CN106200196A - Front light display device and manufacturing method thereof - Google Patents

Abstract

The invention discloses a front light display device and a manufacturing method thereof. The front light display device comprises a reflective display module, a light guide plate, optical cement, a plurality of microstructures and a light source. The light guide plate is provided with a first surface, a second surface and a third surface, wherein the first surface and the second surface are opposite, and the third surface is adjacent to the first surface and the second surface. The light guide plate is made of glass. The optical cement is positioned between the reflective display module and the first surface of the light guide plate. The microstructures are located on the first surface of the light guide plate. The light source faces the third surface of the light guide plate. The glass light guide plate has waterproof capability, not only has light guide function, but also can be used as a packaging element of a front light display device. Compared with the prior front light display device, the optical contrast table of the invention is improved.

Description

Front light display device and manufacturing method thereof

technical field

The invention relates to a front light display device and a manufacturing method of the front light display device.

Background technique

In the existing electrophoretic display with front lighting, the substrate, electrodes, microcapsule (microcapsule) layer, electrodes, transparent substrate, optical clear adhesive (OCA), protection sheet (protection sheet) are stacked from bottom to top. ), optical glue, light guide plate (LGP), optical glue, anti-glare film (anti-glare film; AG film), and waterproof glue around the substrate, electrode, microcapsule layer, electrode, transparent substrate, optical Glue and the side of the protective sheet to prevent water vapor from penetrating into the electrophoretic display and prolong the service life of the electrophoretic display.

From the above elements of the conventional electrophoretic display, it can be seen that in addition to the bottom substrate, there is also a transparent substrate and a protective sheet, and the electrophoretic display has three layers of optical glue. After the light enters the light guide plate from the light source, the light will pass through the optical glue, the protective sheet, the optical glue, the transparent substrate, the electrode and the microcapsule layer in sequence. As the light travels, it passes through layers of material. The refractive index of each layer material is not the same, so light will be reflected at the interface between the layers, making it difficult to improve the optical contrast performance of the existing electrophoretic display.

Due to the large number of components in the existing electrophoretic display, the number of interfaces between layers in the electrophoretic display is also large, which not only affects the optical contrast performance, but also makes it difficult to reduce the thickness of the entire electrophoretic display.

Contents of the invention

An object of the present invention is to provide a front light display device, which can improve the optical contrast performance of the existing front light display device.

According to an embodiment of the present invention, a front light display device is provided, which includes a reflective display module, a light guide plate, optical glue, a plurality of microstructures and a light source. The light guide plate has a first surface and a second surface opposite to each other, and a third surface adjacent to the first surface and the second surface. The material of the light guide plate includes glass. The optical glue is located between the reflective display module and the first surface of the light guide plate. The microstructures are located on the first surface of the light guide plate. The light source faces the third surface of the light guide plate.

Preferably, in the above technical solution, the front light display device further includes: a touch sensing layer located on the second surface of the light guide plate.

Preferably, in the above technical solution, the front light display device further includes: a transparent low-refractive index layer located between the touch-sensitive layer and the light guide plate, or located on the surface of the touch-sensitive layer facing away from the light guide plate.

Preferably, in the above technical solution, the refractive index of the transparent low-refractive index layer is smaller than that of the light guide plate, and the refractive index of the transparent low-refractive index layer is between 1.3-1.45.

Preferably, in the above technical solution, the transparent low-refractive index layer is located between the touch-sensitive layer and the light guide plate, and the front light display device further includes: a surface treatment layer, which is located on the surface of the touch-sensitive layer facing away from the transparent low-refractive index layer superior.

Preferably, in the above technical solution, the surface treatment layer is a hard coat layer, an anti-glare layer or an anti-reflection layer.

Preferably, in the above technical solution, the transparent low refractive index layer is located on the surface of the touch sensing layer facing away from the light guide plate, and the front light display device further includes: a surface treatment layer located on the surface of the transparent low refractive index layer facing away from the touch sensing layer on the surface.

Preferably, in the above technical solution, the front light display device further includes: a surface treatment layer located on the surface of the touch sensing layer facing away from the light guide plate.

Preferably, in the above technical solution, the front light display device further includes: a touch sensing layer located between the plurality of microstructures and the first surface of the light guide plate.

Preferably, in the above technical solution, the front light display device further includes: a surface treatment layer located on the second surface of the light guide plate.

Preferably, in the above technical solution, the thickness of the optical glue is greater than the height of each microstructure.

