Reflective Display Device with Dynamic Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reflective display devices struggle to enhance contrast and visibility, especially in dark environments, as they rely on external light and lack effective mechanisms to improve luminance and color representation.
Innovation Solution
A display device incorporating a light modulation layer with refractive index anisotropy, a polarization layer, a reflection layer, and a phase retardation layer, which controls light scattering and polarization to achieve high luminance and visibility, along with a side light source that adjusts based on ambient illumination to optimize display mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective display devices use external light for display, then the device structure is simple and power consumption is low, but visibility and contrast are poor in dark environments
Solution Approach 1:
The patent combines reflective and transmissive display modes into a single device structure. The display panel includes both a reflection layer for external light and a backlight unit for self-generated light, allowing the device to function in both reflective and transmissive modes depending on ambient lighting conditions.
Solution Approach 2:
The patent implements dynamic switching between reflective and transmissive modes based on ambient light conditions. The control unit detects ambient illumination and automatically adjusts the display mode, transitioning from reflective mode in bright environments to transmissive mode in dark environments to maintain optimal visibility.
2Illumination intensity
If transmissive display devices use a backlight, then visibility in dark places is improved, but power consumption increases and the device loses reflective display capability
Solution Approach 1:
The patent implements dynamic switching between reflective and transmissive modes based on ambient light conditions. The control unit detects ambient illumination and automatically adjusts the display mode, transitioning from reflective mode in bright environments to transmissive mode in dark environments to maintain optimal visibility.
Solution Approach 2:
The patent changes the operational parameters of the display panel based on ambient light conditions. By adjusting the backlight intensity and switching between display modes, the system optimizes power consumption while maintaining visibility across different lighting environments.
3Illumination intensity
If semi-transmissive display devices place transmission windows in reflective display devices, then visibility is improved, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent combines reflective and transmissive display modes into a single device structure. The display panel includes both a reflection layer for external light and a backlight unit for self-generated light, allowing the device to function in both reflective and transmissive modes depending on ambient lighting conditions.
4Use of energy by moving object
If reflective display devices rely on external light, then power consumption is low, but contrast and color representation are insufficient
Solution Approach 1:
The patent implements dynamic switching between reflective and transmissive modes based on ambient light conditions. The control unit detects ambient illumination and automatically adjusts the display mode, transitioning from reflective mode in bright environments to transmissive mode in dark environments to maintain optimal visibility.
Solution Approach 2:
The patent changes the operational parameters of the display panel based on ambient light conditions. By adjusting the backlight intensity and switching between display modes, the system optimizes power consumption while maintaining visibility across different lighting environments.
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 enables high luminance and improved visibility in both reflective and transmissive modes, enhancing contrast and color representation without the need for additional scattering layers, thus improving display performance in various lighting conditions.
Implementation Method 1
a polarization layer which is disposed on a front side of the light modulation layer, on which side external light enters, and which shuts out light other than light whose polarization direction is a predetermined polarization direction
Implementation Method 2
a phase retardation layer which is disposed between the polarization layer and the light modulation layer, which creates a predetermined phase difference between incident light and reflected light, and which polarizes the reflected light in a direction different from the predetermined polarization direction
Implementation Method 3
a light modulation layer having predetermined refractive index anisotropy and including plural light modulation areas which differ in responsiveness to an electric field generated by electrodes
Implementation Method 4
the light modulation layer transmitting the reflected light at the time of the electric field not being generated, the light modulation layer scattering the reflected light at the time of the electric field being generated
Implementation Method 5
a reflection layer disposed on a back side of the light modulation layer, the external light passing through the polarization layer and becoming the incident light, the incident light being reflected from the reflection layer and becoming the reflected light
Data Source
AI summary
A display device including a first substrate including a plurality of reflection electrodes on a front side of the first substrate, the plurality of reflection electrodes including a first reflection electrode and a second reflection electrode which is farther away from a light source than the first reflection electrode; a second substrate including a transparent electrode on a back side of the second substrate; a light modulation layer which includes a polymer dispersed liquid crystal layer containing a liquid crystalline monomer and liquid crystal molecules dispersed in the liquid crystalline monomer, the light modulation layer being disposed between the plurality of reflection electrodes and the transparent electrode; a drive section driving the plurality of reflection electrodes and the transparent electrode, wherein an application time of a first drive voltage applied between the transparent electrode and the first reflection electrode is shorter than an application time of a second drive voltage applied between the transparent electrode and the second reflection electrode.