TFT backplane and electronic paper for improving display of electronic paper frame

Abstract

The application relates to the technical field of display, and discloses a TFT back plate for improving the display of the frame of electronic paper, which comprises a display area and a boundary area at the periphery of the display area, the boundary pixels of the boundary area comprise virtual pixels in the horizontal row of the upper and lower sides and second normal pixels in the vertical column of the left and right sides, a pixel electrode layer is connected with a drain layer on the first normal pixel through a first connecting hole, and a boundary electrode layer is connected with the drain layer on the second normal pixel through a second connecting hole; the gate layer of the normal pixel and the gate layer of the second normal pixel are connected with the same horizontal row of gate scanning lines, the virtual source layer of the virtual pixel and the source layer of the second normal pixel are connected with the same vertical column of boundary data lines, and the gate scanning lines and the boundary data lines are connected with a driving IC; the application further discloses electronic paper; the application can make the charging voltage of the boundary area and the display area closer, improve the stability and uniformity of the voltage signal of the boundary area, and reduce the color difference during the display of the boundary area and the display area.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a TFT backplane and electronic paper for improving the bezel display of electronic paper. Background Technology

[0002] Electronic paper e-ink displays feature ultra-low power consumption, low-frequency display, and energy saving, making them widely applicable in electronic price tags, advertising signs, and bus stop signs. Current e-paper products have a border area around the display area. The display area contains normal pixels, while the border area contains dummy pixels. The border pixel electrode layer (typically a ring of conductive ITO layers) is located on the border area. In current e-paper products, the dummy pixels are in a floating state to protect the manufacturing stability of the display area pixels. Since the dummy pixels in the conventional border area do not have charging and discharging capabilities, the color display in the border area is achieved by transmitting the voltage signal output from the driver IC's border data line (VBD) through the border line. The boundary pixel electrode layer is directly connected to the edge pixel electrode layer for control; while the color display of the display area is achieved by controlling the voltage on both sides of the electronic film paper above the normal pixels. The common electrode layer on the upper side of the electronic film paper is electrically connected to the common electrode layer on the normal pixels, and the pixel electrode layer on the other side of the electronic film paper is electrically connected to the drain layer of the normal pixels. The normal pixels in the display area send data signals to the data line through the driver IC, and the display is performed after the TFT is charged and discharged. The difference in color display between the boundary area and the display area is mainly affected by factors such as panel load difference and TFT charging and discharging characteristics. For example, the boundary data line and the data line output are both 15V voltage, so the voltage of the boundary pixel electrode layer in the boundary area is 15V, while the voltage of the pixel electrode layer in the display area is only 13-14V due to the influence of TFT switch feedthrough. Summary of the Invention

[0003] The purpose of this invention is to provide a TFT backplane and electronic paper that improves the display of electronic paper borders, making the charging voltage of the border area and the display area closer, improving the stability and uniformity of the voltage signal in the border area, and reducing the color difference between the border area and the display area when displayed.

[0004] To achieve the above objectives, the present invention provides a TFT backplane for improving the bezel display of electronic paper, comprising a display area and a boundary area surrounding the outer periphery of the display area. The display area contains first normal pixels arranged in a matrix, each with a pixel electrode layer. The boundary area includes boundary pixels arranged in a matrix, each with a boundary electrode layer. Each boundary pixel includes virtual pixels located above and below the display area, and second normal pixels located to the left and right of the display area. The second normal pixels are sandwiched between the upper and lower virtual pixels. A first connection hole is provided on each of the first normal pixels, and the pixel electrode layer is connected to the display area via the first connection hole. The drain layer on the first normal pixel is connected, and the second normal pixel is provided with a second connection hole. The boundary electrode layer is connected to the drain layer on the second normal pixel through the second connection hole. The gate layer of the first normal pixel and the gate layer of the second normal pixel in each row are electrically connected to a horizontal row of gate scan lines. The virtual gate layer of the virtual pixel in each row is electrically connected to a horizontal row of virtual gate scan lines. The virtual source layer of the virtual pixel and the source layer of the first normal pixel in each column are electrically connected to a vertical column of data lines. The virtual source layer of the virtual pixel and the source layer of the second normal pixel in each column are electrically connected to a vertical column of boundary data lines. The gate scan lines, virtual gate scan lines, data lines, and boundary data lines are all electrically connected to the driver IC.

