Polymer Dispersed Liquid Crystal Display Voltage Control
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Solution Overview
Problem
Existing display apparatuses face challenges in reducing power consumption and maintaining image recognizability when external light is incident, as they often require increasing backlight output, leading to luminance unevenness and decreased recognizability of backgrounds and images with small luminance differences.
Innovation Solution
A display apparatus comprising a first and second light-transmissive substrate with a liquid crystal layer containing polymer dispersed liquid crystal, and a display controller that adjusts the voltage applied to pixel electrodes based on external light intensity information to control light emission from light-emitting devices, thereby reducing power consumption and enhancing image recognizability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight output is increased to maintain image visibility in external light conditions, then image recognizability is improved, but power consumption increases and luminance unevenness occurs
Solution Approach 1:
The display controller dynamically adjusts the voltage applied to pixel electrodes based on real-time external light intensity detection. The system transitions from static backlight operation to dynamic voltage modulation, where the voltage is continuously adjusted according to ambient lighting conditions to maintain optimal image visibility while minimizing power consumption.
Solution Approach 2:
The invention changes the electrical parameter (voltage) applied to pixel electrodes in response to external light intensity. By modifying the voltage parameter based on detected light conditions, the system achieves adaptive control that balances image recognizability with power consumption, avoiding fixed high backlight output.
2Illumination intensity
If the backlight output is increased to compensate for external light, then image visibility is improved, but luminance unevenness increases and background recognizability decreases
Solution Approach 1:
The invention applies different voltage levels to different pixel electrodes based on their specific light reception characteristics. Each pixel region receives customized voltage control according to its local external light exposure, creating non-uniform voltage distribution that compensates for varying light conditions across the display surface and maintains overall luminance uniformity.
Solution Approach 2:
The display controller uses feedback from external light intensity detection to continuously adjust the voltage applied to pixel electrodes. This closed-loop control system monitors ambient light conditions and adapts the electrical parameters in real-time, preventing luminance unevenness by compensating for external light variations.
3Use of energy by moving object
If the voltage to pixel electrodes is reduced to save power, then power consumption is improved, but image visibility decreases in external light conditions
Solution Approach 1:
The system dynamically adjusts voltage levels based on detected external light intensity. In bright external light conditions, the controller reduces voltage to pixel electrodes to minimize power consumption. In darker conditions, the voltage is increased to maintain image visibility, creating a dynamic adaptation that balances power savings with display performance.
Solution Approach 2:
The invention changes the voltage parameter adaptively based on environmental conditions. By detecting external light intensity and modifying the electrical parameter accordingly, the system achieves optimal power consumption while maintaining sufficient image visibility across varying lighting conditions.
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 effectively reduces power consumption and improves image recognizability by adjusting light emission in response to external light conditions, preventing luminance unevenness and ensuring clear visualization of both images and backgrounds.
Implementation Method 1
a liquid crystal layer sealed between the first light-transmissive substrate and the second light-transmissive substrate, and including polymer dispersed liquid crystal
Data Source
AI summary
According to an aspect, a display apparatus includes: a first light-transmissive substrate; a second light-transmissive substrate facing the first light-transmissive substrate; a liquid crystal layer sealed between the first light-transmissive substrate and the second light-transmissive substrate, and including polymer dispersed liquid crystal; at least one light-emitting device facing at least one of a side surface of the first light-transmissive substrate or a side surface of the second light-transmissive substrate; and a display controller configured to perform control so as to reduce power consumption based on a signal, the signal being in accordance with a signal of external light intensity information supplied from an external light setting device.