Dual-Emitter Display Light Control for Privacy Viewing Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices struggle to balance display quality with the need for controlling light exit angles to enhance security and reduce reflection, particularly in diverse applications such as smartphones and car dashboards.
Innovation Solution
A display device design featuring a light control layer with a transmission part and light blocking part, where the first light-emitting element is co-planar with the circuit layer and the second light-emitting element is positioned above an organic layer, allowing for selective control of light exit angles through a light control layer that blocks light from one element but not the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking part is added to control light exit angles for security and reduce reflection, then security and anti-reflection performance are improved, but display quality and luminance uniformity deteriorate due to light blocking
Solution Approach 1:
The light blocking part is segmented into multiple regions: a first light blocking part that blocks light from the first light emitting element, and a second light blocking part that blocks light from the second light emitting element. This segmentation allows selective light control for different functional modes while maintaining display quality in each mode.
Solution Approach 2:
Different regions of the light blocking part have different light blocking characteristics tailored to their specific functions. The first light blocking part is positioned and sized to control light from the first light emitting element for privacy mode, while the second light blocking part controls light from the second light emitting element for general mode, achieving local optimization of light control.
2Ease of operation
If a light control layer is added to limit exit angles for privacy mode, then viewing angle control is improved, but light transmission and overall display brightness worsen
Solution Approach 1:
The display device dynamically switches between different light emitting elements based on the desired operating mode. The first light emitting element is used for privacy mode with the first light blocking part, and the second light emitting element is used for general mode with the second light blocking part, allowing the system to adapt its light control characteristics dynamically.
Solution Approach 2:
The light blocking part acts as an intermediary element that selectively controls light from different light emitting elements. By positioning the light blocking part between the light emitting elements and the viewer, it enables viewing angle control without requiring the light emitting elements themselves to be modified.
3Adaptability or versatility
If the first light emitting element is placed co-planar with the circuit layer and the second light emitting element is positioned above the organic layer, then light control flexibility is improved, but structural complexity increases
Solution Approach 1:
The second light emitting element is positioned in a different vertical dimension (above the organic layer) compared to the first light emitting element (co-planar with the circuit layer). This dimensional separation enables independent optical control of each element through the corresponding light blocking parts, achieving flexible light control without requiring complex lateral arrangements.
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 design enables enhanced display quality by allowing for privacy modes with limited viewing angles and general modes with unrestricted viewing, while preventing luminance degradation due to light blocking, applicable in various electronic devices.
Implementation Method 1
a light blocking part disposed to fill the opening and blocking light emitted by the display element layer
Data Source
AI summary
A display device includes a circuit layer, a display element layer disposed on the circuit layer, and a light control layer disposed on the display element layer. The display element layer may include a first light-emitting element, a second light-emitting element spaced apart from the first light-emitting element in a first direction perpendicular to a thickness direction, a pixel-defining film having first and second pixel openings defined therein, and an organic layer disposed between the circuit layer and the pixel-defining film. The light control layer may include a transmission part having an opening defined therein, and a light blocking part disposed to fill the opening. The first light-emitting element may be disposed on a same layer as the organic layer, and the second light-emitting element may be disposed above the organic layer.