Scattering Layer for HMD Display Lattice Pattern
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Solution Overview
Problem
In head-mounted displays using organic light emitting display devices, non-emissive areas are visible in a lattice pattern due to the design of the anode electrodes and bank structures, which affects the user's viewing experience.
Innovation Solution
Incorporating a scattering layer with a width wider than the bank, the scattering layer partially overlaps the emissive areas, scattering light and making the non-emissive areas less visible by distributing the light in the borders of the emissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bank structure is used to divide anode electrodes, then color mixing is prevented, but non-emissive areas become visible in a lattice pattern
Solution Approach 1:
A scattering layer is introduced as an intermediary component between the bank structure and the emissive area. This scattering layer has a width greater than the bank width and is positioned to partially overlap the emissive area, scattering light to fill in the non-emissive regions and eliminate the lattice pattern while preserving the bank's color separation function
Solution Approach 2:
The scattering layer is strategically positioned with selective overlap - it partially overlaps the emissive area while maintaining the bank structure's integrity. This localized application of scattering function allows the non-emissive areas to be filled optically without compromising the structural division and color mixing prevention provided by the banks
2Object-affected harmful factors
If the scattering layer width is increased to cover non-emissive areas, then lattice pattern visibility is reduced, but emissive area light output is affected
Solution Approach 1:
The scattering layer is designed with a width that exceeds the bank width, creating a partial overlap with the emissive area. This partial overlap is sufficient to scatter light into the non-emissive regions and eliminate the lattice pattern, while the scattering layer's optical properties ensure that the direct light output from the emissive areas remains sufficiently strong for normal display operation
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 scattering layer effectively reduces the visibility of non-emissive areas in a lattice form, enhancing the display's appearance and user experience by scattering light in the borders of the emissive areas, thus preventing the lattice pattern from being seen.
Implementation Method 1
a scattering layer overlapping the bank, a width of the scattering layer is wider than a width of the bank such that the scattering layer only partially overlaps the emitting area
Data Source
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AI summary
Disclosed is an organic light emitting display device and a head-mounted display including the same, which prevent non-emissive areas from being seen in a lattice form. The organic light emitting display device includes a plurality of anode electrodes (251) on a lower substrate (111), a bank (255) dividing the plurality of anode electrodes and covering an edge of each of the plurality of anode electrodes, an organic light emitting layer (253) on the plurality of anode electrodes, a second electrode (254) on the organic light emitting layer, and a scattering layer (SCL) overlapping the bank (255).