TW201819967A - Reflective display apparatus - Google Patents

Abstract

A reflective display apparatus including a reflective display panel, a transparent cover plate, and at least one light source is provided. The transparent cover plate is disposed on one side of the reflective display panel. An air gap exists between the reflective display panel and the transparent cover plate. The at least one light source is disposed between the reflective display panel and the transparent cover plate, and a light emitted by the at least one light source travels towards the air gap prior to irradiate to the reflective display panel or the transparent cover plate.

Description

Reflective display device

The present invention relates to a display device, and more particularly to a reflective display device.

The reflective display device mainly uses a reflective display panel, such as an Electro-Phoretic Display (EPD) panel, to reflect external light and display the screen. Therefore, the reflective display device can directly use the lighting device in the space as the display light source. Furthermore, in order to increase the display brightness, a reflective display device can be installed in front of the lighting device. However, the installation of the lighting device is limited to many other conditions. For example, the lighting device must be installed according to the requirements of space brightness and decoration design, etc., and cannot provide an ideal display light source for the reflective display device. Therefore, the direct use of the illumination device as a display light source often causes problems such as uneven illumination areas or insufficient illumination brightness, which further causes poor display effects of the reflective display device.

The invention provides a reflective display device, which can achieve a uniform display effect.

The reflective display device of the present invention includes a reflective display panel, a transparent cover and a light source. The transparent cover is disposed on one side of the reflective display panel. There is an air gap between the reflective display panel and the transparent cover. The light source is disposed between the reflective display panel and the transparent cover plate, and the light emitted by the light source travels toward the air gap before irradiating the transparent cover plate or the reflective display panel.

In an embodiment of the present invention, the light source includes at least one light emitting element. Each of the at least one light emitting element has an optical axis, and the optical axis is parallel to a display surface of the reflective display panel.

In an embodiment of the present invention, the transparent cover plate is inclined with respect to the reflective display panel by an included angle, and the included angle is greater than 0 degrees and less than 45 degrees.

In an embodiment of the present invention, the light source includes at least one light emitting element. The half-intensity light emission angle of each of the at least one light-emitting element is less than 60 degrees.

In an embodiment of the present invention, the light source includes at least one light emitting element. An optical axis of each of the at least one light-emitting element meets the transparent cover to form an intersection, and the orthographic projection of the intersection on the reflective display panel is located on a center line of a display surface of the reflective display panel.

In an embodiment of the present invention, in a direction perpendicular to the above-mentioned reflective display panel, the shortest distance d1 between the reflective display panel and the transparent cover plate conforms to 0 ≦ d1 <W, where W is that at least one light-emitting element is vertically Height in the direction of the reflective display panel.

In an embodiment of the present invention, one end of the above-mentioned reflective display panel is in contact with the transparent cover, and the light source is located at the opposite end of the reflective display panel.

In an embodiment of the present invention, the above-mentioned reflective display panel is parallel to the transparent cover.

In an embodiment of the present invention, the light source includes at least one light emitting element. The half-intensity light emission angle of each of the at least one light-emitting element is less than 45 degrees.

In an embodiment of the present invention, the distance d2 between the reflective display panel and the transparent cover plate conforms to W <d2 <2W, where W is a height of the light emitting element in a direction perpendicular to the reflective display panel.

In an embodiment of the present invention, the light source includes a first light source and a second light source, which are respectively located at opposite ends of the transparent cover, wherein a light output direction of the first light source is opposite to a light output direction of the second light source.

In an embodiment of the present invention, the light source includes a first light source, a second light source, and a third light source, wherein the first light source and the second light source are located at opposite ends of the transparent cover, respectively. The light emitting direction of the first light source is opposite to the light emitting direction of the second light source. The third light source is located between the first light source and the second light source to be arranged in a C-shape.

In an embodiment of the present invention, the light source includes a first light source, a second light source, a third light source, and a fourth light source. The first light source, the second light source, the third light source, and the fourth light source are arranged in a ring shape and surround the edge of the transparent cover.