Preferably, in the above technical solution, the thickness of the optical glue is h, the height of each microstructure is d, and h>5d.

Preferably, in the above technical solution, the material of the plurality of microstructures includes UV-curable glue.

Preferably, in the above technical solution, the size of the light guide plate is larger than that of the reflective display module, so that the side of the light guide plate having the third surface protrudes from the reflective display module.

Preferably, in the above technical solution, the light guide plate has a fourth surface opposite to the third surface, and the fourth surface is coplanar with one side of the reflective display module.

Preferably, in the above technical solution, the front light display device further includes: waterproof glue surrounding the reflective display module and the optical glue, and the waterproof glue extends at least partially to the fourth surface of the light guide plate.

Another object of the present invention is to provide a method for manufacturing a front light display device.

According to an embodiment of the present invention, a method for manufacturing a front light display device is provided, which includes the following steps. A plurality of microstructures are formed on the first surface of the light guide plate, wherein the material of the light guide plate includes glass. The first surface of the light guide plate is pasted on the reflective display module by using optical glue.

Preferably, in the above technical solution, the step of forming a plurality of microstructures on the first surface of the light guide plate includes: coating the first surface of the light guide plate with ultraviolet curable glue; processing or pressing to shape the UV-curable adhesive; and irradiating the UV-curable adhesive with ultraviolet light to cure the UV-curable adhesive to form multiple microstructures.

Preferably, in the above technical solution, the manufacturing method of the front light display device further includes: forming a touch sensing layer on the second surface of the light guide plate; A transparent low-refractive index layer is formed on the surface of the light guide plate.

In the above embodiments of the present invention, the light guide plate made of glass is waterproof, not only has a light guide function, but also can be used as a packaging component of the front light display device. Therefore, the front light display device of the present invention can omit the transparent substrate, protective sheet and two layers of optical glue of the conventional electrophoretic display, so that the number of interfaces between layers can be reduced. In this way, the reflection of light at the interface between the layers is also reduced, thereby improving the optical contrast performance of the front light display device. In addition, since the number of components of the front light display device is small, the thickness of the front light display device can be reduced, which is helpful for thinner design. The light guide plate made of glass in the embodiment of the present invention can be surface-treated to selectively form microstructures, touch-sensitive layers, transparent low-refractive index layers, and surface treatment layers on the surface, so that the function or optical properties of the front light display device can be improved. Quality is improved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a cross-sectional view of a front light display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a front light display device according to another embodiment of the present invention.

FIG. 3 is a flow chart of a manufacturing method of a front light display device according to an embodiment of the present invention.

4 is a cross-sectional view of a front light display device according to still another embodiment of the present invention.

5 is a cross-sectional view of a front light display device according to still another embodiment of the present invention.

detailed description

FIG. 1 is a cross-sectional view of a front light display device 100 according to an embodiment of the present invention. As shown in the figure, the front light display device 100 includes a reflective display module 110 , a light guide plate 120 , an optical glue 130 , a plurality of microstructures 140 and a light source 150 . Wherein, the light guide plate 120 has a first surface 122 , a second surface 124 opposite to each other, and a third surface 126 adjacent to the first surface 122 and the second surface 124 . The material of the light guide plate 120 includes glass. The optical adhesive 130 is located between the reflective display module 110 and the first surface 122 of the light guide plate 120 . The microstructure 140 is located on the first surface 122 of the light guide plate 120 . The light source 150 faces the third surface 126 of the light guide plate 120 . The light source 150 may be a light emitting diode (light emitting diode; LED), but is not limited thereto. When the light source 150 emits light, light L1 enters the light guide plate 120 from the third surface 126 . The light L1 can pass through the light guide plate 120 and exit from the first surface 122 of the light guide plate 120 . Then, the light L1 can be refracted to the reflective display module 110 through the microstructure 140 , so that the reflective display module 110 can display images.

In this embodiment, the reflective display module 110 may be an electrophoretic display module, which includes a substrate 112 , an electronic ink layer 114 , a pixel electrode layer 116 and a common electrode layer 118 . The pixel electrode layer 116 is located between the substrate 112 and the electronic ink layer 114 , and the common electrode layer 118 is located between the optical glue 130 and the electronic ink layer 114 . The electronic ink layer 114 is used to reflect the light emitted from the first surface 122 of the light guide plate 120 , so that the light is reflected to the outside of the front light display device 100 for viewing by the user.

