CN106383424A - Reflective display device - Google Patents

Abstract

The invention discloses a reflective display device, which comprises an electrophoretic display module, an adhesive layer and a color filter layer. The adhesive layer is positioned on the electrophoretic display module. The color filter layer is located on the adhesive layer, and the adhesive layer is located between the electrophoretic display module and the color filter layer. The color filter layer comprises at least one color resistor. The color resistor has at least one opening for light to pass through. Through the design, the reflectivity and the brightness of the reflective display device can be improved.

Description

reflective display device

technical field

The invention relates to a reflective display device.

Background technique

In the current market of various consumer electronic products, electrophoretic display devices have been widely used as display screens. The display medium layer of the electrophoretic display device is mainly composed of electrophoretic fluid and white and black particles mixed in the electrophoretic fluid. By applying a voltage to the display medium layer, the white and black particles can be driven to move, so that each pixel displays black, white or grayscale respectively. Since the electrophoretic display device uses incident light to irradiate the display medium layer to form reflected light to achieve the purpose of display, it does not need a backlight source and can save power consumption. The incident light can be sunlight or indoor ambient light.

In addition, in the electrophoretic display device with color display function, a layer of color filter array (color filter array; CFA) is pasted on the display medium layer. When the light enters and exits the color filter layer, the light of a specific wavelength will be filtered out by the color resist of the color filter layer. For example, after the light passes through the red color resistance, the color of the light will also be converted to red. However, when the incident light enters the color electrophoretic display device, it will pass through the color resistance of the color filter layer. Then the incident light will be reflected by the display medium layer to form reflected light, and the reflected light will pass through the color resistance of the color filter layer to the outside of the display device. In this way, the light will pass through the color filter layer twice (once into the light, once out of the light) and will be lost twice, so that the brightness and reflectance of the color electrophoretic display device will be reduced, and the reflectance is about 12.

Generally speaking, in order to reduce the light loss of the color electrophoretic display device, a newly developed display medium layer can be replaced to increase the brightness, but the stability may not be good, and the manufacturing cost will be increased. Alternatively, the color resist concentration of the color filter layer can be reduced to increase the reflectivity of the electrophoretic display device, but the color saturation will be reduced.

Contents of the invention

The purpose of the present invention is to provide a reflective display device, which can improve the reflectivity and brightness of the display device.

A technical example of the present invention is a reflective display device.

According to an embodiment of the present invention, a reflective display device includes an electrophoretic display module, an adhesive layer and a color filter layer. The adhesive layer is located on the electrophoretic display module. The color filter layer is located on the adhesive layer, and the adhesive layer is located between the electrophoretic display module and the color filter layer. The color filter layer includes at least one color resist. The color resist has at least one opening for light to pass through.

In one embodiment of the present invention, the shape of the opening of the color resist is square, circular or polygonal.

In one embodiment of the present invention, the width of the opening of the color resist is between 10 microns and 25 microns.

In an embodiment of the present invention, when a plurality of incident light rays enter the opening of the color resist and are reflected by the electrophoretic display module, a plurality of reflected light rays are formed, and the reflected light passes through a region of the color resist surrounding the opening.

In one embodiment of the present invention, the opening is located at the center of the area.

In one embodiment of the present invention, the width of the above-mentioned region is between 70 microns and 85 microns.

In one embodiment of the present invention, the color of the color resist is red, green, blue or yellow.

In one embodiment of the present invention, the electrophoretic display module includes a display medium layer, a protective layer and an array substrate. The protection layer is located between the display medium layer and the adhesive layer. The display medium layer is located between the array substrate and the protection layer.

In one embodiment of the present invention, the array substrate has at least one thin film transistor, and the orthographic projection of the color resister on the array substrate at least partially overlaps with the thin film transistor.

In one embodiment of the present invention, the material of the protective layer includes polyethylene terephthalate, and the thickness of the protective layer is between 20 microns and 30 microns.

In an embodiment of the present invention, the color filter layer further includes at least one blank area. The blank area is adjacent to the edge of the color resist.

In one embodiment of the present invention, the thickness of the adhesive layer is between 60 microns and 80 microns.

In one embodiment of the present invention, there are multiple color resists, and some of the color resists each have openings.

