CN109856871B - Display substrate, display panel and display device - Google Patents
Display substrate, display panel and display device Download PDFInfo
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- CN109856871B CN109856871B CN201910250394.9A CN201910250394A CN109856871B CN 109856871 B CN109856871 B CN 109856871B CN 201910250394 A CN201910250394 A CN 201910250394A CN 109856871 B CN109856871 B CN 109856871B
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Abstract
The invention provides a display substrate which comprises a substrate base plate, wherein the display substrate further comprises a first transparent electrode layer and a second transparent electrode layer, the substrate base plate, the first transparent electrode layer and the second transparent electrode layer are sequentially stacked along the thickness direction of the display substrate, the first transparent electrode layer and the second transparent electrode layer are insulated and spaced, the first transparent electrode layer comprises a plurality of first transparent electrode strips arranged at intervals, the second transparent electrode layer comprises a plurality of second transparent electrode strips arranged at intervals, and the extending direction of the first transparent electrode strips is the same as the extending direction of the second transparent electrode strips. The invention also provides a display panel and a display device. The display substrate can realize a high-resolution display panel at a low cost.
Description
Technical Field
The present invention relates to the field of display devices, and in particular, to a display substrate, a display panel including the display substrate, and a display apparatus including the display panel.
Background
With the development of liquid crystal display technology, bistable liquid crystal display devices have appeared. Each pixel unit in the bistable liquid crystal display device can realize a bright state and a dark state, and therefore, the bistable liquid crystal display device has been widely applied to electronic devices such as electronic tags, electronic books, and writing pads.
FIG. 3 is a schematic diagram of a bistable liquid crystal display panel, and FIG. 1 is a schematic diagram of one display substrate of the bistable liquid crystal display panel shown in FIG. 3; fig. 2 is a schematic view of another display substrate of the bistable liquid crystal display panel shown in fig. 3.
The display substrate shown in fig. 1 comprises transparent electrode stripes 11 extending in a first direction and the display substrate shown in fig. 2 comprises transparent electrode stripes 11 extending in a second direction. As shown in fig. 3, after the display panel is obtained by pairing the display substrate of fig. 1 and the display substrate of fig. 2, the transparent electrode stripes extending along the first direction and the transparent electrode stripes extending along the second direction cross each other, thereby defining a plurality of pixel units. Shown in fig. 4 is a cross-sectional view of the display panel shown in fig. 3 at a-a, an electric field may be formed between the two display substrates to drive the liquid crystal molecules in the liquid crystal material to deflect when a voltage is applied to the transparent electrode stripes 11 on the two display substrates, wherein in fig. 4 the dashed arrows indicate the electric field lines and the liquid crystal material is a bistable liquid crystal.
The bistable liquid crystal display device is driven in a passive mode, that is, a driving chip is adopted to respectively provide voltage for the transparent electrode strips on the two display substrates so as to form an electric field between the two display substrates and drive liquid crystal molecules to deflect. However, the current driving chip has a limited output voltage, which results in a low resolution of the current bistable liquid crystal display device. If the resolution of the bistable liquid crystal display device is to be improved, a driving chip with a more complex circuit structure needs to be designed, which increases the manufacturing cost.
Therefore, how to realize a bistable liquid crystal display device with high resolution at low cost is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a display substrate, a display panel and a display device comprising the display panel. The display substrate may have a higher resolution.
In order to achieve the above object, as an aspect of the present invention, a display substrate is provided, where the display substrate includes a substrate base, and the display substrate further includes a first transparent electrode layer and a second transparent electrode layer, where the substrate base, the first transparent electrode layer, and the second transparent electrode layer are sequentially stacked in a thickness direction of the display substrate, and the first transparent electrode layer and the second transparent electrode layer are insulated and spaced apart from each other, the first transparent electrode layer includes a plurality of first transparent electrode stripes spaced apart from each other, the second transparent electrode layer includes a plurality of second transparent electrode stripes spaced apart from each other, and an extending direction of the first transparent electrode stripes is the same as an extending direction of the second transparent electrode stripes.
Preferably, the width of the first transparent electrode stripes is greater than the width of the second transparent electrode stripes, and the orthographic projection of the second transparent electrode stripes on the first transparent electrode stripes is located on the first transparent electrode stripes.
Preferably, the plurality of first transparent electrode strips correspond to the plurality of second transparent electrode strips one to one, and a width center line of an orthographic projection of the second transparent electrode strip on the corresponding first transparent electrode strip coincides with a width center line of the corresponding first transparent electrode strip.
Preferably, an alignment layer is disposed on a side of the second transparent electrode layer facing away from the first transparent electrode layer.
