CN111754873A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111754873A CN111754873A CN202010590131.5A CN202010590131A CN111754873A CN 111754873 A CN111754873 A CN 111754873A CN 202010590131 A CN202010590131 A CN 202010590131A CN 111754873 A CN111754873 A CN 111754873A
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- thin film
- display panel
- pixel
- bending
- display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The display panel comprises a bending area and a non-bending area, wherein the arrangement direction of thin film transistors corresponding to the bending area is parallel to the bending axis of the bending area, and meanwhile, the grids of the thin film transistors in the bending area are arranged in a separated mode and are connected in parallel. And then reduced the stress of TFT in the bending region to increase the drive current of TFT when driving, the folding panel has been improved effectively and has been shown the unusual problem of easy formation display stripe etc. in the display process, has improved display quality.
Description
Technical Field
The present disclosure relates to the field of panel display technologies, and in particular, to a display panel and a display device.
Background
Active matrix organic light-emitting diodes (AMOLEDs) are expected to band liquid crystals from becoming the mainstream choice of next generation displays due to their characteristics of high contrast, wide viewing angle, fast response speed, flexibility, etc.
Meanwhile, as the number of display types increases, the folding panel becomes a new choice for some display devices. Folding panel can be along with user's demand and be constantly buckled in the use, when buckling, the Thin Film Transistor (TFT) that panel folding region corresponds can suffer folding stress effect for a long time, the degree of buckling is big more, stress action is more obvious, because bear stress action for a long time finally lead to thin film transistor's driving capability to reduce, and cause folding panel to form display strip etc. at folding region in the display process and show unusually easily, influence display panel's normal use.
In summary, in the conventional foldable panel, the thin film transistor corresponding to the bending region in the foldable panel is subjected to a folding stress for a long time, so that the mobility of the thin film transistor is changed, and the leakage current is reduced. Finally, the driving capability of the thin film transistor is reduced, and display abnormalities such as display stripes are easily formed in the folding area of the folding panel in the display process, so that the normal use of the display panel is affected.
Disclosure of Invention
The present disclosure provides a display panel and a display device, so as to solve the display abnormality problems of the conventional display panel, such as the thin film transistor corresponding to the bending region of the display panel is subjected to a folding stress for a long time, the driving capability of the thin film transistor is reduced, and a display stripe is easily formed in the folding region in the display process.
To solve the above technical problem, the technical solution provided by the embodiment of the present disclosure is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a display panel including a bending region and a non-bending region adjacent to the bending region, the display panel including:
a substrate; and
a pixel driving circuit disposed on the substrate;
the pixel driving circuit comprises a plurality of thin film transistors, and the arrangement direction of the thin film transistors corresponding to the bending region is parallel to the bending axis of the bending region.
According to an embodiment of the present disclosure, a channel direction of the thin film transistor corresponding to the bending region is the same as a direction of the bending axis.
According to an embodiment of the present disclosure, the gate of the thin film transistor corresponding to the bending region includes a plurality of branch gates.
According to an embodiment of the present disclosure, voltages of the branch gates of the corresponding thin film transistors in each pixel unit are the same, and currents of the branch gates are different.
According to an embodiment of the present disclosure, the gate of the thin film transistor is close to the pixel unit and the branch gates are three branch gates.
According to an embodiment of the present disclosure, the adjacent branch gates are spaced apart.
According to an embodiment of the present disclosure, the distance of the spacing between each of the branch gates is the same.
According to an embodiment of the present disclosure, the thin film transistors corresponding to the bending regions are arranged in parallel.
According to an embodiment of the present disclosure, the pixel driving circuit corresponds to a plurality of pixel units, and each pixel unit includes a red sub-pixel, a blue sub-pixel, and a green sub-pixel.
According to a second aspect of the embodiments of the present disclosure, there is also provided a display device including the display panel provided by the embodiments of the present disclosure.
In summary, the beneficial effects of the embodiment of the present disclosure are:
the display panel and the display device provided by the embodiment of the disclosure set the arrangement direction of the corresponding thin film transistors in the bending region to be parallel to the bending axis direction of the bending region, and simultaneously separate the gates of the thin film transistors in the bending region and connect the gates in parallel. And then reduced folding panel's bending zone when buckling, the stress that thin-film transistor bore, structural design in this disclosure has still increased the drive current of thin-film transistor when driving simultaneously, and effectual improvement folding panel is showing the unusual problem of display such as the easy formation display stripe in the display process, has improved display quality.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some of the disclosed embodiments, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a prior art display panel;
FIG. 3 is a schematic diagram illustrating a structure of a thin film transistor in a display panel according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another thin film transistor according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are merely illustrative of some, but not all embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any inventive step, are intended to be within the scope of the present disclosure.
As the types of display devices increase, the foldable panels are increasingly applied to various types of display devices. The folding panel needs to be bent for multiple times in the using process, so that the requirement on the bending performance of the folding panel is high, and the mobility of a thin film transistor in the panel is changed and the leakage current of the thin film transistor is reduced due to the fact that the panel bears bending stress for a long time after the folding panel is folded for multiple times in the prior art, so that the problem of abnormal display of a bending area is finally caused.
