CN101699343B - Electrophoretic display pixel and display device - Google Patents
Electrophoretic display pixel and display device Download PDFInfo
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- CN101699343B CN101699343B CN2009102118878A CN200910211887A CN101699343B CN 101699343 B CN101699343 B CN 101699343B CN 2009102118878 A CN2009102118878 A CN 2009102118878A CN 200910211887 A CN200910211887 A CN 200910211887A CN 101699343 B CN101699343 B CN 101699343B
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- 239000000758 substrate Substances 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims description 45
- 239000011159 matrix material Substances 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 7
- 238000001962 electrophoresis Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 20
- 230000005684 electric field Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000000427 thin-film deposition Methods 0.000 description 1
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Abstract
The invention discloses an electrophoretic display pixel, which comprises an electrophoretic display film, a substrate, a first active element, a second active element, a first electrode and a second electrode. The substrate is arranged on the electrophoretic display film, and is provided with a transparent area and a non-transparent area. The first active element and the second active element are arranged on the substrate and are positioned in the non-transparent area. The first electrode is arranged on the substrate, is positioned in the transparent area and is electrically connected with the first active element, while the second electrode is arranged on the substrate, is positioned in the non-transparent area and is electrically connected with the second active element. A light ray penetrates through the transparent area and enters the electrophoretic display film for displaying. The invention also discloses a display device comprising the electrophoretic display pixel.
Description
Technical Field
The present invention relates to an electrophoretic display pixel and a display device, and more particularly, to an electrophoretic display pixel and a display device with high display contrast.
Background
While flat panel displays are being developed, the market has been a major goal in the future for displays that are lighter, thinner and flexible. Display technologies used in flexible displays, electronic paper, and electronic books of this type include liquid crystal display technology, electrophoretic display technology, and electrochromic technology.
The electrophoretic display comprises an active element array substrate and an electrophoretic display film attached on the active element array substrate. The electrophoretic display film has a display matrix and a plurality of display particles distributed in the display matrix. The display matrix is, for example, a display solution, and the display particles are particles having a positive or negative polarity. The active element array substrate comprises a plurality of pixel structures consisting of an active element and a pixel electrode.
The user is usually located near the electrophoretic display film and far from the active device array substrate, that is, one side of the active device array substrate is the non-display side, and the side where the electrophoretic display film is located is the display side. The display mode of the electrophoretic display is to input signals of different voltages to the pixel electrodes through the active elements on the active element array substrate, so that the electric field in the electrophoretic display film is changed to move the display particles. These display particles can reflect external light. Therefore, when these display particles move toward the display side, the color of the particles is displayed, and when the display particles move away from the display side, the color of the display matrix is displayed.
Disclosure of Invention
The invention provides an electrophoretic display pixel with high display contrast.
The invention provides a display device having a plurality of electrophoretic display pixels with high display contrast.
The invention provides an electrophoretic display pixel, which comprises an electrophoretic display film, a substrate, a first active element, a second active element, a first electrode and a second electrode. The substrate is arranged on the electrophoresis display film and is provided with a light-transmitting area and a non-light-transmitting area. The first active device and the second active device are both disposed on the substrate and located in the non-light-transmitting region. The first electrode is disposed on the substrate and located in the transparent region and electrically connected to the first active device, and the second electrode is disposed on the substrate and located in the non-transparent region and electrically connected to the second active device. A light ray penetrates through the light-transmitting area and enters the electrophoretic display film for displaying.
In an embodiment of the invention, the first active device and the second active device respectively include a gate, a source and a drain. The source and the drain are respectively positioned at two sides of the grid, the first electrode is electrically connected with the drain of the first active component, and the second electrode is electrically connected with the drain of the second active component. The gate, the source and the drain are made of a non-transparent conductive material, for example. In addition, the electrophoretic display pixel further comprises a capacitor electrode which is arranged on the substrate and is positioned in the non-light-transmitting area. The material of the capacitor electrode is also a non-transparent conductive material, for example.
In an embodiment of the invention, the electrophoretic display pixel further includes two scan lines and a data line, the first active device and the second active device are respectively electrically connected to one of the scan lines, and the first active device and the second active device are electrically connected to the data line.