In the above embodiments of the present invention, since the color resistance of the color filter layer has openings, the incident light entering through the openings of the color resistance will not lose light quantity. After the incident light is reflected by the electrophoretic display module, the reflected light passes through the color resist and has a color. That is to say, as long as the incident light enters the reflective display device from the opening of the color resist, the light quantity of the reflected light will only be lost by passing through the color resist once. In addition, when the incident light enters the reflective display device from the color resist near the opening, the incident light has color and light loss. After the incident light is reflected by the electrophoretic display module, reflected light passing through the opening of the color resist can be formed. That is to say, as long as the reflected light exits the reflective display device from the opening of the color resist, the amount of light will only be lost by passing through the color resist once. Therefore, both reflectivity and brightness of the reflective display device of the present invention can be improved.

Description of drawings

FIG. 1 is a top view of a color filter layer of a reflective display device according to an embodiment of the invention.

FIG. 2 is a cross-sectional view of the reflective display device in FIG. 1 along line 2 - 2 .

FIG. 3 is an enlarged view of the color resist of FIG. 1 .

FIG. 4 is a top view of a color resist according to an embodiment of the present invention.

FIG. 5 is a top view of a color resist according to an embodiment of the present invention.

FIG. 6 is a top view of a color resist according to an embodiment of the present invention.

FIG. 7 illustrates a top view of a color resist according to an embodiment of the present invention.

FIG. 8 is a top view of a color resist according to an embodiment of the present invention.

detailed description

A number of embodiments of the present invention will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some well-known and commonly used structures and elements will be shown in a simple and schematic manner in the drawings.

FIG. 1 shows a top view of a color filter layer 110 of a reflective display device 100 according to an embodiment of the invention. FIG. 2 is a cross-sectional view of the reflective display device 100 in FIG. 1 along line 2 - 2 . Referring to FIG. 1 and FIG. 2 at the same time, the reflective display device 100 includes a color filter layer 110 , an electrophoretic display module 120 and an adhesive layer 130 . The adhesive layer 130 is located on the electrophoretic display module 120 . The color filter layer 110 is located on the adhesive layer 130 , and the adhesive layer 130 is located between the electrophoretic display module 120 and the color filter layer 110 . The color filter layer 110 includes color resists 112 , 114 , 116 . In this embodiment, the color resist 112 is red, the color resist 114 is green, and the color resist 116 is blue, but not limited thereto, for example, the color filter layer 110 may also include yellow color resist. In addition, each color resist 112, 114, 116 has at least one opening 113 through which light can pass. In this embodiment, the color resistors 112 , 114 , and 116 each have four openings 113 , but the number of openings 113 is not intended to limit the present invention. In other embodiments, part of the color resistors may have openings 113, while part of the color resistors may not have openings 113. For example, the color resistor 114 in the lower right corner of FIG. Depends on the needs of the designer.

The electrophoretic display module 120 includes a display medium layer 122 , a protective layer 124 and an array substrate 126 . The protection layer 124 is located between the display medium layer 122 and the adhesive layer 130 , and the display medium layer 122 is located between the array substrate 126 and the protection layer 124 . The display medium layer 122 can be used to reflect light. In the following description, the light entering the color resist 112 in FIG. 2 will be taken as an example for illustration. In fact, the light can also enter the color resist 114 or the color resist 116 .

When the incident light L1 passes through the color resist 112 and enters the reflective display device 100 , the incident light L1 is reflected by the display medium layer 122 to form reflected light L2 and L2a. The reflected light L2, L2a can pass through the color resist 112 to emerge. Since the light quantity of the reflected light rays L2 and L2a will be lost by passing through the color resist 112 twice, and the light quantity passing through the color resist 112 once will lose about 70%, so the brightness of the reflected light rays L2 and L2a is low. Known reflective display devices only have this type of reflected light L2, L2a.

However, the color resist 112 of the color filter layer 110 of the present invention has an opening 113 , so the incident light L3 entering through the opening 113 of the color resist 112 will not have light loss. After the incident light L3 is reflected by the display medium layer 122 of the electrophoretic display module 120 , the reflected light L4 and L4a will pass through the color resist 112 to have a color (for example, red). That is to say, as long as the incident light L3 enters the reflective display device 100 from the opening 113 of the color resist 112 , the light quantity of the reflected light L4 , L4 a will only be lost by passing through the color resist 112 once.

