OLED Driving Apparatus Using Segmented Blue Sub-Pixels
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Solution Overview
Problem
Organic light emitting display devices face challenges in balancing service life and color reproducibility due to the limitations of blue organic light emitting materials, with sky-blue materials offering low image quality and deep-blue materials having short service life and high power consumption.
Innovation Solution
A driving apparatus and method for organic light emitting display devices that include a display panel with red, green, and two types of blue sub-pixels, a data converter for gamma correction and color coordinate conversion, and a timing controller for aligning image data, allowing selective emission from first and second blue sub-pixels based on color gamut determination, thereby extending service life and enhancing color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If sky-blue organic light emitting material is used, then service life is extended and power consumption is reduced, but color reproduction rate deteriorates
Solution Approach 1:
The blue sub-pixel is segmented into two independent components: first blue sub-pixel using sky-blue organic light emitting material and second blue sub-pixel using deep-blue organic light emitting material. This segmentation allows each component to specialize - the sky-blue component provides long service life while the deep-blue component provides excellent color reproduction, resolving the contradiction between durability and color quality.
2Manufacturing precision
If deep-blue organic light emitting material is used, then color reproduction rate is improved, but service life is shortened and power consumption increases
Solution Approach 1:
The blue sub-pixel is segmented into two independent components: first blue sub-pixel using sky-blue organic light emitting material and second blue sub-pixel using deep-blue organic light emitting material. This segmentation allows each component to specialize - the sky-blue component provides long service life while the deep-blue component provides excellent color reproduction, resolving the contradiction between durability and color quality.
3Device complexity
If a single blue sub-pixel is used, then device complexity is reduced, but color gamut and image quality are limited
Solution Approach 1:
The blue sub-pixel is segmented into two independent components: first blue sub-pixel using sky-blue organic light emitting material and second blue sub-pixel using deep-blue organic light emitting material. This segmentation allows each component to specialize - the sky-blue component provides long service life while the deep-blue component provides excellent color reproduction, resolving the contradiction between durability and color quality.
4Manufacturing precision
If four-color image data processing is implemented, then color accuracy is improved, but data processing complexity increases
Solution Approach 1:
The data converter performs preliminary actions by pre-processing the input image data through gamma correction and color coordinate conversion before the data reaches the display panel. This preliminary processing converts RGB data to appropriate drive signals for the four sub-pixels (R, G, B1, B2), enabling accurate color reproduction while simplifying the overall system architecture by consolidating complex processing in a dedicated unit.
Data Source
AI summary
Disclosed are an apparatus and method for driving an organic light emitting display device. The driving apparatus includes a display panel, a data converter, a timing controller, and a panel driver. The data converter gamma-corrects three-color input data having red, green, and blue, performs color coordinate conversion based on the gamma-corrected blue data to generate three-color conversion data and a color gamut determination signal, inversely gamma-corrects the three-color conversion data, and generates four-color image data to be supplied to a unit pixel according to the color gamut determination signal on the basis of the three-color input data and the inversely gamma-corrected three-color conversion data.