In an embodiment of the invention, the electrophoretic display pixel further includes a scan line and two data lines, the first active device and the second active device are electrically connected to the scan line, and the first active device and the second active device are respectively electrically connected to one of the data lines.
In an embodiment of the invention, the electrophoretic display film includes an electrode layer, a display matrix, and a plurality of display particles. The display particles are distributed in the display matrix, and the electrode layer and the active element substrate are positioned at two opposite sides of the display matrix. The display particles are located in the transparent region or the non-transparent region, for example, controlled by the polarities of the first electrode and the second electrode.
The invention further provides a display device comprising a plurality of electrophoretic display pixels.
In an embodiment of the invention, the display device includes an electronic paper display and a flexible display panel.
In view of the above, the present invention disposes the active device on the display side, so that the electrophoretic display pixel has a light-opaque device on the display side. When the electrophoretic display pixel displays a black image, the display particles can be located under the opaque element and shielded to improve the display contrast. Therefore, the electrophoretic display pixel and the display device of the invention have excellent display effect, namely, the display contrast is quite good.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to make the aforementioned and other objects, features, advantages and embodiments of the invention more comprehensible, the following description is given with reference to the accompanying drawings:
FIG. 1 is a schematic top view of an electrophoretic display pixel according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of the EPD pixel of FIG. 1 along line A-A';
FIGS. 3A-3C are schematic diagrams illustrating three states of the electrophoretic display pixel shown in FIGS. 1 and 2;
fig. 4 is a schematic top view illustrating a part of components of an electrophoretic display pixel according to another embodiment of the invention.
Wherein the reference numerals
100. 200: electrophoretic display pixel 110: electrophoretic display film
112: electrode layer 114: display substrate
116: display particles 118: light absorbing layer
120: substrate 122: light-transmitting region
124: non-light-transmitting region 130: a first active element
150: first electrode 140: second active element
170: capacitance electrode 160: second electrode
190. 292, 294: data lines 182, 184, 280: scanning line
A-A': cutting a line D: drain electrode
G: and a grid S: source electrode
I. II, III: and a state L: light ray
Detailed Description
Fig. 1 is a schematic top view of an electrophoretic display pixel according to an embodiment of the invention, and fig. 2 is a schematic cross-sectional view of the electrophoretic display pixel of fig. 1 along a sectional line a-a'. Referring to fig. 1 and fig. 2, the electrophoretic display pixel 100 includes an electrophoretic display film 110, a substrate 120, a first active device 130, a second active device 140, a first electrode 150, and a second electrode 160. The substrate 120 is disposed on the electrophoretic display film 110 and has a transparent region 122 and a non-transparent region 124. The first active device 130 and the second active device 140 are disposed on the substrate 120 and located in the non-light-transmitting region 124. The first electrode 150 is disposed on the substrate 120, located in the transparent region 122, and electrically connected to the first active device 130, and the second electrode 160 is disposed on the substrate 120, located in the non-transparent region 124, and electrically connected to the second active device 140.
Specifically, the electrophoretic display film 110 includes an electrode layer 112, a display matrix 114, and a plurality of display particles 116. The display particles 116 are distributed in the display matrix 114, and the electrode layer 112 and the substrate 120 are located on opposite sides of the display matrix 114. In the present embodiment, the light L penetrates through the transparent region 122, enters the electrophoretic display film 110, and is reflected out for displaying, so that the side of the substrate 120 is the display side.
In other words, when the user uses the electronic device with the electrophoretic display pixel 100, the user is located at a side where the light L is located, and the user views the image along the incident direction of the light L. Therefore, the material of the first electrode 150 and the second electrode 160 is, for example, a transparent conductive material. To improve the display quality, the electrophoretic display pixel 100 further includes a light absorbing layer 118 disposed on a side of the electrophoretic display film 110 away from the substrate 120.
Fig. 3A to 3C are schematic diagrams illustrating three states of the electrophoretic display pixel shown in fig. 1 and 2, wherein fig. 3A to 3C only schematically illustrate the display film, the first electrode and the second electrode. Referring to fig. 3A to 3C, the display particles 116 are generally particles with positive or negative charges, so the movement of the display particles 116 can be controlled by the electric fields of the electrode layer 112, the first electrode 150 and the second electrode 160, for example.
