OLED Data Driver Segmentation for Heat and Power
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Solution Overview
Problem
Conventional organic light-emitting diode (OLED) display devices face challenges in maintaining image quality while reducing power consumption, as the data driver's current consumption and heat generation increase with varying gray levels, leading to instability and increased load.
Innovation Solution
The OLED display device employs a data driver that divides the gamma voltage into high and low gray level ranges, using dual amplification units to output these voltages separately, and a digital-analog converter controller to manage the output stages based on video data gray levels, allowing for efficient data voltage generation and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single resistor string and switching elements are used to generate data voltages across the entire gray level range, then the device structure is simple, but current consumption and heat generation increase significantly
Solution Approach 1:
The patent divides the gray level range into two segments: high gray levels (first gray level range) and low gray levels (second gray level range). A first set of switching elements controls high gray levels while a second set controls low gray levels. This segmentation allows the system to use appropriate switching elements for each gray level range, reducing overall current consumption and heat generation while maintaining the simplicity of the resistor string structure.
2Device complexity
If a single resistor string and switching elements are used to generate data voltages across the entire gray level range, then the device structure is simple, but heat generation increases
Solution Approach 1:
The patent segments the gray level control into two distinct sets of switching elements: a first set for high gray levels and a second set for low gray levels. This segmentation reduces the number of switching elements that need to operate simultaneously and reduces the overall heat generation by optimizing the switching behavior for each gray level range, while keeping the resistor string structure simple.
3Reliability
If the reference gamma voltage level is raised to handle high current consumption, then the data driver can maintain stability, but power consumption increases
Solution Approach 1:
The patent segments the switching elements into a first set and a second set, where the second set has higher on-resistance than the first set. This allows the system to use the first set (with lower on-resistance) for high gray levels requiring higher current, and the second set (with higher on-resistance) for low gray levels requiring lower current. This segmentation maintains data driver stability across all gray levels without requiring an overall increase in reference gamma voltage level, thereby avoiding increased power consumption.
4Use of energy by moving object
If different switching elements with different on-resistances are used for high and low gray levels, then current consumption is optimized, but device complexity increases
Solution Approach 1:
The patent segments the switching elements into two sets with different characteristics: a first set with lower on-resistance for high gray levels and a second set with higher on-resistance for low gray levels. This segmentation optimizes current consumption by matching switching element characteristics to gray level requirements. The complexity increase is minimized by using the same resistor string structure and only duplicating the switching element control logic, rather than redesigning the entire data driver architecture.
Data Source
AI summary
Disclosed are an organic light-emitting diode-based display device and a method for controlling the device. The device may include an organic light-emitting diode-based display panel; and a data driver configured for: dividing a reference gamma voltage into a first gamma voltage corresponding to a high gray level and a second gamma voltage corresponding to a low gray level; selecting one between the first and second gamma voltage based on a gray level of video data; and supplying the selected one through a corresponding output stage among dual output stages, wherein the dual output stages respectively correspond to the first and second gamma voltages.