CN111435211B - Reflective display device - Google Patents
Reflective display device Download PDFInfo
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- CN111435211B CN111435211B CN201910025212.8A CN201910025212A CN111435211B CN 111435211 B CN111435211 B CN 111435211B CN 201910025212 A CN201910025212 A CN 201910025212A CN 111435211 B CN111435211 B CN 111435211B
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- display device
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- film transistor
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Abstract
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 is provided with 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 protection 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 face of the front panel, the side face of the thin film transistor array substrate and the side face of the back protection sheet. The reflective display device can avoid light transmission in the back protective sheet so as to avoid the phenomena of light leakage and fading (fading) of the thin film transistor element in the active area of the thin film transistor array substrate, thereby improving the display quality.
Description
Technical Field
The invention relates to a reflective display device.
Background
In the market of various consumer electronic products nowadays, reflective display devices have been widely used as display screens of electronic products, such as electronic paper book display devices. In general, an electronic book display device has a front panel (Front panel laminate; FPL) and a thin film transistor array (TFT array) substrate.
The electronic book display device can drive 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 respectively displays black, white or gray scale. The electronic book display device irradiates the display medium layer with incident light to achieve the purpose of display, so that a backlight source is not needed.
In order to reduce the overall thickness of the electronic book display device, a light source as a front light may be provided on a side surface of the electronic book display device. However, some of the light emitted from the light source thus configured may enter from the side of the back protection sheet of the electronic book display device. Light entering from the side surface of the back protection sheet is transmitted in the transparent optical adhesive and the back protection sheet, and light leakage of the thin film transistor element of the active region is caused by refraction, so that the phenomenon of fading (fading) is generated, and the display quality is affected.
Disclosure of Invention
The present invention provides a reflective display device, which can prevent light from being transmitted in a back protective sheet, so as to prevent light leakage of a thin film transistor element in an active region of a thin film transistor array substrate and color fading (fading) of the thin film transistor element, 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 is provided with a transparent conductive layer and a display medium layer. The display medium layer is positioned between the transparent conductive layer and the thin film transistor array substrate. The front protection 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 face of the front panel, the side face of the thin film transistor array substrate and the side face of the back protection 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 one embodiment of the present invention, the light blocking layer covers a side surface of the front panel.
In one 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 back protective sheet to a side surface of the front protective sheet.
In an embodiment of the invention, the height of the light blocking layer is approximately equal to a 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 optically transparent adhesive is positioned between the thin film transistor array substrate and the back protection sheet, and the light blocking layer covers the side surface of the optically transparent adhesive.
In an embodiment of the invention, the tft 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 protection 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 area, and the frame area is located between the sealant and the active area.
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 protection sheet.
In the above 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 is prevented from being transmitted in the back protective sheet under the thin film transistor array substrate. Therefore, light does not enter the thin film transistor array substrate through refraction of the back protection sheet, light leakage of the thin film transistor element in the active area of the thin film transistor array substrate can be avoided, and the phenomenon of fading (fading) can be avoided, so that the display quality can be improved. In addition, the thickness of the whole reflective display device can be reduced due to the side surface of the light source facing the front panel, the side surface of the thin film transistor array substrate and the side surface of the back protection sheet.
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, and the cross-sectional position is 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, and the cross-sectional position is the same as that of fig. 3.
Detailed Description
In the following, various embodiments of the present invention will be disclosed with reference to the accompanying drawings, and for the purposes of clarity, numerous practical details will be described in the following description. However, it should be understood that these practical details are not to be taken as limiting the invention. That is, in some embodiments of the invention, these practical details are unnecessary. Furthermore, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified 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 thin film transistor 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-transmitting 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-transmitting 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 present invention.
In addition, the tft array substrate 110 includes a substrate 112, an Active area 114 and a frame area 116. The active region 114 is located on the substrate 112 and has thin film transistor devices. The active region 114 is a pixel region, a display region, and a frame region 116 surrounds the active region 114 and is a surrounding region for displaying only full black or full white.
When the light source 150 emits light (e.g., light 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 L1 does not enter the back protective sheet 130b from the side 132b of the back protective sheet 130b, and thus light is prevented from being transmitted in the back protective sheet 130b under the thin film transistor array substrate 110, forming light L2. In this way, the light L2 does not enter the tft array substrate 110 by being refracted by the back protective sheet 130b, so that the phenomena of light leakage and color fading (fading) of the tft element in the active region 114 of the tft array substrate 110 can be avoided, and the display quality can be improved. In addition, since 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 130b, the thickness of the entire reflective display device 100 can be reduced.
In the present embodiment, the light blocking layer 140 may be black, white, or silver ink, which is directly coated on the side 132b of the back protective sheet 130 b. In other embodiments, the light blocking layer 140 may be a black, white or silver sheet material attached to the side 132b of the back protection sheet 130b according to the requirements of the designer. In addition, the reflective display device 100 further includes an optically clear adhesive (Optical clear adhesive; OCA) 160. The optically transparent adhesive 160 is located between the thin film transistor array substrate 110 and the back protective sheet 130 b. In the present embodiment, the light blocking layer 140 further covers the side 162 of the optically transparent adhesive 160 and the side 113 of the substrate 112, so as to prevent the light L1 from entering from the side 162 of the optically transparent adhesive 160 and the side 113 of the substrate 112 to form the light L2. In this way, the light L2 does not enter the tft array substrate 110 by being refracted by the back protective sheet 130b and the transparent adhesive 160, so as to avoid color fading (fading) and ensure display quality. In the present embodiment, the light blocking layer 140 may be directly formed or contacted with 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, but is not limited thereto.
