Display Driving Circuit With Dynamic Bias for Uniform Luminance
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Solution Overview
Problem
Existing display devices face issues with luminance deviation due to hysteresis characteristics of driving transistors, particularly when driving conditions change, leading to unpredictable image quality.
Innovation Solution
A display driving circuit that generates a bias voltage that varies with changes in driving conditions, using a bias voltage generator to control the hysteresis characteristic of transistors within pixels, adjusting the bias voltage based on driving frequency and reference voltages to minimize luminance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed bias voltage is used to control transistor hysteresis, then the circuit structure is simple, but luminance deviation occurs when driving conditions change
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed bias voltage to a dynamically adjusted bias voltage that responds to driving conditions. The bias voltage generator continuously monitors the driving voltage and adjusts the bias voltage accordingly, ensuring optimal transistor operation across varying conditions and eliminating luminance deviation while maintaining circuit functionality.
Solution Approach 2:
The patent implements feedback by introducing a bias voltage generator that monitors the driving voltage and adjusts the bias voltage in response to changes in driving conditions. This closed-loop feedback mechanism ensures that the bias voltage remains optimal for minimizing transistor hysteresis effects and maintaining uniform luminance across the display panel.
2Reliability
If the bias voltage is dynamically adjusted to control hysteresis, then luminance deviation is reduced, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the bias voltage generator to perform multiple functions: it generates the bias voltage, monitors the driving voltage, and adjusts the bias voltage in response to driving conditions. This multi-functional approach consolidates what would otherwise require separate components, reducing overall circuit complexity while achieving dynamic bias control for luminance uniformity.
3Ease of operation
If a constant driving voltage is applied, then the circuit operation is simple, but hysteresis characteristics cause unpredictable image quality
Solution Approach 1:
The patent applies dynamics by transitioning from constant voltage operation to dynamic voltage adjustment. The bias voltage generator continuously adapts the bias voltage in response to changes in driving voltage, ensuring predictable and consistent image quality across varying operating conditions while maintaining ease of circuit operation through automated control.
Data Source
AI summary
A display driving circuit includes a data driver that outputs a data signal to pixels, and a power supply that generates a driving voltage and a bias voltage. The driving voltage is provided to a first end of a transistor that generates a driving current based on the data signal provided to each of the pixels, and the bias voltage is provided at a second end of the transistor and varies based on a change in the driving voltage.