Preferably, the display substrate includes an insulating spacer layer disposed between the first transparent electrode layer and the second transparent electrode layer.
As a second aspect of the present invention, a display panel is provided, where the display panel includes two display substrates and a liquid crystal layer disposed between the two display substrates, each of the two display substrates includes a plurality of first transparent electrode stripes, the extending directions of the first transparent electrode stripes on the same display substrate are the same, and the extending directions of the first transparent electrode stripes on different display substrates are crossed, where at least one of the two display substrates is the above display substrate provided by the present invention.
Preferably, the extending directions of the first transparent electrode stripes of the two display substrates are perpendicular.
Preferably, the liquid crystal layer comprises a bistable liquid crystal.
As a third aspect of the present invention, a display device is provided, which includes a display panel, wherein the display panel is the display panel provided by the present invention.
Preferably, the display device includes a second driving chip for supplying a voltage to the two display substrates, wherein,
in a display substrate comprising second transparent electrode strips, a voltage difference exists between a voltage received by the second transparent electrode strips and a voltage received by the first transparent electrode strips;
in the two display substrates, a voltage difference exists between the voltage received by the first transparent electrode strip of one display substrate and the voltage received by the first transparent electrode strip of the other display substrate.
Preferably, the first transparent electrode stripes of the two display substrates receive the same voltage value.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a display substrate of a prior art display device;
FIG. 2 is a schematic view of another display substrate of a prior art display device;
FIG. 3 is a schematic diagram of a prior art display device;
FIG. 4 is a schematic sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of a display substrate provided in the present invention;
FIG. 6 is a cross-sectional view B-B of FIG. 5;
FIG. 7 is a schematic diagram of one embodiment of a display panel;
fig. 8 is a C-C sectional view of the display panel shown in fig. 7;
FIG. 9 is a schematic diagram of another embodiment of a display panel provided in the present invention;
fig. 10 is a D-D sectional view of the display panel shown in fig. 9.
Description of the reference numerals
11: transparent electrode stripes 110: substrate base plate
111: first transparent electrode stripes 112: second transparent electrode strip
113: insulating spacer layer 114: alignment layer
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As an aspect of the present invention, there is provided a display substrate, as shown in fig. 5 and 6, which includes a substrate 110, wherein the display substrate 110 further includes a first transparent electrode layer and a second transparent electrode layer. The substrate 110, the first transparent electrode layer, and the second transparent electrode layer are sequentially stacked in a thickness direction (i.e., a vertical direction in fig. 6) of the display substrate, and the first transparent electrode layer and the second transparent electrode layer are insulated and spaced apart from each other. The first transparent electrode layer comprises a plurality of first transparent electrode strips 111 arranged at intervals, the second transparent electrode layer comprises a plurality of second transparent electrode strips 112 arranged at intervals, and the extending direction of the first transparent electrode strips 111 is the same as that of the second transparent electrode strips 112.
By forming a display panel using the display substrate provided by the present invention, a display panel shown in fig. 8 (one display substrate is the display substrate provided by the present invention) or a display panel shown in fig. 10 (both display substrates are the display substrates provided by the present invention) can be obtained. As shown in fig. 8 and 10, the display panel includes two display substrates. It is noted that the extending direction of the first transparent electrode stripes is different in the two display substrates. The first transparent electrode strips on the two display substrates are intersected with each other to define a pixel unit.
When the display substrate provided by the invention is applied to a display panel, and the display panel is powered by using a driving chip, in the display substrate comprising the first transparent electrode strips 111 and the second transparent electrode strips 112, the first transparent electrode strips 111 and the second transparent electrode strips 112 can both receive a voltage, so that an electric field capable of driving liquid crystal molecules in the display panel to deflect is generated between the edge of the second transparent electrode strips 112 and the first transparent electrode strips 111. The curved dashed arrows in fig. 8 and 10 indicate electric field lines in the electric field between the second transparent electrode bars 112 and the first transparent electrode bars 111, and the curved electric field lines indicate an electric field including an electric field component in a vertical direction. Since the extending direction of the second transparent electrode stripes 112 is the same as the extending direction of the first transparent electrode stripes 111, the arrangement of the second transparent electrode stripes 112 on the same display substrate does not affect the normal deflection of the liquid crystal molecules.
In the present invention, the second transparent electrode stripes 112 may be continuous electrode stripes or may be a plurality of electrically connected independent electrode blocks.
