CN101710220A - Electrophoretic display panel - Google Patents

Abstract

The invention discloses an electrophoretic display panel which comprises an active element array substrate and an electrophoretic display film. The active element array substrate is provided with a plurality of active components and a light shield layer shielding the active elements. The electrophoretic display film is configured on the active element array substrate and comprises a conducting layer, a dielectric layer and a plurality of electrophoretic display media. The dielectric layer is configured on the conducting layer and is provided with a plurality of microcups which are distributed in an array, the dielectric layer is positioned between the conducting layer and the active element array substrate, and the light shield layer prevents light penetrating the dielectric layer from irradiating the active elements. In addition, the electrophoretic display media are configured in the microcups.

Description

Electrophoretic display panel

technical field

The present invention relates to an electrophoresis display panel, and in particular to an electrophoresis display panel with a light-shielding layer.

Background technique

In recent years, due to the continuous vigorous development of various display technologies, after continuous research and development, products such as electrophoretic displays, liquid crystal displays, plasma displays, organic light-emitting diode displays, etc., have been gradually commercialized and applied to various sizes and Display devices of various sizes. With the increasing popularity of portable electronic products, flexible displays (such as electronic paper (e-paper), electronic book (e-book), etc.) have gradually attracted the attention of the market. Generally speaking, electronic paper (e-paper) and electronic book (e-book) use electrophoretic display technology to achieve the purpose of display. Taking an e-book as an example, its sub-pixels are mainly composed of electrophoretic fluids of different colors (such as red, green, blue, etc.) and white charged particles doped in the electrophoretic fluid, and the white charged particles can be driven by applying a voltage. The particles move so that each pixel displays black, white, red, green, blue, or different shades of color.

In the prior art, most electrophoretic displays use the reflection of external light sources to achieve the purpose of display. The white charged particles in the electrophoretic fluid can make each sub-pixel display the desired gray scale. Generally speaking, an electrophoretic display is mainly composed of a thin film transistor array substrate and an electrophoretic display film, and the dielectric layer used to define micro-cups in the electrophoretic display film is made of a light-transmitting material. After the external light source passes through the dielectric layer in the electrophoretic display film, it will irradiate the thin film transistors on the thin film transistor array substrate, causing the thin film transistors to generate photocurrent and affecting the device characteristics, thereby resulting in poor display quality of the electrophoretic display. Based on the above, how to reduce the photocurrent problem caused by the external light source has become one of the problems to be solved urgently in this field.

Contents of the invention

The invention provides an electrophoretic display panel, which has a light-shielding layer to effectively reduce the photo current (photo current) generated by the active device after being irradiated by light.

The invention provides an electrophoretic display panel, which includes an active element array substrate and an electrophoretic display film. The active device array substrate includes a plurality of active devices and a light shielding layer. The electrophoretic display film is arranged on the active element array substrate, and the electrophoretic display film includes a conductive layer, a dielectric layer and a plurality of electrophoretic display media. The dielectric layer is disposed on the conductive layer. The dielectric layer has a plurality of microcups arranged in an array. The dielectric layer is located between the conductive layer and the active element array substrate, and the light-shielding layer is located between the dielectric layer and the active element. In addition, the electrophoretic display medium is arranged in the microcup.

In an embodiment of the present invention, each of the aforementioned microcups is a polygonal cylindrical space, an elliptical cylindrical space, or a cylindrical space.

In an embodiment of the present invention, the aforementioned electrophoretic display medium is electrically insulated from the conductive layer, and is not in direct contact with the conductive layer.

In an embodiment of the present invention, each of the aforementioned electrophoretic display media includes an electrophoretic fluid and a plurality of charged particles doped in the electrophoretic fluid.

In an embodiment of the present invention, the aforementioned electrophoretic fluid is a black electrophoretic fluid, and the charged particles are white charged particles.