In an embodiment of the present invention, a functional plating film is formed on one side surface of the transparent cover plate.

In an embodiment of the present invention, the transparent cover plate includes a cover plate body and a functional coating film, and the functional coating film is disposed on the cover plate body.

Based on the above, the reflective display device of the embodiment of the present invention can uniformly reflect the light emitted from the light source to the reflective display panel through the transparent cover to achieve a uniform display effect.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic front view of a reflective display device according to a first embodiment of the present invention. FIG. 2 is a schematic side view of the reflective display device of FIG. 1. Please refer to FIG. 1 and FIG. 2 at the same time. In this embodiment, the reflective display device 100 includes a reflective display panel 110, a transparent cover 120, and a light source 130. The reflective display panel 110 is, for example, a color-type electro-phoretic display panel (EPD panel). The transparent cover 120 is disposed on one side of the reflective display panel 110. Actually, the transparent cover 120 is disposed on one side of the display surface 112 in the reflective display panel 110, that is, the transparent cover 120 is located above the display surface 112. There is an air gap G1 between the reflective display panel 110 and the transparent cover 120, and the light source 130 is disposed between the reflective display panel 110 and the transparent cover 120 and is located in the air gap G1. For example, the transparent cover plate 120 can be abutted against the light source 130 or other supporting structure (not shown) so that the transparent cover plate 120 does not adhere to the entire display surface 112 of the reflective display panel 110 to An air gap G1 is formed between the reflective display panel 110 and the transparent cover 120.

The transparent cover 120 may be a polygon cover, and the transparent cover 120 is inclined with respect to the reflective display panel 110 by an included angle θ, and the included angle θ is greater than 0 degrees and less than 45 degrees. The material of the transparent cover 120 may be a transparent plastic material, for example, a transparent plastic material such as polycarbonate (PC), polymethylmethacrylate (PMMA), or the like. Alternatively, glass materials can be used to make the transparent cover 120, such as soda-lime glass, low-iron glass, quartz glass, aluminosilicate glass, etc., but the present invention is not limited thereto.

The transparent cover plate 120 may include a functional coating film 122 and a cover plate body 124, and the functional coating film 122 is disposed on the cover plate body 124. The functional coating 122 can provide different functions according to requirements, such as anti-reflection, anti-glare, anti-fingerprint, and anti-smudge functions. The functional coating film 122 may also be a composite coating film, which has at least two or more of the above functions. The functional coating film 122 may be disposed on a side of the transparent cover 120 adjacent to a user or a viewer, but the present invention is not limited thereto. In other embodiments, the functional coating film 122 may be disposed on a side of the transparent cover 120 adjacent to the reflective display panel 110. In another embodiment, the functional coating film 122 may be directly formed on the transparent cover plate 120.

The light source 130 is disposed between the reflective display panel 110 and the transparent cover 120. The light source 130 includes a plurality of light emitting elements 140, and the light emitting elements 140 are arranged in a row. Therefore, the light source 130 in this embodiment is, for example, a strip light source. The position of the light source 130 may correspond to one edge of the transparent cover 120. In some embodiments, the light emitting elements 140 may each be a light emitting element suitable for emitting light and arranged in a row to form a strip-shaped light source. For example, each light-emitting element 140 may be a light-emitting diode, but is not limited thereto.

FIG. 3 is a schematic diagram of a half-intensity light emission angle of a single light-emitting element in FIG. 1. Please refer to FIG. 2 and FIG. 3. In this embodiment, each light-emitting element 140 has an optical axis A, and the light-emitting element 140 is disposed so that the optical axis A is parallel to the display surface 112 of the reflective display panel 110. Generally, when the light emitting element 140 is a light emitting diode, the optical axis A may be a virtual axis passing through the center of the light emitting surface of the light emitting diode and perpendicular to the light emitting surface. Alternatively, the optical axis A may be a virtual axis defined by the measurement result after measuring the light-emitting effect of the light-emitting element 140. In this embodiment, the half-intensity light emission angle φ1 of each of the light-emitting elements 140 is less than 60 degrees. For example, the half-intensity light emission angle φ1 of each light-emitting element 140 may be 55 degrees.

