Anisotropic Absorption Layer for Display Devices
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Solution Overview
Problem
Existing OLED display technologies suffer from low transmittance of display lights and increased energy loss due to the use of circular polarizers to mitigate ambient light interference, which reduces the power-saving benefits of self-illumination.
Innovation Solution
An anisotropic absorption layer is integrated at the light-emitting side of the display panel, oriented at a predefined angle to maximize absorption of ambient lights while maintaining high transmittance of display lights, utilizing materials like black organic dye and liquid crystals or nano-tubes with aligned functional groups to control light absorption and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a liquid crystal display device is turned off, then power consumption is reduced, but the liquid crystal molecules remain in a tilted state causing residual images to persist
Solution Approach 1:
A common electrode is introduced as an intermediary component between the pixel electrode and the liquid crystal layer. By applying a common voltage to this intermediate electrode, the liquid crystal molecules can be returned to their initial state even when the display is turned off, preventing residual images without requiring continuous power to the pixel electrodes.
Solution Approach 2:
The electrode structure is segmented into pixel electrodes and a separate common electrode. This segmentation allows independent control of the common electrode to manage the overall liquid crystal orientation state, enabling residual image prevention through common voltage application while maintaining power savings when the display is off.
2Reliability
If a high voltage is applied to the pixel electrode to eliminate residual images, then residual image persistence is reduced, but the response time of the liquid crystal display increases
Solution Approach 1:
The common electrode serves as a mediator that distributes voltage uniformly across the liquid crystal layer. By applying a moderate common voltage rather than high pixel electrode voltage, the liquid crystal molecules are gently realigned to their initial state, preventing residual images while avoiding the response time delays caused by high-voltage pulses.
3Reliability
If the liquid crystal molecules are maintained in a vertical alignment state, then residual images are prevented, but the response time of the display increases
Solution Approach 1:
Instead of continuously maintaining vertical alignment, the common electrode applies periodic voltage pulses during specific timing intervals (such as during frame periods or at transition moments). This periodic action gradually returns liquid crystal molecules to their initial state without requiring continuous high voltage, thus preventing residual images while maintaining normal response times.
Solution Approach 2:
The common electrode applies voltage in advance during specific timing periods before residual images become problematic. By performing preliminary realignment of liquid crystal molecules during idle or transition periods, the system prevents residual image formation without interfering with the normal display response time when actual image content is being displayed.
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 configuration significantly reduces ambient light interference and enhances energy efficiency by allowing nearly 100% transmittance in the best view direction and reducing ambient light reflection, thereby improving display quality and power usage.
Implementation Method 1
a common electrode, configured to apply a common voltage to a liquid crystal layer, thereby controlling an overall orientation of the liquid crystal molecules in the display area
Implementation Method 2
a pixel electrode, configured to apply a pixel voltage to the liquid crystal layer, thereby controlling a local orientation of the liquid crystal molecules in a pixel of the display area
Data Source
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AI summary
A display apparatus comprising an anisotropic absorption layer and a display panel is disclosed. The anisotropic absorption layer is arranged at light-emitting side of the display panel. A predefined angle is formed between an absorption axis of the anisotropic absorption layer and a normal of the display panel. The anisotropic absorption layer is adapted to absorb ambient lights and transmit display lights from the display panel. The anisotropic absorption layer has a high absorptance to the ambient lights and a high transmittance to the display lights, such that the display apparatus can reduce influence of the ambient lights and improve energy usage.