Fig. 1 shows a display panel, and fig. 1 is a schematic plan view of the display panel according to the embodiment of the present disclosure. The display panel 10 includes a flat display region 11 and a bending region 12, and the bending region 12 may be adjacent to the flat display region. In the embodiment of the present disclosure, a plurality of bending regions 12 and a planar display region 11 may be disposed.
When the display panel is bent, the bending region 12 is bent along the bending axis 13, in the embodiment of the present disclosure, the two flat display regions 11 on two sides of the bending region 12 are bent inward, so that the area of the whole panel is reduced.
The plurality of bending regions 12 and the flat display region 10 may be disposed at intervals, and specifically, may be disposed according to design requirements of an actual product.
A plurality of pixel driving circuits are respectively arranged in the substrates corresponding to the flat display area 11 and the bending area 12, each pixel driving circuit corresponds to a different pixel unit, and the pixel driving circuits respectively drive the different pixel units to enable the pixels in the pixel units to normally emit light.
As shown in fig. 2, fig. 2 is a schematic diagram of a display panel in the prior art. The display panel includes data lines 100 and scan lines 101. The data lines 100 and the scan lines 101 are arranged in an array on a substrate of the display panel, the data lines 100 and the scan lines 101 form pixel units 102 in intersecting areas, and the pixel units 102 are correspondingly provided with driving circuits 103.
In the existing design, because the width-length ratio and the middle-length ratio of the driving thin film transistor are usually large, and are generally 3um/30um, when a driving circuit is designed, the structure of the corresponding thin film transistor in each pixel unit 102 is set to be a U-shaped structure, however, the thin film transistor of the U-shaped structure is already bent, when the display panel is folded, the thin film transistor is bent again, and then the thin film transistor in the region bears larger stress, and finally the performance of the thin film transistor is affected.
In order to improve and solve the problem that the tft is greatly affected by the folding in the folding area, a new structural design is provided in the present disclosure, as shown in fig. 3, and fig. 3 is a schematic structural diagram of the tft in the display panel provided in the present disclosure.
The thin film transistor includes a substrate base plate, and a pixel driving circuit disposed on the substrate base plate. The pixel driving circuit in the embodiment of the present disclosure takes a thin film transistor in a bending region of a display panel as an example, the pixel driving circuit corresponds to a plurality of pixel units, and the thin film transistors are correspondingly disposed in the pixel units.
Specifically, the thin film transistor includes a source electrode 300, a drain electrode 301, and an active layer 306.
In the embodiment of the present disclosure, a gate electrode 303 of a thin film transistor is further included. In order to reduce the stress of the thin film transistor in the bending area in the bending process of the folding panel, when the thin film transistor is arranged, the arrangement direction of the corresponding thin film transistor in the bending area is parallel to or the same as the direction of the bending axis of the bending area.
Preferably, when the channel region 305 corresponding to the active layer 306 of the thin film transistor is disposed, the channel direction of the channel region 305 is set to be the same as the direction of the bending axis, so that the whole thin film transistor is guaranteed to bear a smaller stress when being bent, thereby prolonging the service life of the thin film transistor.
Further, in the embodiment of the present disclosure, the gate 303 of the thin film transistor further includes a main gate 304 and a plurality of branch gates, wherein the plurality of branch gates are electrically connected to the main gate 304.
In the embodiment of the present disclosure, three branch gates are preferred, that is, a plurality of branch gates includes a first branch gate 3041, a second branch gate 3042 and a third branch gate 3043.
A gap is disposed between the first branch gate 3041 and the second branch gate 3042 and the third branch gate 3043, and the distances between the gaps may be the same, that is, the branch gates are disposed at equal intervals.
In the embodiment of the present disclosure, a gate insulating layer, which is not shown, is further disposed between the gate 303 and the active layer 306.
And orthographic projections of the source electrode 300 and the drain electrode 301 of the thin film transistor on the substrate partially overlap the active layer 306 to form a source region and a drain region on the active layer 306, since the gate electrode 303 includes a plurality of branch gate electrodes, a channel region 305 is formed on the active layer 306 at a region where the active layer 306 intersects orthographic projections of the plurality of branch gate electrodes on the substrate. Thus, the source 300, the drain 301, the gate 303 and the active layer 306 of the thin film transistor in the embodiment of the disclosure may form six sub-thin film transistors T1-1, T1-2, T1-3, T2-1, T2-2 and T2-3 connected in parallel, wherein the sub-thin film transistors corresponding to two rows above and below the active layer 306 share the same branch gate, and T1-1 and T2-1 share the same branch gate.
As shown in fig. 4, fig. 4 is a schematic structural diagram of another thin film transistor according to an embodiment of the disclosure. When the first branch gate 3041, the second branch gate 3042 and the third branch gate 3043 are disposed, the gate width of each branch gate may be the same, and the width of the channel region 400 formed by the intersection of each branch gate and the corresponding active layer 306 may be the same. Meanwhile, the distance D between two adjacent branch grid electrodes is the same, so that the preparation process is simplified, and the production efficiency of the panel is improved.