Since the light guide plate 120 made of glass is waterproof, the light guide plate 120 of the embodiment of the present invention not only has a light guide function, but also can be used as a packaging component of the front light display device 100 to protect the reflective display module 110 . Compared with the prior art, the front light display device 100 of the embodiment of the present invention can omit the transparent substrate, protective sheet and two layers of optical glue of the existing electrophoretic display, so that the number of interfaces between layers can be reduced. In this way, the reflection of light at the interface between layers is also reduced, thereby improving the optical contrast performance of the front light display device 100 . For example, the light L1 in FIG. 1 will only form reflected light R1 and R2 at the interface between the light guide plate 120 and the optical adhesive 130 and the interface between the optical adhesive 130 and the common electrode layer 118 , thus effectively reducing visual interference. In addition, the number of elements of the front light display device 100 of the embodiment of the present invention is small, so the thickness of the front light display device 100 can be reduced, which is helpful for thinner design.

On the other hand, the light guide plate 120 made of glass can also be surface-treated to selectively form a microstructure 140, a touch-sensitive layer 160, a transparent low-refractive index layer 170, and a surface treatment layer 180 on its surface, so that the front light display device 100's in functional or optical quality. In the following description, the structures and functions of the above layers will be further described.

In one embodiment, the thickness of the optical adhesive 130 is greater than the height of each microstructure 140 . In this embodiment, the thickness of the optical adhesive 130 is h, the height of each microstructure 140 is d, and h>5d. With such a design, when the light guide plate 120 is attached to the reflective display module 110 with the optical glue 130 , the optical glue 130 can fill the gap between the microstructure 140 and the first surface 122 of the light guide plate 120 to avoid air bubbles. In addition, the material of the microstructure 140 includes ultraviolet curable glue. When fabricating the microstructure 140 , the UV-curable glue can be coated on the first surface 122 of the light guide plate 120 first, then formed by pressing or rolling process, and cured by irradiating ultraviolet light. The microstructure 140 can effectively scatter the light L1 from the first surface 122 of the light guide plate 120 to the electronic ink layer 114 of the reflective display module 110 , which can improve the brightness and uniformity of the front light display device 100 .

In addition, the front light display device 100 further includes a touch sensing layer 160 , a transparent low-refractive index layer 170 and a surface treatment layer 180 located on the second surface 124 of the light guide plate 120 . The transparent low refractive index layer 170 is located between the touch sensing layer 160 and the light guide plate 120 , and the refractive index of the transparent low refractive index layer 170 is smaller than that of the light guide plate 120 . The refractive index of the touch sensing layer 160 is about 1.6, the refractive index of the glass light guide plate 120 is about 1.52, and the refractive index of the transparent low refractive index layer 170 can be between 1.3˜1.45. In this way, the transparent low-refractive index layer 170 can reflect the light L1 of the light source 150, so that the light L1 is totally reflected at the interface between the transparent low-refractive index layer 170 and the light guide plate 120, which can improve the light guiding effect of the light guide plate 120 and avoid light L1 dissipates from the second surface 124 of the light guide plate 120 .

The touch sensing layer 160 enables the front light display device 100 to have a touch function, and its material may include indium tin oxide (ITO). The surface treatment layer 180 is located on the surface 162 a of the touch sensing layer 160 facing away from the transparent low-refractive index layer 170 . The surface treatment layer 180 may be a hardcoat (hardcoating; HC), an anti-glare layer (anti-glare; AG) or an anti-reflection layer (anti-reflection; AR), which is not intended to limit the invention. The surface treatment layer 180 can improve the optical quality of the front light display device 100 , or enhance the strength of the front light display device 100 , and the designer can select the appropriate type of the surface treatment layer 180 according to requirements.

In this embodiment, the size of the light guide plate 120 is larger than the size of the reflective display module 110, so that the side of the light guide plate 120 with the third surface 126 protrudes from the reflective display module 110 for the light source 150 to be set, which can avoid the light source 150 is too close to the reflective display module 110 to affect brightness uniformity. In addition, the light guide plate 120 has a fourth surface 128 opposite to the third surface 126 , and the fourth surface 128 is coplanar with one side of the reflective display module 110 . The front light display device 100 also includes waterproof glue 190 . The waterproof adhesive 190 surrounds the reflective display module 110 and the optical adhesive 130 , and the waterproof adhesive 190 at least partially extends to the fourth surface 128 of the light guide plate 120 to prevent moisture from entering the reflective display module 110 .

