Varying Pixel Electrode Slit Widths for LCD Viewing Angle Deviation
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Solution Overview
Problem
The 8K LCD device experiences significant viewing angle deviation due to the uniform widths of strip portions and slits in the 4-domain pixel electrode design, which negatively impacts display quality.
Innovation Solution
A pixel unit with four sub-pixel units, where the widths of the electrode portions, strip portions, and slits can vary differently in each position, allowing for distinct aperture ratio-voltage curves, thereby improving viewing angles. This design includes a main electrode with specific orientations and varying widths between 5-6 microns for electrode portions, 2-4 microns for strip portions, and 2-3 microns for slits, and angles between the slits and main electrodes of 35, 40, or 45 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the 4-domain pixel electrode design is adopted to raise the aperture ratio, then the aperture ratio is improved, but the viewing angle deviation becomes huge
Solution Approach 1:
The patent applies local quality by making the widths of strip portions and slits different at different positions within the pixel electrode. Specifically, the first strip portion has a different width than the second strip portion, and correspondingly the first slit and second slit have different widths. This local variation in dimensions allows different aperture ratios at different positions, which compensates for viewing angle deviations and improves overall display quality.
2Ease of manufacture
If the widths of strip portions and slits are made uniform, then the manufacturing process is simplified, but the viewing angle performance deteriorates
Solution Approach 1:
The patent applies parameter changes by varying the width parameters of strip portions and slits at different positions. The first strip portion width is different from the second strip portion width, and the first slit width is different from the second slit width. This parameter variation optimizes the aperture ratio at different positions to compensate for viewing angle effects, while still maintaining a relatively simple manufacturing process compared to more complex designs.
Data Source
AI summary
A pixel unit and an LCD device are disclosed. The pixel unit comprises four sub-pixel units. Each of the sub-pixel units comprises a pixel electrode, comprising a plurality of strip portions positioned at intervals. Two adjacent strip portions define a slit. One strip portion and one slit adjacent to the strip portion are defined as an electrode portion and a width of the electrode portion is a sum of a width of the slit and a width of the strip portion. The width of each of the electrode portions and/or the width of each of the strip portions and/or the width of each of the slits is different. Since the pixel electrodes in different positions have a different aperture ratio-voltage curve. This improves the viewing angle deviation of the four domain pixel electrode.