteric liquid crystal layers disposed therebetween is provided. The first substrate has a first top surface with a first side. At least one first contact is disposed on the first top surface and along the first side. The second substrate has a second top surface with a second side parallel to the first side. The part of the first top surface bearing the first contact protrudes out of the second side. At least one second contact is disposed on the second top surface and along the second side. The third substrate has a third side parallel to the first side, where the part of the second top surface bearing the second contact protrudes out of the third side.

Description

Display device

This creation is about a display device; specifically, this creation is about a display device containing a cholesteric liquid crystal layer.

With the continuous evolution of display technology, the related technology of cholesteric liquid crystal display has also been paid more and more attention. For example, in e-books or other devices, the cholesteric liquid crystal display technology is widely used because of its power-saving characteristics and the characteristics of not necessarily requiring a backlight.

Figure 1 shows a schematic diagram of a conventional color cholesteric liquid crystal display. As shown in FIG. 1, a traditional color cholesteric liquid crystal display is usually composed of a red panel 1, a green panel 2 and a blue panel 3 superimposed and combined. The red panel 1, the green panel 2 and the blue panel 3 can be connected with a medium such as optical glue to produce a color display effect. However, since each color panel includes upper and lower substrates and a cholesteric liquid crystal layer sandwiched between them, for example, the red panel 1 has a first substrate 31, a second substrate 32 and a cholesteric liquid crystal layer 51 therebetween; the green panel 2 has a third The substrate 33, the fourth substrate 34 and the cholesteric liquid crystal layer 52 therebetween; and the blue panel 3 has the fifth substrate 35, the sixth substrate 36 and the cholesteric liquid crystal layer 53 therebetween; therefore, at least six substrates are needed. In other words, the thickness and weight of the color cholesteric liquid crystal display will be difficult to reduce, and there are limitations in design.

One purpose of this creation is to provide a display device that can improve the convenience of assembly.

Another purpose of the present creation is to provide a display device that can reduce the difficulty of joining connection lines.

Another purpose of the present invention is to provide a display device that can reduce the amount of substrates.

The display device of the present invention includes a first substrate, a second substrate, and a third substrate that are overlapped. A first cholesteric liquid crystal layer is sandwiched between the first substrate and the second substrate; a second cholesteric liquid crystal layer is sandwiched between the second substrate and the third substrate. The first substrate has a first top surface, and the first top surface has a first side edge; wherein the first top surface is provided with at least one first contact along the first side edge. The second substrate has a second top surface facing away from the first substrate, and the second top surface has a second side edge parallel to the first side edge; wherein the portion of the first top surface carrying the first contact point protrudes from the first side edge. Beyond the two sides. At least one second contact is provided along the second side on the second top surface; the third substrate has a third side parallel to the first side, and the second top surface carries a portion of the second contact The tie protrudes beyond the third side.

With the above arrangement, a stepwise step design is adopted on the side of the display device, so that the contacts on the lower substrate are not blocked by the upper substrate, and can be easily joined and assembled with the connecting lines.

The following will clearly illustrate the spirit of the present disclosure with diagrams and detailed descriptions. Anyone with ordinary knowledge in the technical field who understands the embodiments of the present disclosure can change and modify the techniques taught in the present disclosure. It does not depart from the spirit and scope of this disclosure.

Regarding the "first", "second", etc. used in this text, they do not specifically refer to order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described in the same technical terms. Regarding the "include", "include", "have", "contain", etc. used in this article, they are all open terms, which means including but not limited to.

Regarding the terms used in this article, unless otherwise specified, each term usually has the usual meaning of each term used in this field, in the content disclosed here, and in the special content. Some terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance on the description of the present disclosure.

In the drawings, the thickness of layers, panels, regions, or spaces, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, board, region or space is referred to as being "on" or "connected to" another element, it can be interpreted as being directly on or with another element. Connected, or can be interpreted as having or presence of intermediate elements between the element and another element. As used herein, "connected" or "coupled" can refer to physical and/or electrical connections. Furthermore, in order to simplify the drawings and highlight the content to be presented in the drawings, the conventional structures or elements in the drawings may be drawn in a simple schematic manner or presented in an omitted manner.

