OLED Power Voltage Compensation Circuit for Noise Reduction
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Solution Overview
Problem
Noise in the power supply of OLED displays can cause variations in the reference voltage, leading to inconsistent luminance across pixels, which affects picture quality by making each pixel express a different gray scale value than intended.
Innovation Solution
A power voltage compensation unit is introduced, comprising inverting and non-inverting amplifying units, variable resistors, and a comparator, which generates a compensation power voltage by amplifying and integrating feedback power voltage differences to reduce noise and stabilize the reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference voltage is supplied from the power supply source to initialize the gate electrode, then the pixel can be properly initialized, but noise in the display panel causes the reference voltage to include noise, resulting in incorrect gray scale values and reduced picture quality
Solution Approach 1:
The patent introduces a feedback mechanism where the noisy reference voltage from the power supply source is fed back through an operational amplifier circuit. The operational amplifier compares the feedback voltage with a clean reference voltage and generates a compensated reference voltage that cancels out the noise components, thereby providing a noise-free initialization voltage to the gate electrode.
Solution Approach 2:
The operational amplifier circuit acts as an intermediary between the noisy power supply source and the pixel's gate electrode. It processes the noisy reference voltage through amplification and feedback, producing a cleaned reference voltage that eliminates noise while preserving the intended voltage level for proper pixel initialization.
2Object-affected harmful factors
If noise is present in the reference voltage, then the gate electrode receives incorrect voltage, but adding a compensation circuit increases device complexity
Solution Approach 1:
The compensation circuit uses a feedback loop with an operational amplifier that takes the noisy reference voltage as input, compares it with a clean reference, and outputs a compensated voltage. This feedback mechanism automatically adjusts the output to cancel noise without requiring complex external control circuits.
Solution Approach 2:
The operational amplifier circuit is self-regulating through its feedback mechanism. It automatically detects and compensates for noise in the reference voltage without requiring external intervention or complex control logic, thereby reducing overall system complexity while achieving noise reduction.
Data Source
AI summary
An organic light emitting display includes a power supply source and a power voltage compensation unit. The power supply source supplies at least a first power voltage to a first power voltage line of the display. The power voltage compensation unit to generate a first compensation power voltage based on the first power voltage and a feedback power voltage from the first power voltage line. The first power voltage compensation unit outputs the first compensation power voltage to the first power voltage line.