阅读说明：本技术 反射式显示装置 (Reflective display device ) 是由 张佳祺 陈执群 吴淇铭 王以靓 陈家弘 林政贤 于 2019-01-11 设计创作，主要内容包括：本发明公开了一种反射式显示装置,其包含薄膜晶体管阵列基板、前面板、前保护片、背保护片、光阻挡层与光源。前面板位于薄膜晶体管阵列基板上。前面板具有透光膜与显示介质层。显示介质层位于透光膜与薄膜晶体管阵列基板之间。前保护片位于前面板上。背保护片位于薄膜晶体管阵列基板下方。光阻挡层至少覆盖背保护片的侧面。光源朝向前面板的侧面、薄膜晶体管阵列基板的侧面与背保护片的侧面。此反射式显示装置可避免光在背保护片中传递,以避免薄膜晶体管阵列基板的主动区的薄膜晶体管元件光漏电,产生褪色(fading)的现象,因此可提升显示品质。(The invention discloses a reflective display device, which comprises a thin film transistor array substrate, a front panel, a front protection sheet, a back protection sheet, a light blocking layer and a light source. The front panel is positioned on the thin film transistor array substrate. The front panel has a light-transmitting film and a display medium layer. The display medium layer is positioned between the light-transmitting film and the thin film transistor array substrate. The front protective sheet is positioned on the front panel. The back protection sheet is positioned below the thin film transistor array substrate. The light blocking layer covers at least the side of the back protective sheet. The light source faces the side of the front panel, the side of the thin film transistor array substrate and the side of the back protective sheet. The reflective display device can prevent light from transmitting in the back protection plate, so as to prevent the phenomenon of fading (fading) caused by light leakage of the thin film transistor element in the active area of the thin film transistor array substrate, thereby improving the display quality.)

1. A reflective display device, comprising:

a thin film transistor array substrate;

the front panel is positioned on the thin film transistor array substrate and is provided with a transparent conducting layer and a display medium layer, and the display medium layer is positioned between the transparent conducting layer and the thin film transistor array substrate;

a front protective sheet positioned on the front panel;

a back protection sheet positioned below the thin film transistor array substrate;

a light blocking layer covering at least a side of the back protective sheet; and

and the light source faces to the side surface of the front panel, the side surface of the thin film transistor array substrate and the side surface of the back protection sheet.

2. The reflective display device of claim 1, wherein the light blocking layer is a black, white, or silver ink.

3. The reflective display device of claim 1, wherein the light blocking layer is a black, white, or silver flake material.

4. The reflective display device of claim 1, wherein the light blocking layer covers sides of the front panel.

5. The reflective display device of claim 1, wherein the light blocking layer covers a side of the front protective sheet.

6. The reflective display device of claim 1, wherein the light blocking layer extends from a side of the rear protective sheet to a side of the front protective sheet.

7. The reflective display device of claim 1, wherein the height of the light blocking layer is substantially equal to the distance between the upper surface of the front protective sheet and the lower surface of the back protective sheet.

8. The reflective display device of claim 1, further comprising:

and the optical transparent adhesive is positioned between the thin film transistor array substrate and the back protection plate, and the light blocking layer covers the side surface of the optical transparent adhesive.

9. The reflective display device of claim 1, wherein the thin film transistor array substrate comprises a substrate and an active region, the active region being on the substrate.

10. The reflective display device of claim 9, further comprising:

and the sealant is positioned between the front protective sheet and the substrate of the thin film transistor array substrate.

11. The reflective display device of claim 10, wherein the light blocking layer covers sides of the sealant such that the sealant is between the light blocking layer and the front panel.

12. The reflective display device of claim 10, wherein the thin film transistor array substrate comprises a frame region and the sealant is between the frame region and the light blocking layer.

13. The reflective display device according to claim 10, wherein the thin film transistor array substrate comprises a frame region, and the frame region is located between the sealant and the active region.

14. The reflective display device of claim 1, further comprising:

and the front light module comprises a light guide plate, and the light guide plate is positioned above the front protection plate.

Technical Field

The invention relates to a reflective display device.

Background

In the market of various consumer electronic products, reflective display devices, such as electronic book display devices, are widely used as display screens of electronic products, and generally, the electronic book display devices have a Front panel (FP L) and a thin film transistor array (TFT array) substrate.

The electronic paper book display device can drive the white and black particles in the display medium layer by applying voltage to the display medium layer of the front panel, so that each pixel displays black, white or gray scale respectively. The electronic paper book display device achieves the purpose of display by irradiating the display medium layer by utilizing incident light, so that a backlight source is not needed.

In order to reduce the overall thickness of the electronic book display device, the light source as the front light may be provided on a side surface of the electronic book display device. However, the light emitted from the light source thus configured may partially enter from the side of the back protective sheet of the electronic book display device. The light entering from the side of the back protection sheet is transmitted in the transparent optical adhesive and the back protection sheet, and the light leakage of the thin film transistor element in the active region is caused by refraction, so that the phenomenon of fading (fading) is generated, and the display quality is influenced.

