Transflective LCD Pixel Voltage Control for Optical Consistency
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Solution Overview
Problem
Transflective Liquid Crystal Displays (LCDs) face challenges in achieving consistent optical characteristics between reflective and transmissive regions due to the need for different cell gaps, making the manufacturing process difficult and yield reduction.
Innovation Solution
A transflective LCD design with a single cell gap is achieved by dividing each pixel unit into two sub-pixels, each with a thin film transistor, liquid crystal capacitor, and storage capacitor, allowing for different pixel voltages to be generated for the reflective and transmissive regions through a specific drive method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different cell gaps are formed in reflective and transmissive regions to achieve optimal optical characteristics, then display performance is improved, but manufacturing complexity increases and yield decreases
Solution Approach 1:
The patent applies local quality by providing different voltage adjustments to different regions of the same cell gap. The reflective region receives a first voltage adjustment while the transmissive region receives a second voltage adjustment, allowing each region to have optimized optical characteristics despite sharing the same physical cell gap structure. This resolves the contradiction by maintaining structural simplicity while achieving regional optimization.
2Manufacturing precision
If different cell gaps are formed in reflective and transmissive regions, then optical characteristics are optimized, but manufacturing difficulty increases
Solution Approach 1:
The patent merges the reflective and transmissive regions into a single uniform cell gap structure, eliminating the need for separate cell gap formation processes. By combining both regions under one structural framework and using voltage adjustments rather than physical structure changes, the manufacturing process is simplified while still achieving the desired optical characteristics in each region.
3Manufacturing precision
If different cell gaps are formed in reflective and transmissive regions, then display performance is improved, but production yield decreases
Solution Approach 1:
The patent changes the electrical parameters (voltage adjustments) rather than physical parameters (cell gap dimensions) to optimize optical characteristics. By using voltage control instead of physical structure modification, the manufacturing process becomes more robust and less prone to defects, thereby improving yield while maintaining the ability to optimize display performance in both reflective and transmissive regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the transmissive and reflective regions to have the same optical characteristics, simplifying the manufacturing process and improving display performance.
Implementation Method 1
a liquid crystal display device comprises a first pixel unit and a second pixel unit, wherein the first pixel unit corresponds to a reflective region and the second pixel unit corresponds to a transmissive region
Data Source
AI summary
The present invention provides a transflective LCD including a plurality of pixel units defined by scan lines and data lines. Each pixel unit includes two sub-pixels. Each sub-pixel includes a storage capacitor. The two storage capacitors are connected to different voltage sources and correspond to a reflection region and a transmission region in a pixel unit respectively to modify the pixel voltage.