Thin Film Transistor Substrate Color Filter Integration
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Solution Overview
Problem
In liquid crystal displays, aligning pixel electrodes with color filters on different panels leads to alignment errors, and the presence of ions or impurities from the black matrix can adversely affect the liquid crystal, causing afterimages.
Innovation Solution
A thin film transistor array panel is designed with a substrate, gate and data lines, a thin film transistor, a light blocking member, a color filter, and a pixel electrode, where the light blocking member is formed on the non-display area, and the color filter covers the entire light blocking member, reducing the adverse impact on the liquid crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes and color filters are disposed on different display panels, then manufacturing is easier, but alignment accuracy deteriorates due to difficulty in aligning the pixel electrodes and color filters with each other
Solution Approach 1:
The patent combines the color filter and light blocking member into a single integrated structure formed on the same display panel as the pixel electrode. This merging eliminates the need for separate alignment between different panels, thereby resolving the contradiction between ease of manufacture and alignment accuracy by making both objectives achievable through integration.
Solution Approach 2:
The color filter structure is designed to serve multiple functions simultaneously: it acts as both a color filter for the pixel electrode and a light blocking member for the non-display area. This multi-functionality allows a single component to replace what would traditionally require separate components on different panels, improving alignment while maintaining manufacturing simplicity.
2Manufacturing precision
If the light blocking member is formed on the same display panel as the pixel electrode, then alignment accuracy improves, but liquid crystal quality deteriorates due to ions or impurities from the light blocking member causing afterimages
Solution Approach 1:
The patent introduces an intermediary structure between the light blocking member and the liquid crystal layer that prevents direct contact. This intermediary layer blocks ions and impurities from the light blocking member from reaching and degrading the liquid crystal, thereby resolving the contradiction between improved alignment and maintained liquid crystal quality.
Solution Approach 2:
The harmful ions and impurities are effectively extracted or isolated from the interaction with liquid crystal by positioning the light blocking member on a separate layer structure that prevents direct contact. This separation removes the harmful effect while preserving the alignment benefits of having the light blocking member on the same panel.
3Object-affected harmful factors
If the color filter covers the entire light blocking member of the non-display area, then liquid crystal quality improves by reducing adverse effects, but device complexity increases
Solution Approach 1:
The color filter is designed to extend over the entire light blocking member in the non-display area, serving dual purposes: maintaining color functionality in the display area and providing protection against ions and impurities in the non-display area. This multi-functional design improves liquid crystal quality without requiring additional separate components, thereby managing device complexity effectively.
Data Source
AI summary
A thin film transistor array panel includes: a substrate, a plurality of gate and data lines, a thin film transistor, a light blocking member, a color filter, and a pixel electrode. The substrate includes a display area having a plurality of pixels and a non-display area. The gate lines and data lines are formed on the substrate. The thin film transistor is connected to a respective gate line and data line of the plurality of gate and data lines. The light blocking member is formed on the non-display area, the gate line, the data line, and the thin film transistor. The color filter is formed on the light blocking member. The pixel electrode is formed on the color filter. The color filter covers the entire light blocking member of the non-display area.