An embodiment of the present invention provides a display device. Preferably, the display device is a display device that uses a cholesteric liquid crystal layer for display control.

In the embodiment shown in FIG. 2A and FIG. 2B, the display device includes a first substrate 100, a second substrate 200, a third substrate 300, and a fourth substrate 400 that are stacked. A first cholesteric liquid crystal layer 501 is sandwiched between the first substrate 100 and the second substrate 200; a second cholesteric liquid crystal layer 502 is sandwiched between the second substrate 200 and the third substrate 300; between the third substrate 300 and the fourth substrate 400 A third cholesteric liquid crystal layer 503 is sandwiched. One or more first display element layers 601 for controlling the first cholesteric liquid crystal layer 501 for display are additionally provided between the first substrate 100 and the second substrate 200; the first display element layer 601 includes, but is not limited to, a thin film transistor control circuit , Black matrix, spacer layer, alignment layer, etc. Similarly, one or more second display element layers 602 for controlling the second cholesteric liquid crystal layer 502 for displaying are additionally provided between the second substrate 200 and the third substrate 300, and the third substrate 300 and the fourth substrate 400 are additionally provided There are one or more third display element layers 603 that control the third cholesteric liquid crystal layer 503 for displaying.

As shown in FIGS. 2A and 2B, the first substrate 100 has a first top surface 110 facing the second substrate 200, and the first top surface 110 has a first side 111. At least one first contact 130 is provided on the first top surface 110 along the first side 111. The first contact 130 is preferably provided outside the visible area formed by the first cholesteric liquid crystal layer 501 and close to the first cholesteric liquid crystal layer 501. Side 111. In this embodiment, a single first contact 130 is provided on the first top surface 110, but a plurality of first contacts 130 can also be provided according to the size and resolution of the display device. In addition, the first contact 130 is not limited to a single electrical connection pad, and can also be a contact composed of a plurality of electrical connection pads for connecting with the connection ends of the connection lines.

Similarly, the second substrate 200 is opposite to the first substrate 100 and has a second top surface 210 facing the third substrate 300, and the second top surface 210 has a second side 211 parallel to the first side 111. At least one second contact 230 is provided on the second top surface 210 along the second side 211. The second contact 230 is preferably provided outside the visible area formed by the second cholesteric liquid crystal layer 502 and close to the second边边211. In this embodiment, a single second contact 230 is provided on the second top surface 210, but a plurality of second contacts 230 can also be provided according to the size and resolution of the display device. The third substrate 300 is opposite to the second substrate 200 and has a third top surface 310 facing the fourth substrate 400, and the third top surface 310 has a third side 311 parallel to the first side 111. At least one third contact 330 is provided on the third top surface 310 along the third side 311. The third contact 330 is preferably located outside the visible area formed by the third cholesteric liquid crystal layer 503 and close to the third side边311. In this embodiment, a single third contact 330 is provided on the third top surface 310, but a plurality of third contacts 330 can also be provided according to the size and resolution of the display device.

As shown in FIGS. 2A and 2B, the part of the first top surface 110 carrying the first contact 130 protrudes beyond the second side 211, so when the connecting line is joined to the first contact 130, it is not It will be blocked by the second substrate 200. Similarly, the part of the second top surface 210 that carries the second contact 230 protrudes beyond the third side 311, so when the connection line is joined to the second contact 230, it will not be affected by the third substrate 300. Blocked; the part of the third top surface 310 carrying the third contact 330 protrudes beyond the fourth side 411, so when the connection line is joined to the third contact 330, it will not be blocked by the fourth substrate 400 . The above-mentioned joining relationship between the connecting line and each contact can be, for example, thermocompression welding, but it is not limited to this.

