Display Panel Extended Light Blocking Portions Bright Dot Defects
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Solution Overview
Problem
In liquid crystal display devices, the presence of extended light blocking portions can lead to a decrease in brightness, especially when pixels with spacers have rubbed-off bits causing bright dot defects, and result in unevenness between pixels with and without spacers.
Innovation Solution
The configuration includes extended light blocking portions that extend to the inner sides of first pixel units adjacent to spacers, reducing the visibility of bright dot defects and maintaining a higher aperture ratio for second pixel units without these extensions, thereby minimizing brightness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extended light blocking portions are added to pixel units adjacent to spacers, then bright dot defects become less visually perceivable, but the aperture ratio of those pixel units decreases
Solution Approach 1:
The patent applies local quality by selectively adding extended light blocking portions only to first pixel units adjacent to spacers, while leaving second pixel units without spacers unchanged. This localized modification addresses bright dot defects only where they occur (near spacers) without unnecessarily reducing the aperture ratio of all pixel units. The extended light blocking portions are positioned to cover areas where rubbed-off bits from spacers may land, providing defect prevention precisely where needed.
2Manufacturing precision
If spacers are disposed between substrates to maintain cell gap, then cell gap uniformity is improved, but bright dot defects occur due to rubbed-off bits from spacer friction
Solution Approach 1:
The patent converts the harmful effect of spacer friction (which causes bright dot defects) into a beneficial arrangement by positioning extended light blocking portions in the friction paths of spacers. The rubbed-off bits from spacers, which would normally create visible defects on pixel surfaces, are instead directed onto the extended light blocking portions where they are hidden from view. This transforms the harmful friction into a controlled process that does not degrade display quality.
3Ease of manufacture
If extended light blocking portions are randomly arranged, then spacer positioning is simplified, but brightness uniformity across different color pixels deteriorates
Solution Approach 1:
The patent applies asymmetry by creating an asymmetric arrangement where extended light blocking portions are selectively placed only on first pixel units (red and blue pixels) adjacent to spacers, while second pixel units (green pixels) without spacers remain without extended portions. This asymmetric configuration accounts for the different spacer arrangements and brightness characteristics of different color pixels, maintaining brightness uniformity across the display while simplifying spacer positioning.
Data Source
AI summary
A display panel includes two substrates, pixel units arranged in rows and columns on the substrates and at least including first pixel units adjacent to each other and a second pixel unit having a different color from the first pixel units and being configured to provide a brighter display than the first pixel units when the first pixel units and the second pixel unit are at the same gray level, an inter-pixel light blocking portion disposed on at least one of the two substrates and separating the pixel units adjacent to each other, a spacer overlapping the inter-pixel light blocking portion at a position adjacent to at least one of the first pixel units and disposed between the two substrates to keep a distance between the two substrates, and extended light blocking portions extending from the inter-pixel light blocking portion to inner sides of the first pixel units.