PDLC Display Device Sub-Frame Voltage Control
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Solution Overview
Problem
Current display devices using polymer dispersed liquid crystal (PDLC) struggle to efficiently switch between transparent and scattering states, affecting image visibility and background recognition, especially in multicolor displays.
Innovation Solution
A display device configuration with a liquid crystal layer sandwiched between substrates, utilizing a reverse mode PDLC and a timing controller to apply specific voltages for each pixel, allowing for precise control of scattering and transparency states, enabling clear image display and background visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a liquid crystal display panel using polymer dispersed liquid crystal is used to switch between diffused and transparent states, then image display capability is improved, but switching efficiency and control precision are insufficient
Solution Approach 1:
The display panel is divided into multiple sub-frame periods within one frame period, with each sub-frame period displaying a specific color (R, G, B). This segmentation allows independent control of each color channel, improving switching efficiency and enabling precise multicolor display by selectively activating liquid crystal regions for each color component.
Solution Approach 2:
The display operation uses periodic sub-frame periods to sequentially display different colors (R, G, B) within one frame period. This periodic action enables multicolor display through time-division multiplexing, where each color is displayed in its designated sub-frame period, improving overall switching efficiency and color control precision.
2Ease of operation
If the liquid crystal display panel switches to transparent state for background visibility, then background recognition is improved, but image visibility and color accuracy deteriorate
Solution Approach 1:
Different regions of the display panel can be in different states (transparent or diffused) simultaneously. The timing controller applies voltages selectively to specific pixel regions, allowing local transparency for background recognition while maintaining image display capability in other regions, thus resolving the contradiction between background visibility and image quality.
Solution Approach 2:
The display panel dynamically switches between transparent and diffused states on demand, with the ability to maintain either state independently in different time periods or regions. This dynamic control allows the system to adapt to different usage scenarios, providing background recognition when needed while preserving image visibility at other times.
3Adaptability or versatility
If multicolor display is achieved by selecting display color for each sub-frame period, then color variety is improved, but switching precision and timing control worsen
Solution Approach 1:
The timing controller implements precise voltage control for each sub-frame period based on feedback from the liquid crystal response characteristics. By monitoring and adjusting voltages applied to pixel electrodes during each color sub-frame period, the system achieves accurate color rendering and timing control, resolving the contradiction between color variety and switching precision.
Solution Approach 2:
The system changes voltage parameters and timing parameters for each sub-frame period to optimize color display. By adjusting voltage magnitude and duration specific to each color (R, G, B) sub-frame, the system achieves precise control over liquid crystal switching, enabling accurate multicolor display while maintaining high switching precision.
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 solution allows for effective switching between transparent and scattering states, enhancing image visibility and background recognition, particularly in multicolor displays, by optimizing the liquid crystal layer's voltage control and substrate configuration.
Implementation Method 1
a liquid crystal layer which is partly switched between a transparent state in which incident light is transmitted and a scattering state in which incident light is scattered by applying a voltage between the pixel electrodes and the common electrode
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate including a common electrode, and a display function layer which is partly switched between a transparent state and a scattering state. The first substrate includes a first scanning line, a first signal line, an insulating layer, a first switching element, and a first pixel electrode. The first signal line includes a first coupling portion and a first line portion. The first scanning line intersects the first coupling portion and is provided in a same layer as the first line portion. The insulating layer is interposed between the first coupling portion and the first scanning line.