OLED Display Power Reduction via Alternating Black Data
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Solution Overview
Problem
OLED display devices face challenges in maintaining image quality while reducing power consumption, leading to potential degradation and increased power usage.
Innovation Solution
The implementation of a driving circuit that alternately applies black data to sub-pixels in an OLED display device, adjusting luminance levels through a dimming mode by using a power supply with varying voltage levels and a timing controller to manage scan, data, and emission drivers, thereby reducing power consumption without significantly impacting image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the luminance of the display panel is reduced to lower power consumption, then power consumption is reduced, but image quality may deteriorate due to visible stripe patterns
Solution Approach 1:
The patent applies periodic action by alternating the application of black data to second sub-pixels between different frame periods. Specifically, black data is applied to second sub-pixels of even-numbered pixel rows during k-th frame periods, and then alternated to odd-numbered pixel rows during (k+1)-th frame periods. This periodic switching prevents stripe patterns from becoming visible while maintaining reduced luminance levels for lower power consumption.
Solution Approach 2:
The patent segments the pixel rows into odd-numbered and even-numbered groups, and further segments sub-pixels into first and second types within each pixel. This segmentation allows selective application of black data to specific sub-pixel groups in a staggered manner, preventing uniform stripe patterns while enabling power consumption reduction through dimming mode operation.
2Use of energy by moving object
If black data is continuously applied to all sub-pixels to reduce luminance, then power consumption is reduced, but stripe patterns become visible degrading image quality
Solution Approach 1:
The patent implements periodic action by timing the application of black data to different sub-pixel groups in alternating frame periods. Second sub-pixels in even-numbered pixel rows receive black data during k-th frame periods, while second sub-pixels in odd-numbered pixel rows receive black data during (k+1)-th frame periods. This temporal separation prevents simultaneous darkening of adjacent pixels that would create visible stripe patterns.
Solution Approach 2:
The patent applies dynamics by making the black data application pattern change over time rather than being static. The pattern dynamically switches between targeting even-numbered pixel rows and odd-numbered pixel rows in alternating frame periods, creating a moving average effect that prevents stationary stripe patterns from forming while maintaining reduced luminance for power savings.
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 effectively reduces power consumption while minimizing image quality degradation, preventing stripe patterns and maintaining visibility during dimming operations.
Implementation Method 1
OLED devices display images using organic light emitting diodes that emit light based on recombination of electrons and holes
Data Source
AI summary
An organic light emitting diode (OLED) display device includes a display panel including a plurality of pixel rows; a driving circuit configured to: provide a first display data to the plurality of pixel rows in a normal mode; provide a second display data including black data to the plurality of pixel rows in a dimming mode, in response to a mode signal; and decrease a second luminance of the display panel in the dimming mode to a level lower than a first luminance of the display panel in the normal mode; and a power supply configured to apply a lower power supply voltage and a high power supply voltage to the display panel, the power supply providing the mode signal.