OLED Data Line Precharging for Power Reduction
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Solution Overview
Problem
Organic light emitting display devices consume high electric current to emit bright light, which is a barrier for their widespread use in portable devices due to high power consumption.
Innovation Solution
The device includes a data driver with a switch unit that selectively couples data lines to either a data drive power source or a buffer unit, allowing for precharging during one period and charging during another, reducing power consumption by minimizing the use of a boost power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic light emitting display device emits bright light using high electric current, then the luminance and brightness are improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by precharging the data lines before actual data signal transmission. The data lines are charged to a predetermined voltage level in advance, so that when data signals need to be transmitted, the lines are already in a state ready for rapid signal propagation, reducing the energy required during active display operation
Solution Approach 2:
The data driving period is divided into multiple sub-periods including a precharge period and a data signal transmission period. This segmentation allows the system to separate the energy-intensive charging operation from the data transmission operation, enabling optimized power management where precharging occurs only when necessary rather than continuously
2Reliability
If the data lines are continuously charged to maintain signal integrity, then the signal quality is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by charging the data lines only during specific precharge periods rather than continuously. The charging operation is performed periodically at the beginning of data driving periods or when voltage thresholds are not met, allowing the system to maintain signal integrity while consuming power only when necessary rather than continuously
3Speed
If the data lines are precharged before data signal transmission, then the data signal transmission speed is improved, but the power consumption increases
Solution Approach 1:
The data lines are precharged in advance before actual data signal transmission begins. This preliminary charging action ensures that when data signals need to be transmitted, the lines are already in a high-impedance state ready for rapid signal propagation, reducing the energy required during active data transmission operations
Solution Approach 2:
The patent dynamically adjusts the charging strategy based on detected voltage levels. The controller monitors the voltage on data lines and selectively activates precharging only when the voltage does not meet a predetermined threshold, making the system adaptive rather than static, thereby optimizing the balance between transmission speed and power consumption
Data Source
AI summary
An organic light emitting display device having low power consumption is disclosed. Power in the device is saved by precharging data lines if the data of the current frame has a higher voltage than the data of the previous frame. Accordingly, if the data lines are precharged the data line driving buffer does not need to use as much power.