CN114420049A

CN114420049A - Ultra-narrow frame structure of display screen

Info

Publication number: CN114420049A
Application number: CN202210066472.1A
Authority: CN
Inventors: 汪锐; 向勇; 胡潇然; 张千
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-04-29

Abstract

The invention belongs to the technical field of organic light-emitting display, and particularly relates to an ultra-narrow frame structure of a display screen. The layout hierarchy from the AA area to the PNL edge is as follows: AA-Vinit-VSS-binding area-X-Panel Edge. The foldable area is added in the side edge of the display screen, the driving circuit X is arranged between the folding area and the PNL edge, the X is folded to the back surface of the PNL through the folding area after the display panel PNL is finished, the size of the X is not limited by the size of a PNL frame any more, the whole plane area of the PNL is not occupied, and the purpose of reducing the frame is achieved. Under the condition of the same circuit width, the size of the frame can be greatly reduced, and the reduction amplitude reaches 40%. In the high-frequency design, in order to increase the driving frequency, the size of the driving circuit X needs to be greatly increased, so that the technical scheme of the invention can ensure that the frame is not influenced even if the size of the driving circuit X is greatly increased. The problem that the existing narrow-frame display screen is attractive and cannot be well combined with functions is effectively solved.

Description

Ultra-narrow frame structure of display screen

Technical Field

The invention belongs to the technical field of organic light-emitting display, and particularly relates to an ultra-narrow frame structure of a display screen.

Background

In the display field, a narrow-bezel display screen has become a main development trend of a high-quality display screen due to the advantages of simplicity, attractiveness, large visible area with the same size and the like. At present, in general display screens in the market, particularly AMOLED NB (notebook computer) and vehicle-mounted products, because resolution is improved, display size is increased, and brightness is improved, a frame drives a GOA (gate on array, a gate driving circuit is on an array substrate and can be simply called as a gate driving circuit) to increase size correspondingly, so that a screen body with a larger size is driven; at this time, the corresponding VSS (low level signal) trace width is also large, and the size increase of GOA and VSS contradicts the narrow frame, so that the aesthetic function cannot be considered.

At present, products such as NB, vehicle-mounted and mobile phones all require narrow frames, and comprehensive screen visual experience is promoted. Application scenarios will typically require a Border Size (distance between display area boundary and panel boundary) of 2.0mm or less, or a 1.5mm Border Border. Because GOA is required to exist for driving limitation, and VSS routing width is required to be large enough for overlapping limitation of VSS, the frame cannot be compressed; therefore, the increase of the sizes of the GOA and VSS wirings contradicts the requirement of a narrow frame, so that the appearance and the function cannot be considered at the same time.

Disclosure of Invention

Aiming at the problems or the defects, the invention provides a design scheme of an ultra-narrow frame, which is applied to the design of the narrow frame of an AMOLED (active matrix organic light emitting diode panel) in order to solve the problem that the existing narrow frame display screen cannot well give consideration to both the beauty and the function.

A display screen ultra-narrow frame structure is provided, wherein the layout hierarchy from an AA area to a PNL edge is as follows: AA-Vinit-VSS-binding area-X-Panel Edge.

AA is a display area, Vinit is an initialization signal, VSS is a low level signal, bendarea is a bending area, X is a driving circuit, Panel Edge is a Panel Edge, and PNL is a display Panel.

The marking area is a bendable area added in the side Edge of the display screen, the X is arranged between the marking area and the Panel Edge, the X is folded to the back of the PNL through the marking area after the display Panel PNL is finished, the size of the X is not limited by the size of the frame of the PNL any more, the whole plane area of the PNL is not occupied, and the purpose of reducing the frame is achieved.

Further, the initialization signal Vinit and the low-level signal VSS are routed in the AA area, and the narrow frame layout is AA-bundling area-X-Panel Edge.

Further, the driving circuit X is a GOA frame driver or a Gate IC Gate integrated circuit driver.

In summary, in the invention, the bendable surface area is added in the side edge of the display screen, the driving circuit X is arranged between the bending area and the side edge of the PNL, and the X is folded to the back side of the PNL through the bending area after the display panel PNL is finished, so that the size of the X is not limited by the size of the frame of the PNL any more, the whole plane area of the PNL is not occupied, and the purpose of reducing the frame is achieved. Under the condition of the same circuit width, the size of the frame can be greatly reduced, and the reduction amplitude reaches 40%. In the high-frequency design, in order to increase the driving frequency, the size of the driving circuit X needs to be greatly increased, so that the scheme of the invention can ensure that the size of the driving circuit X does not influence the frame even if the size of the driving circuit X is greatly increased. The problem that the existing narrow-frame display screen is attractive and cannot be well combined with functions is effectively solved.

