CN210835532U

CN210835532U - Reflective display screen and reflective display device

Info

Publication number: CN210835532U
Application number: CN201922321219.2U
Authority: CN
Inventors: 赵雪梅; 占江徽; 李虎; 曾文宇; 郑彪; 张志�
Original assignee: BOE Technology Group Co Ltd; Hefei BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei BOE Optoelectronics Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-06-23
Anticipated expiration: 2029-12-20

Abstract

The present disclosure provides a reflective display screen and a reflective display device. This reflective display screen includes: a display panel; a front light source part located at a light emitting side of the display panel; the optical adhesive layer is positioned on one side of the front light source component, which is far away from the display panel; the cover plate is positioned on one side of the optical adhesive layer, which is far away from the display panel; and a light shielding member located on a side of the cover plate facing the display panel, and having an orthographic projection of at least a part of the light shielding member on the cover plate not overlapping with an orthographic projection of the display panel on the cover plate, wherein the light shielding member has a surface in direct contact with the cover plate. By means of the reflective display screen and the reflective display device, the pollution of the light-emitting surface of the front light source component by the light shielding component can be restrained, and the frame is favorably narrowed.

Description

Reflective display screen and reflective display device

Technical Field

The disclosure relates to the technical field of display, in particular to a reflective display screen and a reflective display device.

Background

Compared with the traditional backlight source product, the front light source is also called a reflection type light source, is a novel display device, and has the effects of energy conservation, environmental protection and eye protection because the front light source can utilize ambient light. The reflective light source product has wide prospect in the education market, is expected to replace the traditional textbook, not only greatly reduces the consumption of the traditional paper, saves forestry resources, but also relieves the waste paper recovery burden.

The display device using the front light may be a reflective display screen. Instead of disposing the light source on the side of the display device opposite to the light exit side as in conventional backlight products, the front light source may be located on the light exit side of the reflective display screen. The reflective display screen with the front light source needs to shield the side of the module.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a reflective display screen, including: a display panel; a front light source part located at a light emitting side of the display panel; the optical adhesive layer is positioned on one side of the front light source component, which is far away from the display panel; the cover plate is positioned on one side of the optical adhesive layer, which is far away from the display panel; and a light shielding member located on a side of the cover plate facing the display panel, and having an orthographic projection of at least a part of the light shielding member on the cover plate not overlapping with an orthographic projection of the display panel on the cover plate, wherein the light shielding member has a surface in direct contact with the cover plate.

In some embodiments, the surface of the optical adhesive layer facing the front light source component is all in direct contact with the front light source component.

In some embodiments, the light shielding member is not in contact with a surface of the front light source member on a side facing the cover plate.

In some embodiments, the shading member comprises a shading tape comprising: a first tape portion on a surface of the display panel on a side away from the cover plate; a second tape portion on an outer circumferential side surface of the display panel; and a third tape portion on a side of the cover plate facing the display panel.

In some embodiments, an orthographic projection of the third tape portion on the cover sheet does not overlap with an orthographic projection of the front light component on the cover sheet.

In some embodiments, the first, second, and third tape portions are integrally connected to one another.

In some embodiments, the thickness of the optical glue layer is less than or equal to 0.2 millimeters.

In some embodiments, the light shielding member includes a bubble gum on a surface of a side of the cover plate facing the display panel and in contact with an outer peripheral side surface of the display panel.

In some embodiments, an orthographic projection of the foam cotton on the cover plate does not overlap with an orthographic projection of the front light source component on the cover plate.

In some embodiments, the reflective display screen further comprises a support frame having: a first support frame portion located on a side of the display panel away from the cover plate, extending in a direction parallel to a surface of the display panel facing the side of the cover plate; and a second support frame portion located on a side of the cover plate facing the display panel, extending from the first support frame portion toward the cover plate in a direction perpendicular to a surface of the display panel facing the side of the cover plate, an additional light shielding portion being provided on a side of the second support frame portion facing the display panel.

In some embodiments, the additional light blocking portion comprises foam cotton.

In some embodiments, the light shielding member includes a hot melt adhesive, and the hot melt adhesive is located on a side of the cover plate facing the display panel and on an outer peripheral side of the display panel and the front light source unit.

In some embodiments, the cover plate comprises: cover plate glass; and the sensor layer is positioned on one side of the cover glass facing the display panel.

In some embodiments, an alignment mark is provided on a surface of the cover glass facing the display panel.

In some embodiments, the display panel includes: an array substrate; the color film substrate is positioned on one side of the array substrate, which faces the cover plate, and is positioned between the front light source component and the array substrate; and the light polarization sheet is positioned on one side of the color film substrate facing the cover plate and positioned between the front light source component and the color film substrate.

