OLED Pixel Driving Circuit Merging Sampling and Programming
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Solution Overview
Problem
The complexity of pixel driving circuits in organic light emitting diode (OLED) display devices increases the 1 horizontal period, limiting the ability to drive high-resolution screens due to the need for multiple switching TFTs and capacitors, which complicates the timing of signal control and results in luminance differences between pixels.
Innovation Solution
The implementation of a pixel driving circuit that simultaneously performs sampling and programming during the 1 horizontal period by using a configuration with multiple switching elements and capacitors, allowing for separate connections of data and reference voltage lines, thereby reducing the 1 horizontal period and enabling higher resolution at the same driving frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple switching TFTs and capacitors are added to compensate for threshold voltage differences and mobility variations, then image quality is improved, but the 1 horizontal period increases and device complexity increases
Solution Approach 1:
The patent combines the sampling operation and programming operation into a single simultaneous execution phase. The pixel driving circuit performs both sampling of the data signal and programming of the compensation voltage at the same time during one horizontal period, rather than sequentially. This merging of operations reduces the total time required and simplifies the circuit timing requirements while maintaining the compensation functionality.
Solution Approach 2:
The pixel driving circuit is designed to perform multiple functions simultaneously: it samples the data signal, programs the compensation voltage for threshold voltage compensation, and controls the light emission all within the same horizontal period. This multi-functionality approach allows the circuit to maintain high image quality through compensation while reducing the overall operation time and horizontal period duration.
2Manufacturing precision
If multiple switching TFTs and capacitors are added to compensate for threshold voltage differences and mobility variations, then image quality is improved, but the 1 horizontal period increases
Solution Approach 1:
The patent merges the sampling operation and programming operation into a single simultaneous execution phase. By performing both operations at the same time rather than sequentially, the total duration of the horizontal period is reduced while still achieving the necessary compensation for threshold voltage differences and mobility variations, thereby maintaining image quality.
Solution Approach 2:
The pixel driving circuit maintains continuous useful action by overlapping the sampling and programming operations in time. Instead of completing one operation before starting the other, the circuit executes both operations concurrently, ensuring that no time is wasted and the horizontal period is minimized while still achieving full compensation functionality.
3Speed
If the pixel driving circuit is simplified to reduce the 1 horizontal period, then driving frequency is improved, but compensation capability for threshold voltage differences is reduced
Solution Approach 1:
The patent merges sampling and programming into a single simultaneous operation, which simplifies the overall circuit timing and allows for a shorter horizontal period. This merging enables the circuit to maintain full compensation capability for threshold voltage differences and mobility variations while achieving higher driving frequencies due to the reduced operation time.
Solution Approach 2:
The pixel driving circuit is designed as a multi-functional unit that simultaneously performs sampling, programming, and compensation operations. This universal design allows the circuit to maintain robust compensation capability for threshold voltage differences while operating at higher driving frequencies, as all necessary functions are executed in parallel rather than requiring separate circuit stages.
Data Source
AI summary
An organic light emitting diode display device and a method for driving the same are provided. The organic light emitting diode display device includes an organic light emitting diode disposed on each of a plurality of pixels, and a pixel driving circuit configured to drive the organic light emitting diode.