OLED Pixel Layout With White Sub-Pixels for Color Shift Control
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels face issues with color shift and low brightness due to the strong light absorption by color film layers and the sensitivity of emission spectra to driving voltage, particularly at low grayscales where blue light emission is affected, leading to poor color performance.
Innovation Solution
A display panel design incorporating m color sub-pixels and k white sub-pixels, where the white sub-pixels adjust luminance to meet grayscale requirements, preventing color shift and enhancing brightness by compensating for luminance losses without altering the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color film layers are used to generate color light, then color display is achieved, but light absorption is strong leading to low brightness
Solution Approach 1:
The pixel is divided into multiple sub-pixels including color sub-pixels and white sub-pixels. Each sub-pixel independently emits light, allowing the white sub-pixels to compensate for the light absorbed by color film layers in color sub-pixels, thereby improving overall brightness without increasing energy loss.
2Measurement precision
If driving voltage is adjusted to control luminance, then grayscale control is achieved, but emission spectra are sensitive to voltage changes causing color shift
Solution Approach 1:
The pixel is segmented into color sub-pixels for accurate color emission and white sub-pixels for luminance adjustment. This allows independent control of color and brightness, enabling grayscale control through white sub-pixel activation rather than voltage adjustment, thus preventing color shift while maintaining color accuracy.
Solution Approach 2:
Instead of changing driving voltage to control luminance (which affects emission spectra), the patent changes the operational parameters by activating different combinations of white sub-pixels with unequal areas. This provides grayscale control through selective sub-pixel activation rather than voltage modulation, maintaining stable emission spectra and preventing color shift.
3Measurement precision
If white sub-pixels with equal areas are used, then manufacturing is simplified, but luminance adjustment precision is insufficient
Solution Approach 1:
White sub-pixels are designed with unequal areas to provide different luminance levels. This asymmetric design enables precise luminance adjustment by selectively activating combinations of white sub-pixels with different areas, achieving fine-grained brightness control while maintaining relatively simple manufacturing processes.
4Measurement precision
If multiple white sub-pixels with unequal areas are implemented, then luminance control precision is improved, but device complexity increases
Solution Approach 1:
The pixel is segmented into color sub-pixels and white sub-pixels with unequal areas. This segmentation allows the white sub-pixels to function as a luminance control module independent of the color sub-pixels, achieving precise luminance control through selective activation without significantly complicating the overall pixel structure.
Solution Approach 2:
The white sub-pixels with unequal areas serve multiple functions: they provide luminance compensation for the color sub-pixels, enable precise grayscale control, and maintain color accuracy. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving precise luminance control.
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 solution effectively prevents color shift and improves brightness by allowing the white sub-pixels to adjust luminance, ensuring accurate color display across various grayscales without affecting the emission spectrum.
Implementation Method 1
Organic light-emitting diode (OLED) display panels
Implementation Method 2
k white sub-pixels for emitting white light
Implementation Method 3
m color sub-pixels for emitting color light
Data Source
AI summary
A display panel is provided. The display panel includes a driving back plate and a pixel layer disposed on a side of the driving back plate. The pixel layer includes a plurality of pixels, and the pixel includes m color sub-pixels for emitting color light and k white sub-pixels for emitting white light, wherein m and k are both integers greater than 1. The k white sub-pixels are configured to adjust the luminance of the pixel.