Flexible Local dimming structure of curved display screen

Abstract

The invention discloses a flexible Local diameter structure of a curved-surface display screen, and relates to the field of curved-surface display screens, the flexible Local diameter structure comprises a flexible substrate, and the flexible substrate is provided with a plurality of bowl-shaped mounting grooves arranged in a matrix; the light-emitting chip is mounted in the bowl-shaped mounting groove; the copper circuit is arranged on the flexible substrate and is provided with at least one positioning bracket for positioning the light-emitting chip; the heat dissipation piece is used for dissipating heat of the light-emitting chip; the surrounding edge is arranged outside the flexible substrate; according to the invention, the elastic contact element deforms due to extrusion at first, so that not only can a sealing effect be achieved, glue is prevented from overflowing, but also the flexible flow guide element can be inclined due to inflation, and after the optical glue layer is extruded, the glue flows towards the outer side and flows into the concentric-square-shaped accommodating groove along the flexible flow guide element, so that the glue can be further prevented from overflowing; therefore, the manufacturing process of the curved screen is simplified, and the probability that the liquid optical glue flows to the working table top during glue dispensing can be reduced by utilizing the two interception defense lines, namely the inner side edge and the outer side edge.

Description

Technical Field

[0001] The present invention relates to the technical field related to curved display screens, and in particular to a flexible Localdimming structure of a curved display screen. Background Art

[0002] Local dimming technology (i.e. local backlight adjustment) means dividing the matrix-arranged backlight into several areas, and each area can adjust the brightness independently. In this way, when a certain area in the image needs to display dark details, it is only necessary to lower the backlight brightness of that area, while the backlight brightness of other areas remains unchanged.

[0003] For example, the utility model patent with application number 202321105179.8 discloses a flexible LOCALDIMMING structure for a curved display screen, comprising a flexible substrate, on which a plurality of parallel copper wiring strips are provided, above which a plurality of LED wafers are provided, above which a solid crystal sealant is provided, and between which adjacent copper wiring strips are filled white oil, and above which an OCA layer is provided; by using FILM film (i.e. polyester film) or FPC film (i.e. polyimide film) as the substrate, the LED wafers can be bound more densely, finer brightness and color can be achieved, and at the same time, the curved screen product can be made thinner and lighter.

[0004] However, the above-mentioned prior art still has the following shortcomings: the flexible substrate does not have an anti-overflow glue structure. When the flexible LOCAL DIMMING structure is pasted with the help of liquid optical glue (OCA layer), the liquid optical glue is easy to overflow. Subsequently, a cutting device is required to cut off the overflowed solidified optical glue, which is not conducive to simplifying the production process of the curved display screen. In addition, the liquid optical glue is also easy to flow onto the work surface during dispensing. If it is not cleaned in time, it will contaminate the workpiece on the work surface. Summary of the invention

[0005] In order to solve the defects in the prior art, the present invention provides a flexible local dimming structure for a curved display screen.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention discloses a flexible local dimming structure for a curved display screen, comprising a flexible substrate, on which a plurality of bowl-shaped mounting grooves arranged in a matrix are provided; A light emitting chip mounted in the bowl-shaped mounting groove; A copper circuit arranged on a flexible substrate, wherein at least one positioning bracket for positioning a light-emitting chip is provided on the copper circuit; A heat sink for dissipating heat from the light-emitting chip, wherein the heat sink is embedded on the flexible substrate; A surrounding edge is arranged outside the flexible substrate, the surrounding edge is used to prevent glue from overflowing, and a circular receiving groove is provided on the surrounding edge for receiving overflowed glue. The surrounding edge is divided into an inner side edge that is in contact with the flexible substrate and an outer side edge that is parallel to the inner side edge and has the same height as the inner side edge through the circular receiving groove, an elastic contact piece with a C-shaped cross-section is provided on the top of the outer side edge, and a flexible guide piece that is smoothly connected to the inner side edge is provided in the circular receiving groove.

[0007] As a preferred technical solution of the present invention, a cavity is provided in the flexible guide member, and an air guide cavity with a U-shaped cross-section is provided in the surrounding edge, and the air guide cavity is connected with the cavity through an arc-shaped air channel.

[0008] As a preferred technical solution of the present invention, an extrusion air cavity with a C-shaped cross-section is provided on the elastic contact piece, and the extrusion air cavity is communicated with the air guide air cavity.

