IPS LCD Common Electrode Segmentation for Touch Integration
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Solution Overview
Problem
The existing liquid crystal display devices of IPS mode with integrated touch panels face challenges in maintaining a high pixel aperture ratio and simplifying the manufacturing process due to complex wiring requirements and the need to prevent short-circuits between common electrodes with different signals.
Innovation Solution
The solution involves dividing the pixel regions into areas where either the pixel electrode or the common electrode is formed closer to the liquid crystal layer, allowing both to be in the same layer, and using drive electrode wirings to connect touch drive block electrodes without contact holes, thereby simplifying the manufacturing process and maintaining a high pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrodes are divided into multiple touch regions with different signals, then touch detection functionality is improved, but wiring complexity increases and pixel aperture ratio decreases
Solution Approach 1:
The common electrode is designed to serve dual functions: it acts as a common electrode for display operation and simultaneously functions as both touch drive electrode and touch detect electrode. This multi-functionality eliminates the need for separate touch electrode structures, thereby reducing wiring complexity while maintaining touch detection capability.
Solution Approach 2:
The common electrode is divided into multiple regions (first common electrode region and second common electrode region) that correspond to different touch detection zones. This segmentation allows different signal applications in different regions while using the same electrode layer, enabling touch functionality without increasing overall device complexity.
2Adaptability or versatility
If common electrodes are divided into multiple touch regions with different signals, then touch detection functionality is improved, but pixel aperture ratio decreases
Solution Approach 1:
The common electrode performs multiple functions (display common electrode and touch detection electrode) within the same structural layer, eliminating the need for additional electrode layers that would reduce the pixel aperture ratio. This maintains high light transmission while enabling touch functionality.
Solution Approach 2:
The touch detection electrode function is merged with the common electrode structure. By combining these functions in the same layer rather than adding separate structures, the pixel aperture ratio is preserved while achieving touch detection capability.
3Adaptability or versatility
If different signals are applied to common electrodes in the same layer, then multiple functions are achieved, but short-circuit prevention becomes more difficult
Solution Approach 1:
The common electrode is segmented into distinct regions (first and second common electrode regions) that are spatially separated and assigned different signal types. This segmentation naturally prevents short-circuits by providing physical isolation between areas with different electrical potentials, while still allowing multiple signal applications.
Data Source
AI summary
A liquid crystal display device includes a plurality of pixel regions divided into a plurality of areas. The plurality of areas include a plurality of first areas and a plurality of second areas. In each of the pixel regions in each of the first areas, one of (i) the pixel electrode and (ii) the common electrode is formed closer to the liquid crystal layer than the other of (i) the pixel electrode and (ii) the common electrode. In each of the pixel regions in each of the second areas, the other of (i) the pixel electrode and (ii) the common electrode is formed closer to the liquid crystal layer than the one of (i) the pixel electrode and (ii) the common electrode. The common electrode in each of the first areas is formed in a same layer as the pixel electrode in each of the second areas.