It should be understood that in the following description. The previously described component materials and component connection relationships will not be repeated, and will be described first.

FIG. 2 is a cross-sectional view of a front light display device 100a according to another embodiment of the present invention. The front light display device 100a includes a reflective display module 110 , a light guide plate 120 , an optical glue 130 , a plurality of microstructures 140 , a light source 150 , a touch sensing layer 160 , a transparent low refractive index layer 170 and a surface treatment layer 180 . The difference from the embodiment in FIG. 1 is that the touch sensing layer 160 is located on the second surface 124 of the light guide plate 120, the transparent low-refractive index layer 170 is located on the surface 162b of the touch sensing layer 160 facing away from the light guide plate 120, and the surface The processing layer 180 is located on the surface 172 of the transparent low refractive index layer 170 facing away from the touch sensing layer 160 . With such a design, when the light source 150 emits light, although the light L2 can enter the touch sensing layer 160, the transparent low-refractive index layer 170 on the touch sensing layer 160 can reflect the light L2, so that the light L2 returns to the light guide plate 120, The light guiding effect of the light guide plate 120 can be improved.

In addition, the light L2 in FIG. 2 will only form reflected light rays R1a and R2a at the interface between the light guide plate 120 and the optical adhesive 130 and the interface between the optical adhesive 130 and the common electrode layer 118 , which can effectively reduce visual interference.

FIG. 3 is a flow chart of a manufacturing method of a front light display device according to an embodiment of the present invention. The manufacturing method of the front light display device includes the following steps. Firstly, in step S1, a plurality of microstructures are formed on the first surface of the light guide plate, wherein the material of the light guide plate includes glass. Next in step S2, the first surface of the light guide plate is pasted on the reflective display module by using optical glue.

Wherein, the step S1 of forming the microstructure may include: first coating an ultraviolet curable glue on the first surface of the light guide plate. Next, rolling or pressing is applied to the first surface of the light guide plate to shape the UV-curable glue. Finally, the UV-curable adhesive is irradiated with ultraviolet light, so that the UV-curable adhesive is cured to form a microstructure.

In addition, the manufacturing method of the front light display device may further include: forming a touch sensing layer on the second surface of the light guide plate. Then a transparent low refractive index layer is formed between the touch sensing layer and the light guide plate or on the surface of the touch sensing layer facing away from the light guide plate. If the transparent low refractive index layer is formed between the touch sensing layer and the light guide plate, the structure shown in Figure 1 can be obtained; if the transparent low refractive index layer is formed on the surface of the touch sensing layer facing away from the light guide plate, the structure shown in Figure 1 can be obtained. 2 structure.

In the following description, other forms of front light display devices will be described.

FIG. 4 is a cross-sectional view of a front light display device 100b according to another embodiment of the present invention. The front light display device 100b includes a reflective display module 110 , a light guide plate 120 , an optical adhesive 130 , a plurality of microstructures 140 , a light source 150 , a touch sensing layer 160 and a surface treatment layer 180 . The difference from the embodiment in FIG. 1 is that the front light display device 100b does not have the transparent low-refractive index layer 170 of the front light display device 100 in FIG. 1 . In this way, the thickness of the front light display device 100b is smaller than that of the front light display device 100 in FIG. 1 , which is helpful for thinner design.

FIG. 5 is a cross-sectional view of a front light display device 100c according to another embodiment of the present invention. The front light display device 100c includes a reflective display module 110 , a light guide plate 120 , an optical glue 130 , a plurality of microstructures 140 , a light source 150 , a touch sensing layer 160 and a surface treatment layer 180 . The difference from the embodiment shown in FIG. 4 is that the touch sensing layer 160 of the front light display device 100c is located between the microstructure 140 and the first surface 122 of the light guide plate 120, and the surface treatment layer 180 is located on the first surface 122 of the light guide plate 120. on two surfaces 124 . With such a design, the front light display device 100c still has a touch function, and the surface treatment layer 180 can improve the optical quality of the front light display device 100c or enhance the strength of the front light display device 100c, and the designer can choose an appropriate surface according to the requirement. Handle layers 180 kinds.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope is to be determined as defined by the claims.

Claims (19)

1. electro-optical display device before a kind, it is characterised in that described front electro-optical display device comprises:

Reflective display module；

Light guide plate, it has relative first surface and second surface, and adjoins described first surface and institute Stating the 3rd surface of second surface, the material of wherein said light guide plate comprises glass；

Optical cement, it is between described reflective display module and the described first surface of described light guide plate；

Multiple micro structures, it is positioned on the described first surface of described light guide plate；And

Light source, it is towards described 3rd surface of described light guide plate.