[0009] As a preferred technical solution of the present invention, the heat sink includes a heat sink frame and a plurality of heat conductors arranged in a matrix, the heat sink frame is provided with heat sink strips distributed in a side-by-side manner, and the heat conductors are distributed on the heat sink frame and the heat sink strips.

[0010] As a preferred technical solution of the present invention, the heat dissipation frame and the heat dissipation strips are both arranged on the back of the flexible substrate and do not protrude from the flexible substrate, and a plurality of through holes are formed on the heat dissipation frame and the heat dissipation strips.

[0011] As a preferred technical solution of the present invention, a conductive block in contact with the copper circuit is provided at the bottom of the light-emitting chip, and four insulating positioning blocks distributed in a rectangular shape are provided outside the conductive block.

[0012] As a preferred technical solution of the present invention, the positioning bracket includes two middle protrusions that are symmetrically distributed and fit with the conductive block, and two auxiliary protrusions that are symmetrically distributed and fit with the conductive block are provided outside the middle protrusion. A positioning opening that matches the insulating positioning block is formed between the middle protrusion and the auxiliary protrusion.

[0013] As a preferred technical solution of the present invention, an insulator is further provided in the bowl-shaped installation groove, and a through hole is provided on the insulator for allowing the heat conductor to pass through.

[0014] As a preferred technical solution of the present invention, the front side of the flexible substrate and the inner wall of the bowl-shaped mounting groove are both provided with a white oil layer formed by coating, the bowl-shaped mounting groove is provided with a solid crystal glue for protecting the light-emitting chip, and the top of the solid crystal glue is provided with an optical glue layer.

[0015] As a preferred technical solution of the present invention, the height of the inner side edge is higher than the flexible substrate, and the inner side edge cooperates with the flexible substrate to form a receiving groove for receiving the optical adhesive layer.

[0016] The beneficial effects of the present invention are: 1. In the flexible local dimming structure of this curved display screen, the elastic contact part is first deformed due to extrusion, which not only plays a sealing role to prevent the liquid optical glue from overflowing, but also the gas in the extruded air cavity will flow into the cavity through the air guide cavity, so that the flexible guide part is tilted due to inflation. After the optical glue layer is squeezed, the glue will flow outward and flow into the round-shaped receiving groove along the flexible guide part. The overflowed glue is accommodated by the round-shaped receiving groove, which can further prevent the liquid optical glue from overflowing, thereby simplifying the production process of the curved screen. In addition, the use of the two interception defense lines of the inner side and the outer side can also reduce the probability of the liquid optical glue flowing onto the work surface during dispensing.

[0017] 2. The flexible local dimming structure of this curved display screen uses a heat dissipation frame and heat dissipation strips to support the heat conductor. Compared with setting the heat conductor alone, the heat dissipation area can be increased, and the through holes set on the heat dissipation frame and the heat dissipation strips are conducive to bending the flexible substrate.

[0018] 3. The flexible local dimming structure of this curved display screen can limit the conductive block through the middle bump and the auxiliary bump, and can limit the insulating positioning block through the positioning port, thereby realizing rapid positioning of the light-emitting chip and reducing the probability of displacement of the installed light-emitting chip position.

[0019] 4. The flexible local dimming structure of this curved display screen can not only effectively reduce the leakage current of adjacent copper circuits and reduce energy consumption through insulators, but also conduct the heat generated by the copper circuits and light-emitting chips during operation to the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a flexible local dimming structure (optical adhesive layer omitted) of a curved display screen of the present invention; Figure 2 It is a schematic diagram of the back structure of a flexible local dimming structure of a curved display screen of the present invention; Figure 3 It is a structural schematic diagram of a flexible local dimming structure (optical adhesive layer omitted) of a curved display screen in a compressed state according to the present invention; Figure 4It is a structural schematic diagram of a flexible local dimming structure of a curved display screen (optical adhesive layer and die-bonding adhesive are omitted) of the present invention; Figure 5 It is a structural schematic diagram of a flexible local dimming structure of a curved display screen (omitted optical adhesive layer, solid crystal adhesive and light-emitting chip); Figure 6 It is a three-dimensional cross-sectional view of a flexible local dimming structure of a curved display screen (optical adhesive layer and die-bonding adhesive are omitted) of the present invention; Figure 7 The invention discloses a flexible local dimming structure for a curved display screen. Figure 6 Enlarged view of point A in the middle; Figure 8 It is a structural schematic diagram of a flexible local dimming structure (optical adhesive layer and die-bonding adhesive omitted) of a curved display screen in a compressed state according to the present invention; Fig. 9 The invention discloses a flexible local dimming structure for a curved display screen. Figure 8 Enlarged view of point B in the middle; Fig.10 It is a schematic diagram of the connection structure between a light-emitting chip and a copper circuit of a flexible local dimming structure of a curved display screen of the present invention; Fig.11 It is a schematic diagram of a light-emitting chip and a copper circuit structure of a flexible local dimming structure of a curved display screen of the present invention; Fig.12 It is a schematic diagram of a heat sink structure of a flexible local dimming structure of a curved display screen of the present invention; Fig.13 It is a cross-sectional view of a flexible local dimming structure of a curved display screen of the present invention; Fig.14 It is a cross-sectional view of a flexible local dimming structure of a curved display screen of the present invention in a compressed state.

