OLED Pixel Layout With Alternating Color Columns for Higher Brightness
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Solution Overview
Problem
OLED display devices face issues with low luminous brightness and high power consumption due to low transmittance of color filters and the cross color problem at large viewing angles, which reduces aperture ratio and worsens brightness.
Innovation Solution
A pixel structure with alternating first and second pixel columns, where the first columns have three colors and the second columns have a fourth color, improving color mixing and separating colors to prevent cross color issues, and a sub-pixel arrangement of 1:1:1:3 ratio to enhance brightness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used in OLED display devices, then color display is achieved, but transmittance decreases and luminous brightness is reduced
Solution Approach 1:
The pixel structure is segmented into multiple sub-pixels of different colors (RGBW or RGBE arrangement) instead of using a single color filter per pixel. This segmentation allows each sub-pixel to emit its own color directly, eliminating the need for color filters and improving light transmittance and luminous brightness.
Solution Approach 2:
The color filter layer is extracted or removed from the display structure. Instead of using color filters to create colors, the invention uses direct emission from organic light-emitting material layers of different colors, thereby eliminating the transmittance loss caused by color filters.
2Reliability
If color filters are used to achieve color display, then color purity is improved, but aperture ratio decreases and luminous efficiency is reduced
Solution Approach 1:
The color filter is extracted from the system. Color is achieved directly through the emission characteristics of organic light-emitting material layers with different color emissions (red, green, blue, and white or enhanced colors), eliminating the need for color filters and improving aperture ratio and luminous efficiency while maintaining color purity.
Solution Approach 2:
The mechanical/optical color filtering system is replaced with an electrical/optical emission system. Instead of using physical color filters to select wavelengths, the invention uses electrically controlled organic light-emitting layers that directly emit specific colors, improving overall system efficiency.
3Ease of manufacture
If conventional pixel arrangements are used, then manufacturing is simple, but cross color problems occur at large viewing angles
Solution Approach 1:
Different regions of the pixel structure are assigned different color-emitting properties. The pixel is divided into multiple sub-pixels with specific color emissions arranged in particular patterns (such as RGBW or RGBE arrangements), where each sub-pixel has optimized local color characteristics to prevent cross-color interference at large viewing angles while maintaining manufacturing simplicity.
4Stability of the object's composition
If sub-pixel quantity is increased to improve color mixing, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The pixel structure uses asymmetric sub-pixel arrangements such as RGBW (3 sub-pixels) or RGBE (4 sub-pixels) instead of symmetric arrangements. This asymmetric design optimizes color mixing and uniformity while controlling device complexity through standardized repeating unit structures that simplify manufacturing.
Data Source
AI summary
A pixel structure, a driving method thereof, a display panel, and a display apparatus are provided. The pixel structure includes: a plurality of pixel rows and a plurality of pixel columns. Each pixel row includes: sub-pixels of four different colors. The plurality of pixel columns include: a plurality of first pixel columns and a plurality of second pixel columns arranged alternately. Each of the first pixel columns includes: sub-pixels of three of the four different colors. Each of the second pixel columns includes: sub-pixels of another color other than the three of the four different colors.