Stacked Reflective and Emissive Display Assembly for Portable Objects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices for portable objects, such as wristwatches, face challenges in maintaining readability across varying ambient light conditions, with reflective LCDs being inefficient in low light and emissive OLEDs consuming excessive energy, making them unsuitable for continuous use.
Innovation Solution
A display assembly combining a reflective liquid crystal display device that switches between transparent and reflective modes with an emissive OLED or backlight-enabled transmissive LCD, allowing optimal operation in both bright and dark environments by leveraging sunlight for energy efficiency and providing excellent readability independent of viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective LCD is used to ensure good readability in bright conditions, then readability in sunlight is improved, but energy efficiency deteriorates due to significant light absorption by the backlight
Solution Approach 1:
The liquid crystal layer dynamically switches between reflective and transmissive modes based on ambient light conditions. In bright conditions, it operates in reflective mode to display information using reflected sunlight. In dark conditions, it switches to transmissive mode to allow backlight illumination, thereby adapting its optical properties to optimize both readability and energy efficiency across different environments.
Solution Approach 2:
The display device changes its optical parameters by switching the liquid crystal layer between different states. The liquid crystal layer modifies its optical properties (reflective vs. transmissive) based on ambient light levels, allowing the display to optimize between reflected light utilization and backlight transmission to improve overall energy efficiency while maintaining readability.
2Illumination intensity
If a transflective LCD is optimized to reflect sunlight effectively, then readability in bright conditions is improved, but transmission efficiency deteriorates causing significant light loss
Solution Approach 1:
The liquid crystal layer dynamically adjusts its optical state based on ambient light conditions. In bright conditions, it configures for reflective mode to maximize sunlight reflection. In dark conditions, it switches to transmissive mode to maximize backlight transmission, thereby dynamically optimizing both readability and light transmission efficiency without permanent compromise.
Solution Approach 2:
The display system changes its optical parameters by switching between reflective and transmissive modes. The liquid crystal layer modifies its optical properties to either reflect ambient light or transmit backlight, allowing the system to optimize light transmission efficiency in each operating condition rather than being constrained by a fixed optimized state.
3Illumination intensity
If an emissive OLED display is used to provide good display quality in darkness, then readability in dark environments is improved, but power consumption increases making continuous operation impossible
Solution Approach 1:
The liquid crystal layer dynamically switches between reflective and transmissive modes based on ambient light detection. In dark conditions, it operates in transmissive mode to allow the OLED backlight to illuminate the display. In bright conditions, it switches to reflective mode to utilize ambient light, thereby dynamically reducing power consumption when high illumination is not needed while maintaining readability in darkness when required.
Solution Approach 2:
The display system changes its optical parameters by switching the liquid crystal layer between reflective and transmissive states. This allows the OLED to operate at lower power levels in reflective mode during daytime while maintaining the capability to switch to transmissive mode for high-visibility operation in dark environments, optimizing the balance between power consumption and readability.
4Use of energy by moving object
If a reflective LCD is used to ensure energy efficiency in bright conditions, then energy consumption is reduced, but readability in dark environments deteriorates
Solution Approach 1:
The liquid crystal layer dynamically switches between reflective and transmissive modes based on ambient light conditions. In bright conditions, it operates in reflective mode to minimize energy consumption by utilizing reflected sunlight. In dark conditions, it switches to transmissive mode to allow backlight illumination, thereby dynamically adapting to maintain readability across different lighting environments while optimizing energy consumption in each condition.
Solution Approach 2:
The display system changes its optical parameters by switching between reflective and transmissive modes. The liquid crystal layer modifies its optical properties to either reflect ambient light for energy-efficient operation or transmit backlight for improved readability in dark environments, allowing the system to optimize both energy consumption and readability based on ambient 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 enables continuous, energy-efficient display of information in bright conditions and high readability in low light or darkness, reducing power consumption while maintaining legibility, thus addressing the limitations of existing technologies.
Implementation Method 1
a first reflective display device located on the observer's side, this first display device being capable of switching between a transparent state when at rest and a reflective state when activated
Implementation Method 2
the second display device comprises an emissive organic light-emitting diode display cell
Implementation Method 3
emissive organic light-emitting diode (OLED) display cell
Implementation Method 4
a reflective liquid crystal display cell
Data Source
Figure 1~2D
Figure 3~4D
Figure 5
AI summary
Display assembly for a portable object, this display assembly (1; 100; 200) comprising a first reflective display device (2; 102; 202) located on the side of an observer (4), a second emissive display device (6; 104; 204) being disposed under the first reflective display device (2; 102; 202).