[0021] In the figure: 1. flexible substrate; 11. bowl-shaped mounting groove; 12. insulator; 2. solid crystal glue; 3. surrounding edge; 31. round-shaped receiving groove; 32. air guide cavity; 33. cavity; 34. arc-shaped air channel; 35. flexible flow guide; 36. elastic contact member; 4. heat dissipation frame; 41. heat conductor; 42. through hole; 5. light-emitting chip; 51. conductive block; 52. insulating positioning block; 6. copper circuit; 61. middle bump; 62. positioning port; 63. auxiliary bump; 7. optical adhesive layer. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] Example: Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a flexible local dimming structure of a curved display screen of the present invention comprises a flexible substrate 1, on which a plurality of bowl-shaped mounting grooves 11 arranged in a matrix are provided; The light emitting chip 5 is installed in the bowl-shaped installation groove 11; A copper circuit 6 arranged on the flexible substrate 1, wherein the copper circuit 6 is provided with at least one positioning bracket for positioning the light-emitting chip 5; A heat sink for dissipating heat from the light-emitting chip 5, wherein the heat sink is embedded on the flexible substrate 1; A peripheral edge 3 is arranged outside the flexible substrate 1, and the peripheral edge 3 is used to prevent glue from overflowing. A circular receiving groove 31 is provided on the peripheral edge 3 for receiving overflowing glue. The peripheral edge 3 is divided into an inner side edge that is in contact with the flexible substrate 1 and an outer side edge that is parallel to and has the same height as the inner side edge through the circular receiving groove 31. An elastic contact member 36 with a C-shaped cross-section is provided on the top of the outer side edge, and a flexible guide member 35 smoothly connected to the inner side edge is provided in the circular receiving groove 31. The probability of glue overflow can be effectively reduced by using the two interception defense lines of the inner side edge and the outer side edge.

[0024] The elastic contact piece 36 is higher than the outer side and the inner side. Therefore, when the flexible local dimming structure is attached to the curved display screen, the elastic contact piece 36 is first deformed due to being squeezed, and the gas in the squeezed air cavity will flow into the cavity 33 through the air guide cavity 32, so that the flexible guide piece 35 is tilted due to inflation to form an inclined surface with a guide function. Then the flexible local dimming structure will be attached to the curved display screen due to the optical adhesive layer 7. After the optical adhesive layer 7 is squeezed, the glue will flow outward and then flow into the round-shaped receiving groove 31 along the flexible guide piece 35. The round-shaped receiving groove 31 is used to accommodate the overflowed glue, thereby effectively preventing the liquid optical adhesive from overflowing.

[0025] It should be noted that there are multiple arrays of light-emitting chips 5. To make the drawings clear, the number of light-emitting chips 5 in the drawings is simplified. The actual number of light-emitting chips 5 is several hundred or even thousands.

[0026] Among them, Figure 7 and Fig. 9As shown, a cavity 33 is provided in the flexible guide member 35, and an air guide cavity 32 with a U-shaped cross-section is provided in the surrounding edge 3. The air guide cavity 32 is connected to the cavity 33 via an arc-shaped air channel 34, and the extrusion cavity, the cavity 33 and the air guide cavity 32 are filled with gas.

[0027] Among them, Figure 7 and Fig. 9 As shown, the elastic contact member 36 is provided with an extrusion air cavity with a C-shaped cross-section, and the extrusion air cavity is connected with the air guide cavity 32. After the elastic contact member 36 is extruded, the gas in the extrusion air cavity will flow from the air guide cavity 32 into the cavity 33, so that the flexible guide member 35 is inclined due to inflation to form an inclined surface with a guiding function. The inclined flexible guide member 35 can guide the overflowed liquid optical adhesive to flow into the circular receiving groove 31, which can effectively avoid the overflow of the liquid optical adhesive.