Therefore, when the display panel displays, the liquid crystal molecules are not only influenced by the electric field between the two display panels, but also influenced by the electric field between the first transparent electrode stripes 111 and the second transparent electrode stripes 112 on the same display substrate, so that the deflection degree of the liquid crystal molecules can be increased. In other words, in order to deflect the same angle (e.g., 90 °), the voltage required to drive the liquid crystal molecules in the pixel cell shown in fig. 8 and 10 is smaller than that in the pixel cell shown in fig. 4.
Since the voltage for driving the liquid crystal molecules to deflect in the display panel including the display substrate is reduced, more first and second transparent electrode bars may be disposed in the display substrate, thereby implementing a high-resolution display panel. Accordingly, the driving of the display panel with high resolution can be realized only by increasing the number of the voltage output ports of the driving chip without performing complicated circuit improvement on the driving chip, so that the display device has lower cost.
It is to be explained that a vertical electric field component between the second transparent electrode stripes 112 and the first transparent electrode stripes plays a role in driving the liquid crystal molecules. In the present invention, the specific structure and shape of the second transparent electrode stripes 112 are not particularly limited. In order to increase the vertical electric field component between the first transparent electrode stripes 111 and the second transparent electrode stripes, it is preferable that the width of the first transparent electrode stripes 111 is greater than the width of the second transparent electrode stripes 112, and the orthographic projection of the second transparent electrode stripes 112 on the first transparent electrode stripes 111 is located on the first transparent electrode stripes 111.
In this way, vertical electric field components can be generated between the two side edges of the second transparent electrode strips 112 and the first transparent electrode strips 111, so that the voltage for driving liquid crystal molecules to deflect is further reduced, and the resolution of the display panel comprising the display substrate is further improved.
Of course, it is also possible that the orthographic projection of the second transparent electrode stripes 112 on the layer where the first transparent electrode stripes 111 are located overlaps the first transparent electrode stripes 111. It is also possible that the width of the second transparent electrode stripes 112 is greater than the width of the first transparent electrode stripes 111.
In order to improve the uniformity of the liquid crystal molecule deflection at different pixel units, preferably, the plurality of first transparent electrode stripes 111 correspond to the plurality of second transparent electrode stripes 112 one to one, and the width central line of the orthographic projection of the second transparent electrode stripes 112 on the corresponding first transparent electrode stripes 111 coincides with the width central line of the corresponding first transparent electrode stripes 111.
As described above, the first transparent electrode layer including the plurality of first transparent electrode stripes 111 and the second transparent electrode layer including the plurality of second transparent electrode stripes 112 are disposed at an insulating interval, and thus, preferably, the display substrate may further include an insulating spacer layer 113 disposed between the first transparent electrode layer and the second transparent electrode layer. In the present invention, the specific material of the insulating spacers is not particularly limited, and for example, the insulating spacers 113 may be made of silicon oxide and/or silicon nitride.
In order to fix the initial alignment of the liquid crystal molecules, it is preferable that the second transparent electrode layer is provided with an alignment layer 114 on a side facing away from the first transparent electrode layer.
As a second aspect of the present invention, a display panel is provided, where the display panel includes two display substrates and a liquid crystal layer disposed between the two display substrates, each of the two display substrates includes a plurality of first transparent electrode stripes, the extending directions of the first transparent electrode stripes on the same display substrate are the same, and the extending directions of the first transparent electrode stripes on different display substrates intersect, where at least one of the two display substrates is the above display substrate provided by the present invention.
As described above, since the second transparent electrode stripes are disposed on at least one display substrate, the deflection voltage for driving the liquid crystal molecules to deflect can be reduced, and a high-resolution display panel can be realized at a low cost without changing the driving chip.
In the embodiments shown in fig. 7 and 8, one of the display substrates in the display panel is the display substrate provided by the present invention, and the other display substrate does not include the second transparent electrode stripes.
Specifically, the display substrate excluding the second transparent electrode stripes includes a base substrate 110 and first transparent electrode stripes 111.
After power is supplied to the first transparent electrode stripes 111 of the two display substrates and power is supplied to the second transparent electrode stripes 112 on one display substrate, an electric field formed between the two display substrates is as shown in fig. 8: a part is a vertical electric field formed between the first transparent electrode stripes 111 on the two display substrates; the other part is an electric field between the first transparent electrode stripes 111 and the second transparent electrode stripes 112 on one display substrate (the display substrate located below in fig. 8).
At each pixel unit, the liquid crystal molecules are subjected to a superposition effect of an electric field between the first transparent electrode stripes 111 on the two display substrates and an electric field between the first transparent electrode stripes 111 and the second transparent electrode stripes 112 on the underlying display substrate.
In the embodiments shown in fig. 9 and 10, both display substrates of the display panel are the display substrate provided by the present invention. That is, the upper display substrate includes the first and second transparent electrode stripes 111 and 112, and the lower display substrate also includes the first and second transparent electrode stripes 111 and 112.