In some embodiments, the reflective display screen includes a display area and a peripheral area around the display area, an outer edge of the array substrate, an outer edge of the color filter substrate, an outer edge of the light polarizer, and an outer edge of the front light source device are all located outside a predetermined viewing angle range, a boundary of the predetermined viewing angle range is surrounded by an inclined surface extending to a side of the display panel away from the cover plate at an intersection of a boundary of the display area and a surface of the cover plate glass facing the display panel, and an orthographic projection of the inclined surface on the cover plate glass is located outside the display area.

In some embodiments, the inclined surface is at a 45 degree angle to a direction perpendicular to the cover glass.

In some embodiments, the color filter substrate is provided with a black matrix layer, the black matrix layer is provided with a light-transmitting hollow portion, and the hollow portion is located outside the predetermined visual angle range.

An embodiment of the present disclosure further provides a reflective display device, including the reflective display screen according to any of the above embodiments.

By means of the reflective display screen and the reflective display device, the pollution of the light-emitting surface of the front light source component by the light shielding component can be restrained, and the frame is favorably narrowed.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived by those skilled in the art without the benefit of inventive faculty, wherein:

fig. 1 schematically shows a schematic structure of an edge region of a reflective display screen.

Fig. 2 schematically shows a structural diagram of an edge region of a reflective display screen according to an embodiment of the present disclosure.

Fig. 3 schematically illustrates a structural schematic diagram of an edge region of another reflective display screen according to an embodiment of the present disclosure.

Fig. 4 schematically shows a structural diagram of an edge region of another reflective display screen according to an embodiment of the present disclosure.

Fig. 5 schematically shows a structural diagram of an edge region of a reflective display screen according to an embodiment of the present disclosure.

Fig. 6 schematically illustrates a structural view of an edge region of a further reflective display screen according to an embodiment of the present disclosure.

Fig. 7 schematically illustrates a structural schematic diagram of an edge region of another reflective display screen according to an embodiment of the present disclosure.

FIG. 8 schematically illustrates a top view of a reflective display screen according to an embodiment of the disclosure.

FIG. 9 schematically illustrates an exemplary block diagram of a reflective display screen employing a front light assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below in detail and completely with reference to the accompanying drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure. It should be noted that throughout the drawings, like elements are represented by like or similar reference numerals. In the following description, some specific embodiments are for illustrative purposes only and should not be construed as limiting the disclosure in any way, but merely as exemplifications of embodiments of the disclosure. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure. It should be noted that the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used in the embodiments of the present disclosure should be given their ordinary meanings as understood by those skilled in the art. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another.

Embodiments of the present disclosure are directed to reflective display screens employing front-facing light components. Fig. 9 shows an exemplary structure of the reflective display panel to briefly explain the principle of the reflective display panel. As shown in fig. 9, the reflective display screen 100 may include a display panel 10, a cover plate 20, and a front light assembly 30. The cover plate 20 is disposed on the light emitting side of the display panel 10, and the front light source unit 30 is disposed between the cover plate 20 and the display panel 10. The display panel 10 may include, for example, an array substrate 11, a color filter substrate 12, and a liquid crystal layer 13 located between the array substrate 11 and the color filter substrate 12. The array substrate 11 may include a first substrate 111 and a reflective layer 112 and an array structure 113 disposed on a side of the reflective layer 112 away from the first substrate 111. The array structure 113 may include functional structures such as a TFT (thin film transistor), a pixel electrode, a common electrode (in some examples, the reflective layer 112 may also be formed of the common electrode), and the like. The light emitted from the front light source unit 30 (and a part of the ambient light) enters the display panel 10, is reflected by the reflective layer 112, is modulated by the liquid crystal layer 13, and is emitted from the light emitting side of the display panel 10 to realize a display function. The color filter substrate 12 may include, for example, a color filter layer 121 and a second substrate 122. The color filter substrate 12 may further include a black matrix layer 123 for spacing the color filter layers 121 between different pixels to prevent light leakage. A light polarizer 14 may also be disposed on the side of the color filter substrate 12 away from the array substrate 11. The cover plate 20 may include a cover glass 21 and a sensor layer 22 on a side of the cover glass 21 facing the display panel 10. The sensor layer 22 may include, for example, sensor structures (e.g., touch electrodes, etc.) for performing touch detection and the like. After the front light assembly 30 is formed on the display panel 10, it may be adhered to the cover plate 20 by the optical adhesive layer 23. The front light source component 30 may be any front light source component or module known to those skilled in the art, and may include a light guide plate and light sources (such as LEDs, etc.) at two ends of the light guide plate, for example.