As can be seen from FIG. 2, the light source 130 is sandwiched between the reflective display panel 110 and the transparent cover 120 and is adapted to emit light L toward the air gap G1. Therefore, the light L emitted from the light source 130 travels through the air gap G1 between the reflective display panel 110 and the transparent cover plate 120 before irradiating the transparent cover 120 or the reflective display panel 110. Specifically, the light L emitted from the light source 130 is not a parallel light beam but has a certain divergence angle. Therefore, part of the light L1 will irradiate the surface 120S of the transparent cover 120 adjacent to the reflective display panel 110, and part of the light L2 will irradiate the display surface 112 of the reflective display panel 110. The light L1 is reflected by the surface 120S of the transparent cover plate 120, and then irradiates the display surface 112 of the reflective display panel 110. Therefore, both the light L1 and the light L2 can be irradiated to the display surface 112 of the reflective display panel 110 as the display light of the reflective display panel 110. In this way, the reflection of the transparent cover 120 can increase the exposure of the light L on the display surface 112 to increase the brightness of the display screen, so that the reflective display device 100 can obtain a good display effect. Of course, because the transparent cover 120 is transparent, a part of the light L can be directly emitted by the transparent cover 120, and the light reflected by the reflective display panel 110 can also penetrate the transparent cover 120 for the user or viewing The person sees the display.

Because the transparent cover 120 is inclined at an angle θ with respect to the reflective display panel 110, compared to the light L2, the light L1 can reflect the area of the reflective display panel 110 that is far from the light source 130 after being reflected by the transparent cover 120. This increases the display brightness presented in the reflective display panel 110 that is farther away from the light source 130. Therefore, the display effect of the reflective display device 100 can be more uniform under the configuration of the light source 130 and the transparent cover 120.

In some embodiments, in the direction D perpendicular to the reflective display panel 110, the shortest distance d1 between the reflective display panel 110 and the transparent cover 120 conforms to 0 ≦ d1 <W, where W is the light emitting element 140 in the direction D Measured height. In this way, the transparent cover 120 can be inclined with respect to the reflective display panel 110 by an included angle θ. In the embodiment where the shortest distance d1 is 0, one end of the reflective display panel 110 can abut against the transparent cover 120, and the light source 130 is located at the opposite end of the reflective display panel 110. In some embodiments, the end of the reflective display panel 110 adjacent to the light source 130 may be separated from the transparent cover 120 by 3.5 cm, and the other end of the reflective display panel 110 away from the light source 130 may be separated from the transparent cover 120 by 3 cm (that is, The shortest distance d1 is 3 cm), but this is for illustration purposes only, and this embodiment is not limited thereto.

In addition, when the center line C of the display surface 112 is defined as a virtual line that can divide the display area of the reflective display panel 110 into two equal parts, the inclination of the transparent cover 120 can be designed so that the optical axis A of each light-emitting element 140 It meets the transparent cover 120 at an intersection point P, and the orthographic projection of the intersection point P on the reflective display panel 110 is located on the center line C of the display surface 112 of the reflective display panel 110. Such an arrangement helps to increase the display brightness of the reflective display panel 110 in a region farther from the light source 130, and makes the display effect of the overall reflective display device 100 more uniform. In addition, the inclination of the transparent cover 120 with respect to the reflective display panel 110 can be adjusted according to requirements or types of light sources, so that the display surface 112 of the reflective display panel 110 obtains more light L1 reflected from the transparent cover 120. Or, the light L emitted from the light source 130 can be more uniformly irradiated on the display surface 112 of the reflective display panel 110 to obtain a better display effect.

