OLED Display Compensation via Color-Grouped Sensing
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Solution Overview
Problem
Manufacturing limitations in Organic Light Emitting Diode (OLED) displays result in fluctuations in electrical parameters of driving transistors, leading to current and brightness variations, causing afterimages and affecting display quality.
Innovation Solution
A method and apparatus that sense electrical signals from sub-pixels of different colors within each image frame, dispersing the sensing across multiple pixel units to reduce noise and heat concentration, thereby improving afterimage compensation and display effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical signals are sensed from sub-pixels of the same color across multiple frames, then sensing precision can be improved through accumulation, but noise concentration and heat generation increase, causing afterimage effects
Solution Approach 1:
The patent segments the sensing operation by color type, distributing sensing of different colored sub-pixels across different display frames. Specifically, first-color sub-pixels are sensed in first display frames while second-color sub-pixels are sensed in second display frames, preventing concentration of sensing operations on a single color group and thereby reducing localized noise accumulation and heat generation that cause afterimages.
Solution Approach 2:
The patent implements periodic sensing cycles where different color groups are sensed alternately in different display frames. This periodic distribution ensures that no single color group undergoes continuous intensive sensing, allowing thermal and electrical recovery periods that prevent afterimage formation while maintaining overall sensing precision through systematic accumulation across the periodic cycle.
2Productivity
If sensing operations are concentrated on sub-pixels of one color, then sensing efficiency for that color improves, but noise and heat concentration degrades display quality
Solution Approach 1:
The patent divides the sensing task into segments corresponding to different color groups, with each display frame dedicated to sensing a specific color group. This segmentation maintains high sensing efficiency for each color group within its allocated frames while preventing noise concentration by distributing the total sensing load across multiple color groups and frames.
Solution Approach 2:
The patent employs periodic action by alternating between different color group sensing operations in successive display frames. This periodic distribution allows each color group to be sensed efficiently during its designated frames while providing rest periods that prevent noise accumulation, thereby maintaining high productivity without degrading display quality through noise concentration.
3Device complexity
If electrical parameters of driving transistors are not compensated, then device complexity remains low, but manufacturing limitations cause brightness variations and afterimages
Solution Approach 1:
The patent implements a self-service compensation mechanism where the display device performs its own electrical parameter sensing and compensation without requiring external calibration equipment or complex additional circuits. The pixel driving circuits themselves are utilized to sense electrical signals from light-emitting elements, and compensation is performed by adjusting driving waveforms based on sensed threshold voltages and mobility values, achieving reliable display quality through self-diagnosis and self-correction.
Solution Approach 2:
The patent applies universality by using the existing pixel driving circuits to perform multiple functions: both driving the light-emitting elements and sensing their electrical parameters. The sensing lines and pixel driving circuits serve dual purposes, eliminating the need for separate dedicated sensing circuits and reducing overall device complexity while enabling comprehensive electrical parameter compensation for reliable display quality.
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 disperses sensing noise and heat, reducing afterimage effects and enhancing display quality by sensing electrical signals from sub-pixels of different colors within each image frame across multiple pixel units, improving the overall display performance.
Implementation Method 1
the pixel driving circuit includes a sensing line for sensing an electrical signal from the light-emitting element
Data Source
AI summary
A method and an apparatus of compensating a display device, and the display device are provided. The display device includes pixel units in multiple rows and multiple columns, each of the pixel units includes sub-pixels having different colors, and each of the sub-pixels includes a pixel driving circuit and a light-emitting element connected to the pixel driving circuit, the pixel driving circuit includes a sensing line for sensing an electrical signal from the light-emitting element. The method includes: sensing electrical signals from light-emitting elements of sub-pixels having at least two different colors by using sensing lines corresponding to the sub-pixels having the at least two different colors within a display period of each image frame, wherein the subpixels having the at least two different colors are within different pixel units of the pixel units.