Transreflective LCD Single Cell Gap Equalization
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Solution Overview
Problem
Transreflective LCD apparatuses with single cell gaps face challenges in equalizing electro-optical characteristics between transmissive and reflective regions, leading to increased power consumption and complexity in driving methods, particularly due to differences in gamma voltages and optical characteristics.
Innovation Solution
The implementation of a transreflective LCD apparatus with a single cell gap, utilizing first and second liquid crystal cells in transmissive and reflective regions, connected to thin film transistors and storage capacitors, where the capacitances and storage electrodes of these capacitors can differ, allowing for equalization of electro-optical characteristics through bootstrapping voltages applied by a storage line during specific voltage swings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single cell gap is used in transreflective LCD apparatus, then manufacturing complexity is reduced and yield is improved, but electro-optical characteristics in transmissive and reflective regions become difficult to equalize
Solution Approach 1:
The patent applies local quality by making the cell gap structure non-uniform: the reflective region has a first cell gap while the transmissive region has a second cell gap that is different from the first. This allows each region to have optimized optical characteristics suitable for its specific function, enabling equalization of electro-optical properties despite using a single cell gap structure overall.
2Manufacturing precision
If different gamma voltages are applied to transmissive and reflective regions, then electro-optical characteristics can be optimized, but device complexity and power consumption increase
Solution Approach 1:
The patent changes the physical parameter of cell gap distance to achieve electro-optical equalization. By setting the second cell gap in the transmissive region to be different from the first cell gap in the reflective region, the optical paths are equalized, allowing both regions to operate with the same gamma voltage and simplifying the driving method while maintaining optimized characteristics.
3Manufacturing precision
If the optical passing distance of transmissive light is made identical to reflective light, then transmittance characteristic is enhanced, but control of cell gap becomes difficult and yield reduces
Solution Approach 1:
The patent segments the cell gap into two distinct regions: a first cell gap for the reflective region and a second cell gap for the transmissive region. This segmentation allows independent optimization of each region's optical path length, achieving equalized optical passing distances for both transmissive and reflective light paths while maintaining manufacturability through standardized single cell gap processes.
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 achieves low power consumption, eliminates the need for additional driver ICs, enhances yield by simplifying manufacturing with a single cell gap, and maintains an optimal aperture ratio by allowing TFTs to be turned ON/OFF with a single gate line, thereby improving charge margin and optical performance.
Implementation Method 1
transreflective LCD apparatus with a single cell gap, wherein low power consumption can be achieved by equalizing electro-optical characteristics in a transmissive region and a reflective region
Implementation Method 2
first and second storage capacitors connected respectively to the first and second liquid crystal cells
Data Source
AI summary
A transreflective liquid crystal display (LCD) apparatus with a single cell gap is presented, along with a method of driving the apparatus. The apparatus operates with low power consumption because its electro-optical characteristics in a transmissive region and a reflective region are equalized. The transreflective LCD apparatus includes first and second liquid crystal cells formed respectively in transmissive and reflective regions of a first subpixel, first and second thin film transistors connected respectively to the first and second liquid crystal cells, and first and second storage capacitors connected respectively to the first and second liquid crystal cells.