FIG. 4 is a schematic side view of a reflective display device according to a second embodiment of the present invention. FIG. 5 is a schematic diagram of a half-intensity light emission angle of a single light-emitting element in FIG. 4. Please refer to FIGS. 1, 4 and 5. The reflective display device 200 of this embodiment is similar to the reflective display device 100 of FIG. 1. The reflective display device 200 includes a reflective display panel 110, a transparent cover 220, and a light source 230. The main difference between the reflective display device 200 and the reflective display device 100 of FIG. 1 is, for example, that the transparent cover 220 of the reflective display device 200 is parallel to the reflective display panel 110, and the light source 230 can use different specifications of light emission. Element 240 is implemented. Specifically, the transparent cover 220 is disposed on one side of the reflective display panel 110 in parallel, so that there is an air gap G2 between the display surface 112 of the reflective display panel 110 and the transparent cover 220. The light source 230 is disposed between the reflective display panel 110 and the transparent cover 220, and the light source 230 is adapted to emit light L toward the air gap G2.

The distance d2 between the reflective display panel 110 and the transparent cover 220 conforms to W <d2 <2W, where W is a height measured by the light emitting element 140 in the direction D. For example, the distance d2 between the reflective display panel 110 and the transparent cover 220 can be 3 cm, but it can also be adjusted according to different design requirements. In addition, the light source 230 of this embodiment includes at least one light-emitting element 240 as shown in FIG. 5, and the half-intensity light-emitting angle φ2 of each of the light-emitting elements 240 is less than 45 degrees. For example, the half-intensity light emission angle φ2 of each light-emitting element 240 may be 40 degrees. In this way, part of the light L1 may be irradiated on the surface 220S of the transparent cover 220 adjacent to the display surface 112, and part of the light L2 may be irradiated on the display surface 112 of the reflective display panel 110. In addition, since the light ray L1 is irradiated obliquely on the surface 220S of the transparent cover plate 220, it can be reflected by the surface 220S and then irradiate the display surface 112 of the reflective display panel 110. Therefore, both the light ray L1 and the light ray L2 can be irradiated to the reflective surface 112 as light for display. In other words, in this embodiment, the reflection amount of the light L1 by the transparent cover 220 can increase the irradiation amount of the light L on the display surface 112, so that the reflective display device 200 can obtain a good display effect. In addition, the reflection of the light L1 by the transparent cover 220 allows the light L1 to be irradiated to the area of the reflective display panel 110 that is far from the light source 230, thereby helping to make the display brightness of the reflective display device 200 more uniform.

FIG. 6 is a schematic front view of a reflective display device according to a third embodiment of the present invention. Please refer to FIG. 6. The reflective display device 200A of this embodiment is similar to the reflective display device 200 of FIG. 4. The reflective display panel 110 and the transparent cover 220 are disposed parallel to each other. The main difference between the two is, for example, that The reflective display device 200A includes a first light source 232 and a second light source 234. The first light source 232 and the second light source 234 are disposed between the reflective display panel 110 and the transparent cover plate 220 and are respectively located at opposite ends of the transparent cover plate 220. The light output direction of the first light source 232 is opposite to the second light source 234. Direction of light. In other words, in the reflective display device 200A, there are two light sources respectively disposed at opposite ends, and the two light sources emit light toward each other. The first light source 232 and the second light source 234 each include a plurality of light emitting elements 240, and the light emitting element 240 has a half-intensity light emitting angle φ2 as shown in FIG. 5, which is less than 45 degrees. Therefore, a part of the light emitted by the first light source 232 and the second light source 234 can be obliquely irradiated on the transparent cover 220 and reflected by the transparent cover 220 to illuminate the reflective display panel 110 as the light required for the display screen. . In this way, the reflective display device 200A of this embodiment can obtain a good display effect.

FIG. 7 is a schematic front view of a reflective display device according to a fourth embodiment of the present invention. Please refer to FIG. 7. The reflective display device 200B of this embodiment is similar to the reflective display device 200A of FIG. 6. The reflective display panel 110 and the transparent cover 220 are disposed parallel to each other, but the main difference between the two is, for example, that The reflective display device 200B includes a first light source 232, a second light source 234, and a third light source 236. The first light source 232, the second light source 234, and the third light source 236 are disposed between the reflective display panel 110 and the transparent cover 220, and the first light source 232, the second light source 234, and the third light source 236 respectively correspond to the transparent cover The three sides of the 220 are set.

