Display Pixel Circuit Compensation Voltage Line
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Solution Overview
Problem
Current display devices face challenges in improving resolution due to limitations in the connection and driving of light emitting devices, which affect the reliability and performance of the display panel.
Innovation Solution
The proposed display device incorporates a pixel circuit structure with specific transistors and capacitors connected to a compensation voltage line, allowing direct application of a compensation voltage to a driving transistor, enhancing the driving current and luminance uniformity by compensating for the threshold voltage of the transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel circuit structure is used, then the display panel can be manufactured with standard components, but the resolution and luminance uniformity are limited due to inability to compensate for transistor threshold voltage variations
Solution Approach 1:
The patent applies parameter changes by introducing a compensation voltage line that dynamically adjusts the gate voltage of the driving transistor based on its threshold voltage characteristics. This allows the system to compensate for manufacturing variations in transistor parameters, achieving uniform luminance across different pixels without requiring complex custom circuit designs for each pixel.
Solution Approach 2:
The patent implements feedback by measuring the actual threshold voltage of each transistor and using this information to adjust the gate voltage through the compensation voltage line. This closed-loop approach ensures that each pixel maintains consistent luminance output despite variations in transistor characteristics, resolving the contradiction between manufacturing precision and device complexity.
2Illumination intensity
If the driving current is increased to improve luminance, then the display brightness is enhanced, but the transistor threshold voltage variations cause non-uniform luminance across the display panel
Solution Approach 1:
The patent changes the gate voltage parameter dynamically by introducing a compensation voltage line that adjusts the gate voltage based on the transistor's threshold voltage characteristics. This allows the driving current to be optimized for maximum luminance while compensating for threshold voltage variations, achieving both high brightness and uniform luminance across the display panel.
3Ease of manufacture
If transistor characteristics are standardized to simplify manufacturing, then production is easier, but variations in threshold voltage reduce display reliability and resolution
Solution Approach 1:
The patent implements feedback by measuring the actual threshold voltage of each transistor and using this information to adjust the gate voltage through the compensation voltage line. This allows the system to maintain display reliability and performance consistency despite variations in transistor characteristics, while still using standardized manufacturing processes.
Solution Approach 2:
The patent applies parameter changes by introducing a compensation voltage line that dynamically adjusts the gate voltage based on transistor threshold voltage characteristics. This allows standardized transistors with inherent variations to perform consistently, maintaining reliability without requiring complex custom fabrication processes.
Data Source
AI summary
A display device includes a display panel including a pixel, and a panel driver that drives the display panel. The pixel includes a light emitting device electrically connected to a first power line, a first transistor electrically connected to a cathode of the light emitting device and operating depending on a potential of a first node, a second transistor electrically connected between a data line and a second node, a third transistor electrically connected between a reference voltage line and the second node, a first capacitor electrically connected between the first node and the second node, a second capacitor electrically connected between a third node disposed between the first capacitor and the second node and the first power line, and a fourth transistor electrically connected between the first transistor and a compensation voltage line.