Display Panel Light-Blocking Pattern for Luminance Uniformity
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Solution Overview
Problem
Liquid crystal display (LCD) panels face reduced image quality due to limited viewing angle and luminance differences between pixels, particularly in the patterned vertical alignment (PVA) mode, where the last horizontal row of pixels appears brighter than the rest, affecting overall image quality.
Innovation Solution
The implementation of a display panel design with a first and second pixel electrode configuration, including a light-blocking pattern on the second pixel electrode to equalize luminance, and a method for manufacturing a display substrate with specific transistor switches and capacitors to manage voltage distribution across pixels, thereby reducing luminance differences between rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a patterned vertical alignment (PVA) mode is used to improve viewing angle, then the viewing angle is improved, but the pixels in the last horizontal row become brighter than the remaining pixels, reducing image quality
Solution Approach 1:
The patent applies local quality by introducing a light-blocking pattern specifically in the last horizontal row of pixels. This localized modification blocks light transmission in the problematic area (last row) while leaving other rows unchanged, thereby equalizing the luminance across all rows without affecting the PVA mode's viewing angle improvement in other areas.
2Ease of manufacture
If the last horizontal row of pixels is left without additional structures, then the manufacturing process is simple, but the pixels in this row appear brighter than the rest, reducing overall image quality
Solution Approach 1:
The light-blocking pattern is applied locally only to the last horizontal row of pixels, making the manufacturing process minimally more complex while achieving the desired luminance uniformity. This localized approach adds only one additional patterning step for a specific region rather than requiring global modifications to all pixels.
Data Source
AI summary
A display panel includes n gate lines, a data line, a first pixel and a second pixel. The gate lines extend in a first direction. The data line extends in a second direction transverse to the first direction. The first pixel includes a first pixel electrode connected to one of the (n−1) gate lines to receive a data voltage through the data line. The second pixel includes a second pixel electrode and a light-blocking pattern. The second pixel electrode is connected to the (n)-th gate line to receive the data voltage through the data line. The first light-blocking pattern overlaps with the second pixel electrode to possibly reduce a luminance difference between the first and second pixels.