The present inventors have recognized that in the design of reflective displays, it is desirable to have a display with a narrow bezel as possible to improve the display ratio, while taking into account the lack of lines, light leakage, dark edges, and tolerance effects of various component materials. The front light source part is a light emitting part, and effective shielding measures need to be carried out on the side of the module so as to prevent light from being reflected by the outside part of the module to enter a visual line area to cause undesirable phenomena such as bright lines of pictures or uneven brightness and the like.

It should be noted that, since the embodiments of the present disclosure focus on shading the side of the reflective display screen and narrowing the bezel, in the following description, only the structure of the edge portion of the reflective display screen will be described, and the problems of how the reflective display screen specifically implements the display function and the like and the components not directly related to shading the side of the display screen will not be described in detail. The structure of the reflective display screen described above is merely exemplary, and embodiments of the present disclosure are not limited thereto, and reflective display screens having other structures may also be employed.

Fig. 1 shows a solution for shading the sides of a display screen with U-shaped adhesive tape. A view of an edge portion of a reflective display screen is shown in fig. 1. In fig. 1, the display panel 10 (shown including the array substrate 11, the color filter substrate 12, and the light polarizing plate 14) and the edge portion of the outer periphery side of the front light source unit 30 are covered with a light shielding tape 40. The light-shielding tape 40 has a U-shaped cross section. Specifically, the light shielding tape 40 can be seen to include three segments, a first segment 41 is disposed on a surface of the side of the display panel 10 away from the cover plate 20, a second segment 42 extends in a direction perpendicular to the surface of the display panel facing the side of the cover plate 20, and is disposed on a surface of an outer peripheral side of the display panel, and a third segment 43 is located on a surface of the front light source part 30 facing the cover plate 20. The three segments are connected together to cover the edge portions of the display panel 10 and the front light assembly 30. In this case, a side of the front light source unit 30 facing the cover plate 20 is covered with a portion of the light shielding tape 40. However, the surface on the side of the front light source part 30 facing the cover plate 20 and the surface on the side of the front light source part 30 facing the display panel 10 are generally light emitting surfaces (may also be referred to as light emitting surfaces) of the front light source part 30. When the light shielding tape 40 is attached to the surface of the front light source component 30 facing the cover plate 20, a jig is needed for positioning. In the process of attaching the light-shielding tape 40, the light-shielding tape 40 may contaminate the light-emitting surface of the front light source component 30, thereby affecting the yield of the product.

In addition, the overlapping width of the light shielding tape 40 and the surface of the front light source part 30 facing the side of the cover plate 20 is at least 0.8mm in consideration of process operation and reliability. The width of the frame of the display panel 10 under this structure is limited by a plurality of factors that affect the array substrate 11, the color filter substrate 12, the light polarizer 14, and the front light assembly 30: (1) the minimum distance between the edge of the light-shielding tape 40 and the display area at a line of sight offset of 45 ° (the reflective display screen has a display area AA and a peripheral area BB around the display area, and the boundary between the display area AA and the peripheral area BB is represented by a line BOR in fig. 1); (2) a minimum overlapping width of the light shielding tape 40 and a surface of the front light source part 30 on a side facing the cover plate 20; (3) the pasting tolerance of the shading tape 40; (4) the fit tolerance between the display panel and the cover plate; (5) tolerances in the distance from the edge of the front light source member 30 to the edge of the light polarizing plate 14 (including dimensional tolerances and overlay tolerances); (6) tolerance of the distance from the edge of the light polarizer 14 to the edge of the color filter substrate 12 (attachment tolerance of the light polarizer 14); (7) and the distance from the hollow part in the black matrix layer in the color film substrate to the edge of the display panel.

Furthermore, with the design of the U-shaped light-shielding tape 40, as can be clearly seen from fig. 1, the distance from the display area AA to the edge of the module (including the display panel 10 and the light-shielding tape 40) is greater than the distance from the display area AA to the edge of the display panel by one layer of the thickness of the light-shielding tape.

As can be seen from the above, the overlapping width of the light-shielding tape 40 and the surface of the front light source part 30 on the side facing the cover plate 20 is disadvantageous for obtaining a narrow bezel of the display panel.

Fig. 2 schematically shows a schematic structural diagram of an edge region of a reflective display screen 200 according to an embodiment of the present disclosure. The reflective display screen 200 may include a display panel 10; a front light source unit 30 positioned on the light emitting side of the display panel 10; an optical adhesive layer 23 located on a side of the front light source component 30 away from the display panel 10; the cover plate 20 is positioned on one side of the optical adhesive layer 23 far away from the display panel 10; and a light shielding member located on a side of the cover plate 20 facing the display panel 10, wherein an orthographic projection of at least a part of the light shielding member on the cover plate 20 does not overlap with an orthographic projection of the display panel 10 on the cover plate 20.