In this embodiment, four substrates are used, and a stepwise step design is adopted on the side of the display device, so that the contacts on the lower substrate are not blocked by the upper substrate, and can be easily connected to the connecting lines. Assembly. It should be particularly noted that in different embodiments, fewer substrates can also be used to achieve similar technical effects. In addition, as shown in FIGS. 2A and 2B, the first side 111, the second side 211, the third side 311, and the fourth side 411 are substantially located on the same side of the display device and are substantially parallel to each other. However, in different embodiments, the first side 111, the second side 211, the third side 311, and the fourth side 411 are not limited to being completely parallel. They can also be in the same direction when entering and exiting at a slight angle. extend.

In one embodiment, as shown in FIG. 3A, the first substrate 100 and the second substrate 200 and the first display element layer 601 between them can be processed first to form the first panel 10; and then the third substrate 300 can be processed. And the fourth substrate 400 and the third display element layer 603 therebetween to form the second set of panels 20. Then, as shown in FIG. 3B, a second display element layer 602, such as a thin film transistor control circuit, a black matrix, a spacer layer, and a second top surface 210 of the second substrate 200 and a bottom surface 301 of the third substrate 300, are respectively provided Alignment layer, etc. Since the components in the first panel 10 and the second panel 20 are completed when this step is performed, and some components cannot withstand high-temperature processes, low-temperature processes, such as low-temperature polysilicon processes, etc., can be used. In contrast, the elements in the second display element layer 602 also have properties produced by a low-temperature process, such as mechanical and electrical properties. Next, as shown in FIG. 3C, the first group of panels 10 and the second group of panels 20 are combined, and a similar process such as liquid crystal filling is performed. Then, as shown in FIG. 3D, the edges of the second substrate 200, the third substrate 300, and the fourth substrate 400 are respectively cut to form a stepped structure at the end of the panel, so that the part of each substrate carrying the contact is not blocked , In order to facilitate the connection with the connection line.

In the embodiment shown in FIG. 4, a first color resist layer 710 is further provided between the second substrate 200 and the first cholesteric liquid crystal layer 501. In other words, the first color resist layer 710 is directly or indirectly disposed on the bottom surface of the second substrate 200 facing the first substrate 100. A second color resist layer 720 is further provided between the third substrate 300 and the third cholesteric liquid crystal layer 503. In other words, the second color resist layer 720 is directly or indirectly disposed on the third top surface 310 of the third substrate 300 facing the fourth substrate 400. The color band of the color light filtered by the first color resist layer 710 can be matched with the first cholesteric liquid crystal layer 501, and the color band of the color light filtered by the second color resist layer 720 can be matched with the third cholesteric liquid crystal layer 503. For example, when the display color light provided by the first cholesteric liquid crystal layer 501 (for example, through reflection) is red, the first color resist layer 710 can be configured to allow red light to pass through to increase the chroma of the red light. For another example, when the display color light provided by the third cholesteric liquid crystal layer 503 (for example, through reflection) is blue, the second color resist layer 720 can be configured to allow yellow light to pass through, so as to enhance the filtering of blue light; therefore, The chroma of the overall display can be improved by reducing the chance of blue light entering the first and second cholesteric liquid crystal layers 501/502 below.

As shown in FIG. 5, in this embodiment, the first contacts 130 and the second contacts 230 are staggeredly distributed in the direction along the first side 111. Specifically, the projection ranges of the first contact 130 and the second contact 230 on the first side 111 intersect each other. In addition, as shown in FIG. 5, the display device further includes a circuit substrate 800, a first connection line 810, a second connection line 820, and a third connection line 830. The circuit substrate 800 can be, for example, a flexible substrate of a chip-on-film package (COF), or other different types of substrates for carrying driving circuits or for other purposes. The circuit substrate 800 is arranged to extend along the first side 111, and has a first-level connection 801 and a second-level connection 802 distributed along the first side 111, and the second-level connection 802 is more connected than the first The part 801 is close to the first side 111. Specifically, the first-stage connecting portion 801 and the second-stage connecting portion 802 are parts of different sections on the side of the circuit substrate 800 close to the first side 111; wherein the first-stage connecting portion 801 is opposite to the second connecting portion. 802 is relatively retracted, and the second-stage connecting portion 802 is relatively outwardly protruding relative to the first-stage connecting portion 801. With this arrangement, the first-level connecting portion 801 and the second-level connecting portion 802 also form a stepped shape on the side of the circuit substrate 800 close to the first side 111. Similarly, the circuit substrate 800 can also have two third-level connection portions 803, the first-level connection portions 801 and the second-level connection portions 802 arranged side by side, and are distributed along the first side 111 together.