Specifically, the first light source 232 and the second light source 234 are respectively located at opposite ends of the transparent cover plate 220, and the light output direction of the first light source 232 is opposite to the light output direction of the second light source 234. The third light source 236 is located between the first light source 232 and the second light source 234. In other words, the reflective display device 200B has three light sources arranged at the edge of the transparent cover 220. The three light sources are arranged in a C-shape, and all of them emit light toward the center of the reflective display device 200B. In this embodiment, the notch direction of the C-shaped arrangement can be selected according to the use situation, and it is not limited to the configuration shown in FIG. 7.

Each of the first light source 232, the second light source 234, and the third light source 236 includes a plurality of light emitting elements 240, and the light emitting element 240 has a half-intensity light emitting angle φ2 as shown in FIG. 5, which is, for example, less than 45 degrees. Therefore, a part of the light emitted by the first light source 232, the second light source 234, and the third light source 236 can be obliquely irradiated on the transparent cover 220 and reflected by the transparent cover 220 to illuminate the reflective display panel 110 as a display. The light needed for the picture. In this way, the reflective display device 200B can obtain a good display effect.

FIG. 8 is a schematic front view of a reflective display device according to a fifth embodiment of the present invention. Referring to FIG. 8, the reflective display device 200C of this embodiment is similar to the reflective display device 200A of FIG. 6. The reflective display panel 110 and the transparent cover 220 are disposed parallel to each other, but the main difference between the two is, for example, that The reflective display device 200C includes a first light source 232, a second light source 234, a third light source 236, and a fourth light source 238. The first light source 232, the second light source 234, the third light source 236, and the fourth light source 238 are disposed between the reflective display panel 110 and the transparent cover 220, and the first light source 232, the second light source 234, the third light source 236, and The fourth light source 238 is arranged in a ring shape and surrounds the edge of the transparent cover 220. In other words, in the reflective display device 200C, there are four light sources arranged at the edge of the transparent cover 220, and the four light sources are arranged opposite each other and surround the edge of the reflective display panel 110.

The first light source 232, the second light source 234, the third light source 236, and the fourth light source 238 each include a plurality of light emitting elements 240, and the light emitting element 240 has a half-intensity light emitting angle φ2 as shown in FIG. 5, which is, for example, less than 45 degrees. Therefore, part of the light emitted by the first light source 232, the second light source 234, the third light source 236, and the fourth light source 238 can be obliquely irradiated on the transparent cover 220 and reflected by the transparent cover 220 to illuminate the reflective display. The panel 110 is used as light required for displaying a screen. In this way, the reflective display device 200C can obtain a good display effect.

In summary, the reflective display device of the embodiment of the present invention can reflect the light emitted from the light source to the reflective display panel through the transparent cover to increase the display brightness and achieve a uniform display effect. In addition, the use of light emitting elements with relatively concentrated light emission angles can also help achieve a uniform display effect.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