[0028] Among them, Figure 2 and Fig.12 As shown, the heat sink includes a heat sink frame 4 and a plurality of heat conductors 41 arranged in a matrix. The heat sink frame 4 is provided with heat sink strips distributed in a side-by-side manner, and the heat conductors 41 are distributed on the heat sink frame 4 and the heat sink strips. The heat sink frame 4 and the heat sink strips are used to support the heat conductors 41, which can increase the heat dissipation area compared to arranging the heat conductors 41 separately.

[0029] Among them, Figure 2 and Fig.12 As shown, the heat dissipation frame 4 and the heat dissipation strip are both arranged on the back of the flexible substrate 1 and do not protrude from the flexible substrate 1 . The heat dissipation frame 4 and the heat dissipation strip are both provided with a plurality of through holes 42 . The provision of the through holes 42 is conducive to bending the flexible substrate 1 .

[0030] Among them, Fig.10 and Fig.11 As shown, a conductive block 51 in contact with the copper circuit 6 is provided at the bottom of the light-emitting chip 5, and four insulating positioning blocks 52 distributed in a rectangular shape are provided outside the conductive block 51. The conductive block 51 can be fixed on the copper circuit 6 by soldering, and the insulating positioning blocks 52 serve to position the light-emitting chip 5.

[0031] Among them, Fig.10 and Fig.11As shown, the positioning bracket includes two middle protrusions 61 which are symmetrically distributed and fit with the conductive block 51, and two auxiliary protrusions 63 which are symmetrically distributed and fit with the conductive block 51 are provided outside the middle protrusion 61. A positioning opening 62 which matches the insulating positioning block 52 is formed between the middle protrusion 61 and the auxiliary protrusion 63. The conductive block 51 can be limited by the middle protrusion 61 and the auxiliary protrusion 63, and the insulating positioning block 52 can be limited by the positioning opening 62, so as to realize the rapid positioning of the light-emitting chip 5 and reduce the probability of displacement of the installed position of the light-emitting chip 5.

[0032] Among them, Figure 5 As shown, an insulator 12 is also provided in the bowl-shaped mounting groove 11, and a through hole is opened on the insulator 12 for accommodating the heat conductor 41 to pass through. The insulator 12 is made of a thermally conductive elastic material, such as thermally conductive silicone, which can effectively reduce the leakage current of the adjacent copper circuit 6, thereby reducing energy consumption, and can also conduct the heat generated by the copper circuit 6 and the light-emitting chip 5 during operation to the heat sink.

[0033] Among them, Figure 6 , Fig.13 and Fig.14 As shown, the front side of the flexible substrate 1 and the inner wall of the bowl-shaped mounting groove 11 are both provided with a white oil layer formed by coating, the bowl-shaped mounting groove 11 is provided with a solid crystal glue 2 for protecting the light-emitting chip 5, and the top of the solid crystal glue 2 is provided with an optical glue layer 7; the white oil layer is coated on the front side of the flexible substrate 1 and the inner wall of the bowl-shaped mounting groove 11 before installing the light-emitting chip 5, and is used in conjunction with the bowl-shaped mounting groove 11 to reflect light, which belongs to the prior art and is therefore not marked in the accompanying drawings; after completing the connection between the copper circuit 6 and the light-emitting chip 5, the solid crystal glue 2 is injected into the bowl-shaped mounting groove 11, and the solid crystal glue 2 plays a role in protecting the light-emitting chip 5 after curing, and not only has good waterproof and moisture-proof effects, but also can effectively prevent the light-emitting chip 5 from being damaged due to extrusion.

[0034] Among them, Figure 1 , Figure 6 and Figure 7 As shown, the height of the inner side edge is higher than the flexible substrate 1, and the inner side edge cooperates with the flexible substrate 1 to form a receiving groove for receiving the optical adhesive layer 7, and the receiving groove is used to receive the optical adhesive layer 7. By intercepting the optical adhesive layer 7 by the inner side edge, the probability of liquid optical adhesive flowing onto the work surface during dispensing can be reduced.

