Segmented Liquid Crystal Electrodes for Uniform Illumination Control
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Solution Overview
Problem
Existing display devices using polymer dispersion type liquid crystal panels face challenges in accurately controlling light quantity across sub illumination regions, leading to uneven illumination and potential sticking issues due to differences in voltage application times, especially when displaying dark images or during scan drives.
Innovation Solution
The display device incorporates a polymer dispersion type liquid crystal panel with sub illumination regions where first electrodes are divided into groups, allowing independent control of scattering and non-scattering states, enabling precise light quantity adjustment by varying the number and timing of divided sub illumination regions, thereby equalizing voltage application times across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the time for applying voltage to the liquid crystal layer is shortened in sub illumination regions close to the light source, then light quantity control is improved, but sticking unevenness occurs between sub illumination regions
Solution Approach 1:
The patent divides each sub illumination region into multiple divided sub illumination regions (first, second, third, etc.) along the light source side to display panel side direction. Each divided region can be independently controlled with different voltage application times, allowing precise control of light quantity while maintaining uniform voltage application timing across all regions to prevent sticking unevenness.
Solution Approach 2:
Different divided sub illumination regions within the same sub illumination region are assigned different light emission areas and voltage application times based on their position. Regions closer to the light source have smaller light emission areas and longer voltage application times, while regions farther away have larger areas and shorter times, creating local optimization that prevents both over-illumination and sticking issues.
2Illumination intensity
If the time for applying voltage is reduced to control light quantity in scan drive, then light quantity control is improved, but liquid crystal layer response becomes insufficient
Solution Approach 1:
By segmenting sub illumination regions into multiple divided regions, the patent enables selective activation of only the necessary number of divided regions based on required light quantity. This segmentation allows the liquid crystal layer to respond充分地 within the divided period since each activated region receives sufficient voltage application time, while inactive regions consume no response time.
Solution Approach 2:
The patent applies partial action by activating only the required number of divided sub illumination regions rather than all regions simultaneously. When dark images are displayed, fewer divided regions are activated with adequate voltage application time, ensuring sufficient liquid crystal response without wasting time on regions that don't need illumination.
3Stability of the object's composition
If all sub illumination regions are in scattering state during static drive, then uniform illumination is achieved, but light quantity control precision is reduced
Solution Approach 1:
The patent segments each sub illumination region into multiple divided sub illumination regions with independently controllable light emission. During static drive, different divided regions can be selectively activated or deactivated, enabling precise control of total light quantity while maintaining uniform illumination from activated regions. This segmentation transforms the binary on/off control into granular intensity control.
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 solution allows for accurate light quantity control and reduced sticking unevenness, ensuring sufficient light emission even during dark image display and improving response speed of the liquid crystal layer, thus enhancing overall display performance.
Implementation Method 1
switching between a scattering state where the illumination light is scattered and a non-scattering state where the illumination light is not scattered, are independently controlled by applying a voltage to a liquid crystal layer
Data Source
AI summary
A display device according to an aspect of the present invention includes a plurality of sub illumination regions in which switching between a scattering state and a non-scattering state are independently controlled by applying a voltage to a liquid crystal layer. In the sub illumination region, first electrodes for applying the voltage to the liquid crystal layer are aligned, The first electrodes is divided into a plurality of groups in which every or a plurality of first electrodes are electrically connected each other. The sub illumination region includes divided sub illumination regions, in which the switching between the scattering state and the non-scattering state are independently controlled, corresponding to the groups.