OLED Data Driver Charging Control for Heat Reduction
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Solution Overview
Problem
The existing organic light-emitting display (OLED) devices face significant heat generation issues due to unnecessary pre-charging and charge-sharing operations in the data driver, leading to increased power consumption and heat production, especially when these processes are performed during periods where the data voltage does not significantly vary.
Innovation Solution
The implementation of a method that detects the polarity of data signals and determines whether to perform pre-charging and charge-sharing based on the comparison with a reference data, allowing these operations only when necessary, thereby reducing unnecessary heat generation and power consumption by using individually controlled charging switches and charging capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-charging and charge-sharing operations are continuously performed in the data driver, then data charging property is enhanced, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent implements dynamic control of charging operations by detecting data voltage variation magnitude and selectively enabling pre-charging and charge-sharing only when variation exceeds a threshold. This dynamic adaptation allows the system to maintain reliable data charging when needed while avoiding unnecessary energy consumption during stable voltage periods
Solution Approach 2:
The system monitors the parameter of data voltage variation and changes the operational state of charging circuits based on detected thresholds. When voltage variation remains within a predetermined range, charging operations are disabled; when variation exceeds the threshold, charging operations are activated, thereby optimizing power consumption based on actual electrical conditions
2Reliability
If pre-charging and charge-sharing operations are continuously performed in the data driver, then data charging property is enhanced, but heat generation increases
Solution Approach 1:
The system dynamically adjusts charging operations based on real-time detection of data voltage variations. By enabling charging circuits only when voltage variation exceeds the predetermined threshold and disabling them during stable periods, the system maintains data charging reliability while minimizing heat generation from unnecessary continuous operations
Solution Approach 2:
The patent converts the potentially harmful effect of continuous charging operations (heat generation) into a beneficial conditional operation. By using voltage variation detection as a trigger, the system ensures charging operations occur only when electrically necessary, transforming what would be a continuous heat-generating process into a targeted, need-based operation that maintains performance while reducing thermal output
3Ease of operation
If individually controlled charging switches are implemented per data line, then precise control of pre-charging and charge-sharing is achieved, but device complexity increases
Solution Approach 1:
The patent divides the data driver into independently controllable segments, with each data line having its own charging switch controlled by a dedicated control signal. This segmentation enables precise individual control of pre-charging and charge-sharing operations for each data line, allowing the system to optimize charging based on specific electrical conditions of each line while maintaining modularity
Solution Approach 2:
Despite individual control switches, the patent employs a unified voltage variation detection mechanism and common control logic that serves all data lines. This universal detection and control approach reduces the overall complexity increase by sharing detection circuits and control algorithms across multiple independently controllable charging switches
Data Source
AI summary
Disclosed is an organic light emitting display device including: plurality of data lines; a charging line formed in a direction crossing the plurality of data lines; and charging switches connected between the charging line and the data lines. The charging line inputs a charging voltage and the charging switches are individually controlled in data line.