In conjunction with the schematic structure shown in fig. 3, the active layer 306 of the tft is divided into two segments in the vertical direction shown in the figure, and the width of each segment is the same, in this case, the width of the channel region of each sub tft is the same, so that the uniformity of each sub tft is better when operating, and meanwhile, the width of the channel region corresponding to different sub tfts can be set according to the requirement of the actual product.
Since the sub-tfts are connected in parallel, and each sub-tft is connected to the main gate 304 through a corresponding branch gate, the voltages on the branch gates are the same when the display panel normally emits light.
Meanwhile, each sub-tft is connected to a red sub-pixel, a blue sub-pixel and a green sub-pixel in the pixel unit, preferably, the pixel unit further includes a white sub-pixel unit to drive the sub-pixels of different colors to emit light, and the display effect of the sub-pixels is different because the sub-pixels emit light with different colors having different lifetimes.
In order to ensure the consistency of the light-emitting effect, different driving currents can be respectively provided for different grid branches, so that the problem of thin film transistor leakage current is solved, the stability of a display picture of a pixel unit during normal light-emitting is ensured, and meanwhile, because the sub-thin film transistors are in parallel connection, the driving current is effectively increased, and the light-emitting effect is improved.
In order to ensure the connection effect of the electrodes, in the embodiment of the present disclosure, the gate 303 of the thin film transistor is adjacent to each pixel unit. When a white sub-pixel is further included in the pixel unit, the gate 303 is set to be four branched gates spaced in parallel.
Preferably, the display device includes the display panel provided by the embodiment of the present disclosure, the display device may be a folding device, the display panel may normally emit light for display during folding, and the bending stress applied to the thin film transistor corresponding to the folding region in the panel is small.
The display device includes, but is not limited to, wearable devices, mobile devices, tablet computers, digital products, and the like, and the thin film transistor in the above embodiment is described as a parallel connection of six sub-thin film transistors, but is not limited to the above structure.
The display panel and the display device provided by the embodiments of the present disclosure are described in detail above, and the description of the embodiments is only used to help understanding the technical solution and the core idea of the present disclosure; those of ordinary skill in the art will understand that: it is to be understood that modifications may be made to the arrangements described in the embodiments above, and such modifications or alterations may be made without departing from the spirit of the respective arrangements of the embodiments of the present disclosure.
Claims (10)
1. A display panel comprising a bend region and a non-bend region adjacent to the bend region, the display panel comprising:
a substrate; and
a pixel driving circuit disposed on the substrate;
the pixel driving circuit comprises a plurality of thin film transistors, and the arrangement direction of the thin film transistors corresponding to the bending region is parallel to the bending axis of the bending region.
2. The display panel according to claim 1, wherein a channel direction of the thin film transistor corresponding to the bending region is the same as a direction of the bending axis.
3. The display panel according to claim 1, wherein the gate of the thin film transistor corresponding to the bending region comprises a plurality of branch gates.
4. The display panel according to claim 1, wherein the voltages of the branch gates of the corresponding thin film transistors in each pixel unit are the same, and the currents of the branch gates are different.
5. The display panel according to claim 3, wherein the gate of the thin film transistor is close to the pixel unit and the branch gates are three branch gates.
6. The display panel according to claim 3, wherein adjacent ones of the branch gates are spaced apart.
7. The display panel according to claim 6, wherein the distance of the interval between each of the branch gates is the same.
8. The display panel according to claim 1, wherein the thin film transistors corresponding to the bending regions are arranged in parallel.
9. The display panel according to claim 1, wherein the pixel driving circuit corresponds to a plurality of pixel units, and each pixel unit includes a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a white sub-pixel.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010590131.5A CN111754873A (en) | 2020-06-24 | 2020-06-24 | Display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010590131.5A CN111754873A (en) | 2020-06-24 | 2020-06-24 | Display panel and display device |
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| CN111754873A true CN111754873A (en) | 2020-10-09 |
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| CN202010590131.5A Pending CN111754873A (en) | 2020-06-24 | 2020-06-24 | Display panel and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112420793A (en) * | 2020-11-18 | 2021-02-26 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| WO2023098176A1 (en) * | 2021-11-30 | 2023-06-08 | 荣耀终端有限公司 | Display screen, electronic device, and method for manufacturing display screen |
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| CN110299385A (en) * | 2019-06-17 | 2019-10-01 | 云谷（固安）科技有限公司 | The production method of display device and its display panel, display panel |
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| CN108122930A (en) * | 2016-11-30 | 2018-06-05 | 乐金显示有限公司 | Thin film transistor (TFT) and the display panel using the thin film transistor (TFT) |
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| CN112420793A (en) * | 2020-11-18 | 2021-02-26 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| WO2023098176A1 (en) * | 2021-11-30 | 2023-06-08 | 荣耀终端有限公司 | Display screen, electronic device, and method for manufacturing display screen |
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Application publication date: 20201009 |