[0035] During operation, when the flexible local dimming structure is attached to the curved display screen, the elastic contact member 36 is first deformed due to being squeezed, and the gas in the squeezed air cavity will flow into the cavity 33 through the air guide cavity 32, so that the flexible guide member 35 is tilted due to inflation to form an inclined surface with a guide function, and then the flexible local dimming structure will be attached to the curved display screen due to the optical adhesive layer 7. After the optical adhesive layer 7 is squeezed, the glue will flow outward and then flow into the round-shaped receiving groove 31 along the flexible guide member 35. The round-shaped receiving groove 31 can be used to accommodate the overflowed glue, which can effectively prevent the liquid optical glue from overflowing outside the surrounding edge 3.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible local dimming structure for a curved display screen, characterized in that: include: A flexible substrate (1), wherein the flexible substrate (1) is provided with a plurality of bowl-shaped mounting grooves (11) arranged in a matrix; A light-emitting chip (5) installed in the bowl-shaped installation groove (11); A copper circuit (6) arranged on a flexible substrate (1), wherein at least one positioning bracket for positioning a light-emitting chip (5) is provided on the copper circuit (6); A heat sink for dissipating heat from the light-emitting chip (5), the heat sink being embedded on the flexible substrate (1); A peripheral edge (3) is arranged outside the flexible substrate (1), the peripheral edge (3) is used to prevent glue from overflowing, the peripheral edge (3) is provided with a circular receiving groove (31) for receiving overflowing glue, the peripheral edge (3) is divided into an inner side edge that is in contact with the flexible substrate (1) and an outer side edge that is parallel to the inner side edge and has the same height as the inner side edge through the circular receiving groove (31), an elastic contact piece (36) with a C-shaped cross-section is provided at the top of the outer side edge, and a flexible flow guide piece (35) that is smoothly connected to the inner side edge is provided in the circular receiving groove (31).

2. The flexible local dimming structure of a curved display screen according to claim 1, characterized in that: The flexible flow guide (35) is provided with a cavity (33), and the surrounding edge (3) is provided with an air guide cavity (32) having a U-shaped cross-section, the air guide cavity (32) being connected to the cavity (33) via an arc-shaped air passage (34).

3. The flexible local dimming structure of a curved display screen according to claim 2, characterized in that: The elastic contact piece (36) is provided with an extrusion air cavity with a C-shaped cross-section, and the extrusion air cavity is connected to the air guide air cavity (32).

4. The flexible local dimming structure of a curved display screen according to claim 1, characterized in that: The heat sink comprises a heat sink frame (4) and a plurality of heat conductors (41) arranged in a matrix, the heat sink frame (4) is provided with heat sink strips arranged in a side-by-side manner, and the heat conductors (41) are distributed on the heat sink frame (4) and the heat sink strips.

5. The flexible local dimming structure of a curved display screen according to claim 4, characterized in that: The heat dissipation frame (4) and the heat dissipation strip are both arranged on the back side of the flexible substrate (1) and do not protrude from the flexible substrate (1); and a plurality of through holes (42) are provided on the heat dissipation frame (4) and the heat dissipation strip.

6. The flexible local dimming structure of a curved display screen according to claim 1, characterized in that: A conductive block (51) in contact with the copper circuit (6) is provided at the bottom of the light-emitting chip (5), and four insulating positioning blocks (52) distributed in a rectangular shape are provided outside the conductive block (51).

7. The flexible local dimming structure of a curved display screen according to claim 6, characterized in that: The positioning bracket comprises two middle protrusions (61) which are symmetrically distributed and fit with the conductive block (51); two auxiliary protrusions (63) which are symmetrically distributed and fit with the conductive block (51) are arranged outside the middle protrusion (61); and a positioning opening (62) which matches the insulating positioning block (52) is formed between the middle protrusion (61) and the auxiliary protrusion (63).

8. The flexible local dimming structure of a curved display screen according to claim 4, characterized in that: An insulator (12) is also provided in the bowl-shaped installation groove (11), and a through hole is provided on the insulator (12) through which the heat conductor (41) can pass.

9. The flexible local dimming structure of a curved display screen according to claim 1, characterized in that: The front surface of the flexible substrate (1) and the inner wall of the bowl-shaped mounting groove (11) are both provided with a white oil layer formed by coating, and a crystal-fixing glue (2) for protecting the light-emitting chip (5) is provided in the bowl-shaped mounting groove (11), and an optical glue layer (7) is provided on the top of the crystal-fixing glue (2).

10. The flexible local dimming structure of a curved display screen according to claim 1, characterized in that: The height of the inner side edge is higher than that of the flexible substrate (1), and the inner side edge cooperates with the flexible substrate (1) to form a receiving groove for receiving the optical adhesive layer (7).

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