OLED Input Sensor Diffraction Patterns for Wider Viewing Angles
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience a reduction in lateral viewing angle compared to front viewing angle 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 display devices to diffract light, thereby improving the lateral viewing angle and color-difference issues that arise with increased viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light is emitted in the lateral direction to improve viewing angle, then viewing angle coverage is improved, but color difference increases and brightness ratio deteriorates
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 viewing angle coverage while maintaining color accuracy by controlling the diffraction of different wavelengths of light
Solution Approach 2:
The refractive index of the diffraction pattern layer is specifically optimized (e.g., between 1.30-1.70) to control light diffraction characteristics. By changing the refractive index parameter, the system achieves improved lateral viewing angle while maintaining acceptable color difference levels
2Adaptability or versatility
If diffraction patterns are added to improve lateral viewing angle, then viewing angle characteristics are improved, but device complexity increases
Solution Approach 1:
The diffraction pattern layer serves multiple functions simultaneously: it acts as an optical element for light diffraction, a protective layer for the OLED, and a structural component of the display assembly. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The diffraction pattern layer is integrated with existing display structure layers, combining the optical diffraction function with the protective and structural functions already present in the display assembly, thereby minimizing additional complexity
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 overall viewing angle characteristics of OLED display devices by maintaining brightness and color consistency across different viewing angles, improving the display's performance and user experience.
Implementation Method 1
light emitted from an organic light emitting diode may be diffracted by diffraction patterns to improve a color-difference issue that may occur when a viewing angle is increased
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.