In the example of fig. 2, the light shielding member is a light shielding tape 50. The light-shielding tape 50 includes a first tape portion 51, a second tape portion 52, and a third tape portion 53. The first tape portion 51 is located on a surface of the display panel 10 on a side away from the cover plate 20, the second tape portion 52 is located on the outer peripheral side surface 16 of the display panel 10, and the third tape portion 53 is located on a side of the cover plate 20 facing the display panel 10. The orthographic projection of the third adhesive tape portion 53 on the cover plate 20 does not overlap with the orthographic projection of the display panel 10 on the cover plate 20, or the orthographic projection of the third adhesive tape portion 53 on the cover plate 20 is located outside the orthographic projection of the display panel 10 on the cover plate 20. The third tape portion 53 of the light shielding tape 50 has a surface 54 (an upper surface of the third tape portion 53 in the drawing) which is in direct contact with the cover sheet 20. By comparing the example of fig. 2 with the example of fig. 1, it can be seen that the light shielding tape 50 has a Z-shaped cross-sectional shape, instead of having a U-shaped cross-sectional shape like the light shielding tape 40 shown in fig. 1. Therefore, we can refer to the light-shielding tape 50 of such a shape as shown in the example of fig. 2 as a Z-shaped light-shielding tape.

The design of the Z-shaped light-shielding tape prevents the light-shielding tape 50 from contacting the light-emitting surface of the front light source component 30, and prevents the yield from decreasing due to the light-shielding tape contaminating the light-emitting surface of the front light source component 30.

As can be seen from fig. 2, in the above design of the Z-shaped light-shielding tape, the surface (light-emitting surface) of the front light source component 30 facing the side of the cover plate 20 is in direct contact with the optical adhesive layer 23, and the light-shielding tape is no longer disposed between the front light source component 30 and the optical adhesive layer 23.

In addition, for the design of the Z-shaped light-shielding tape, the width of the frame of the display panel 10 is limited by a plurality of influencing factors related to the array substrate 11, the color filter substrate 12, the light polarizer 14 and the front light source component 30: (1) the minimum value of the distance between the edge of the light-shielding tape 50 and the display area AA at the line of sight offset of 45 ° (the reflective display screen has the display area AA and a peripheral area BB around the display area, and the boundary between the display area AA and the peripheral area BB is represented by a line BOR in fig. 2); (2) the fit tolerance between the display panel and the cover plate; (3) offset tolerance between the front optical member 30 and the display panel 10; (4) dimensional tolerance of the front light source member 30; (5) tolerances in the distance from the edge of the front light source member 30 to the edge of the light polarizing plate 14 (including dimensional tolerances and overlay tolerances); (6) tolerance of the distance from the edge of the light polarizer 14 to the edge of the color filter substrate 12 (attachment tolerance of the light polarizer 14); (7) and the distance from the hollow part in the black matrix layer in the color film substrate to the edge of the display panel.

From the above analysis, it can be seen that, with the design of the Z-shaped light-shielding tape, the width of the frame of the display panel 10 is no longer limited by the overlapping width of the light-shielding tape and the front light source component 30 and the pasting tolerance of the light-shielding tape. As described above, in the case of the U-shaped light shielding tape, the overlapping width of the light shielding tape 40 and the front light source part 30 is at least 0.8mm, which has a relatively large influence on the narrowing of the width of the frame of the display panel 10. Therefore, the design of the Z-shaped light shielding tape is more advantageous for obtaining a narrower bezel of the display panel.

In addition, as can be seen from fig. 1, since the light shielding tape 40 is located between the front light source part 30 and the optical adhesive layer 23, the optical adhesive layer 23 needs to have a larger thickness in order to compensate for a step difference between the light shielding tape 40 and the front light source part 30. In contrast, in the Z-shaped light-shielding tape design shown in fig. 2, there is no such step difference between the light-shielding tape 50 and the front light source component 30, and therefore, the thickness of the optical adhesive layer 23 may be smaller, for example, the thickness of the optical adhesive layer 23 may be reduced by one value (for example, 0.05mm) of the thickness of the light-shielding tape, as compared with the U-shaped light-shielding tape design shown in fig. 1.

To sum up, in the example of using the U-shaped light-shielding tape as shown in fig. 1, on one hand, the tape needs to be positioned by a jig (jig) when being coated, and the light-emitting surface of the front light source component is easily contaminated; on the other hand, the light-shielding tape provided on the front light source member affects the layout of the optical adhesive layer 23, and if the optical adhesive layer 23 is too thin to be equal to or less than the thickness of the light-shielding tape, bubbles may be generated at a step difference between the optical adhesive layer 23 and the light-shielding tape. However, it is often undesirable to make the optical glue layer 23 too thick due to the thinness of the device. In addition, since the light shielding tape 40 must have a certain overlapping width with the front light source part to implement the application of the light shielding tape 40, the end of the third section 43 of the light shielding tape 40 contacting the surface of the front light source part 30 is closer to the display region than the outer edge of the display panel 10, and thus, the width of the bezel is restricted by the end of the third section 43 of the light shielding tape 40, so that the bezel width is wide.

