Transflective Pixel Floating Electrode Storage Capacitor
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Solution Overview
Problem
Transflective LCDs with dual cell gaps face issues of inconsistent liquid crystal rubbing and uneven electric fields due to tapers at electrode junctions, leading to light leakage and reduced aperture ratio, while those with single cell gaps struggle to maintain balanced transmittance between reflective and transmissive areas, resulting in suboptimal display quality.
Innovation Solution
A transflective pixel structure comprising an active device, storage capacitor, transparent electrode, and first reflective electrode, where the first reflective electrode is disposed above the storage capacitor and electrically connected to the floating electrode, with dielectric layers and a planar layer ensuring the electrodes are in the same plane, allowing adjustment of the overlapping area to match transmittance between reflective and transmissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dual cell gap structure is used to improve transmittance balance, then transmittance of reflective area improves, but electrode junction tapers cause inconsistent rubbing and uneven electric fields
Solution Approach 1:
The patent applies local quality by creating different cell gap configurations in different areas: the reflective area has a first cell gap while the transmissive area has a second cell gap. This allows each area to have optimized local properties - the reflective area achieves proper transmittance balance while avoiding the taper problems at electrode junctions by using a single cell gap structure.
Solution Approach 2:
The patent segments the display panel into distinct reflective and transmissive areas with different cell gap structures. By dividing the cell gap configuration into separate regions (first cell gap for reflective area, second cell gap for transmissive area), the patent avoids the electrode junction taper problems that occur in dual cell gap designs while maintaining the benefits of both reflective and transmissive modes.
2Device complexity
If single cell gap structure is used to simplify electrode configuration, then manufacturing complexity reduces, but transmittance balance between reflective and transmissive areas deteriorates
Solution Approach 1:
The patent uses local quality by assigning different cell gap values to different functional areas. The reflective area uses a first cell gap optimized for reflection, while the transmissive area uses a second cell gap optimized for transmission. This local differentiation allows each area to achieve its optimal transmittance characteristics without requiring complex dual cell gap structures throughout the entire panel.
3Illumination intensity
If electrode overlapping area is increased to improve transmittance balance, then transmittance uniformity improves, but aperture ratio decreases
Solution Approach 1:
The patent applies local quality by optimizing the electrode overlapping area separately for reflective and transmissive regions. In the reflective area, the first reflective electrode overlaps with the common electrode to achieve proper transmittance balance, while in the transmissive area, the transparent electrode configuration is optimized independently. This localized optimization allows each area to achieve transmittance uniformity without unnecessarily reducing the overall aperture ratio.
Data Source
AI summary
A transflective pixel structure is provided. The transflective pixel structure includes an active device, a storage capacitor, a transparent electrode, and a first reflective electrode. The storage capacitor includes a bottom electrode, a floating electrode, and an upper electrode. The upper electrode is disposed above the bottom electrode and the floating electrode and electrically connected to the active device. The transparent electrode is electrically connected to the upper electrode. The first reflective electrode is electrically connected to the floating electrode and electrically insulated from the transparent electrode. As mentioned above, the transflective pixel structure can improve the image quality of a transflective liquid crystal display panel with single cell gap.