In state I, assuming the display particles 116 are positively charged, the electrode layer 112 is applied with a negative voltage, and the first electrode 150 and the second electrode 160 are applied with a positive voltage, as shown in fig. 3A. Therefore, the display particles 116 move toward the electrode layer 112 and approach the surface of the electrode layer 112 according to the direction and distribution of the electric field. At this time, the light L first passes through the display matrix 114 and then is reflected by the display particles 116. In state I, the electrophoretic display pixel 100 is seen to appear in the color of the display matrix 114 when viewed by a user along the incident direction of the light L. If the display matrix 114 is red, the electrophoretic display pixel 100 displays a red frame in state I. Of course, the color of the display substrate 114 may vary with different designs.
In state II, assuming the display particles 116 are positively charged, the electrode layer 112 is applied with a positive voltage, and the first electrode 150 and the second electrode 160 are applied with a negative voltage, as shown in fig. 3B. Therefore, depending on the direction and distribution of the electric field, the display particles 116 move toward the surfaces of the first electrode 150 and the second electrode 160. At this time, the light L is directly reflected by the display particles 116 to display the color of the display particles 116. If the display particles 116 are white, in state II, the user can see that the electrophoretic display pixel 100 displays a white image when looking along the incident direction of the light L. Similarly, the electrophoretic display pixel 100 displays different colors of the image in state II according to the color of the display particles 116. In other words, in state II, the user will see the color of the display particles 116.
In state III, assuming the display particles 116 are positively charged, the electrode layer 112 and the first electrode 150 are applied with a positive voltage, while only the second electrode 160 is applied with a negative voltage, as shown in fig. 3C. Depending on the direction and distribution of the electric field, the positively charged display particles 116 move to the area where the second electrode 160 is located. That is, the display particles 116 of the present embodiment can perform longitudinal displacement, and can also control the lateral displacement of the display particles 116 through the electric field variation of the first electrode 150 and the second electrode 160.
As can be seen from fig. 1, fig. 2 and fig. 3A to fig. 3C, the second electrode 160 is located in the non-light-transmitting region 124, so that the light L is not reflected by the display particles 116 and absorbed by the light absorbing layer 118 in the state III shown in fig. 3C. Therefore, when a user looks from one side of the substrate 120 toward the electrophoretic display film 110, the light L is not reflected and the electrophoretic display pixel 100 can be seen to present a black image. It should be noted that the second electrode 160 of the present embodiment is not transparent, so that the light L is not easily incident to the display particles 116 and is not easily reflected in the state III shown in fig. 3C. As a result, the electrophoretic display pixel 100 is not prone to generate the reflected light when displaying the black image, and can display a black image. By such a design, the electrophoretic display pixel 100 has a relatively high display contrast.
Specifically, referring to fig. 1 and fig. 2, the electrophoretic display pixel 100 further includes two scan lines 182 and 184 and a data line 190. The first active device 130 is electrically connected to the scan line 182, the second active device 140 is electrically connected to the scan line 184, and the first active device 130 and the second active device 140 are electrically connected to the same data line 190. The first active device 130 and the second active device 140 of the present embodiment are respectively connected to the scan line 182 and the scan line 184. Therefore, the first electrode 150 and the second electrode 160 may have different voltages to control the lateral displacement of the display particles 116.
In the present embodiment, the first active device 130 and the second active device 140 respectively include a gate G, a source S and a drain D. The source S and the drain D are respectively located at two sides of the gate G, and the first electrode 150 is electrically connected to the drain D of the first active device 130, and the second electrode 160 is electrically connected to the drain D of the second active device 140. The first active device 130 and the second active device 140 are substantially thin film transistors. The gate G, the source S and the drain D are made of a non-transparent conductive material, for example.
In addition, the electrophoretic display pixel 100 further includes a capacitor electrode 170 disposed on the substrate 120 and located in the non-transmissive region 124. The drain D of the first active device 130 and the drain D of the second active device 140 are respectively overlapped with the capacitor electrode 170 to form corresponding storage capacitors. The design of the storage capacitor helps to maintain the display stability of the electrophoretic display pixel 100. In addition, the material of the capacitor electrode 170 is also a non-transparent conductive material, for example.