In an embodiment of the present invention, the aforementioned active device array substrate may further include a substrate, a plurality of scan lines and a plurality of data lines, and the scan lines and data lines are disposed on the substrate. The active element is arranged on the substrate, and is electrically connected to the corresponding scanning line and data line respectively, and the active element and the light-shielding layer form a plurality of pixels, and the light-shielding layer includes a plurality of reflective pixel electrodes, and is electrically connected to the active element .

In an embodiment of the present invention, the aforementioned active device array substrate may further include a substrate, a plurality of scan lines, a plurality of data lines, and a plurality of pixel electrodes, and the scan lines and data lines are disposed on the substrate. The active element is arranged on the substrate and is electrically connected with the corresponding scanning line, data line and pixel electrode, and the aforementioned active element and pixel electrode constitute a plurality of pixels, and the light-shielding layer is located between the pixel electrode and the active element.

The invention provides an electrophoretic display panel, which includes an active element array substrate and an electrophoretic display film. The active element array substrate includes a substrate, a plurality of scanning lines arranged on the substrate, a plurality of data lines arranged on the substrate, a plurality of active elements arranged on the substrate and a light shielding layer located in the display area. The electrophoretic display film is arranged on the active element array substrate, and the electrophoretic display film includes a conductive layer, a dielectric layer and a plurality of electrophoretic display media. The dielectric layer is disposed on the conductive layer, the dielectric layer has a plurality of microcups arranged in an array, and the dielectric layer is located between the conductive layer and the active element array substrate, and the light-shielding layer generally shields at least one of the active elements . In addition, the electrophoretic display medium is arranged in the microcup.

In an embodiment of the invention, the aforementioned dielectric layer is substantially transparent.

In an embodiment of the present invention, the aforementioned active device and the light-shielding layer constitute a plurality of pixels, and the light-shielding layer includes a plurality of reflective pixel electrodes and is electrically connected to the active device.

In an embodiment of the present invention, the aforementioned active device and the pixel electrode constitute a plurality of pixels, and the light shielding layer is located between the pixel electrode and the active device.

The invention provides an electrophoretic display panel, which includes an active element array substrate and an electrophoretic display film. The active device array substrate includes a plurality of active devices and a light-shielding layer, wherein the light-shielding layer is located in a display area and generally shields at least one of the active devices. The electrophoretic display film is configured on the active element array substrate.

Based on the above, since the electrophoretic display panel of the present invention uses a light-shielding layer to reduce the light leakage current generated by the active device after being irradiated by light, the electrophoretic display panel of the present invention has better display quality.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

1 is a schematic cross-sectional view of an electrophoretic display panel according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an electrophoretic display panel according to a second embodiment of the present invention.

Among them, reference signs

100, 100': Electrophoretic display panel 110, 110': Active element array substrate

112: Active components 114: Shading layer

120: Electrophoretic display film 122: Conductive layer

124: Dielectric layer 124a: Microcup

126: Electrophoretic display medium 126a: Electrophoretic fluid

126b: charged particles D1, D2: size

PE: pixel electrode

Detailed ways

【The first embodiment】

FIG. 1 is a schematic cross-sectional view of an electrophoretic display panel according to a first embodiment of the present invention. Referring to FIG. 1 , the electrophoretic display panel 100 of this embodiment includes an active device array substrate 110 and an electrophoretic display film 120 . The active device array substrate 110 includes a plurality of active devices 112 and a light shielding layer 114 covering the active devices 112 . The electrophoretic display film 120 is disposed on the active device array substrate 110 , and the electrophoretic display film 120 includes a conductive layer 122 , a dielectric layer 124 and a plurality of electrophoretic display media 126 . As shown in Figure 1, the dielectric layer 124 is configured on the lower surface of the conductive layer 122, the dielectric layer 124 has a plurality of microcups 124a arranged in an array and located on its lower surface, and the dielectric layer 124 is located between the conductive layer 122 and Between the active device array substrates 110 , and for example, the light shielding layer 114 is located between the dielectric layer 124 and the active device 112 , so as to prevent the light passing through the dielectric layer 124 from irradiating the active device 112 . From another perspective, part of the light-shielding layer 114 is distributed in the display area of the electrophoretic display panel 100 . In addition, the electrophoretic display medium 126 is disposed in the microcup 124a. Each microcup 124a in this embodiment is, for example, a polygonal cylinder space, an elliptical cylinder space, or a cylinder space.