The reflective display device 100 also includes a sealant 170. The sealant 170 is located between the front protective sheet 130a and the substrate 112 of the thin film transistor array substrate 110. The border region 116 is located between the encapsulant 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 relationships and functions of the elements already described 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, and the cross-sectional position is the same as that of fig. 2. The reflective display device 100a includes a thin film transistor 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 embodiment of fig. 2 differs in that: 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 130 a. That is, the light blocking layer 140a covers 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, and also covers the side surface 172 of the sealant 170 and the side surface 132a of the front protective sheet 130 a. Therefore, the side of the front panel 120 is also 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 bezel area 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 applied to the entire side surfaces 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 the 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 that the light L1 is prevented 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 L2. In this way, the light L2 does not enter the tft array substrate 110 by being refracted by the back protective sheet 130b and the transparent adhesive 160, so as to avoid color fading (fading) and ensure display quality. In the present embodiment, the light blocking layer 140a may be directly coated or contacted to the side 132b of the back protective sheet 130b, the side 162 of the optically transparent adhesive 160, the side 113 of the substrate 112, the side 172 of the sealant 170, and the side 132a of the front protective sheet 130a, but is not limited thereto.
Fig. 4 is a cross-sectional view of a reflective display device 100b according to an embodiment of the invention, and the cross-sectional position is the same as that of fig. 3. The reflective display device 100b includes a thin film transistor 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 embodiment of fig. 3 differs in 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 positioned 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 the light L3, thereby providing the front panel 120 with front light. The light blocking layer 140a can prevent the 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 the light L2. In this way, the light L2 does not enter the tft array substrate 110 by being refracted by the back protective sheet 130b and the transparent adhesive 160, so as to avoid color fading (fading) and ensure display quality.
While the present invention has been described with reference to the embodiments, it should be understood that the invention is not limited thereto, but may be modified and altered in various ways without departing from the spirit and scope of the present invention.
Claims (14)
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 conductive layer and a display medium layer, and the display medium layer is positioned between the transparent conductive layer and the thin film transistor array substrate;
a front protective sheet on the front panel;
the back protection sheet is positioned below the thin film transistor array substrate;
a light blocking layer covering at least a side surface of the back protective sheet; and
and a light source facing 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 black, white, or silver ink.
3. The reflective display device of claim 1, wherein the light blocking layer is a black, white, or silver sheet material.
4. The reflective display device of claim 1, wherein the light blocking layer covers a side 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 back protective sheet to a side of the front protective sheet.
7. The reflective display device of claim 1, wherein a height of the light blocking layer is equal to a distance between an upper surface of the front protective sheet and a 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 sheet, 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 located on the substrate.
10. The reflective display device of claim 9, further comprising:
and the sealant is positioned between the front protection 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 a side of the encapsulant such that the encapsulant is located 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 border region, and the sealant is located between the border region and the light blocking layer.
13. The reflective display device of claim 10, wherein the thin film transistor array substrate comprises a border region, and the border region is between the sealant and the active region.
14. The reflective display device of claim 1, further comprising:
the front light module comprises a light guide plate, and the light guide plate is positioned above the front protection sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910025212.8A CN111435211B (en) | 2019-01-11 | 2019-01-11 | Reflective display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910025212.8A CN111435211B (en) | 2019-01-11 | 2019-01-11 | Reflective display device |
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| Publication Number | Publication Date |
|---|---|
| CN111435211A CN111435211A (en) | 2020-07-21 |
| CN111435211B true CN111435211B (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910025212.8A Active CN111435211B (en) | 2019-01-11 | 2019-01-11 | Reflective display device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418882A (en) * | 2011-08-15 | 2012-04-18 | 友达光电股份有限公司 | Backlight module capable of reducing light leakage and display device |
| CN102799018A (en) * | 2012-08-09 | 2012-11-28 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and manufacturing method thereof |
| CN202675079U (en) * | 2012-07-10 | 2013-01-16 | 威皇股份有限公司 | Edge-type light emitting diode (LED) backlight module |
| CN107765480A (en) * | 2016-08-19 | 2018-03-06 | 三星显示有限公司 | Display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9612492B2 (en) * | 2013-11-26 | 2017-04-04 | Apple Inc. | Border masking structures for liquid crystal display |
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2019
- 2019-01-11 CN CN201910025212.8A patent/CN111435211B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418882A (en) * | 2011-08-15 | 2012-04-18 | 友达光电股份有限公司 | Backlight module capable of reducing light leakage and display device |
| CN202675079U (en) * | 2012-07-10 | 2013-01-16 | 威皇股份有限公司 | Edge-type light emitting diode (LED) backlight module |
| CN102799018A (en) * | 2012-08-09 | 2012-11-28 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and manufacturing method thereof |
| CN107765480A (en) * | 2016-08-19 | 2018-03-06 | 三星显示有限公司 | Display device |
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| CN111435211A (en) | 2020-07-21 |
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