However, the light-shielding tape 50 is not in contact with the surface of the front light source component, so that the light-emitting surface of the front light source component can be prevented from being contaminated, and the optical adhesive layer 23 is not limited by the thickness of the light-shielding tape, and can be made thinner, for example, smaller than 0.2mm or smaller than or equal to the thickness of the light-shielding tape. Furthermore, since the light-shielding tape 50 does not contact the surface of the front light source component, the orthographic projection of the third tape portion 53 on the cover plate 20 is located outside the orthographic projection of the display panel 10 on the cover plate 20, and therefore, the width of the bezel is directly limited to the edge of the display panel 10, which is beneficial to reducing the width of the bezel.

In some embodiments, the orthographic projection of the third adhesive tape portion 53 on the cover plate 20 does not overlap with the orthographic projection of the front light source component 30 on the cover plate 20, so as to ensure that the third adhesive tape portion 53 does not interfere with the light emitting surface of the front light source component 30. In some embodiments, the first, second, and third

adhesive tape portions

51, 52, 53 are integrally connected to one another. That is, the light-shielding tape 50 may use a complete tape, which is advantageous for securing the fastness of the light-shielding tape.

In the embodiment of the present disclosure, the light shielding tape 50 may be made of metal such as aluminum. The light shielding tape 50 may also function to electromagnetically shield and protect the display panel and the front light source part 30, in addition to the light shielding function.

In some embodiments, an alignment mark 55 may be provided on a surface of the cover glass 21 facing the display panel 10. The alignment mark 55 is used to provide a reference for application of the light shielding tape 50 (particularly the third tape portion 53). An example of an alignment mark 55 is shown on fig. 7, for example, the alignment mark 55 may be formed between the cover glass 21 and the sensor layer 22 (in a direction perpendicular to the cover glass 21). However, the embodiments of the present disclosure are not limited thereto, and for example, the alignment mark 55 may also be formed in a stacked structure of the sensor layer 22 (the sensor layer 22 described in the present disclosure may include a plurality of layers (e.g., a plurality of touch electrode layers, an insulating layer, etc.)). In some embodiments, alignment marks 55 may be ink-printed marking lines.

Another exemplary block diagram of a design employing Z-shaped masking tape is shown in fig. 5. In the example of fig. 5, a support frame 60 (which may also be referred to as a mid-frame) is shown. The support frame 60 may include a first support frame portion 61 and a second support frame portion 62. The first supporting frame portion 61 is located on a side of the display panel 10 away from the cover plate 20, and extends along a direction parallel to a surface (e.g., a light emitting surface) of the display panel 10 facing the side of the cover plate 20. The second support frame part 62 is located on a side of the cover plate 20 facing the display panel 10, and extends from the first support frame part 61 toward the cover plate 20 in a direction perpendicular to a surface of the display panel 10 facing the side of the cover plate 20. The second support frame part 62 can be connected to the cover plate 20 by means of a sealing compound 63 on the side facing away from the first support frame part 61, so as to support the cover plate 20. In some embodiments, a gap may be provided between the first support frame portion 61 and the surface of the display panel 10 on the side away from the cover plate 20 to avoid generating unnecessary interference.

Fig. 3 shows a schematic structural diagram of an edge region of another reflective display screen 300 according to an embodiment of the present disclosure. In this example shown in fig. 3, a foam adhesive 70 is employed as a light shielding member instead of the light shielding tape. The foam adhesive 70 is located on a surface of the cover plate 20 facing a side of the display panel 10 and contacts the outer circumferential side surface 16 of the display panel 10. In the example shown in fig. 3, the foam 70 may be, for example, black, and may be, for example, 1mm wide (in fig. 3). The foam 70 has a surface 54' (shown as the upper surface of the foam 70) in direct contact with the cover 20. In some embodiments, the foam rubber 70 may not completely cover the peripheral side surface 16 of the display panel 10, for example, only contact with the peripheral side surface of the color filter substrate 12, and not contact with the peripheral side surface of the array substrate 11. This does not affect the distance between the edge of the display panel 10 and the display area AA, but requires enough space in the reflective display screen to apply the foam 70. This embodiment can also avoid the limitation of the bezel due to the overlapping width of the light-shielding tape 40 and the front light source component 30, which is beneficial to narrowing the bezel.

