OLED Driving Method for Luminance Uniformity
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Solution Overview
Problem
The existing methods for driving organic light emitting diode (OLED) display devices suffer from reduced luminance uniformity due to noise and voltage fluctuations, particularly at low gray levels, leading to non-uniform image display and increased vulnerability to noise in the data voltage of red, green, and blue sub-pixels compared to the white sub-pixel.
Innovation Solution
A method of driving OLED display devices that involves judging the gray level of image data to adjust the luminance ratio and data voltage of red, green, blue, and white sub-pixels, where the white sub-pixel is either excluded or its luminance is adjusted based on the gray level group, ensuring consistent current flow through each sub-pixel to maintain uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the data voltage of red, green, and blue sub-pixels is reduced to lower power consumption, then power consumption decreases, but luminance uniformity deteriorates due to noise at low gray levels
Solution Approach 1:
The invention segments the sub-pixels into two groups: red, green, and blue sub-pixels (first group) and white sub-pixel (second group). Different data voltages are applied to each group based on gray level, allowing optimized power consumption while maintaining luminance uniformity in the first group by excluding it from white sub-pixel luminance calculations at low gray levels.
Solution Approach 2:
The invention dynamically changes the data voltage parameters applied to sub-pixels based on the gray level of displayed images. At low gray levels, the data voltage for red, green, and blue sub-pixels is optimized to maintain uniformity, while at high gray levels, the white sub-pixel is activated with appropriate voltage to achieve desired luminance and color temperature.
2Illumination intensity
If the white sub-pixel is used to increase brightness and reduce power consumption, then brightness increases and power consumption decreases, but luminance uniformity deteriorates at low gray levels due to voltage differences
Solution Approach 1:
The invention dynamically adjusts the luminance ratio and data voltage allocation among sub-pixels based on the displayed gray level. At low gray levels, the white sub-pixel is excluded from luminance calculations for red, green, and blue channels to maintain uniformity. At high gray levels, the white sub-pixel is actively used to enhance brightness and reduce power consumption, demonstrating dynamic adaptation to different display conditions.
Solution Approach 2:
The invention changes the operational parameters (luminance ratio and data voltage) of the white sub-pixel based on gray level. At low gray levels, the white sub-pixel parameter is adjusted to be excluded from color channel calculations. At high gray levels, the white sub-pixel parameters are optimized to provide maximum brightness enhancement with minimal power consumption while maintaining color accuracy.
3Use of energy by moving object
If four-color sub-pixels (red, green, blue, white) are used instead of three-color sub-pixels, then brightness increases and power consumption decreases, but device complexity increases
Solution Approach 1:
The white sub-pixel serves multiple functions: it provides brightness enhancement, reduces power consumption, and maintains color temperature. By using the white sub-pixel in combination with red, green, and blue sub-pixels at high gray levels, the system achieves multi-functionality with a single additional sub-pixel type, optimizing both performance and efficiency.
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
This approach enhances luminance uniformity by adjusting the data voltage of sub-pixels according to the gray level, minimizing noise influence and maintaining high-quality image display with improved optical properties and reduced voltage differences between sub-pixels.
Implementation Method 1
an organic light emitting diode (OLED) display device
Data Source
AI summary
A method of driving an organic light emitting diode display device having first to third sub-pixels and a white sub-pixel comprises judging a gray level of an image data; classifying the image data into a low gray level group, a middle gray level group and a high gray level group; displaying an image using the first to third sub-pixels except the white sub-pixel when the gray level of the image data is classified into the low gray level group; and displaying the image using the first to third sub-pixels and the white sub-pixel when the gray level of the image data is classified into one of the middle and high gray level groups.