Color Filter Substrate with Variable Aperture Ratio for OLED Uniformity
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Solution Overview
Problem
The IR drop in array substrates causes chroma and brightness differences in display panels, and thin film encapsulation leads to uneven colors, particularly a pink hue in the periphery, resulting in poorer uniformity of chroma and brightness.
Innovation Solution
A color filter substrate with a light-shielding layer featuring light-transmitting holes of varying sizes arranged in an array, with different aperture ratios in different regions to compensate for brightness and chroma variations, and an organic light-emitting display panel incorporating this substrate, a light-emitting functional layer, and a thin film encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform light-transmitting holes are used across the display panel, then manufacturing is simple, but IR drop causes chroma and brightness differences between different regions
Solution Approach 1:
The patent applies local quality by dividing the light-transmitting holes into different regions (first, second, third, and fourth regions) with different aperture ratios. The aperture ratio is adjusted according to the specific optical characteristics and IR drop characteristics of each region, allowing each local area to have optimized light transmission properties rather than using a uniform design across the entire panel.
2Device complexity
If standard aperture ratios are used in all regions, then device structure is simple, but thin film encapsulation causes uneven colors and pink hue in periphery regions
Solution Approach 1:
The patent implements local quality by assigning different aperture ratios to different regions of the light-transmitting holes. Specifically, the aperture ratios in the first, second, third, and fourth regions are differently configured to compensate for the color unevenness and pink hue issues caused by thin film encapsulation in peripheral areas, while maintaining a relatively simple overall device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the uniformity of chroma and brightness by gradually reducing the aperture ratio of the light-shielding layer from the upper side to the lower side, addressing IR drop-induced differences and encapsulation-related color issues.
Implementation Method 1
a light-shielding layer (5) defined with a plurality of light-transmitting holes (51) arranged in an array
Data Source
AI summary
A color filter substrate and an organic light-emitting display panel are disclosed. The color filter substrate is rectangular and has an upper side, a lower side, a left side, and a right side, wherein, the lower side corresponds to a driving chip of the organic light-emitting display panel. The color filter substrate includes a light-shielding layer defined with a plurality of light-transmitting holes arranged in an array, and from the upper side to the lower side, openings of the light-transmitting holes are gradually smaller. The present disclosure allows an aperture ratio of the light-shielding layer to be gradually reduced from the upper side that is away from the driving chip to the lower side that corresponds to the driving chip. Therefore, an area of the organic light-emitting display panel having uneven chroma and brightness can be compensated, thereby improving uniformity of the chroma and brightness.