Dual-Scan OLED Circuit Balancing Brightness via Asymmetric Pixel Assignment
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Solution Overview
Problem
The traditional dual-scan method for driving OLED displays often results in brightness differences between the upper and lower halves due to unavoidable electric characteristic differences between driving chips, leading to uneven light intensities and reduced product value.
Innovation Solution
A dual-scan circuit where pixels are alternately connected and driven by two chips, with specific patterns of pixel assignment to balance driving currents and average out brightness variations, ensuring consistent illumination across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the traditional dual-scan method divides the pixel array into two groups driven by two independent driving chips, then the addressing period is shortened, but brightness differences and uneven light intensities occur due to electric characteristic differences between the chips
Solution Approach 1:
The patent applies local quality by differentiating the connection patterns of different pixel groups to the two driving chips. Specifically, first pixel groups are connected to both chips in a first pattern, while second pixel groups are connected in a second pattern, allowing each region to be driven optimally to compensate for chip variations and achieve uniform brightness across the display
Solution Approach 2:
The patent employs asymmetry by using different connection patterns for different pixel groups rather than symmetric division. The first and second pixel groups have asymmetric connectivity arrangements to the driving chips, which balances the driving currents and compensates for the inherent differences between the two driving chips, thereby achieving uniform brightness
2Speed
If two independent driving chips are used to drive different groups of pixels, then the addressing speed is increased, but electric characteristic differences cause different driving currents and light intensities
Solution Approach 1:
The patent applies parameter changes by modifying the connection patterns between pixel groups and driving chips. By changing how pixels are assigned to chips (from simple spatial division to patterned connectivity), the driving current parameters are balanced across both chips, compensating for manufacturing variations and achieving consistent current delivery despite using two independent chips
3Loss of time
If pixels are divided into two groups for dual-scan driving, then the addressing period is halved, but brightness deviations appear between different regions of the display
Solution Approach 1:
The patent applies segmentation by dividing the pixel array into multiple pixel groups with different connectivity patterns rather than simply two large halves. This finer segmentation allows for more granular control over driving current distribution, enabling better compensation for chip variations and achieving uniform brightness while maintaining the speed benefits of dual-scan operation
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 solution effectively averages out brightness deviations, making the display appear more uniform and addressing user dissatisfaction with brightness imbalances, thus enhancing picture quality.
Implementation Method 1
The holes and the electrons combine in the light-emitting layer, and light with a specific wavelength is emitted from the light-emitting layer. It is worth noting that the light intensity emitted by the OLED display device is proportional to the driving current of the current source.
Data Source
AI summary
A luminescent display device is disclosed. The luminescent display device is comprised of an array of pixels, a first driving chip and a second driving chip. The array of pixels is comprised of columns and rows of pixels. The first driving chip is connected a first pixel of the array of pixels, and the second driving chip is connected to a second pixel of the array of pixels. The second pixel is adjacent to the first pixel. The first driving chip is not connected to all pixels in a row of the at least one row of pixels.