In this embodiment, in addition to the active device 112 and the light shielding layer 114 , the active device array substrate 110 may further include a substrate S, a plurality of scan lines SL and a plurality of data lines DL. It can be seen from FIG. 1 that the scan line SL, the data line DL and the active device 112 are all disposed on the substrate S, and the active device 112 is electrically connected to the scan line SL and the data line DL. In addition, the light-shielding layer 114 includes a plurality of reflective pixel electrodes R, in other words, the light-shielding layer 114 is a patterned film, and each reflective pixel electrode R is electrically connected to the corresponding active device 112 . Based on the above, a single active device 112 and a single reflective pixel electrode R in the light-shielding layer 114 can form a so-called pixel P.

It can be seen from FIG. 1 that the electrophoretic display medium 126 of this embodiment is electrically insulated from the conductive layer 122 and is not in direct contact with the conductive layer 122 . In other words, the dielectric layer 124 is interposed between the electrophoretic display medium 126 and the conductive layer 122 . In addition, in this embodiment, each of the aforementioned electrophoretic display media 126 includes an electrophoretic fluid 126 a and a plurality of charged particles 126 b doped in the electrophoretic fluid 126 a. For example, the electrophoretic fluid 126a is a black electrophoretic fluid, and the charged particles 126b are white charged particles.

It should be noted that the size D1 of the pixel P on the active device array substrate 110 is, for example, between 140 micrometers and 160 micrometers, and is preferably 150 micrometers. In addition, the size D2 of the microcup 124a on the electrophoretic display film 120 is, for example, between 160 microns and 250 microns, and preferably is 250 microns. It can be seen from FIG. 1 that since the position of the electrophoretic display medium 126 is not completely aligned with the pixel P on the active element array substrate 110, part of the external light will directly pass through the dielectric layer 124 and irradiate the active element array substrate 110. However, these light rays will be shielded, reflected or absorbed by the reflective pixel electrode R, so the active device 112 is not easy to generate photocurrent.

Based on the above, the aforementioned light-shielding layer 114 (ie, the reflective pixel electrode R) can be a single-layer metal layer, a multi-layer metal layer, or other conductive materials suitable for shielding, reflecting or absorbing light.

【Second Embodiment】

FIG. 2 is a schematic cross-sectional view of an electrophoretic display panel according to a second embodiment of the present invention. Please refer to FIG. 2 , the electrophoretic display panel 100 ′ in this embodiment is similar to the electrophoretic display panel 100 in the first embodiment, but the main difference between the two lies in: the light shielding in the active element array substrate 110 ′ in this embodiment The layer 114 is located between the pixel electrode PE and the active device 112 , and the active device 112 and the pixel electrode PE form a plurality of pixels P. In other words, the light-shielding layer 114 and the pixel electrode PE belong to different film layers, which are different from the reflective pixel electrode R of the first embodiment.

Based on the above, the light-shielding layer 114 of this embodiment can be a metal layer with a single-layer structure, a metal layer with a multi-layer structure, a light-shielding layer of any material, a light-absorbing layer of any material, or other materials suitable for shielding, reflecting or absorbing light. Conductive material. Here, since conductivity is not an important consideration in material selection of the light-shielding layer 114 , the material of the light-shielding layer 114 can be a conductive material or a non-conductive material, which has a wide selection of materials.