The scan lines 182, 184, the data line 190, the first active device 130, the second active device 140, and the capacitor electrode 170 are opaque elements. Therefore, the opaque region 124 of the present embodiment is defined by the positions of the opaque elements. The opaque elements are disposed on the display side (i.e., the side of the substrate 120 that is close to the user). Therefore, the electrophoretic display pixel 100 of the present embodiment can block unnecessary light leakage or block the light L from being reflected by the display particles 116 in the non-transparent region 124 by the opaque elements, thereby improving the display contrast of the electrophoretic display pixel 100.
Furthermore, the electrophoretic display pixel 100 of the embodiment can effectively improve the display quality without an additional light-shielding element. Therefore, the electrophoretic display pixel 100 of the present embodiment can be manufactured by using an existing process, and the process steps are not complicated. In addition, the invention is not limited to what kind of devices are located in the non-light-transmitting region 124, and the devices may include thin film transistor devices, storage capacitors, and the like, which at least include a non-light-transmitting layer to block or reduce the transmission of light.
In detail, the electrophoretic display pixel 100 is manufactured by, for example, first forming the scan lines 182 and 184, the data line 190, the first active device 130, the second active device 140, the first electrode 150, the second electrode 160, and the capacitor electrode 170 on the substrate 120 by a thin film deposition process and a photolithography process, which are applicable to the active device array. Then, the side of the substrate 120 on which the above-mentioned elements are disposed is assembled or attached to the electrophoretic display film 110. In other words, the electrophoretic display pixel 100 is fabricated in substantially the same manner as a conventional electrophoretic display.
Since the components of the electrophoretic display pixel 100 are the same as those of the conventional electrophoretic display, the design of the present embodiment can achieve high display contrast without changing the components. Therefore, the design of the present embodiment does not complicate the process or increase the cost of the process. Here, the electrophoretic display pixel 100 may be applied to, for example, an electronic paper display or a flexible display.
Fig. 4 is a schematic top view of a part of the components of an electrophoretic display pixel according to another embodiment of the invention, in which the electrophoretic display film and the substrate are omitted in fig. 4. Referring to fig. 4, in another electrophoretic display pixel 200, the first active device 130 and the second active device 140 are driven by a scan line 280 and two data lines 292 and 294. The first active device 130 and the second active device 140 are electrically connected to the same scan line 280. In addition, the first active device 130 is electrically connected to the data line 292, and the second active device 140 is electrically connected to the data line 294.
In the present embodiment, the corresponding signals are transmitted to the first electrode 150 and the second electrode 160 through different data lines 292 and 294. Therefore, the polarities of the first electrode 150 and the second electrode 160 are determined by independent signals to control the moving direction and position of the display particles (not shown) in the display film (not shown). In addition, in the design of the present embodiment and the previous embodiments, the positions of the opaque elements such as the first active device 130, the second active device 140, the capacitor electrode 170, etc. are defined as the opaque regions. And, the second electrodes 160 are all located in the non-light-transmitting regions. Therefore, when displaying a black image, it is not easy to reflect light by attracting the display particles (not shown) to the position of the second electrode 160. That is, the electrophoretic display pixel 200 may display a black image with a high display contrast.
Similarly, the design of this embodiment is primarily to place the opaque element near the display side of the user. Therefore, when the electrophoretic display pixel 200 of the present embodiment displays a black image, the display particles (not shown) can be shielded by using the existing opaque element. In this way, the black frame displayed by the electrophoretic display pixel 200 is sufficiently black to achieve the display effect of high display contrast.