After power is supplied to the first transparent electrode stripes 111 and the second transparent electrode stripes 112 of the two display substrates, an electric field formed between the two display substrates is as shown in fig. 10: a part is a vertical electric field formed between the first transparent electrode stripes 111 on the two display substrates; the other part is an electric field between the first transparent electrode stripes 111 and the second transparent electrode stripes 112 on one display substrate; and a part of the electric field between the first transparent electrode stripes 111 and the second transparent electrode stripes 112 on the other display substrate.
The advantages and benefits of providing the second transparent electrode stripes 112 have been described in detail above and will not be described in detail here.
The extending directions of the first transparent electrode strips on the two display substrates are crossed, and pixel units are formed at the crossed positions. For convenience of display, the extending directions of the first transparent electrode stripes of the two display substrates are preferably perpendicular, so that the formed pixel units are rectangular pixel units, and different images can be displayed by controlling the colors of the rectangular pixel units.
In the present invention, the liquid crystal layer includes bistable liquid crystal. In particular, the bistable liquid crystal may be a cholesteric liquid crystal. The brightness switching of the pixel unit can be realized by switching the cholesteric liquid crystal between a planar state and a focal conic state. The bistable liquid crystal may also be a smectic liquid crystal. The bright-dark switching of the pixel cell can be realized by switching the smectic phase liquid crystal between the focal conic state and the vertical state.
As a third aspect of the present invention, a display device is provided, which includes a display panel, wherein the display panel is the display panel provided by the present invention.
The display device can be a mobile phone, a television, a smart watch, a tablet personal computer, an electronic tag, an electronic book, a handwriting pad, a billboard, a bank card, a U shield and other electronic equipment.
Preferably, the display device includes a second driving chip for supplying a voltage to the two display substrates.
In the display substrate including the second transparent electrode strips, a voltage difference exists between a voltage received by the second transparent electrode strips and a voltage received by the first transparent electrode strips (for example, the voltage received by the second transparent electrode strips is the same as the voltage received by the first transparent electrode strips, and the polarity of the voltage is opposite); in the two display substrates, a voltage difference exists between a voltage received by the first transparent electrode bar of one display substrate and a voltage received by the first transparent electrode bar of the other display substrate (for example, the voltage received by the first transparent electrode bar of one display substrate is a positive voltage, and the voltage received by the first transparent electrode bar of the other display substrate is a negative voltage).
Preferably, the first transparent electrode stripes of the two display substrates receive the same voltage value.
Examples
Example 1
As shown in fig. 7 and 8, the display panel includes two display substrates and cholesteric liquid crystal disposed between the two display substrates. As shown in fig. 8, the upper display substrate includes a base substrate 110, first transparent electrode stripes 111, an alignment layer 114; the lower display substrate comprises a substrate 110, a first transparent electrode strip 111, an insulating spacer layer 113, a second transparent electrode strip 112 and an orientation layer 114. The first transparent electrode strips of the upper display substrate extend along the transverse direction, and the first transparent electrode strips of the lower display substrate extend along the vertical direction. The driving voltage of the cholesteric liquid crystal was 20V.
Example 2
As shown in fig. 9 and 10, the display panel includes two display substrates and cholesteric liquid crystal disposed between the two display substrates. As shown in fig. 10, the display substrates of both include a substrate 110, a first transparent electrode stripe 111, an insulating spacer layer 113, a second transparent electrode stripe 112, and an alignment layer 114. The first transparent electrode strips of the upper display substrate extend along the transverse direction, and the first transparent electrode strips of the lower display substrate extend along the vertical direction. The driving voltage of the cholesteric liquid crystal was 20V.
Comparative example
As shown in fig. 3 and 4, the display panel includes two display substrates and cholesteric liquid crystal disposed between the two display substrates. As shown in fig. 4, the display substrates of both include a base substrate 11, transparent electrode stripes 11, and an alignment layer. The transparent electrode strips of the upper display substrate extend along the transverse direction, and the transparent electrode strips of the lower display substrate extend along the vertical direction. The driving voltage of the cholesteric liquid crystal was 20V.
Test example
For example 1: the driving chip is used for providing a voltage V1 for the first transparent electrode bar of the upper display substrate, the driving chip is used for providing a voltage V2 for the first transparent electrode bar of the lower display substrate, and the driving chip is used for providing a voltage V3 for the second transparent electrode bar of the lower display substrate. The liquid crystal molecules are subjected to voltages of (V1-V2) + (V1-V3) + (V2-V3).