In some embodiments, the orthographic projection of the foam 70 on the cover plate 20 and the orthographic projection of the front light source component 30 on the cover plate 20 may not overlap, so as to avoid interference of the foam 70 on the front light source component 30.

In some embodiments, for the solution of using the foam rubber 70 as the light shielding member, an alignment mark 55 may also be provided on the surface of the cover glass 21 facing the display panel 10. The alignment mark 55 is used to provide a reference for the application of the foam 70. An example of an alignment mark 55 is shown on fig. 7, for example, the alignment mark 55 may be formed between the cover glass 21 and the sensor layer 22 (in a direction perpendicular to the cover glass 21). However, the embodiments of the present disclosure are not limited thereto, and for example, the alignment mark 55 may also be formed in a stacked structure of the sensor layer 22 (the sensor layer 22 described in the present disclosure may include a plurality of layers (e.g., a plurality of touch electrode layers, an insulating layer, etc.)). In some embodiments, alignment marks 55 may be ink-printed marking lines.

In some embodiments, for implementations that employ foam 70 as a light blocking member, reflective display screen 300 may also include a support frame 60 (also referred to as a bezel). The support frame 60 may include a first support frame portion 61 and a second support frame portion 62. The first support frame portion 61 is located on a side of the display panel 10 away from the cover plate 20, and extends in a direction parallel to the display panel 10. The second support frame portion 62 is located on a side of the cover plate 20 facing the display panel 10, and extends from the first support frame portion 61 toward the cover plate 20 in a direction perpendicular to the display panel 10. The second support frame part 62 can be connected to the cover plate 20 by means of a sealing compound 63 on the side facing away from the first support frame part 61, so as to support the cover plate 20. An additional light shielding portion 71 is provided on a side of the second support frame portion 62 facing the display panel 10, as shown in fig. 3. The additional shading portion 71 may also comprise or be made of foam rubber, which may cooperate with the foam rubber 70 to achieve a better shading effect. For example, in a direction (y direction in fig. 3) directed from the cover plate 20 toward the display panel 10, the light shielding portion 71 may extend beyond the foam 70, which allows the size of the foam 70 in the y direction to be reduced appropriately. The light shielding portion 71 is farther from the outer peripheral side surface 16 of the display panel 10 than the foam 70. In some embodiments, a gap may be provided between the first support frame portion 61 and the surface of the display panel 10 on the side away from the cover plate 20 to avoid generating unnecessary interference.

Fig. 4 shows a schematic structural diagram of an edge region of yet another reflective display screen 400 according to an embodiment of the present disclosure. In the example shown in fig. 4, a hot melt adhesive 80 is used as a light shielding member, and the hot melt adhesive 80 is located on the side of the cover plate 20 facing the display panel 10 and on the outer peripheral side of the display panel 10 and the front light source section 30. The hot melt adhesive 80 may be applied by a dedicated adhesive spraying apparatus, for example, 2 to 3 turns (the application thickness of each turn is, for example, about 0.2mm) around the display panel 10 and the front light source section 30. The hot melt adhesive 80 may contact a surface (lower surface in the drawing) of the cover plate 20 facing the display panel 10, and may also serve to shield the display panel 10 and components such as the front light source unit 30 from light. The hot melt adhesive 80 has a surface 54 "(the upper surface in the drawing) that is in direct contact with the cover plate 20. The solution of using the hot melt adhesive 80 can also avoid the limitation of the overlapping width of the light-shielding tape 40 and the front light source component 30 on the frame, which is beneficial to narrowing the frame. It does not scratch the light exit surface of the front light source unit 30. In some embodiments, the hot melt adhesive 80 may be filled in gaps between edge portions of each of the front light source part 30, the light polarizing plate 14, the color filter substrate 12, and the array substrate 11 and a surface of the cover plate 20 facing the display panel 10. In some embodiments, the orthographic projection of the hot melt adhesive 80 on the cover plate 20 may at least partially overlap with the orthographic projection of the edge portion of each of the front light source component 30, the light polarizer 14, the color filter substrate 12 and the array substrate 11 on the cover plate 20.

In some embodiments, a light shielding member (e.g., a light shielding tape 50, a foam adhesive 70, or a hot melt adhesive 80) in the reflective display screen may not contact with a surface of the side of the front light source assembly 30 facing the cover plate 20, so as to prevent scratching or contamination of the light emitting surface of the front light source assembly 30.

Since the liquid crystal layer and the like are not generally located at the edge of the display panel 10, it is not related to the light shielding and frame width design of the display panel 10 and the front light source unit 30. In the examples of fig. 1 to 5, the array substrate 11, the color filter substrate 12, and the light polarizer 14 included in the display panel 10 are mainly shown in the display panel 10, and other structures are omitted. The color filter substrate 12 is located on one side of the array substrate 11 facing the cover plate 20 and located between the front light source assembly 30 and the array substrate 11, and the light polarizer 14 is located on one side of the color filter substrate 12 facing the cover plate 20 and located between the front light source assembly 30 and the color filter substrate 12.

