Overlapping Color Filters Preventing OLED Dead Pixels
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Solution Overview
Problem
In OLED display devices, the difference in thermal expansion of red, green, and blue color filters leads to a broken connection electrode, causing dark spots or dead pixels due to repeated contraction and expansion during thermal processes.
Innovation Solution
The OLED display device incorporates a configuration where the blue or green color filter extends to overlap the red color filter between the white OLED and the driving circuit unit, preventing the connection electrode from breaking by absorbing the thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple color filters (red, green, blue) are disposed separately on the substrate, then each color filter can be manufactured independently with appropriate pigments, but the difference in thermal expansion among the color filters causes the connection electrode to break during thermal processes
Solution Approach 1:
The patent merges the red, green, and blue color filters into a single integrated color filter layer instead of disposing them as separate layers. This integration ensures that all color filters experience uniform thermal expansion, preventing the connection electrode from breaking while maintaining the ability to manufacture different color regions with appropriate pigments.
2Manufacturing precision
If color filters are disposed in separate areas with different pigments, then color accuracy can be optimized for each pixel type, but repeated thermal contraction and expansion causes connection electrode failure leading to dark spots
Solution Approach 1:
The patent combines multiple color filters into one integrated structure where red, green, and blue color regions are formed within the same color filter layer. This merging eliminates differential thermal expansion between separate color filter layers, preventing connection electrode failure and dark spot formation while preserving precise pigment placement for color accuracy.
3Ease of operation
If the connection electrode spans across multiple color filter areas, then electrical connection can be established, but thermal expansion differences cause the electrode to break during manufacturing processes
Solution Approach 1:
The patent integrates the connection electrode within a single unified color filter layer rather than having it span across multiple separate color filter layers. This integration ensures the electrode experiences uniform thermal expansion, maintaining its structural strength and preventing breaks during manufacturing processes while preserving electrical connection functionality.
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 effectively prevents the connection electrode from breaking, thereby eliminating dark spots and ensuring stable pixel performance by aligning the thermal expansion of color filters.
Implementation Method 1
a white OLED WOLED and a plurality of color filters for realizing red (R), green (G), and blue (B)
Implementation Method 2
the difference in thermal expansion of red, green, and blue color filters leads to a broken connection electrode
Data Source
AI summary
Disclosed is an organic light emitting diode (OLED) display device for preventing a dark spot (dead pixel). The OLED display device includes a white OLED disposed in each of a plurality of pixels, a driving circuit unit disposed in each of the plurality of pixels, a first color filter disposed between the white OLED and the driving circuit unit, and a second color filter or a third color filter configured to overlap the first color filter between the white OLED and the driving circuit unit.