In addition, when the incident light L5 enters the reflective display device 100 from the color resist 112 near the opening 113 , the incident light L5 has a color (for example, red) and there is light loss. After the incident light L5 is reflected by the display medium layer 122 of the electrophoretic display module 120 , a reflected light L6 a passing through the opening 113 of the color resist 112 can be formed. That is to say, as long as the reflected light L6 a exits the reflective display device 100 from the opening 113 of the color resist 112 , the amount of light will only be lost by passing through the color resist 112 once.

Therefore, the brightness of the reflected light L4, L4a and reflected light L6a in FIG. 2 is greater than the brightness of the reflected light L2, L2a, so that the reflectivity and brightness of the reflective display device 100 of the present invention can be improved, for example, the reflectivity can be improved. to 13-15.

In this embodiment, there is an included angle θ between each incident ray and the corresponding reflected ray, for example, between the incident ray L1 and the reflected ray L2, between the incident ray L3 and the reflected ray L4, and between the incident ray L5 and the reflected ray L6a There is an included angle θ of about 15 degrees between them. In addition, on the surface of the color filter layer 110, there is a distance D between each incident ray and the corresponding reflected ray, for example, between the incident ray L1 and the reflected ray L2, between the incident ray L3 and the reflected ray L4, and between the incident ray L5 There is a distance D of about 30 microns between them and the reflected light L6a.

In this embodiment, the color filter layer 110 further includes at least one blank area 118 . The blank area 118 may be adjacent to the edges of the color resists 112 , 116 . When the light enters the reflective display device 100 from the blank area 118 , it can be reflected by the display medium layer 122 of the electrophoretic display module 120 , and the reflected light can exit from the blank area 118 . Because light enters and exits the blank area 118 of the color filter layer 110 without passing through the colored color resists 112 , 114 , 116 , the blank area 118 can be used to display gray scale, black or white images.

In addition, the array substrate 126 has at least one thin film transistor 127 , and the orthographic projection of the color resistor 112 on the array substrate 126 at least partially overlaps with the thin film transistor 127 . With such a design, the array substrate 126 can control the display medium layer 122 to reflect or not reflect the light entering the color resist 112 , which is beneficial to the change of the display image.

In this embodiment, the material of the protective layer 124 includes polyethylene terephthalate (PET), and the thickness H1 of the protective layer 124 is between 20 micrometers and 30 micrometers. The thickness H2 of the adhesive layer 130 is between 60 μm and 80 μm, and it can be optical clear resin (OCR).

FIG. 3 is an enlarged view of the color resist 112 in FIG. 1 . Referring to FIG. 2 and FIG. 3 at the same time, the shape of the opening 113 of the color resist 112 is square, but in other embodiments, the shape of the opening 113 can also be circular or polygonal. The width W1 of the opening 113 of the color resist 112 may range from 10 microns to 25 microns. When the incident light L3 enters the opening 113 of the color resist 112 and is reflected by the display medium layer 122 of the electrophoretic display module 120, reflected light L4, L4a will be formed, and the reflected light L4, L4a will be in the area A of the color resist 112 surrounding the opening 113 wear out. The opening 113 is located at the center of the area A. As shown in FIG. Since there is a distance D (for example, 30 micrometers) between the incident light L3 and the reflected light L4 (or reflected light L4a) on the surface of the color filter layer 110, and the opening 113 has a width W1, the width W2 of the region A can be between 70 microns to 85 microns.

In this embodiment, the reflected light in area A (including the opening 113 ) is only lost by passing through the color resist 112 once, while the reflected light outside the area A is affected by the light passing through the color resist 112 twice Loss. Therefore, the luminance in area A will be higher than the luminance outside area A. In addition, since the reflected light in the area A only passes through the color resist 112 once, the color in the area A will be lighter than the color outside the area A. The designer can arrange the number and positions of the openings 113 in the color resists 112 , 114 , and 116 (see FIG. 1 ) according to actual needs, so as to achieve a balance between the brightness and color density of the reflective display device 100 .

It should be understood that the previously described relationship between component materials and component connections will not be repeated. In the following description, color resists with other arrangements of openings will be described.