Disclosure of Invention

The present invention provides a reflective display device, which can prevent light from being transmitted in a back protection sheet, so as to prevent a color fading (fading) phenomenon from occurring due to light leakage of a thin film transistor element in an active region of a thin film transistor array substrate, thereby improving display quality.

According to one embodiment of the present invention, a reflective display device includes a thin film transistor array substrate, a front panel, a front protective sheet, a back protective sheet, a light blocking layer, and a light source. The front panel is positioned on the thin film transistor array substrate. The front panel has a transparent conductive layer and a display medium layer. The display medium layer is positioned between the transparent conducting layer and the thin film transistor array substrate. The front protective sheet is positioned on the front panel. The back protection sheet is positioned below the thin film transistor array substrate. The light blocking layer covers at least the side of the back protective sheet. The light source faces the side of the front panel, the side of the thin film transistor array substrate and the side of the back protective sheet.

In an embodiment of the invention, the light blocking layer is black, white or silver ink.

In an embodiment of the invention, the light blocking layer is a black, white or silver sheet material.

In an embodiment of the invention, the light blocking layer covers a side surface of the front panel.

In an embodiment of the present invention, the light blocking layer covers a side surface of the front protective sheet.

In one embodiment of the present invention, the light blocking layer extends from a side surface of the rear protective sheet to a side surface of the front protective sheet.

In an embodiment of the present invention, the height of the light blocking layer is substantially equal to the distance between the upper surface of the front protective sheet and the lower surface of the back protective sheet.

In an embodiment of the invention, the reflective display device further includes an optically transparent adhesive. The optical transparent adhesive is positioned between the thin film transistor array substrate and the back protection plate, and the light blocking layer covers the side face of the optical transparent adhesive.

In an embodiment of the present invention, the thin film transistor array substrate includes a substrate and an active region, and the active region is located on the substrate.

In an embodiment of the invention, the reflective display device further includes a sealant. The sealant is positioned between the front protective sheet and the substrate of the thin film transistor array substrate.

In an embodiment of the invention, the light blocking layer covers a side surface of the sealant, so that the sealant is located between the light blocking layer and the front panel.

In an embodiment of the invention, the thin film transistor array substrate includes a frame region, and the sealant is located between the frame region and the light blocking layer.

In an embodiment of the invention, the thin film transistor array substrate includes a frame region, and the frame region is located between the sealant and the active region.

In an embodiment of the invention, the reflective display device further includes a front light module having a light guide plate, and the light guide plate is located above the protective sheet.

In the above-described embodiment of the present invention, since the reflective display device includes the light blocking layer, and the light blocking layer covers at least the side surface of the back protective sheet, light does not enter the back protective sheet from the side surface of the back protective sheet when the light source emits light, and thus light can be prevented from being transmitted in the back protective sheet under the thin film transistor array substrate. Therefore, light can not enter the thin film transistor array substrate through the refraction of the back protection sheet, and the phenomenon of fading (fading) caused by light leakage of the thin film transistor element in the active area of the thin film transistor array substrate can be avoided, so that the display quality can be improved. In addition, since the light source faces the side of the front panel, the side of the thin film transistor array substrate, and the side of the back protective sheet, the thickness of the entire reflective display device can be reduced.

Drawings

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

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

FIG. 3 is a cross-sectional view of a reflective display device according to an embodiment of the invention, the cross-sectional view being the same as that of FIG. 2.

FIG. 4 is a cross-sectional view of a reflective display device according to an embodiment of the invention, the cross-sectional position of which is the same as that of FIG. 3.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a thorough understanding of various embodiments of the invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner.

FIG. 1 is a top view 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 of FIG. 1 along line 2-2. Referring to fig. 1 and 2, the reflective display device 100 includes a tft array substrate 110, a front panel 120, a front protective sheet 130a, a back protective sheet 130b, a light blocking layer 140, and a light source 150. The front panel 120 is positioned on a thin film transistor array (TFT array) substrate 110. The front panel 120 has a light transmissive film 122, a transparent conductive layer 123 and a display medium layer 124. The transparent conductive layer 123 is located on the lower surface of the light transmissive film 122. The display medium layer 124 is located between the transparent conductive layer 123 and the thin film transistor array substrate 110. The display medium layer 124 has a plurality of charged particles, such as black particles and white particles. The front protective sheet 130a is positioned on the front panel 120. The back protective sheet 130b is positioned under the thin film transistor array substrate 110. The light blocking layer 140 covers at least the side 132b of the back protective sheet 130 b. The light source 150 faces the side of the front panel 120, the side of the thin film transistor array substrate 110, and the side 132b of the back protective sheet 130 b. The light source 150 may be, for example, a light emitting diode, but is not limited to the invention.

In addition, the tft array substrate 110 includes a substrate 112, an Active area (Active area)114 and a frame area 116. The active region 114 is disposed on the substrate 112 and has a thin film transistor device. The active area 114 is a pixel area and a display area, and the frame area 116 surrounds the active area 114 and is a peripheral area for displaying only black or white.

