Display Apparatus Color Filter Layout to Reduce Diffraction
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Solution Overview
Problem
Display apparatuses suffer from visible diffraction patterns that degrade image quality, particularly due to the step differences between color filters and light blocking material layers.
Innovation Solution
The display apparatus incorporates a design where color filters of different wavelength bands are arranged on the same layer without overlapping, with a light blocking material layer having openings for each filter, and an overcoating layer to minimize step differences, ensuring a flat surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If color filters and light blocking material layers are arranged in separate layers with step differences, then the manufacturing process is simplified, but diffraction patterns are generated that degrade image quality
Solution Approach 1:
The color filter layer and light blocking material layer are merged into a single planar layer, eliminating step differences between layers. The color filters are positioned adjacent to light blocking regions in the same layer, combining both functions in one structure to prevent diffraction while maintaining manufacturing simplicity
Solution Approach 2:
The design transitions from a vertical stacking arrangement (separate layers with height differences) to a horizontal planar arrangement (same layer with adjacent regions). This dimensional change eliminates the step difference problem while maintaining the functional separation between color filters and light blocking material
2Use of energy by moving object
If color filters are arranged to overlap each other to improve light utilization, then luminance efficiency is improved, but diffraction patterns are intensified
Solution Approach 1:
The color filters are arranged in an asymmetric non-overlapping pattern where each filter is positioned adjacent to light blocking regions rather than overlapping with other filters. This asymmetric arrangement prevents the formation of regular diffraction patterns while still achieving effective light utilization through strategic positioning
3Object-affected harmful factors
If a flat surface structure is implemented to reduce diffraction, then image quality is improved, but manufacturing complexity increases
Solution Approach 1:
The single layer structure serves multiple functions simultaneously: it acts as both the color filter layer and the light blocking material layer, eliminates the need for separate layer formation processes, and provides a flat surface to prevent diffraction. This multi-functional design achieves image quality improvement without proportionally increasing manufacturing 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
This configuration significantly reduces diffraction patterns, enhancing image quality by minimizing light interference and improving visual clarity.
Implementation Method 1
the color filter layer includes a first color filter configured to transmit the light in the first wavelength band, a second color filter configured to transmit the light in the second wavelength band, and a third color filter configured to transmit the light in the third wavelength band
Implementation Method 2
a light blocking material layer disposed on the pixel defining layer
Data Source
AI summary
A display apparatus, in which diffraction patterns observed on a screen are prevented or minimized, includes a color filter layer disposed on a plurality of light-emitting elements including a first color filter configured to transmit light in a first wavelength band, a second color filter configured to transmit light in a second wavelength band, and a third color filter configured to transmit light in a third wavelength band, where, in a plan view, the first to third color filters each have an elliptical shape and do not overlap each other.