[0005] As a preferred embodiment of the present invention, the second normal pixel has the same structure and pattern as the first normal pixel.

[0006] In a preferred embodiment of the present invention, the virtual pixel includes a virtual gate layer and a virtual common electrode layer spaced apart on a substrate. A first insulating layer is disposed above the virtual gate layer and the virtual common electrode layer, and a second insulating layer is disposed above the first insulating layer. The virtual source layer is disposed between the first insulating layer and the second insulating layer of the virtual pixel, and the boundary electrode layer is disposed above the second insulating layer of the virtual pixel.

[0007] In a preferred embodiment of the present invention, both the first normal pixel and the second normal pixel include a gate layer and a common electrode layer disposed at intervals on the substrate. A first insulating layer is disposed above the gate layer and the common electrode layer, and a second insulating layer is disposed above the first insulating layer. A source layer, a drain layer, and an active layer are disposed between the first insulating layer and the second insulating layer. The source layer and the drain layer are respectively connected to both sides of the active layer. The pixel electrode layer is disposed above the second insulating layer of the first normal pixel, and the boundary electrode layer is disposed above the second insulating layer of the second normal pixel.

[0008] Furthermore, another aspect of the present invention provides an electronic paper, including the aforementioned TFT backplane for improving the electronic paper bezel display.

[0009] Compared with the prior art, the TFT backplate of the present invention for improving the bezel display of electronic paper has the following advantages:

[0010] This invention sets the left and right sides of the boundary pixel in the boundary area as second normal pixels, and electrically connects the boundary data line to the source layer of the second normal pixels on the left and right sides of the same vertical column. The second normal pixels in the same horizontal row share the same gate scan line with the first normal pixels in the display area. When the gate scan line is turned on, while the data line charges the first normal pixel in the display area, the boundary data line also charges the second normal pixel in the boundary area. Both the first normal pixel in the display area and the second normal pixel in the boundary area are charged and discharged through TFT switches. This makes the charging voltage of the boundary area and the display area closer, improves the stability and uniformity of the voltage signal in the boundary area, reduces the color difference between the boundary area and the display area, and thus improves the visual effect of the boundary area display, thereby improving the display effect of the electronic paper border. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0012] Figure 1 This is a schematic diagram of the structure of a TFT backplane in the prior art;

[0013] Figure 2 This is a schematic diagram of the normal pixels in the display area and the virtual pixels in the boundary area of ​​a TFT backplane in the prior art;

[0014] Figure 3 Yes, yes Figure 2 A sectional view of aa;

[0015] Figure 4 This is a schematic diagram of the structure of a TFT backplate for improving the bezel display of electronic paper provided by the present invention;

[0016] Figure 5 This is a schematic diagram of the arrangement of boundary data lines in a TFT backplane for improving the bezel display of electronic paper, provided by the present invention.

