Subpixel Compensation Circuit for Uniform Low-Gradation Display
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Solution Overview
Problem
Display devices suffer from display defects such as low-gradation unevenness due to driving current deviation caused by differences in characteristics of driving transistors, leading to non-uniform display quality.
Innovation Solution
A display device with a compensation circuit that compensates for driving current deviations by applying a compensation voltage to subpixels, minimizing current discrepancies through threshold voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving signals are supplied to subpixels without compensation, then the display device can operate, but driving current deviation occurs due to differences in driving transistor characteristics, causing display defects such as low-gradation unevenness
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation before the main driving operation. A compensation transistor is used to pre-adjust the gate voltage of the driving transistor, storing the threshold voltage information in a compensation capacitor. This preliminary compensation ensures that subsequent driving currents are uniform across all subpixels, preventing display defects like low-gradation unevenness before they occur.
Solution Approach 2:
The patent introduces a compensation transistor as an intermediary element between the data signal input and the driving transistor gate. This compensation transistor acts as a mediator that adjusts the gate voltage based on the threshold voltage characteristics, enabling uniform driving currents without requiring complex circuit restructuring. The intermediary compensation mechanism resolves the contradiction by adding a simple compensating element rather than redesigning the entire driving circuit.
2Manufacturing precision
If threshold voltage compensation is applied to compensate for driving current deviation, then display quality is uniformized, but additional compensation circuits and voltages are required
Solution Approach 1:
The patent applies local quality by implementing compensation at the individual subpixel level rather than using a global compensation approach. Each subpixel has its own compensation transistor and capacitor that locally adjust for threshold voltage variations specific to that transistor. This localized compensation achieves precise current uniformity across all subpixels while keeping each compensation circuit simple and modular, avoiding the need for complex centralized compensation systems.
Data Source
AI summary
Provided is a display device. The display device includes a display panel including a subpixel, The subpixel includes a compensation circuit configured to compensate for a driving current generated from a driving transistor based on a compensation voltage input from outside of the sub-pixel.