100, 200, 200A, 200B, 200C‧‧‧Reflective display device

110‧‧‧Reflective display panel

112‧‧‧display surface

120, 220‧‧‧ transparent cover

120S, 220S‧‧‧ Surface

122‧‧‧ Functional Coating

124‧‧‧ cover body

130, 230‧‧‧ light source

140, 240‧‧‧ light emitting elements

232‧‧‧First light source

234‧‧‧second light source

236‧‧‧ third light source

238‧‧‧Fourth light source

A‧‧‧ Optical axis

C‧‧‧ Centerline

D‧‧‧ direction

d1, d2‧‧‧ distance

G1, G2‧‧‧Air gap

L, L1, L2‧‧‧‧light

P‧‧‧ intersection

W‧‧‧ height

θ‧‧‧ angle

φ1, φ2‧‧‧angle

FIG. 1 is a schematic front view of a reflective display device according to a first embodiment of the present invention. FIG. 2 is a schematic side view of the reflective display device of FIG. 1. FIG. 3 is a schematic diagram of a half-intensity light emission angle of a single light-emitting element in FIG. 1. FIG. 4 is a schematic side view of a reflective display device according to a second embodiment of the present invention. FIG. 5 is a schematic diagram of a half-intensity light emission angle of a single light-emitting element in FIG. 4. FIG. 6 is a schematic front view of a reflective display device according to a third embodiment of the present invention. FIG. 7 is a schematic front view of a reflective display device according to a fourth embodiment of the present invention. FIG. 8 is a schematic front view of a reflective display device according to a fifth embodiment of the present invention.

Claims (15)

A reflective display device includes: a reflective display panel; a transparent cover plate disposed on one side of the reflective display panel; an air gap between the reflective display panel and the transparent cover plate; and a light source Is disposed between the reflective display panel and the transparent cover, and the light emitted by the light source travels toward the air gap before irradiating the transparent cover or the reflective display panel. The reflective display device according to item 1 of the patent application scope, wherein the light source includes at least one light emitting element, each of the at least one light emitting element has an optical axis, and the optical axis is parallel to a display surface of the reflective display panel . The reflective display device according to item 1 of the scope of patent application, wherein the transparent cover is inclined with respect to the reflective display panel by an included angle, and the included angle is greater than 0 degrees and less than 45 degrees. The reflective display device according to item 3 of the scope of patent application, wherein the light source includes at least one light emitting element, and a half-intensity light emitting angle of each of the at least one light emitting element is less than 60 degrees. The reflective display device according to item 3 of the scope of patent application, wherein the light source includes at least one light emitting element, an optical axis of each of the at least one light emitting element intersects with the transparent cover plate, and the intersection point is at the reflection The orthographic projection of the reflective display panel is located on the center line of a display surface of the reflective display panel. The reflective display device according to item 3 of the scope of patent application, wherein in a direction perpendicular to the reflective display panel, the shortest distance d1 between the reflective display panel and the transparent cover plate conforms to 0 ≦ d1 <W, where W is the height of the at least one light emitting element in the direction. The reflective display device according to item 3 of the scope of patent application, wherein one end of the reflective display panel abuts the transparent cover plate, and the light source is located at the opposite end of the reflective display panel. The reflective display device according to item 1 of the scope of patent application, wherein the reflective display panel is parallel to the transparent cover. The reflective display device according to item 8 of the scope of patent application, wherein the light source includes at least one light emitting element, and a half-intensity light emitting angle of each of the at least one light emitting element is less than 45 degrees. The reflective display device according to item 8 of the scope of patent application, wherein the distance d2 between the reflective display panel and the transparent cover plate conforms to W <d2 <2W, where W is that the at least one light-emitting element is perpendicular to the reflective display. The height in the direction of the display panel. The reflective display device according to item 10 of the scope of patent application, wherein the light source includes a first light source and a second light source, which are located at opposite ends of the transparent cover, respectively, wherein the light output direction of the first light source is opposite to that of the first light source. Direction of light from two light sources. The reflective display device as described in claim 10, wherein the light source includes a first light source, a second light source, and a third light source, and the first light source and the second light source are located on opposite sides of the transparent cover, respectively. The light emitting direction of the first light source is opposite to the light emitting direction of the second light source. The third light source is located between the first light source and the second light source to be arranged in a C-shape. The reflective display device according to item 10 of the scope of patent application, wherein the light source includes a first light source, a second light source, a third light source, and a fourth light source; the first light source, the second light source, the third light source, and The fourth light source is arranged in a ring shape and surrounds the edge of the transparent cover. The reflective display device according to item 1 of the scope of patent application, wherein a functional coating is formed on one side surface of the transparent cover. The reflective display device according to item 1 of the patent application scope, wherein the transparent cover includes a cover body and a functional coating film, and the functional coating film is disposed on the cover body.