Bent Display Substrate Edge Area for Narrow Bezel Design
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Solution Overview
Problem
Existing touch screen display devices have poor display effects and limited operation space due to wide bezels, which reduce the display area and impair hand-held operation, as the row driving circuit accounts for a large proportion of the bezel width and compressing it affects the driving capability.
Innovation Solution
A display substrate with a bent portion between the display area and the edge area, where the edge area is bent at a predetermined angle away from the display surface, allowing the row driving circuit to be positioned on the back surface, reducing the bezel width without compromising driving capability, and using a conductive layer for electrical connection between the pixel and row driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the row driving circuit is placed in the edge area to drive the display, then the display function is achieved, but the bezel width increases reducing the screen ratio
Solution Approach 1:
The patent bends the edge area containing the row driving circuit away from the display surface by 90 degrees, transitioning the circuit placement from a two-dimensional plane to a three-dimensional structure. This allows the driving circuit to be positioned on the back surface of the substrate, effectively removing it from the lateral bezel space and enabling narrow bezel design while maintaining full display area.
Solution Approach 2:
The patent introduces a conductive layer as an intermediary to bridge the pixel circuit in the display area and the row driving circuit in the bent edge area. This conductive layer passes through the bending region, enabling electrical connection between circuits separated by the 90-degree bend, thus solving the connectivity problem introduced by the dimensional change.
2Length of stationary object
If the row driving circuit is compressed to reduce bezel width, then the bezel becomes narrower, but the driving capability deteriorates
Solution Approach 1:
By bending the edge area 90 degrees away from the display surface, the patent provides sufficient space for the row driving circuit to maintain its original size and layout without compression. The circuit is positioned on the back surface of the substrate, allowing output TFTs to achieve proper dimensions (e.g., 10-15 μm width) and ensuring adequate driving capability while achieving narrow bezel width.
3Length of stationary object
If the edge area is bent away from the display surface, then the bezel width is reduced, but the electrical connection between pixel circuit and row driving circuit becomes complex
Solution Approach 1:
The patent uses a conductive layer as an intermediary element that spans the bending region. This conductive layer is configured to pass through the bent portion, establishing electrical connection between the pixel circuit in the display area and the row driving circuit in the bent edge area. This intermediary approach simplifies the overall connection structure compared to alternative solutions that would require complex wiring around the bend.
Solution Approach 2:
The conductive layer is implemented as a thin film structure that can accommodate the 90-degree bending of the edge area. This flexible thin film approach allows the electrical connection to maintain integrity through the bent region without requiring rigid or complex connection structures.
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate, a manufacturing method thereof, and a display device. The display substrate includes: a display area; an edge area; a bent portion between the display area and the edge area, the edge area being bent at a predetermined angle towards a side facing away from a display surface of the display area by means of the bent portion; and a row driving circuit in the edge area.