As shown in FIG. 5, the first connection line 810, the second connection line 820, and the third connection line 830 are respectively connected between the first contact 130 and the first-level connection portion 801, and the second contact 230 and the second-level Between the connecting portions 802 and between the third contact 330 and the third-level connecting portion 803. Preferably, the first connection line 810, the second connection line 820, and the third connection line 830 have the same or similar lengths to reduce the problem of signal impedance matching. With the above-mentioned design, the same circuit substrate 800 can be connected to the contacts on different substrates respectively, and the effects of saving space and reducing cost can still be achieved in the state of cooperating with different driving circuits.

However, in different embodiments, multiple circuit substrates 800 may be provided with contacts corresponding to different substrates, respectively. For example, as shown in FIG. 6, the projection ranges of the first contact 130 and the second contact 230 on the first side 111 partially overlap or completely overlap. At this time, the display device may include a first circuit substrate 901, a second circuit substrate 902, and a third circuit substrate 903, which have a first connection portion 910, a second connection portion 920, and a third connection portion 930, respectively. The first connection portion 910, the second connection portion 920, and the third connection portion 930 are connected to the first contact 130 and the second contact 230 through the first connection line 810, the second connection line 820, and the third connection line 830, respectively. And the third contact 330 are electrically connected. The first circuit substrate 901, the second circuit substrate 902, and the third circuit substrate 903 are at least partially overlapped with each other directly or at intervals. With this arrangement, since the circuit substrates are arranged separately rather than concentratedly, it will provide more flexibility in design and manufacturing, such as reducing the difficulty of heavy work.

In the embodiment shown in FIG. 7, the display device further includes at least one supporting unit 550 disposed between the first top surface 110 and the second substrate 200. The supporting unit 550 can be arranged in a manner of dots or wiring. The first cholesteric liquid crystal layer 501 has an encapsulant 570, the inside of the encapsulant 570 is the visible area, and the supporting unit 550 is disposed outside the encapsulant 570. Similarly, between the second substrate 200 and the third substrate 300 and between the third substrate 300 and the fourth substrate 400, a supporting unit 550 can also be provided as needed. Preferably, at least part of the supporting unit 550 is located below the portion of the second top surface 210 that protrudes from the third side 311 or below the portion of the third top surface 310 that protrudes from the fourth side 411. Since part of the substrate extends farther from the sealing compound 570, the support unit 550 is provided to improve the stability of the structure and reduce the chance of breakage.

In addition, the stepped design of the side of the display device is not limited to being arranged on a single side. For example, in the embodiment shown in FIG. 8, the first top surface 110 has a first opposite side 115 opposite to the first side 111. At least one first opposite contact 150 is provided on the first top surface 110 along the first opposite side 115. Similarly, the second top surface 210 has a second opposite side 215 opposite to the second side 211; the second top surface 210 is provided with at least one second opposite contact 250 along the second opposite side 215 . The part of the first top surface 110 carrying the first opposite contact 150 protrudes beyond the second opposite side 215, and the part of the second top surface 210 carrying the second opposite contact 250 protrudes from the first Outside the third substrate 300. With this arrangement, the display device can be connected to the connection lines on different sides.