2. front electro-optical display device as claimed in claim 1, it is characterised in that described front electro-optical display device Also comprise:

Touch-control sensing layer, it is positioned on the described second surface of described light guide plate.

3. front electro-optical display device as claimed in claim 2, it is characterised in that described front electro-optical display device Also comprise:

Transparent low refractive index layer, it is between described touch-control sensing layer and described light guide plate, or is positioned at institute State touch-control sensing layer back on the surface of described light guide plate.

4. front electro-optical display device as claimed in claim 3, it is characterised in that described transparent low refractive index The refractive index of layer less than the refractive index of described light guide plate, and the refractive index of described transparent low refractive index layer between 1.3～1.45.

5. front electro-optical display device as claimed in claim 3, it is characterised in that described transparent low refractive index Layer is between described touch-control sensing layer and described light guide plate, and described front electro-optical display device also comprises:

Surface-treated layer, it is positioned at described touch-control sensing layer back on the surface of described transparent low refractive index layer.

6. front electro-optical display device as claimed in claim 5, it is characterised in that described surface-treated layer is Hard conating, Bewildering resistance layer or anti-reflecting layer.

7. front electro-optical display device as claimed in claim 3, it is characterised in that described transparent low refractive index Layer is positioned at described touch-control sensing layer back on the surface of described light guide plate, and described front electro-optical display device also comprises:

Surface-treated layer, it is positioned at described transparent low refractive index layer back on the surface of described touch-control sensing layer.

8. front electro-optical display device as claimed in claim 2, it is characterised in that described front electro-optical display device Also comprise:

Surface-treated layer, it is positioned at described touch-control sensing layer back on the surface of described light guide plate.

9. front electro-optical display device as claimed in claim 1, it is characterised in that described front electro-optical display device Also comprise:

Touch-control sensing layer, it is between the plurality of micro structure and the described first surface of described light guide plate.

10. front electro-optical display device as claimed in claim 1, it is characterised in that described front electro-optical display device Also comprise:

Surface-treated layer, it is positioned on the described second surface of described light guide plate.

11. front electro-optical display devices as claimed in claim 1, it is characterised in that the thickness of described optical cement More than the height of micro structure each described.

12. front electro-optical display devices as claimed in claim 1, it is characterised in that the thickness of described optical cement For h, the height of each described micro structure is d, and h > 5d.

13. front electro-optical display devices as claimed in claim 1, it is characterised in that the plurality of micro structure Material comprises ultraviolet cured adhesive.

14. front electro-optical display devices as claimed in claim 1, it is characterised in that the size of described light guide plate More than the size of described reflective display module, make described light guide plate have the side on described 3rd surface from Described reflective display module protrudes.

15. front electro-optical display devices as claimed in claim 1, it is characterised in that described light guide plate has phase The 4th surface to described 3rd surface, and the side of described 4th surface and described reflective display module Copline.

16. front electro-optical display devices as claimed in claim 15, it is characterised in that described front light display dress Put and also comprise:

Marine glue, it is around described reflective display module and described optical cement, and described marine glue is at least Extend partially into described 4th surface of described light guide plate.

The manufacture method of electro-optical display device before 17. 1 kinds, it is characterised in that the system of described front electro-optical display device Comprise as method:

A () forms multiple micro structure, the material of wherein said light guide plate on the first surface of described light guide plate Comprise glass；And

B () uses optical cement to be fitted on reflective display module by the described first surface of described light guide plate.

The manufacture method of 18. front electro-optical display devices as claimed in claim 17, it is characterised in that described Step (a) comprises:

Coated UV curable glue on the described first surface of described light guide plate；

Described first surface at described light guide plate imposes rolling process or pressing processes, and makes described ultraviolet light Solidification gum forming；And

Use ultraviolet light to irradiate described ultraviolet cured adhesive, make described ultraviolet light polymerization adhesive curing become institute State multiple micro structure.

The manufacture method of 19. front electro-optical display devices as claimed in claim 18, it is characterised in that described The manufacture method of front electro-optical display device also comprises:

The described second surface of described light guide plate is formed touch-control sensing layer；And

Back to described leaded light between described touch-control sensing layer and described light guide plate or at described touch-control sensing layer Transparent low refractive index layer is formed on the surface of plate.