Thin Film Transistor Array Panel Light Blocking Member Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal displays (LCDs), the formation of color filters on thin film transistor array panels leads to light leakage due to abnormal distortion of LC molecules, which is exacerbated by the need to widen drain electrodes to block light leakage, thereby reducing the aperture ratio.
Innovation Solution
A thin film transistor array panel design that includes a light blocking member with specific configurations to enclose and expose regions of the drain electrode, improving the aperture ratio by reducing light leakage and maintaining the size of the drain electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the drain electrode is widened to block light leakage, then light leakage is reduced, but the aperture ratio deteriorates
Solution Approach 1:
The light blocking function is segmented from the drain electrode by introducing a separate light blocking member. This member is positioned between the color filter opening and the pixel electrode, specifically covering the region where light leakage occurs due to inclined color filter walls, without requiring the drain electrode to be widened.
Solution Approach 2:
A light blocking member is introduced as an intermediary element between the color filter and the pixel electrode. This member specifically blocks light leakage paths created by the inclined color filter walls, preventing light from reaching regions where it would cause display defects without interfering with the pixel electrode area.
2Manufacturing precision
If the color filter opening is aligned with the pixel electrode, then color display accuracy is improved, but light leakage increases due to inclined color filter walls
Solution Approach 1:
The light blocking member serves as an intermediary that specifically addresses the light leakage problem caused by inclined color filter walls. It is positioned to cover the lateral regions where light leakage occurs, allowing the color filter opening to maintain proper alignment with the pixel electrode for accurate color display.
Solution Approach 2:
The light blocking member is strategically positioned only in the regions where light leakage occurs (lateral regions near the color filter opening), rather than uniformly across the entire structure. This localized approach blocks light leakage while preserving the optical path for legitimate light transmission through the centered pixel electrode.
Data Source
AI summary
A thin film transistor panel includes a substrate, a gate line extending in a first direction on the substrate, a data line disposed on the substrate, the data line crossing the gate line with an insulation layer therebetween and extending in a second direction, a thin film transistor including a control terminal connected to the gate line, an input terminal connected to the data line, and an output terminal, a color filter disposed on the thin film transistor, the color filter having an opening corresponding to the output terminal of the thin film transistor, a light blocking member disposed in the opening of the color filter, the light blocking member exposing a first region of a first end portion of the output terminal of the thin film transistor and having an output terminal light blocking portion enclosing the circumference of the first region, and a pixel electrode disposed on the light blocking member and the color filter, the pixel electrode contacting the first region of the output terminal.