Drawings

FIG. 1 is a prior art AMOLED product frame design;

FIG. 2 is a cross-sectional view of a conventional AMOLED product frame design;

FIG. 3 is a plan view of example 1;

FIG. 4 is a cross-sectional view of the product frame design of example 1;

FIG. 5 is a plan view of the embodiment 1 after bending;

FIG. 6 is a cross-sectional view of the frame of the design of example 1 after bending;

FIG. 7 is a plan view of embodiment 2;

fig. 8 is a schematic view of the frame of embodiment 2 after bending.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The common process flow of the OLED backplane (LTPS is an example) is as follows: buffer Layer → Poly low-temperature polysilicon → GIGate interlayer dielectric → Gate1 (Gate) → Cst (storage capacitor) dielectric → Gate2 (Cst forming) → ILD (insulating Layer) → SD → PLN (flat Layer) → cathode → PDL (Pixel defined Layer) → PS (Photo Spacer formed Spacer by exposure).

As shown in fig. 1, the conventional peripheral circuit and frame of the AMOLED are generally large and cannot meet the requirements of beauty and function. For example, FIG. 2 is a cross-sectional view of a conventional AMOLED product frame design, wherein the frame design is AA-Vinit 100um, Vinit-GOA 1100um, GOA-VSS 1000um, and Vss-panel 400um, and the frame design reference is 2500 um; this design is large.

Example 1:

fig. 3 is a design scheme of this embodiment: and rearranging GOA, Vinit and VSS wires, and adding bundling area wire layout in the side edges. The GOA can be folded back to the back of the PNL after the panel is finished, and the plane space of the PNL is not occupied. The purpose of reducing the frame is achieved. The layout hierarchy from the AA area to the PNL edge is as follows: AA-Vinit-VSS-marking area-GOA-Panel Edge.

Fig. 4 is a cross-sectional view of the product frame design of the present embodiment, where the specific circuit parameters are as follows: AA-Vinit 100um, Vinit-VSS 1000um, VSS-bonding area 1000um, bonding area-GOA is 1100um, GOA-Panel edge is 400um, then the frame designed in this embodiment is 3500um before Bending, i.e. under the flattening state.

Fig. 5 is a plan view after Bending of the design scheme of this embodiment, that is, a bonding area trace layout is added to a side edge, and the plan view after Bending is performed. Fig. 6 is a cross-sectional view of the frame of the design of the present embodiment after bending, and the specific parameters thereof are as follows: AA-Vinit 100um, Vinit-VSS 1000um, the plane size of the bending region is 400um, namely the total size is 1500um under the bending state, thereby achieving the effect of narrow frame. The size of 1000um is saved to the 2500um frame of relatively ordinary design.

Example 2:

like embodiment 1, Gate IC, Vinit, VSS traces are rearranged, and bonding area trace layout is added in the side, X is also applicable to Gate IC driven products, and the influence of the bent IC on the left and right frames is eliminated, so that narrow frame products can be achieved. For some on-board-sized products, the use of ICs may require greater reliability than with GOAs. Fig. 7 is a plan view of embodiment 2, and fig. 8 is a schematic view of embodiment 2 after bending the frame. And the bent Gate IC circuit is arranged behind the display panel, so that the frame is reduced.

As can be seen by the above examples: the design of the invention does not add an exposure process flow and adds an MDL bonding process, namely bonding of the left and right frames. The design of the invention is adopted: taking the data described in the embodiments as reference, the frame can be reduced from 2500 to 1500um with a reduction of 40% with the same circuit width. Moreover, the design width of the subsequent driving circuit X (GOA frame driving or Gate IC Gate integrated circuit driving) will not be a bottleneck, and in high frequency design, the GOA size needs to be greatly increased in order to increase the driving frequency, so the invention will not affect the frame even if the GOA size is greatly increased.

Claims

1. The utility model provides a super narrow frame structure of display screen which characterized in that:

the layout hierarchy from the AA area to the PNL edge is as follows: AA-Vinit-VSS-marking area-X-Panel Edge; AA is a display area, Vinit is an initialization signal, VSS is a low level signal, bendarea is a bending area, X is a driving circuit, Panel Edge is a Panel Edge, and PNL is a display Panel;

the marking area is a bendable area added in the side Edge of the display screen, the X is arranged between the marking area and the Panel Edge, and the X is folded to the back of the display Panel PNL through the marking area after the PNL is finished.

2. The ultra-narrow bezel structure of claim 1, wherein:

the initialization signal Vinit and the low level signal VSS are arranged in the AA area, and the narrow frame layout is AA-bundling area-X-Panel Edge.

3. The ultra-narrow bezel structure of claim 1, wherein: the driving circuit X is driven by a GOA frame or a Gate IC Gate integrated circuit.