In some embodiments, the reflective display 200 includes a display area AA and a peripheral area BB located around the display area AA, as shown in fig. 8. For a reflective display screen employing the front light source assembly 30, it is desirable that the outer edge 110 of the array substrate 11, the outer edge 120 of the color filter substrate 12, the outer edge 140 of the light polarizer 14, and the outer edge 310 of the front light source assembly 30 are all located outside a predetermined viewing angle range. The boundary BV (indicated by a dot-and-dash line in fig. 2) of the predetermined viewing angle range is an inclined plane (a diagonal line in fig. 2) extending from the intersection (point P in fig. 2) of the boundary BOR of the display area AA and the surface of the cover glass 21 facing the display panel 10 to the side of the display panel away from the cover glass 20, and the predetermined viewing angle range is surrounded by the boundary BV, and the orthographic projection of the inclined plane on the cover glass 21 is located outside the display area AA. The outer edge 110 of the array substrate 11, the outer edge 120 of the color filter substrate 12, the outer edge 140 of the light polarizer 14, and the outer edge 310 of the front light source device 30 are all located outside the predetermined viewing angle range, which can prevent the outer edges from causing undesirable brightness and darkness changes in the viewing field, which is advantageous for improving the display effect of the reflective display screen.

The above conditions are effective to limit the width of the frame, and it is necessary that the width of the frame of the display panel is equal to or greater than a certain value so that the outer edge 120 of the color filter substrate 12, the outer edge 140 of the light polarizer 14, and the outer edge 310 of the front light source device 30 are located outside the boundary BV of the predetermined viewing angle range. As can be seen from fig. 2, when the thickness of the optical adhesive layer 23 is increased, the outer edge 110 of the array substrate 11, the outer edge 120 of the color filter substrate 12, the outer edge 140 of the light polarizer 14, and the outer edge 310 of the front light source device 30 are closer to the boundary BV of the predetermined viewing angle range, and the limitation on the width narrowing of the bezel is also increased. This means that a smaller thickness of the optical glue layer 23 is also advantageous for reducing the width of the bezel.

In some embodiments, the inclined surface may form an angle θ of 45 degrees with respect to a direction perpendicular to the cover glass 21. However, embodiments of the present disclosure are not limited thereto, and for example, the inclined surface may also be at other angles to the direction perpendicular to the cover glass 21 to change the above-mentioned predetermined viewing angle range, if necessary.

Fig. 6 schematically illustrates a structural diagram of an edge region of yet another reflective display screen 500 according to an embodiment of the present disclosure. Compared with fig. 2, the embodiment shown in fig. 6 is different in that a black matrix layer 123 is disposed on the color filter substrate 12, the black matrix layer 123 has a light-transmitting hollow portion 124 therein, and the hollow portion 124 may also be located outside the predetermined viewing angle range. In the non-display area, some hollow portions 124 are also required to be provided in the black matrix layer 123. If these cutouts 124 fall within the predetermined viewing angle range, they may cause a sudden change in local brightness in the field of view. In order to prevent the hollow portions 124 from affecting the field of view of the reflective display screen, it is desirable to set the hollow portions 124 outside the predetermined range of viewing angles. The predetermined viewing angle range can be set according to actual needs.

In each of the above-described embodiments shown in fig. 2 to 7, the light shielding member has a surface directly contacting the cover sheet 20, such as the surface 54 of the light shielding tape 50 directly contacting the cover sheet 20, the surface 54 of the foam adhesive 70 directly contacting the cover sheet 20, and the surface 54 ″ of the hot melt adhesive 80 directly contacting the cover sheet 20. This may facilitate retention and positioning of the shutter member by the cover plate 20 without the shutter member having to be secured by the optical glue layer 23 as shown in FIG. 1. This provides convenience in avoiding direct contact between the light shielding member and the optical adhesive layer 23 and the light exit surface of the front light source member 30.

In the embodiment of the present disclosure, the surface of the optical adhesive layer 23 facing the front light source part 30 may be all in direct contact with the front light source part 30. In this way, no component such as the light-shielding tape 40 is disposed between the optical adhesive layer 23 and the front light source component 30, so that the light-emitting surface of the front light source component 30 can be prevented from being contaminated by the components, and the thickness of the optical adhesive layer 23 can be reduced appropriately. In addition, the area of the surface of the optical adhesive layer 23 facing the front light source part 30 may be smaller than the area of the surface of the front light source part 30 in direct contact therewith, which may prevent the optical adhesive layer 23 from overflowing out of the front light source part 30 to avoid the optical adhesive layer 23 from contacting contaminants or bubbles, etc.

