OLED Driver Algorithm Balances Peak Current and Power
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Solution Overview
Problem
Existing methods for driving matrix display devices, such as passive matrix organic light-emitting diode (PM OLED) displays, are either inefficient or complex, and they fail to effectively balance peak current consumption and drive time periods, leading to high power consumption.
Innovation Solution
A method and apparatus that use a calculation unit to split image data into different planes by calculating common and residual drive values for each column and row, allowing for efficient display driving with minimal computation passes, thereby optimizing power usage and simplifying the design of display drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing methods for driving matrix display devices are used, then the display can be operated, but power consumption is high due to unbalanced peak current and drive time periods
Solution Approach 1:
The image data is divided into multiple planes based on brightness levels, with each plane containing pixels of similar luminance characteristics. This segmentation allows the driver to optimize current and timing parameters for each plane independently, reducing overall power consumption while maintaining display quality.
Solution Approach 2:
The patent applies pulse width modulation (PWM) with varying duty cycles for different planes. By changing the temporal parameters of the drive signals according to the brightness requirements of each plane, the system achieves efficient power management while balancing peak current demands and drive time periods.
2Use of energy by moving object
If complex driving methods are used to reduce power consumption, then power efficiency improves, but device complexity increases
Solution Approach 1:
The image data is pre-processed into multiple planes before being sent to the display driver. This preliminary organization of data by brightness levels simplifies the driver's task, as it only needs to apply predetermined PWM patterns to each plane rather than performing complex real-time calculations, thus reducing driver complexity while maintaining power efficiency.
Solution Approach 2:
The display driver operates by sequentially activating different planes in a periodic manner using PWM techniques. This periodic structure simplifies the driver design compared to continuous control methods, as it uses straightforward timing and switching operations to achieve efficient power consumption across different brightness levels.
Data Source
AI summary
Systems and methods for realizing display drivers, especially OLED drivers having a high efficiency. With a single pass, using an algorithm based on simple equations based on gathered maximum display data, the driver can split an image to be displayed into multiple planes and tiles thus balancing peak current consumption. Furthermore the driver is able to optimize drive time periods in regard of many parameters.