PDLC Display Panel Segmentation for Transparency and Visibility
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Solution Overview
Problem
Current display devices using polymer dispersed liquid crystal (PDLC) panels face challenges in achieving high transparency and visibility of backgrounds while displaying images, particularly when images overlap with the background, due to limitations in controlling the scattering and transparency states of the liquid crystal layer.
Innovation Solution
The display device employs a reverse-mode polymer dispersed liquid crystal layer with a control unit that sets different transparency states in various areas of the display panel, using a combination of gate and source line drivers to manage voltage frequencies and polarities, allowing for higher transparency in non-object areas and controlled scattering in object areas, enabling improved visibility of both images and backgrounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the liquid crystal layer is in a scattering state to display images, then image visibility is improved, but background transparency deteriorates
Solution Approach 1:
The display panel is divided into multiple regions (object area and non-object area) with different transparency states. The control unit selectively applies voltage to different regions, causing the liquid crystal layer to switch between scattering and transparent states in different areas simultaneously, thus resolving the contradiction between image visibility and background transparency
Solution Approach 2:
Different regions of the display panel are given different optical properties. The object area maintains scattering state for image display while the non-object area maintains transparent state for background visibility. This local differentiation allows both requirements to be satisfied simultaneously
2Object-affected harmful factors
If the liquid crystal layer is in a transparent state to see background, then background visibility is improved, but image display capability deteriorates
Solution Approach 1:
The display panel is segmented into object area and non-object area, with the control unit applying different voltage states to each region. The non-object area remains transparent for background visibility while the object area maintains scattering state for image display
Solution Approach 2:
Different regions have different optical states tailored to their specific functions. The non-object area is optimized for transparency to see background, while the object area is optimized for scattering to display images clearly
3Adaptability or versatility
If multicolor display is implemented by switching display color in sub-frame periods, then color display capability is improved, but frame rate deteriorates
Solution Approach 1:
The display device uses periodic sub-frame periods to switch between different colors. By dividing the frame period into multiple sub-frames, the system can display multiple colors while maintaining a higher effective frame rate through rapid sequential updates
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 enhances the visibility of images and backgrounds by optimizing the transparency and scattering states, allowing users to see images more clearly even when they overlap with the background, while also reducing the risk of color breakup and increasing the frame rate.
Implementation Method 1
a display device comprising a polymer dispersed liquid crystal (hereinafter referred to as PDLC) panel, which can switch between a diffusing state of diffusing incident light and a transmitting state of allowing incident light to pass through
Data Source
AI summary
According to one embodiment, a display device includes a display panel, a light source unit and a control unit. The control unit sets a display area to a second transparent state in which a degree of transparency is higher than a degree of transparency of a first transparent state in a reset period. The control unit displays an image in an object area, sets a non-object area to the first transparent state and holds a non-rewrite area in the second transparent state in a rewrite period. The gate driver drives second gate lines at a second drive frequency higher than a first drive frequency at which the gate driver drives first gate lines or selectively drives the first gate lines in the rewrite period.