FIG. 4 is a top view of a color resist 112a according to an embodiment of the invention. The difference from the embodiment in FIG. 3 is that the color resist 112a has five openings 113, and one of the openings 113 is located at the center of the color resist 112a. Since the number of openings 113 of the color resist 112a is more than that of the color resist 112 of FIG. 3 , the brightness and reflectance measured at the color resist 112a are higher than those measured at the color resist 112 of FIG. 3 .

FIG. 5 is a top view of a color resist according to an embodiment of the present invention. The difference from the embodiment shown in FIG. 4 is that the color resist 112b has six openings 113, three openings 113 are arranged in one row, and the other three openings 113 are arranged in another row, and the openings 113 of these two rows are parallel to each other. Since the number of openings 113 of the color resist 112b is more than that of the color resist 112a in FIG.

FIG. 6 shows a top view of a color resist 112c according to an embodiment of the invention. The difference from the embodiment shown in FIG. 5 is that the color resist 112c has seven openings 113, and one of the openings 113 is located at the center of the color resist 112c. Since the number of openings 113 of the color resist 112c is more than that of the color resist 112b in FIG. 5 , the brightness and reflectance measured at the color resist 112c are higher than those measured at the color resist 112b of FIG. 5 .

FIG. 7 shows a top view of a color resist 112d according to an embodiment of the invention. The difference from the embodiment in FIG. 6 is that the color resist 112d has eight openings 113, and one of the openings 113 is located between the two openings 113 below the color resist 112d. Since the number of openings 113 of the color resist 112d is larger than that of the color resist 112c in FIG. 6 , the brightness and reflectance measured at the color resist 112d are higher than those measured at the color resist 112c of FIG. 6 .

FIG. 8 shows a top view of a color resist 112e according to an embodiment of the invention. The difference from the embodiment shown in FIG. 7 is that the color resist 112e has nine openings 113, and one of the openings 113 is located between the two openings 113 above the color resist 112e, arranged in a nine-square grid. Since the number of openings 113 of the color resist 112e is larger than that of the color resist 112d in FIG.

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 (13)

1. a kind of reflective display is it is characterised in that described reflective display comprises：

Electrophoresis display module；

Adhesive-layer, it is located on described electrophoresis display module；And

Chromatic filter layer, it is located on described adhesive-layer, and described adhesive-layer is located at described electrophoresis showed mould Between block and described chromatic filter layer, described chromatic filter layer comprises：

At least one color blocking, and described color blocking has at least one opening, with passing through for light.

2. reflective display as claimed in claim 1 is it is characterised in that the shape of described opening For square, circular or polygon.

3. reflective display as claimed in claim 1 is it is characterised in that the width of described opening Between 10 microns to 25 microns.

4. reflective display as claimed in claim 1 is it is characterised in that work as multiple incident raies Enter described opening and after being reflected by described electrophoresis display module, form multiple reflection lights, and described anti- Penetrate light to pass around a region of described opening in described color blocking.

5. reflective display as claimed in claim 4 is it is characterised in that described opening is located at institute State the center in region.

6. reflective display as claimed in claim 4 is it is characterised in that the width in described region Between 70 microns to 85 microns.

7. reflective display as claimed in claim 1 is it is characterised in that the color of described color blocking For red, green, blue or yellow.

8. reflective display as claimed in claim 1 is it is characterised in that described electrophoresis showed mould Block comprises：

Display dielectric layer；

Protective layer, it is located between described display dielectric layer and described adhesive-layer；And

Array base palte, described display dielectric layer is located between described array base palte and described protective layer.

9. reflective display as claimed in claim 8 is it is characterised in that described array base palte has There is at least one membrane transistor, and described color blocking is in the orthographic projection of described array base palte and described thin-film electro Crystal is least partially overlapped.

10. reflective display as claimed in claim 8 is it is characterised in that the material of described protective layer Matter comprises polyethylene terephthalate, and the thickness of described protective layer is between 20 microns to 30 microns.

11. reflective displays as claimed in claim 1 are it is characterised in that described chromatic filter layer Also comprise：

At least one clear area, is adjacent to the edge of described color blocking.

12. reflective displays as claimed in claim 1 are it is characterised in that the thickness of described adhesive-layer Degree is between 60 microns to 80 microns.

13. reflective displays as claimed in claim 1 are it is characterised in that the quantity of described color blocking For multiple and partial described color blockings, respectively there is described opening.