For example 2: the driving chip is used for providing a voltage V1 for the first transparent electrode bar of the display substrate above, the driving chip is used for providing a voltage V2 for the first transparent electrode bar of the display substrate below, the driving chip is used for providing a voltage V3 for the second transparent electrode bar of the display substrate below, and the driving chip is used for providing a voltage V4 for the second transparent electrode bar of the display substrate above. The liquid crystal molecules are subjected to voltages of (V1-V2) + (V1-V4) + (V2-V4) + (V1-V3) + (V3-V2) + (V3-V4).
Comparative example: the driving chip is used for providing a voltage V1 for the first transparent electrode bar of the upper display substrate, and the driving chip is used for providing a voltage V2 for the first transparent electrode bar of the lower display substrate. The liquid crystal molecules are subjected to voltages of (V1-V2).
In order to make the liquid crystal molecules receive 20V, the voltages required by the display panels are as follows:
it is understood that the display device of example 1 can be driven by the driver chip capable of outputting 5V, the display device of example 2 can be driven by the driver chip capable of outputting 3.5V, and the display device of comparative example 1 can be driven by the driver chip capable of outputting 10V.
The display device in comparative example 2 consumes less power in order to drive the display device with the same resolution. In other words, the display device having the structure shown in embodiment 2 can have higher resolution when driven with the same chip.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. The utility model provides a display device, display device includes display panel and driver chip, display panel includes two display substrates of a pair setting and sets up two liquid crystal layer between the display substrate, two display substrate all includes a plurality of first transparent electrode strips, and the extending direction of first transparent electrode strip on same display substrate is the same, and the extending direction of first transparent electrode strip on the different display substrates is crossed, its characterized in that, two at least one in the display substrate is the display substrate who has following characteristic: the display substrate comprises a substrate, a first transparent electrode layer and a second transparent electrode layer, wherein the substrate, the first transparent electrode layer and the second transparent electrode layer are sequentially stacked along the thickness direction of the display substrate, the first transparent electrode layer and the second transparent electrode layer are insulated and spaced, the first transparent electrode layer comprises a plurality of first transparent electrode strips arranged at intervals, the second transparent electrode layer comprises a plurality of second transparent electrode strips arranged at intervals, and the extending direction of the first transparent electrode strips is the same as that of the second transparent electrode strips; wherein the content of the first and second substances,
in the display substrates comprising the second transparent electrode strips, a voltage difference exists between a voltage received by the second transparent electrode strips and a voltage received by the first transparent electrode strips, and in the two display substrates, a voltage difference exists between a voltage received by the first transparent electrode strips of one display substrate and a voltage received by the first transparent electrode strips of the other display substrate so as to drive liquid crystal molecules to deflect;
the driving chip is used for providing voltage for the two display substrates, wherein,
in a display substrate comprising second transparent electrode strips, a voltage difference exists between a voltage received by the second transparent electrode strips and a voltage received by the first transparent electrode strips;
in the two display substrates, a voltage difference exists between a voltage received by the first transparent electrode strip of one display substrate and a voltage received by the first transparent electrode strip of the other display substrate;
the first transparent electrode strips of the two display substrates receive the same voltage value.
2. The display device according to claim 1, wherein the width of the first transparent electrode stripes is greater than the width of the second transparent electrode stripes, and an orthographic projection of the second transparent electrode stripes on the first transparent electrode stripes is located on the first transparent electrode stripes.
3. The display device according to claim 2, wherein the first transparent electrode stripes and the second transparent electrode stripes correspond to each other one by one, and a width center line of an orthographic projection of the second transparent electrode stripes on the corresponding first transparent electrode stripes coincides with a width center line of the corresponding first transparent electrode stripes.
4. A display device as claimed in any one of claims 1 to 3, wherein a side of the second transparent electrode layer facing away from the first transparent electrode layer is provided with an alignment layer.
5. A display device as claimed in any one of claims 1 to 3, wherein the display substrate comprises an insulating spacer layer provided between the first transparent electrode layer and the second transparent electrode layer.
6. A display device as claimed in any one of claims 1 to 3, wherein the first transparent electrode stripes of both display substrates extend in a direction perpendicular to each other.
7. A display device as claimed in any one of claims 1 to 3, wherein the liquid crystal layer comprises a bistable liquid crystal.
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| CN102636920A (en) * | 2011-07-19 | 2012-08-15 | 京东方科技集团股份有限公司 | Hard-screen liquid crystal display device, implementation method and application of hard-screen liquid crystal display device |
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| CN103091931A (en) * | 2013-01-30 | 2013-05-08 | 深圳市华星光电技术有限公司 | Liquid crystal lens and stereo display device |
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