OLED Signal Processor Dynamic Extension Coefficient for Color Distortion
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Solution Overview
Problem
In organic light emitting display devices (OLEDs) with a four-color system that includes a white light emitting pixel, the addition of a white pixel for increased luminance can distort color impressions, and existing methods to limit this distortion often result in reduced luminance, especially when displaying non-pure colors, and can lead to decreased operational lifetime and damage due to excessive current usage.
Innovation Solution
An organic light emitting display device with a signal processor that converts three-color image signals into four-color signals using a partial extension coefficient, which varies by region to minimize color distortion and optimize luminance, while also controlling current levels to prevent damage to the OLEDs, by calculating a distortion amount and adjusting the extension coefficient to ensure the current remains within a safe range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white light emitting pixel is added to increase luminance, then luminance is improved, but color impression is distorted
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the extension coefficient based on the distortion amount of color impression. The signal processor calculates the distortion amount for each pixel and modifies the extension coefficient accordingly, allowing the system to optimize luminance enhancement while maintaining color accuracy within acceptable ranges.
2Illumination intensity
If the extension coefficient is increased to maximize luminance, then luminance is improved, but current consumption increases causing OLED damage
Solution Approach 1:
The patent implements feedback by continuously monitoring the distortion amount of color impression and using this information to adjust the extension coefficient. The signal processor calculates the distortion amount for each pixel and feeds this information back to modify the luminance enhancement level, ensuring that both color accuracy and current consumption remain within safe operating ranges.
Solution Approach 2:
The patent applies dynamics by making the extension coefficient variable rather than fixed. The coefficient is dynamically adjusted based on the distortion amount calculated for each pixel and region, allowing the system to adapt luminance enhancement levels in real-time to prevent OLED damage while maximizing display quality.
3Manufacturing precision
If the extension coefficient is limited to prevent color distortion, then color impression is improved, but overall luminance decreases
Solution Approach 1:
The patent applies local quality by dividing the display into multiple regions and calculating distortion amounts separately for each region. The extension coefficient is then adjusted locally for each region based on its specific distortion characteristics, allowing luminance enhancement in regions where color distortion is minimal while maintaining color accuracy in regions where distortion would be problematic.
4Illumination intensity
If a fixed extension coefficient is used for the entire display, then device complexity is reduced, but luminance optimization and color accuracy cannot be simultaneously achieved
Solution Approach 1:
The patent applies segmentation by dividing the display into multiple regions and calculating distortion amounts separately for each region. This segmentation allows the system to apply different extension coefficients to different regions, optimizing both luminance and color accuracy locally while maintaining a manageable level of overall system complexity through systematic processing.
Data Source
AI summary
The present invention relates to an organic light emitting display device and a method for processing image signals thereof. An organic light emitting display device according to the present invention receives a plurality of input image signals respectively corresponding to the pixels representing a first color, a second color, a third color, and a white color, and converts the input image signals of at least two dots respectively representing the first color to the third color among the input image signals according to a first extension coefficient to generate a plurality of four-color image signals of at least two dots respectively representing the first color, the second color, the third color, and the white color, to respectively sum a distortion amount of a color impression of the four-color image signals of at least two dots, to calculate a partial extension coefficient corresponding to the sum result, and to extension-convert the input image signals of at least two dot according to the partial extension coefficient thereby generating the four-color output image signals of at least two dots.