OLED Data Driver Bit Reordering for Power Reduction
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Solution Overview
Problem
Analog driving techniques for OLED displays face challenges in accurately displaying gray levels due to individual voltage storage in each pixel, leading to inefficiencies and increased power consumption as the number of pixels increases.
Innovation Solution
A method of digitally driving OLED displays by modifying the input order of data bits for sub-frames, calculating power consumption, and adjusting the data bit input order to minimize logical value transitions, thereby reducing power consumption and maintaining accurate gray level representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog driving technique is used to display gray levels using voltage stored in storage capacitor, then the display can operate with simple circuitry, but the gray level representation becomes inaccurate due to individual voltage storage variations
Solution Approach 1:
The patent replaces the analog voltage-based driving mechanism with a digital driving mechanism. Instead of storing and using analog voltages in storage capacitors, the system uses digital data bits to control sub-frame display periods. This substitution eliminates the inaccuracies caused by voltage storage variations while maintaining manageable circuit complexity through digital signal processing.
Solution Approach 2:
The patent changes the fundamental parameter from analog voltage magnitude to digital time-based control. By controlling the display period of sub-frames through digital data bits rather than storing voltage values, the system achieves accurate gray level representation through temporal modulation instead of analog amplitude modulation.
2Use of energy by moving object
If data bits are input in conventional order to data driving circuit, then the circuit operation is simple, but power consumption increases due to frequent logical value transitions
Solution Approach 1:
The patent introduces dynamic reordering of data bit input sequences based on the specific display content and sub-frame requirements. Rather than using a fixed input order, the system adaptively adjusts the data bit sequence to minimize logical transitions, thereby reducing power consumption while maintaining operational simplicity through automated control.
Solution Approach 2:
The system performs preliminary analysis of the data bits and display requirements before generating the input sequence. By pre-calculating the optimal data bit ordering that minimizes logical transitions, the system reduces power consumption without requiring complex real-time adjustments during the data input process.
Data Source
AI summary
A method of digitally driving an organic light-emitting diode (OLED) display is disclosed. In one aspect, the method includes calculating a first power consumption of a data driver for a first frame while first data bits are input to the data driver. The first data bits are input to the data driver in a data bit input order. The method also includes modifying the data bit input order and inputting second data bits to the data driver for a second frame in the modified data bit input order when the first power consumption is greater than a threshold power consumption.