Transflective LCD Viewing Angle Optimization
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Solution Overview
Problem
Transflective liquid crystal display devices suffer from narrow viewing angles due to birefringence characteristics and require additional compensation films to improve light transmittance, increasing manufacturing costs.
Innovation Solution
A liquid crystal display device design with a first and second substrate, including a transmission part and reflection part, respectively, featuring common and pixel electrodes with specific orientations and alignment layers to enhance viewing angles and optical efficiency without additional compensation films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ECB mode liquid crystal is used in transflective display device, then light transmittance is improved, but manufacturing cost increases due to additional compensation films
Solution Approach 1:
The patent extracts and eliminates the need for additional compensation films by using a different liquid crystal mode (VA mode) that inherently provides wide viewing angle characteristics without requiring the ECB mode's compensation films, thus reducing manufacturing cost while maintaining light transmittance
Solution Approach 2:
The patent changes the liquid crystal operating mode from ECB to VA mode, which fundamentally alters the birefringence characteristics and eliminates the need for compensation films, achieving both wide viewing angle and reduced manufacturing complexity
2Adaptability or versatility
If dual cell gap structure is used in transflective display device, then viewing angle is improved, but light transmittance deteriorates due to polarization state variation
Solution Approach 1:
The patent changes the liquid crystal mode from ECB to VA mode, which fundamentally alters how the liquid crystal handles polarization states. The VA mode's vertical alignment structure maintains consistent optical properties across different viewing angles, eliminating the light transmittance deterioration problem associated with dual cell gap ECB mode structures
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
The design improves viewing angles and optical efficiency by matching the driving characteristics of the transmission and reflection parts, reducing the need for additional compensation films and lowering manufacturing costs.
Implementation Method 1
Liquid crystal provided in the transflective liquid crystal display device according to the prior art has a narrow viewing angle due to birefringence characteristics thereof. The liquid crystal adopts an ECB (electrically controlled birefringence) mode using interference between ordinary ray and extraordinary ray of incident light.
Implementation Method 2
Liquid crystal provided in the transflective liquid crystal display device according to the prior art has a narrow viewing angle due to birefringence characteristics thereof. The liquid crystal adopts an ECB (electrically controlled birefringence) mode using interference between ordinary ray and extraordinary ray of incident light.
Data Source
AI summary
A liquid crystal display device includes: a first substrate including a transmission part and a reflection part; a common electrode disposed on the transmission part and the reflection part; a plurality of first pixel electrodes disposed on the transmission part and having a first electrode direction; a plurality of second pixel electrodes disposed on the reflection part and having a second electrode direction, the first electrode direction and the second electrode direction creating an acute angle; a second substrate facing the first substrate; and a liquid crystal layer interposed between the first and second substrates.