The embodiment of the present disclosure further provides a reflective display device, which includes the reflective display screen according to any one of the above embodiments. The reflective display device can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The reflective display device can be implemented with reference to the above embodiments of the reflective display screen, and repeated descriptions are omitted.

Unless there is a technical obstacle or contradiction, the above-described various embodiments of the present invention may be freely combined to form further embodiments, which are all within the scope of the present invention.

Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify preferred embodiments of the present invention, and should not be construed as limiting the present invention.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A reflective display screen, comprising:

a display panel;

a front light source part located at a light emitting side of the display panel;

the optical adhesive layer is positioned on one side of the front light source component, which is far away from the display panel;

the cover plate is positioned on one side of the optical adhesive layer, which is far away from the display panel; and

a light shielding member located on a side of the cover plate facing the display panel, and having an orthographic projection of at least a portion of the light shielding member on the cover plate not overlapping with an orthographic projection of the display panel on the cover plate,

wherein the light shielding member has a surface directly contacting the cover plate.

2. The reflective display screen of claim 1, wherein the surface of the optical glue layer facing the front light component is all in direct contact with the front light component.

3. A reflective display according to claim 2 wherein the light blocking member is not in contact with a surface of the front light source member on a side facing the cover plate.

4. The reflective display screen of claim 3, wherein the light blocking member comprises a light blocking tape comprising:

a first tape portion on a surface of the display panel on a side away from the cover plate;

a second tape portion on an outer circumferential side surface of the display panel; and

a third tape portion on a side of the cover plate facing the display panel.

5. The reflective display screen of claim 4, wherein an orthographic projection of the third tape portion on the cover sheet does not overlap an orthographic projection of the front light component on the cover sheet.

6. The reflective display screen of claim 4, wherein the first, second, and third tape portions are integrally connected to one another.

7. The reflective display screen of any one of claims 1-6, wherein the thickness of the layer of optical glue is less than or equal to 0.2 millimeters.

8. A reflective display according to claim 3 wherein the light blocking member comprises foam located on a surface of the cover plate on a side facing the display panel and in contact with a peripheral side surface of the display panel.

9. The reflective display screen of claim 8, wherein an orthographic projection of the foam on the cover sheet does not overlap an orthographic projection of the front light assembly on the cover sheet.

10. A reflective display screen in accordance with claim 9, wherein: still include the carriage, the carriage has:

a first support frame portion located on a side of the display panel away from the cover plate, extending in a direction parallel to a surface of the display panel facing the side of the cover plate; and

a second support frame portion located on a side of the cover plate facing the display panel, extending from the first support frame portion toward the cover plate in a direction perpendicular to a surface of the display panel facing the side of the cover plate, an additional light shielding portion being provided on a side of the second support frame portion facing the display panel.

11. A reflective display screen according to claim 10 wherein the additional light blocking portions comprise foam.

12. A reflective display screen according to claim 2, wherein the light blocking member comprises a hot melt adhesive on a side of the cover sheet facing the display panel and on an outer peripheral side of the display panel and the front light source section.

13. The reflective display screen of any one of claims 1-6 and 8-12, wherein the cover plate comprises:

cover plate glass; and

a sensor layer on a side of the cover glass facing the display panel.

14. The reflective display screen of claim 13, wherein alignment marks are provided on a surface of the cover glass facing the display panel.

15. The reflective display screen of claim 13, wherein the display panel comprises:

an array substrate;

the color film substrate is positioned on one side of the array substrate, which faces the cover plate, and is positioned between the front light source component and the array substrate; and

and the light polarization sheet is positioned on one side of the color film substrate, which faces the cover plate, and is positioned between the front light source component and the color film substrate.

16. The reflective display screen according to claim 15, wherein the reflective display screen comprises a display area and a peripheral area around the display area, the outer edge of the array substrate, the outer edge of the color filter substrate, the outer edge of the light polarizer and the outer edge of the front light source device are all located outside a predetermined viewing angle range, the boundary of the predetermined viewing angle range is defined by an inclined surface extending from the intersection of the boundary of the display area and the surface of the cover glass facing the display panel to the side of the display panel away from the cover plate, and the orthographic projection of the inclined surface on the cover glass is located outside the display area.

17. The reflective display screen of claim 16, wherein the tilted surface is at a 45 degree angle from perpendicular to the cover glass.

18. The reflective display screen of claim 16, wherein the color filter substrate is provided with a black matrix layer, the black matrix layer has a light-transmissive hollow portion therein, and the hollow portion is located outside the predetermined viewing angle range.

19. A reflective display device comprising a reflective display screen according to any one of claims 1 to 18.