In the embodiment shown in FIG. 9, the first top surface 110 has a first adjacent side 117 adjacent to the first side 111; the first top surface 110 is disposed along the first adjacent side 117 There is at least one first adjacent side contact 170. The second top surface 210 has a second adjacent side 217 adjacent to the second side 211; the second top surface 210 is provided with at least one second adjacent side contact 270 along the second adjacent side 217 . The part of the first top surface 110 carrying the first adjacent side contact 170 protrudes beyond the second adjacent side 217, and the second top surface 210 carries the part of the second adjacent side contact 270 protruding Outside the third substrate 300. With this arrangement, the connection line can be joined on the adjacent sides of the display device.

In the embodiment shown in FIG. 10, the first top surface 110 is provided with a plurality of first contacts 130 distributed along the first side 111, and the second top surface 210 is provided with a plurality of first contacts 130 along the second side. 211 second contacts 230 distributed. At least part of the first contact 130 and the second contact 230 are covered with an insulating layer 990. Preferably, the insulating layer 990 covering the first contact 130 and the insulating layer covering the second contact 230 are staggered in the direction along the first side 111; in other words, the insulating layer 990 covering both The projection range on the first side 111 is alternately distributed. With this arrangement, the first substrate 100 and the second substrate 200 can be separately processed with the same mask pattern, such as a metal layer, to complete the contact setting. Then, the insulating layer 990 is used to cover the positions of the unneeded contacts, while leaving the first contact 130 and the second contact 230 that need to be used. In this way, the versatility of the photomask can be increased, and the cost of the manufacturing process can be reduced.

This creation has been described by the above related embodiments, but the above implementation is included in the scope of this creation. The examples are only examples for implementing this creation. It must be pointed out that the disclosed embodiments do not limit the scope of this creation. On the contrary, modifications and equalization of the spirit and scope included in the scope of the patent application are all included in the scope of this creation.

10: The first panel 20: The second set of panels 100: first substrate 110: first top surface 111: first side 115: first pair of sides 117: first adjacent side 130: first contact 150: The first opposite contact 170: The first adjacent side contact 200: second substrate 210: second top surface 211: second side 215: second opposite side 217: second adjacent side 230: second contact 250: second opposite contact 270: second adjacent side contact 300: third substrate 310: third top surface 311: third side 330: third contact 400: Fourth substrate 411: fourth side 501: The first cholesteric liquid crystal layer 502: second cholesteric liquid crystal layer 503: third cholesteric liquid crystal layer 550: Support unit 570: Sealant 601: the first display element layer 602: second display element layer 603: third display element layer 710: first color resist layer 720: second color resist layer 800: circuit board 801: First-stage connection 802: Second-stage connection 803: Third-stage connection 810: The first connection line 820: second connection line 830: third connection line 901: The first circuit board 902: second circuit board 903: The third circuit board 910: The first connection part 920: The second connecting part 930: The third connecting part 990: insulating layer

Figure 1 is a schematic cross-sectional view of a conventional display device;

Figure 2A is an exploded view of an embodiment of the creative display device;

2B is a schematic cross-sectional view of the embodiment shown in FIG. 2A;

3A to 3D are schematic diagrams of embodiments of the production process of the display device;

4 is a schematic cross-sectional view of another embodiment of the display device;

Figure 5 is a top view of an embodiment of a display device;

Figure 6 is a top view of another embodiment of the display device;

FIG. 7 is a schematic cross-sectional view of another embodiment of the display device;

Figure 8 is a top view of another embodiment of the display device;

Figure 9 is a top view of another embodiment of the display device;

Fig. 10 is a top view of another embodiment of the display device.