[0017] Figure 6 This is a schematic diagram of the structure of the display area and the boundary area in a TFT backplate for improving the electronic paper bezel display provided by the present invention;

[0018] In the diagram, 1 is the display area; 2 is the boundary area; 3 is the first normal pixel; 31 is the gate layer; 32 is the source layer; 33 is the drain layer; 4 is the active layer 3; 35 is the common electrode layer; 36 is the first connection hole; 37 is the pixel electrode layer; 4 is the virtual pixel; 41 is the virtual gate layer; 42 is the virtual source layer; 43 is the virtual common electrode layer; 44 is the first insulating layer; 45 is the second insulating layer; 46 is the boundary electrode layer; 47 is the virtual drain layer; 5 is the second normal pixel; 51 is the second connection hole; 61 is the gate scan line; 62 is the data line; 63 is the virtual gate scan line; 64 is the boundary data line; 65 is the boundary line; 7 is the electronic film paper; 71 is the common electrode layer; 8 is the substrate; and 9 is the driver IC. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms; these terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0021] like Figures 3-6As shown in the preferred embodiment of the present invention, a TFT backplane for improving the bezel display of electronic paper includes a display area 1 and a boundary area 2 surrounding the outer periphery of the display area 1. The display area 1 contains first normal pixels 3 arranged in a matrix, and each first normal pixel 3 has a pixel electrode layer 37. The boundary area 2 includes boundary pixels arranged in a matrix, and each boundary pixel has a boundary electrode layer 46. Each boundary pixel includes virtual pixels 4 located above and below the display area 1, and second normal pixels 5 located to the left and right of the display area 1. The second normal pixels 5 are sandwiched between the upper and lower virtual pixels 4. Each first normal pixel 3 has a first connection hole 36, and the pixel electrode layer 37 connects to the drain electrode on the first normal pixel 3 through the first connection hole 36. Layer 33 is connected, and the second normal pixel 5 is provided with a second connection hole 51. The boundary electrode layer 46 is connected to the drain layer 33 on the second normal pixel 5 through the second connection hole 51. The gate layer of the first normal pixel and the gate layer of the second normal pixel 5 in each row are electrically connected to a horizontal row of gate scan lines 61. The virtual gate layer 41 of the virtual pixel 4 in each row is electrically connected to a horizontal row of virtual gate scan lines 63. The virtual source layer 42 of the virtual pixel 4 and the source layer 32 of the first normal pixel 3 in each column are electrically connected to a vertical column of data lines 62. The virtual source layer 42 of the virtual pixel 4 and the source layer 32 of the second normal pixel 5 in each column are electrically connected to a vertical column of boundary data lines 64. The gate scan lines 61, virtual gate scan lines 63, data lines 62, and boundary data lines 64 are all electrically connected to the driver IC9.

[0022] This invention sets the left and right sides of the boundary pixel of the boundary region 2 as second normal pixels 5, and the boundary data line 64 is electrically connected to the source layer 32 of the second normal pixels 5 on the left and right sides of the same vertical column. The second normal pixels 5 in the same horizontal row share the same gate scan line 61 with the first normal pixels 3 of the display area 1. When the gate scan line 61 is turned on, when the data line 62 charges the first normal pixels 3 of the display area 1, the boundary data line 64 also charges the second normal pixels 5 of the boundary region 2. The first normal pixels 3 of the display area 1 and the second normal pixels 5 of the boundary region 2 are charged and discharged through the TFT switch. This makes the charging voltage of the boundary region 2 and the display area 1 closer, improves the stability and uniformity of the voltage signal of the boundary region 2, reduces the color difference between the boundary region 2 and the display area 1, and thus improves the display effect of the boundary region 2, thereby improving the display effect of the electronic paper border.

[0023] Specifically, the second normal pixel 5 has the same structure and pattern as the first normal pixel 3, making the electronic paper display effect more stable.

[0024] Furthermore, the virtual pixel 4 includes a virtual gate layer 41 and a virtual common electrode layer 43 spaced apart on the substrate 8. A first insulating layer 44 is disposed above the virtual gate layer 41 and the virtual common electrode layer 43, and a second insulating layer 45 is disposed above the first insulating layer 44. The virtual source layer 42 is disposed between the first insulating layer 44 and the second insulating layer 45 of the virtual pixel 4, and the boundary electrode layer 46 is disposed above the second insulating layer 45 of the virtual pixel 4.