In summary, the substrate on which the active device is disposed is set as the display side in the present invention. Therefore, the non-transparent region can be defined on the substrate by the device having opaque property such as active device and capacitor electrode. The invention respectively arranges the first electrode and the second electrode in the light-transmitting area and the non-light-transmitting area to control the transverse movement of the display particles. When the display particles move transversely to the area where the second electrode is located, the display particles are shielded by the opaque element and cannot reflect light, so that a black picture can be displayed. Therefore, the electrophoretic display pixel and the display device of the invention have relatively good display contrast. Under the design, the components and the manufacturing method of the electrophoretic display pixel do not need to be changed greatly, that is, the invention can achieve the display effect of high display contrast under the existing component design.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. An electrophoretic display pixel, comprising:
an electrophoretic display film;
a substrate, disposed on the electrophoretic display film, located at the display side of the electrophoretic display pixel, and having a transparent region and a non-transparent region;
a first active element disposed on the substrate and located in the non-light-transmitting region;
a second active element disposed on the substrate and located in the non-light-transmitting region;
a first electrode disposed on the substrate, located in the light-transmitting region, and electrically connected to the first active element; and
a second electrode disposed on the substrate and located in the non-light-transmitting region and electrically connected to the second active device;
a light ray penetrates through the light-transmitting area and enters the electrophoresis display film for displaying; wherein,
the first active device and the second active device respectively include a gate, a source and a drain, the source and the drain are respectively located at two sides of the gate, and the first electrode is electrically connected to the drain of the first active device, and the second electrode is electrically connected to the drain of the second active device.
2. An electrophoretic display pixel as claimed in claim 1, wherein the gate electrode, the source electrode and the drain electrode are made of a non-transparent conductive material.
3. The electrophoretic display pixel of claim 1, further comprising a capacitive electrode disposed on the substrate and in the opaque region.
4. The electrophoretic display pixel of claim 3, wherein the drain of the first active device and the drain of the second active device overlap the capacitor electrode, respectively.
5. An electrophoretic display pixel as claimed in claim 3, wherein the capacitor electrode is made of a non-transparent conductive material.
6. The electrophoretic display pixel of claim 1, further comprising two scan lines and a data line, wherein the first active device and the second active device are electrically connected to one of the scan lines respectively, and the first active device and the second active device are electrically connected to the data line.
7. The electrophoretic display pixel of claim 1, further comprising a scan line and two data lines, wherein the first active device and the second active device are electrically connected to the scan line, and wherein the first active device and the second active device are respectively electrically connected to one of the data lines.
8. The electrophoretic display pixel of claim 1, further comprising a light absorbing layer disposed on a side of the electrophoretic display film remote from the substrate.
9. The electrophoretic display pixel of claim 1, wherein the electrophoretic display film comprises an electrode layer, a display matrix, and a plurality of display particles, the display particles are distributed in the display matrix, and the electrode layer and the substrate are located on opposite sides of the display matrix.
10. The electrophoretic display pixel of claim 9, wherein the display particles are located in the transparent region or the non-transparent region by polarity control of the first electrode and the second electrode.
11. A display device comprising a plurality of electrophoretic display pixels according to claim 1.
12. The display device of claim 11, wherein the display device comprises an electronic paper display or a flexible display panel.
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| CN2009102118878A CN101699343B (en) | 2009-11-09 | 2009-11-09 | Electrophoretic display pixel and display device |
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| CN2009102118878A CN101699343B (en) | 2009-11-09 | 2009-11-09 | Electrophoretic display pixel and display device |
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| CN101699343A CN101699343A (en) | 2010-04-28 |
| CN101699343B true CN101699343B (en) | 2012-01-25 |
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| CN118591765A (en) * | 2023-01-03 | 2024-09-03 | 京东方科技集团股份有限公司 | Reflective display panel, manufacturing method thereof, driving method thereof and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908794A (en) * | 2005-08-01 | 2007-02-07 | Nec液晶技术株式会社 | Color electronic paper display device |
| CN101093335A (en) * | 2006-06-22 | 2007-12-26 | 三星电子株式会社 | Electrophoretic display and manufacturing method thereof |
| CN101169567A (en) * | 2006-10-25 | 2008-04-30 | 精工爱普生株式会社 | Electro-optical device and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908794A (en) * | 2005-08-01 | 2007-02-07 | Nec液晶技术株式会社 | Color electronic paper display device |
| CN101093335A (en) * | 2006-06-22 | 2007-12-26 | 三星电子株式会社 | Electrophoretic display and manufacturing method thereof |
| CN101169567A (en) * | 2006-10-25 | 2008-04-30 | 精工爱普生株式会社 | Electro-optical device and electronic apparatus |
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