Reflective Electrode Segmentation for Brighter LCD Reflection Mode
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Solution Overview
Problem
Reflective and transflective liquid crystal display devices face limitations in achieving brighter displays in reflection mode due to inefficient light usage.
Innovation Solution
The design includes a liquid crystal display device with a reflective electrode having a concave-convex surface structure, a transparent insulating layer, and a pixel electrode formed from transparent conductive material, where the reflective electrode is provided with the same potential as the pixel electrode during maximum gray scale display, and different potentials are applied to the counter and reflective electrodes to enhance reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reflective region is added to each pixel for reflection mode display, then the display can be used in reflection mode, but the light usage efficiency (reflectance) is insufficient and the display is not bright enough
Solution Approach 1:
The reflective electrode is divided into a first region within each pixel and a second region located between adjacent pixels. This segmentation allows the region between pixels to contribute to reflection mode display, effectively utilizing previously wasted light and improving overall reflectance without affecting the adaptability of display modes.
2Use of energy by moving object
If the reflective electrode region between pixels is utilized for reflection display, then light usage efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The reflective electrode is designed to serve multiple functions: the first region within each pixel serves as the pixel electrode for both reflection and transmission modes, while the second region between pixels serves as an additional reflective area. This multi-functionality improves light usage efficiency without requiring separate structures for different display modes.
3Stability of the object's composition
If voltage of the same polarity is applied to adjacent pixels, then liquid crystal alignment is improved, but the potential difference between counter electrode and reflective electrode is reduced
Solution Approach 1:
Different voltage conditions are applied to different regions: pixels receive voltage of the same polarity for stable liquid crystal alignment, while the reflective electrode and counter electrode maintain a potential difference to maximize reflectance in the region between pixels. This local differentiation of electrical conditions optimizes both alignment stability and light reflection efficiency.
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 configuration improves reflectance and achieves a brighter display in the reflection mode by effectively utilizing the reflective region between pixels, resulting in a more efficient light usage and improved reflectance compared to conventional devices.
Implementation Method 1
a reflective electrode including a first region located within each of the plurality of pixels and a second region located between any two pixels, of the plurality of pixels, adjacent to each other
Implementation Method 2
a vertical alignment liquid crystal layer provided between the first substrate and the second substrate
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate, a vertical alignment liquid crystal layer, and a plurality of pixels. Each of the pixels includes a reflective region for performing display in a reflection mode. The first substrate includes a reflective electrode including a first region located within each of the plurality of pixels and a second region located between any two pixels, of the plurality of pixels, adjacent to each other, a transparent insulating layer provided to cover the reflective electrode, and a pixel electrode formed from a transparent conductive material and provided on the transparent insulating layer in each of the plurality of pixels. The second substrate includes a counter electrode provided to be opposite to the pixel electrode and the reflective electrode. Voltage of the same polarity is applied to the liquid crystal layer of any two pixels, of the plurality of pixels, adjacent to each other along a row direction, any two pixels, of the plurality of pixels, adjacent to each other along a column direction, or all of the plurality of pixels. The counter electrode and the reflective electrode are provided with potentials different from each other.