OLED Display Voltage Compensation for Initial Drive Errors
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience drive errors during initial operation, leading to issues like blinking, which impair reliability and picture quality due to incorrect power source current application to pixels.
Innovation Solution
The implementation of a compensating voltage system that includes a gate driving unit, data driving unit, power supply unit, and timing controller to manage power signals and voltages, using NMOS and PMOS switching devices to convert voltage levels and reduce voltage application periods, thereby preventing drive errors and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power source current is applied to pixels at initial driving, then the organic light emitting diode display device can be powered on, but drive errors occur causing blinking and reduced reliability
Solution Approach 1:
The timing controller supplies a preliminary compensating voltage to the compensating power line before supplying the first power signal to the power line. This preliminary action initializes the pixel circuits in a known state, preventing drive errors and blinking that would otherwise occur during initial power-on operation.
Solution Approach 2:
The compensating voltage is supplied in advance to counteract potential drive errors before they can manifest. By pre-initializing the pixel circuits with the compensating voltage, the system prevents the harmful blinking effect that would occur if power were applied directly without initialization.
2Reliability
If compensating voltage is supplied before converting level at initial driving, then voltage level conversion is required, but this adds complexity to the power supply system
Solution Approach 1:
The power supply unit is designed to perform multiple functions: it can supply both the compensating voltage and the main power signal, and it can perform voltage level conversion when needed. This multi-functionality consolidates what could be separate components into a single integrated unit, reducing overall system complexity while maintaining the ability to supply compensated voltages for reliability.
Data Source
AI summary
The present invention an organic light emitting diode display device includes a display panel having a plurality of pixel regions, a gate driving unit for driving gate lines and light emitting control lines of the display panel, a data driving unit for driving data lines of the display panel, a power supply unit for supplying first and second power signals to power lines of the display panel as well as a compensating voltage to a compensating power line, and a timing controller for controlling the gate and data driving units for displaying an image with a data voltage compensated with the compensating voltage and controlling the power supply unit to supply the compensating voltage after converting a level of the compensating voltage just before display of a first image on the display panel at an initial driving.