OLED Pentile Display Grayscale Correction for Color Shift Elimination
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Solution Overview
Problem
Organic light emitting diode (OLED) displays with a pentile pixel structure suffer from color shift issues, resulting in a reddish tinge on the left outermost vertical line and a greenish tinge on the right outermost vertical line, which adversely affect image quality due to reduced aperture ratio and luminance as resolution increases.
Innovation Solution
A display device and driving method that alternately arrange first and second horizontal lines with specific pixel configurations, including red, green, and blue pixels, and utilize a signal controller to detect and correct input video signals with grayscales above threshold values, generating a video data signal to apply data voltages and correct grayscale imbalances, thereby eliminating color shift phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased, then image quality is improved, but aperture ratio is reduced causing lower luminance
Solution Approach 1:
The patent applies local quality by differentiating the treatment of outermost vertical lines from inner vertical lines. Specifically, pixels on outermost vertical lines (which suffer from color shift) receive corrected grayscale values, while pixels on inner vertical lines maintain original grayscale values. This localized differentiation resolves the color shift issue without affecting overall image quality or luminance.
Solution Approach 2:
The patent changes the grayscale parameter for pixels on outermost vertical lines by comparing it with a threshold value and adjusting it when necessary. This parameter modification corrects the color shift caused by the pentile structure while maintaining the high resolution, thereby preserving both image quality and luminance.
2Area of stationary object
If pentile pixel structure is used, then aperture ratio is improved, but color shift occurs on outermost vertical lines
Solution Approach 1:
The patent applies local quality by differentiating the treatment of outermost vertical lines from inner vertical lines. Specifically, pixels on outermost vertical lines (which suffer from color shift) receive corrected grayscale values, while pixels on inner vertical lines maintain original grayscale values. This localized differentiation resolves the color shift issue without affecting overall image quality or luminance.
Solution Approach 2:
The patent changes the grayscale parameter for pixels on outermost vertical lines by comparing it with a threshold value and adjusting it when necessary. This parameter modification corrects the color shift caused by the pentile structure while maintaining the high resolution, thereby preserving both image quality and luminance.
3Object-generated harmful factors
If grayscale correction is applied to outermost vertical lines, then color shift is eliminated, but processing complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of outermost vertical lines from inner vertical lines. Specifically, pixels on outermost vertical lines (which suffer from color shift) receive corrected grayscale values, while pixels on inner vertical lines maintain original grayscale values. This localized differentiation resolves the color shift issue without affecting overall image quality or luminance.
Solution Approach 2:
The patent changes the grayscale parameter for pixels on outermost vertical lines by comparing it with a threshold value and adjusting it when necessary. This parameter modification corrects the color shift caused by the pentile structure while maintaining the high resolution, thereby preserving both image quality and luminance.
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 improves image quality by eliminating color shift on the outermost vertical lines, enhancing the display's luminance and aperture ratio by correcting grayscale imbalances in the pentile pixel structure.
Implementation Method 1
the organic light emitting diode (OLED) includes an anode layer and a cathode layer for forming an electric field, and an organic light emitting material in the electric field for emitting light in response to the electric field
Data Source
AI summary
A display device is disclosed. The display device includes a first horizontal line having a first sequence of colored pixels, and a second horizontal line having a second sequence of colored pixels. The display device also includes a signal controller for detecting a first input video signal and a second input video signal for pixels respectively disposed on a left outermost vertical line and a right outermost vertical line of the display from an input video signal. The signal controller also corrects the first input video signal and the second input video signal so that they have grayscales that are less than a threshold value. The image quality characteristic is improved by removing the color shift phenomenon of the right and left outermost vertical lines in the display device.