100: first substrate

110: first top surface

111: first side

130: first contact

200: second substrate

210: second top surface

211: second side

230: second contact

300: third substrate

310: third top surface

311: third side

330: third contact

400: Fourth substrate

411: fourth side

501: The first cholesteric liquid crystal layer

502: second cholesteric liquid crystal layer

503: third cholesteric liquid crystal layer

570: Sealant

601: the first display element layer

602: second display element layer

603: third display element layer

Claims (12)

A display device comprising: a first substrate having a first top surface, the first top surface has a first side edge; wherein the first top surface is provided with at least one first connection along the first side edge Point; a second substrate is disposed opposite to the first top surface, and a first cholesteric liquid crystal layer is sandwiched between the first substrate, the second substrate has a second top surface facing away from the first substrate, The second top surface has a second side edge extending in the same direction as the first side edge; wherein the second top surface is provided with at least one second contact along the second side edge; the first top surface carries The part with the first contact point protrudes beyond the second side edge; and a third substrate is disposed opposite to the second top surface, and a second cholesteric liquid crystal layer is sandwiched between the second substrate The third substrate has a third side edge extending in the same direction as the first side edge, and the portion of the second top surface carrying the second contact point protrudes outside the third side edge. The display device according to claim 1, wherein the first contacts and the second contacts are staggeredly distributed in a direction along the first side. The display device according to claim 2, further comprising: a circuit substrate arranged to extend along the first side, and having a first-level connecting portion and a second-level connecting portion distributed along the first side ; Wherein, the second-level connection part is closer to the first side than the first-level connection part; a first connection line is coupled between the first contact and the first-level connection part; and A second connecting line is arranged side by side with the first connecting line and coupled between the second contact and the second-stage connecting portion. In the display device according to claim 2, wherein the first top surface is provided with a plurality of the first contacts distributed along the first side, and at least part of the first contacts is covered with an insulating layer. The display device according to claim 1, further comprising: a first circuit substrate, which is arranged outside the first side and has a first connection portion corresponding to the first contact; a first connection The circuit is coupled between the first contact and the first connecting portion; a second circuit substrate is arranged outside the first side and has a second corresponding to the second contact Connecting portion; and a second connecting line coupled between the second contact and the second-level connecting portion; wherein the first contact and the second contact are on the first side The projection range at least partially overlaps, and the first circuit substrate and the second circuit substrate at least partially overlap. The display device according to claim 1, wherein the first top surface has a first opposite side opposite to the first side; the first top surface is provided with at least A first opposite contact; the second top surface has a second opposite side opposite to the second side; the second top surface is provided with at least one second opposite side along the second opposite side Opposing contacts; the first top surface carrying the first opposing contact protrudes beyond the second opposing side, and the second top surface carries the second opposing contact Part of it protrudes beyond the third substrate. The display device according to claim 1, wherein the first top surface has a first adjacent side adjacent to the first side; the first top surface is arranged along the first adjacent side There is at least one first adjacent side contact; the second top surface has a second adjacent side adjacent to the second side; the second top surface is arranged along the second adjacent side There is at least one second adjacent side contact; the first top surface carries The part with the first adjacent side contact protrudes beyond the second adjacent side, and the part of the second top surface carrying the second adjacent side contact protrudes from the third substrate outer. The display device according to claim 1, further comprising at least one support unit disposed between the first top surface and the second substrate, wherein the first cholesteric liquid crystal layer has a sealant, and the support unit is located on the sealant Outside. The display device according to claim 8, wherein at least part of the supporting unit is located below the portion of the second top surface protruding from the third side edge. The display device according to claim 1, further comprising a fourth substrate; wherein the third substrate has a third top surface facing away from the second substrate, and the third top surface has the third side; wherein the At least one third contact is provided along the third side on the third top surface; the fourth substrate is disposed opposite to the third top surface, and a third cholesteric liquid crystal layer is sandwiched between the third substrate, and The fourth substrate has a fourth side extending in the same direction as the first side, and a part of the third top surface carrying the third contact protrudes outside the fourth side. The display device according to claim 10, further comprising: a first color resist layer disposed between the second substrate and the first cholesteric liquid crystal layer; and a second color resist layer disposed on the third Between the substrate and the third cholesteric liquid crystal layer. The display device according to claim 10, further comprising: a first display element layer disposed between the first top surface and the second substrate; a second display element layer disposed on the second top surface and Between the third substrate; and a third display element layer disposed between the third top surface and the fourth substrate; wherein, the second display element layer has properties made by a low-temperature process.

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