[0025] For example, both the first normal pixel 3 and the second normal pixel 5 include a gate layer 31 and a common electrode layer 35 spaced apart on the substrate 8. A first insulating layer 44 is disposed above the gate layer 31 and the common electrode layer 35, and a second insulating layer 45 is disposed above the first insulating layer 44. A source layer 32, a drain layer 33, and an active layer 34 are disposed between the first insulating layer 44 and the second insulating layer 45. The source layer 32 and the drain layer 33 are respectively connected to both sides of the active layer 32. The pixel electrode layer 37 is disposed above the second insulating layer 45 of the first normal pixel 3, and the boundary electrode layer 46 is disposed above the second insulating layer 45 of the second normal pixel 5. This allows the charging voltage of the boundary region 2 and the display region 1 to be closer, reducing color differences when displaying images. The structure of the first normal pixel 3 and the second normal pixel 5 is the same as the existing normal pixel structure.

[0026] In addition, the present invention also provides an electronic paper, including the above-mentioned TFT backplate for improving the display of the electronic paper bezel, and thus has all the beneficial effects of the above-mentioned TFT backplate for improving the display of the electronic paper bezel, which will not be described in detail here.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A TFT backplate for improving the bezel display of electronic paper, comprising a display area and a boundary area surrounding the outer periphery of the display area, characterized in that, The display area includes first normal pixels arranged in a matrix, each with a pixel electrode layer. The boundary area includes boundary pixels arranged in a matrix, each with a boundary electrode layer. Each boundary pixel includes virtual pixels located above and below the display area, and second normal pixels located on the left and right sides of the display area. The second normal pixels are sandwiched between the upper and lower virtual pixels. The first normal pixel has a first connection hole, through which the pixel electrode layer is connected to the drain layer of the first normal pixel. The second normal pixel has a second connection hole. The boundary electrode layer is connected to the drain layer on the second normal pixel through the second connection hole; the gate layer of the first normal pixel and the gate layer of the second normal pixel in each row are electrically connected to a horizontal row of gate scan lines; the virtual gate layer of the virtual pixel in each row is electrically connected to a horizontal row of virtual gate scan lines; the virtual source layer of the virtual pixel in each column and the source layer of the first normal pixel are electrically connected to a vertical column of data lines; the virtual source layer of the virtual pixel in each column and the source layer of the second normal pixel are electrically connected to a vertical column of boundary data lines; the gate scan lines, virtual gate scan lines, data lines, and boundary data lines are all electrically connected to the driver IC.

2. The TFT backplate for improving the bezel display of electronic paper as described in claim 1, characterized in that, The second normal pixel has the same structure and pattern as the first normal pixel.

3. The TFT backplate for improving the bezel display of electronic paper as described in claim 2, characterized in that, The virtual pixel includes a virtual gate layer and a virtual common electrode layer spaced apart on a substrate. A first insulating layer is disposed above the virtual gate layer and the virtual common electrode layer, and a second insulating layer is disposed above the first insulating layer. The virtual source layer is disposed between the first insulating layer and the second insulating layer of the virtual pixel, and the boundary electrode layer is disposed above the second insulating layer of the virtual pixel.

4. The TFT backplate for improving the bezel display of electronic paper as described in claim 3, characterized in that, Both the first normal pixel and the second normal pixel include a gate layer and a common electrode layer spaced apart on the substrate. A first insulating layer is provided above the gate layer and the common electrode layer, and a second insulating layer is provided above the first insulating layer. A source layer, a drain layer, and an active layer are provided between the first insulating layer and the second insulating layer. The source layer and the drain layer are respectively connected to both sides of the active layer. The pixel electrode layer is provided above the second insulating layer of the first normal pixel, and the boundary electrode layer is provided above the second insulating layer of the second normal pixel.

5. An electronic paper, characterized in that, Includes the TFT backplate for improving electronic paper bezel display as described in any one of claims 1 to 4.

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