When the light source 150 emits light (e.g., the light ray L1), since the reflective display device 100 includes the light blocking layer 140 covering the side 132b of the back protective sheet 130b, the light ray L1 does not enter the back protective sheet 130b from the side 132b of the back protective sheet 130b, and thus the light is prevented from being transmitted in the back protective sheet 130b under the tft array substrate 110, so as to form the light ray L2. as a result, the light ray L2 is not refracted by the back protective sheet 130b and enters the tft array substrate 110, which can prevent the tft elements in the active region 114 of the tft array substrate 110 from light leakage and fading (fading) and thus improve the display quality.

In this embodiment, the light blocking layer 140 may be black, white or silver ink directly applied to the side 132b of the back protective sheet 130 b. in other embodiments, the light blocking layer 140 may also be a black, white or silver sheet material applied to the side 132b of the back protective sheet 130b, depending on the needs of the designer, in addition, the reflective display device 100 further includes an Optically Clear Adhesive (OCA) 160. the optically clear adhesive 160 is located between the tft array substrate 110 and the back protective sheet 130 b. in this embodiment, the light blocking layer 140 further covers the side 162 of the optically clear adhesive 160 and the side 113 of the substrate 112 to prevent the light L1 from entering from the side 162 of the optically clear adhesive 160 and the side 113 of the substrate 112 to form the light ray L2. thus, no light ray L2 is refracted through the back adhesive 130b and the optically clear adhesive 160 to enter the tft array substrate 110, which can prevent the occurrence of fading (fading) and ensure display quality.

The reflective display device 100 further comprises a sealant 170. The sealant 170 is located between the front protective sheet 130a and the substrate 112 of the tft array substrate 110. The border region 116 is located between the sealant 170 and the active region 114.

In addition, in the present embodiment, the light blocking layer 140 does not extend to the side 172 of the sealant 170 and the side 132a of the front protective sheet 130a, that is, the side 172 of the sealant 170 and the side 132a of the front protective sheet 130a are exposed.

It should be understood that the connection and function of the elements described above will not be repeated, and will be described in detail. In the following description, other forms of reflective display devices will be described.

FIG. 3 is a cross-sectional view of a reflective display device 100a according to an embodiment of the invention, the cross-sectional view being the same as that of FIG. 2. The reflective display device 100a includes a tft array substrate 110, a front panel 120, a front protective sheet 130a, a back protective sheet 130b, a light blocking layer 140a, a light source 150, and a sealant 170. The difference from the embodiment of fig. 2 is that: the light blocking layer 140a extends from side 132b of the back protective sheet 130b to side 132a of the front protective sheet 130 a. That is, the light blocking layer 140a covers the side surface 172 of the sealant 170 and the side surface 132a of the front protective sheet 130a in addition to the side surface 132b of the back protective sheet 130b, the side surface 162 of the optically transparent adhesive 160, and the side surface 113 of the substrate 112. Accordingly, the side of the front panel 120 may also be covered by the light blocking layer 140 a.

In the present embodiment, the sealant 170 is located between the light blocking layer 140a and the front panel 120, and between the frame region 116 and the light blocking layer 140 a. The height of the light blocking layer 140a is substantially equal to the distance D between the upper surface 131a of the front protective sheet 130a and the lower surface 131b of the back protective sheet 130 b. Such a light blocking layer 140a is advantageous in terms of process, and may be coated on the entire sides of the back protective sheet 130b, the optically transparent adhesive 160, the thin film transistor array substrate 110, the front panel 120, and the front protective sheet 130a, for example, to facilitate construction.

In the present embodiment, the light blocking layer 140a extends from the side 132b of the back protective sheet 130b to the side 132a of the front protective sheet 130a, so as to prevent the light ray L1 from entering from the side 132b of the back protective sheet 130b, the side 162 of the optically transparent adhesive 160 and the side 113 of the substrate 112 to form the light ray L2. thus, no light ray L2 is refracted by the back protective sheet 130b and the optically transparent adhesive 160 to enter the thin film transistor array substrate 110, thereby preventing fading (fading) and ensuring display quality.

Fig. 4 is a cross-sectional view of a reflective display device 100b according to an embodiment of the invention, the cross-sectional position of which is the same as that of fig. 3. the reflective display device 100b includes a tft array substrate 110, a front panel 120, a front protective sheet 130a, a back protective sheet 130b, a light blocking layer 140a, a light source 150 and a sealant 170. the difference from the embodiment of fig. 3 is that the reflective display device 100b further includes a front light module 180. the front light module 180 includes a light guide plate 185 and a light source 150. the light guide plate 185 is located above the front protective sheet 130 a. when the light source 150 emits light (e.g., light L3), the light guide plate 185 can receive light L3 to provide the front panel 120 with front light, the light blocking layer 140a can prevent light L1 from entering from the side 132b of the back protective sheet 130b, the side 162 of the optically transparent adhesive 160 and the side 113 of the substrate 112 to form light L2. thus, no light L2 can enter the tft array substrate 110 through the refraction of the back protective sheet 130b and the optically transparent adhesive 160, thereby preventing fading phenomenon and ensuring display quality.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.