LCD Pixel Circuit Gate-Placed Discharging Capacitor Aperture Rate
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Solution Overview
Problem
Conventional liquid crystal display (LCD) designs with a discharging capacitor on the common electrode compromise the aperture rate and transmission rate, especially in high resolution and high pixel per inch (PPI) displays, due to the increased metal dimension to pixel dimension ratio.
Innovation Solution
A pixel circuit structure is introduced where the first discharging capacitor is arranged on the Gate, not occupying the aperture area, and a second discharging capacitor is configured between the drains of the main and allocation electrodes to maintain different potentials for the pixel electrodes, enhancing the aperture and transmission rates without affecting the wide viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the discharging capacitor is arranged on the common electrode, then the wide viewing angle compensation is achieved, but the aperture rate and transmission rate are decreased
Solution Approach 1:
The discharging capacitor is relocated from the common electrode plane to the gate electrode plane, utilizing a different spatial dimension in the circuit layout. This dimensional relocation allows the capacitor to be positioned in an area that does not encroach on the aperture region, thereby maintaining both viewing angle compensation and high aperture rate
Solution Approach 2:
The gate electrode serves as an intermediary structure that hosts the discharging capacitor. By using the gate electrode as the mounting location rather than the common electrode, the design achieves viewing angle compensation without sacrificing aperture area, as the gate region is separate from the light-transmissive aperture region
2Measurement precision
If the resolution and PPI are increased, then the display quality is improved, but the aperture rate and transmission rate are decreased
Solution Approach 1:
By relocating the discharging capacitor to the gate electrode plane, the design frees up aperture area that can be utilized even in high-resolution displays where pixel dimensions are reduced. This spatial reorganization allows maintaining high PPI while preserving sufficient aperture rate
Solution Approach 2:
The circuit elements are strategically positioned in specific local regions (gate electrode area) rather than being distributed across the common electrode area. This localized arrangement optimizes the use of available space within each pixel, allowing high resolution design without compromising the aperture rate
Data Source
AI summary
The present disclosure relates to a liquid crystal panel and the pixel circuit structure thereof. The pixel circuit structure includes at least one first scanning line, at least one second scanning line, and at least one data line. A source of the allocation electrode connects to the drain of the second pixel electrode, and a first discharging capacitor is arranged between the source and the first scanning line. With respect to the proposed pixel circuit structure, the wide viewing angle effect is not affected and the location of the first discharging capacitor is enhanced, i.e., the first discharging capacitor is arranged on the Gate. Thus, the first discharging capacitor has not occupied the aperture area, which greatly enhances the aperture rate and the transmission rate.