Display Substrate Flatness via Localized Compensation Layer
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Solution Overview
Problem
The difference in pixel area between sub-display panels of varying sizes leads to excessive material variation, resulting in uneven thickness and reduced flatness of display substrates due to inconsistent display layer heights.
Innovation Solution
A display substrate design featuring an underlay substrate with a limiting layer comprising first and second limiting portions, and corresponding display portions, where the gap between first limiting portions is greater than that of second limiting portions, ensuring a controlled height difference between display portions to enhance flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same display layer manufacturing process is used for sub-display panels of different sizes, then manufacturing simplicity is maintained, but the thickness difference between display layers becomes excessive, reducing substrate flatness
Solution Approach 1:
The patent applies local quality by introducing a compensation layer selectively at specific locations (where second display portions will be formed) rather than uniformly across the entire substrate. This localized approach allows the display layer thickness to be compensated where needed, achieving uniform final thickness without modifying the overall manufacturing process for all panels.
Solution Approach 2:
The compensation layer is formed in advance before the display layer is deposited. This preliminary action pre-compensates for the thickness difference that will occur due to varying pixel areas, ensuring that when the display layer is added, the final thickness is uniform across different sub-display panel sizes.
2Area of stationary object
If larger pixel areas are used in sub-display panels, then display coverage is improved, but more display layer material is required, increasing layer thickness and reducing substrate flatness
Solution Approach 1:
The compensation layer is applied locally only in regions where smaller pixel areas will be formed, not uniformly across all pixels. This allows larger pixels to maintain their full area while smaller pixels receive additional thickness compensation, achieving uniform final thickness without reducing the area of larger display portions.
Solution Approach 2:
The patent introduces a vertical dimension solution (adding compensation layer thickness) to compensate for the horizontal dimension variation (pixel area differences). By adding material in the Z-direction rather than adjusting X-Y pixel dimensions, the solution maintains display area while achieving thickness uniformity.
Data Source
AI summary
An embodiment of the present invention discloses a display substrate and a display panel. The display substrate includes a plurality of first display portions each of which is disposed in a gap between adjacent two of first limiting portions; a plurality of second display portions each of which is disposed in a gap between adjacent two of second limiting portions. The gap between the adjacent two first limiting portions is greater than the gap between the adjacent two second limiting portions. A difference between a height of a top of each of the second display portions and a height of a top of each of the first display portions is less than a predetermined difference.