Transflective LCD Reference Voltage Lines for Display Optimization
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Solution Overview
Problem
Conventional transflective liquid crystal displays (TR LCDs) with single cell gap mode face challenges in simultaneously optimizing transmissive and reflective displaying effects due to mismatched characteristic curves, limiting them to specific panel-driving approaches and reducing design flexibility.
Innovation Solution
The TR LCD design incorporates a display panel with first and second reference voltage lines, allowing each row of pixels to receive different time-varying reference voltage signals, enabling the use of various panel-driving approaches such as row inversion, frame inversion, column inversion, and dot inversion, thereby optimizing both transmissive and reflective effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional TR LCD with single cell gap mode uses a single reference voltage line for all pixels, then the device complexity is reduced and manufacturing is simplified, but the transmissive and reflective displaying effects cannot be simultaneously optimized due to mismatched characteristic curves
Solution Approach 1:
The patent divides the pixel array into multiple pixel-groups (first pixel-group and second pixel-group) along the row direction, with each group receiving different reference voltage signals. This segmentation allows independent optimization of transmissive and reflective characteristic curves for different pixel groups, resolving the contradiction between manufacturing simplicity and displaying effect optimization.
Solution Approach 2:
Different pixel-groups are assigned different reference voltage signals (first reference voltage signal for odd pixel-groups, second reference voltage signal for even pixel-groups) to achieve locally optimized characteristic curves. This local quality approach enables each pixel-group to be tuned for optimal performance in its specific operating mode while maintaining overall system simplicity.
2Adaptability or versatility
If a TR LCD is designed to support multiple panel-driving approaches with different reference voltage signals, then the adaptability and design flexibility are enhanced, but the device complexity and circuit design become more complex
Solution Approach 1:
The patent introduces time-varying reference voltage signals that can be dynamically adjusted based on the selected panel-driving approach (row inversion, frame inversion, column inversion, or dot inversion). The reference voltage signals change over time and across different pixel-groups, providing dynamic adaptability while maintaining a relatively simple circuit structure compared to fully independent pixel control.
Data Source
AI summary
A transflective liquid crystal display (TR LCD) including a display panel, a first reference voltage line and a second reference voltage line is disclosed. The display panel includes: a plurality of scan lines; a plurality of data lines, disposed substantially perpendicularly to the scan lines; a plurality of pixels arranged in an array, respectively coupled to a corresponding data line and a corresponding scan line. Each pixel has a transparent area and a reflection area, and each row of pixels is divided by definition into a first pixel-group and a second pixel-group. The above-mentioned first reference voltage line and second reference voltage line are respectively coupled to the reflection areas of the pixels of the first pixel-group and the second pixel-group of each row of pixels for respectively receiving a first reference voltage signal and a second reference voltage signal, wherein both the reference voltage signals are time-varying or periodic.