Based on the above, since the electrophoretic display panel of the present invention uses a light-shielding layer (such as a reflective pixel electrode or a light-shielding film between the pixel electrode and the active element) to reduce the light leakage current generated by the active element after being irradiated by light, so The electrophoretic display panel of the present invention has better display quality.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. an electrophoretic display panel is characterized in that, comprising:

One active component array base board comprises a plurality of active members and a light shield layer; And

One electrophoretic display thin film is disposed on this active component array base board, and this electrophoretic display thin film comprises:

One conductive layer;

One dielectric layer is disposed on this conductive layer, and wherein this dielectric layer has a plurality of little cups that are arrayed, and this dielectric layer is between this conductive layer and this active component array base board, and this light shield layer is between this dielectric layer and described active member; And

A plurality of electrophoretic display mediums are disposed in described little cup.

2. electrophoretic display panel according to claim 1 is characterized in that, respectively this little cup is a polygon cylinder space, cylindroid body space, or cylindrical space.

3. electrophoretic display panel according to claim 1 is characterized in that, this electrophoretic display medium and this conductive layer are electrically insulated, and does not directly contact with this conductive layer.

4. electrophoretic display panel according to claim 1 is characterized in that, respectively this electrophoretic display medium comprises an electrophoresis liquid and a plurality of electrically charged particle that is doped in this electrophoresis liquid.

5. electrophoretic display panel according to claim 4 is characterized in that, this electrophoresis liquid is a black electrophoresis liquid, and described electrically charged particle is white electrically charged particle.

6. electrophoretic display panel according to claim 1 is characterized in that, this active component array base board also comprises:

One substrate;

The multi-strip scanning line is disposed on this substrate; And

Many data lines are disposed on this substrate;

Wherein said active member is disposed on this substrate, and electrically connect with described sweep trace and described data line accordingly respectively, described active member and this light shield layer constitute a plurality of pixels, and this light shield layer comprises a plurality of reflective pixel electrodes, and electrically connect with described active member.

7. electrophoretic display panel according to claim 1 is characterized in that, this active component array base board also comprises:

One substrate;

The multi-strip scanning line is disposed on this substrate;

Many data lines are disposed on this substrate;

A plurality of pixel electrodes; And

Wherein said active member is disposed on this substrate, and electrically connect with described sweep trace, described data line and described pixel electrode accordingly respectively, described active member and described pixel electrode constitute a plurality of pixels, and this light shield layer is between described pixel electrode and described active member.

8. an electrophoretic display panel is characterized in that, comprising:

One active component array base board comprises:

One substrate;

The multi-strip scanning line is disposed on this substrate;

Many data lines are disposed on this substrate;

A plurality of active members are disposed on this substrate; And

One light shield layer is arranged in a viewing area and covers at least one of described active member substantially; And

One electrophoretic display thin film is disposed on this active component array base board, and this electrophoretic display thin film comprises:

One conductive layer;

One dielectric layer is disposed on this conductive layer, and wherein this dielectric layer has a plurality of little cups that are arrayed, and this dielectric layer is between this conductive layer and this active component array base board; And

A plurality of electrophoretic display mediums are disposed in described little cup.

9. electrophoretic display panel according to claim 8 is characterized in that this dielectric layer is essentially transparent.

10. electrophoretic display panel according to claim 8 is characterized in that, described active member and this light shield layer constitute a plurality of pixels, and this light shield layer comprises a plurality of reflective pixel electrodes, and electrically connects with described active member.

11. electrophoretic display panel according to claim 8 is characterized in that, described active member and described pixel electrode constitute a plurality of pixels, and this light shield layer is between described pixel electrode and described active member.

12. an electrophoretic display panel is characterized in that, comprising:

One active component array base board comprises a plurality of active members and a light shield layer, and this light shield layer wherein is arranged in a viewing area and covers at least one of described active member substantially; And

One electrophoretic display thin film is disposed on this active component array base board.

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