OLED Input Sensor Diffraction Patterns for Lateral Color Uniformity
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Solution Overview
Problem
Organic light emitting diode (OLED) devices suffer from reduced lateral viewing angles compared to front viewing angles due to poor light-emitting characteristics in the lateral direction, leading to suboptimal display performance.
Innovation Solution
Incorporating diffraction patterns in the input sensor of OLED devices, specifically in the insulating layers, to diffract light and improve color difference and overall viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light is emitted from organic light emitting diode in lateral direction, then display coverage is increased, but color difference increases and viewing angle characteristics deteriorate
Solution Approach 1:
A diffraction pattern layer is introduced as an intermediary component between the OLED and the viewer. This layer diffracts light in the lateral direction, enabling wider display coverage while maintaining color accuracy by controlling the angular distribution of emitted light.
Solution Approach 2:
The patent modifies the optical parameters of light emission by using diffraction patterns with specific pitch and geometry. By changing the spatial frequency and orientation of the diffraction patterns, the light distribution characteristics are altered to achieve both wide viewing angle and color accuracy.
2Adaptability or versatility
If viewing angle is increased for lateral viewing, then display accessibility is improved, but color difference issue occurs
Solution Approach 1:
The diffraction pattern layer serves as an optical mediator that separates the function of wide-angle emission from color purity. It redirects light at various angles while preserving the spectral characteristics, thus achieving both wide viewing angle and color accuracy.
Solution Approach 2:
The viewing angle range is segmented into different diffraction orders, with each order directing light to specific angular ranges. This segmentation allows different portions of the viewing cone to maintain appropriate color characteristics while achieving overall wide viewing angle coverage.
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 implementation of diffraction patterns enhances the lateral viewing angle by distributing light more evenly, reducing color differences and improving the overall viewing experience.
Implementation Method 1
at least one of the first and second insulating layers includes a plurality of diffraction patterns arranged to diffract at least a portion of the light provided from the display panel
Data Source
AI summary
A display device includes a display panel including a light-emitting device to emit light; and an input sensor disposed on the display panel. The input sensor includes a first insulating layer disposed on the display panel; a first conductive layer disposed on the first insulating layer; a second insulating layer covering the first conductive layer; and a second conductive layer disposed on the second insulating layer. At least one of the first and second insulating layers includes a plurality of diffraction patterns arranged to diffract at least a portion of the light provided from the display panel.