OLED Driver IC Temperature-Compensated Cathode Voltage Control
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Solution Overview
Problem
Organic light emitting displays face inefficiencies due to fixed voltage settings for the second power source, which are set based on low temperatures, leading to increased power consumption at room temperature.
Innovation Solution
An organic light emitting display system that includes a driver IC with a temperature sensor and a DC-DC converter to dynamically adjust the voltage of the second power source based on ambient temperature, using a control signal to optimize voltage levels for improved efficiency without requiring additional wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage of the second power source is set based on low temperature driving margin, then the display can operate reliably at low temperatures, but power consumption increases at room temperature
Solution Approach 1:
The voltage of the second power source is made dynamically adjustable based on temperature conditions. The system transitions from a fixed voltage design to a dynamic voltage control mechanism that adapts to ambient temperature changes, thereby optimizing power consumption while maintaining reliable operation across different temperature ranges
Solution Approach 2:
The invention changes the voltage parameter of the second power source according to temperature variations. By implementing temperature-dependent voltage adjustment, the system optimizes the operating parameters to reduce power consumption at room temperature while ensuring sufficient voltage margin for low temperature operation
2Use of energy by moving object
If additional temperature sensing and voltage control circuits are added, then voltage can be adjusted according to temperature, but device complexity increases
Solution Approach 1:
The second power source circuit is designed to perform multiple functions: it provides the cathode voltage for OLED operation and simultaneously serves as the output of the DC-DC converter that can be dynamically controlled. This multi-functionality reduces the need for separate dedicated temperature compensation circuits, thereby limiting the increase in device complexity
Solution Approach 2:
A temperature sensing mechanism provides feedback to the DC-DC converter control system, which then adjusts the second power source voltage accordingly. This feedback loop enables automatic temperature-compensated voltage adjustment without requiring complex manual intervention or additional dedicated control hardware
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for reduced power consumption by adjusting the second power source voltage according to ambient temperature, enhancing the efficiency of the display and eliminating the need for increased voltage margins, while maintaining image quality.
Implementation Method 1
a driver IC configured to drive a pixel unit and to generate a control signal in accordance with an ambient temperature
Implementation Method 2
a DC-DC converter configured to generate a first power source and a second power source from an input voltage
Implementation Method 3
organic light emitting diodes (OLED) that generate light by re-combination of electrons and holes generated to correspond to the flow of current
Data Source
AI summary
An organic light emitting display, and a method of driving the same, controls the voltage of a second power source in accordance with an ambient temperature. The organic light emitting display includes a driver IC configured to drive a pixel unit and to generate a control signal in accordance with an ambient temperature, and a DC-DC converter configured to generate a first power source and a second power source from an input voltage, to change a voltage of the second power source in accordance with the control signal from the driver IC, and to output the changed voltage of the second power source and the first power source.