OLED Voltage Compensation Circuit for Display Uniformity
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Solution Overview
Problem
Organic light emitting displays face challenges in maintaining optimal voltage levels for driving power, which can be affected by variations in components during assembly or replacement of power circuit boards, leading to inconsistent gray scale expression and potential degradation of display quality.
Innovation Solution
Incorporating a voltage detection unit and a voltage compensation circuit that compares detected voltage data with stored reference data to adjust the power supply circuit's output, ensuring the voltage level is set based on pre-defined values for both emission and non-emission periods, using a power management IC, analog-digital converter, EEPROM, microcontroller unit, and digital-analog converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage level is adjusted based on component variations, then display quality uniformity is improved, but device complexity increases due to additional voltage detection and compensation circuits
Solution Approach 1:
The patent implements a feedback mechanism where the voltage detection unit continuously monitors the driving power voltage, compares it with reference voltage data stored in memory, and feeds back compensation signals to the power supply circuit. This closed-loop feedback system automatically adjusts voltage levels to compensate for component variations, ensuring uniform display quality across different panels while managing complexity through automated control.
Solution Approach 2:
The patent introduces intermediary components including a voltage detection unit that measures actual voltage, a compensation circuit that calculates required adjustments, and memory devices that store reference voltage data. These intermediaries act as mediators between the power supply circuit and display panel, enabling precise voltage control without requiring direct manual intervention or complex redesign of the entire system.
2Manufacturing precision
If voltage compensation circuit is added, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing reference voltage data in memory devices during the manufacturing process. The voltage compensation circuit uses these pre-stored references to automatically adjust driving power voltage levels, eliminating the need for manual voltage calibration for each display panel. This preliminary preparation of reference data simplifies the overall manufacturing process despite adding electronic components.
Solution Approach 2:
The voltage compensation system operates autonomously using self-service principles. The voltage detection unit automatically detects voltage levels, the compensation circuit independently calculates required adjustments based on stored references, and the system self-regulates without external intervention. This self-service capability reduces the need for manual calibration and testing during manufacturing and quality control.
Data Source
AI summary
An organic light emitting display includes a display panel, a power supply circuit, a voltage detection unit and a voltage compensation unit. The display panel includes a plurality of pixels. The power supply circuit outputs a first power source to the display panel. The voltage detection unit is positioned between the display panel and the power supply circuit, and detects a detection voltage data of the first power source output from the power supply circuit. The voltage compensation unit compares the detection voltage data with a previously stored reference voltage data, and controls the power supply circuit to output the first power source having a voltage level set based on the reference voltage data.