Scan Driver Activation Level Control for High Luminance
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Solution Overview
Problem
Display devices are limited by gamma settings to a maximum luminance, which restricts their ability to output light beyond this threshold, failing to accommodate scenarios requiring higher luminance, such as photo therapy modes.
Innovation Solution
A display device and method that control the activation level of a scan signal to increase the emission current, allowing the display to output light with a luminance higher than the maximum determined by gamma settings by adjusting the difference between the activation and deactivation levels of the scan signal, particularly when switching between normal and photo therapy modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma correction is performed to ensure even luminance perception, then luminance correlation accuracy is improved, but maximum output luminance is limited
Solution Approach 1:
The patent applies dynamics by making the scan signal activation level adjustable rather than fixed. The scan driver can dynamically change the activation level of the scan signal to control the emission current, allowing the display to output luminance higher than the gamma-determined maximum when needed, while maintaining accurate gamma correction under normal operating conditions.
2Illumination intensity
If the scan signal activation level is increased to boost emission current, then output luminance is improved, but control precision over emission current is reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the activation level of the scan signal as a controllable parameter. By changing this parameter, the system can modify the emission current to achieve higher luminance output when required, while maintaining precise control through the scan driver's ability to regulate the activation level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the display device to emit light with a luminance exceeding the gamma-determined maximum, effectively supporting higher luminance requirements in photo therapy modes by controlling the scan signal's activation level, thereby enhancing its operational flexibility.
Implementation Method 1
The storage capacitor stores electric charge based on the data signal
Implementation Method 2
The emitting element emits light based on the emission current
Data Source
AI summary
A display device and method of driving the display device are disclosed. In one aspect, the display device includes a display panel including a plurality of pixels and a scan driver configured to apply a scan signal having activation and deactivation levels to the pixels. Each of the pixels includes a storage capacitor, a switching transistor, a driving transistor and an emitting element configured to emit light based on an emission current received from the driving transistor. The scan driver is configured to selectively control the activation level of the scan signal so as to control the amount of charge stored in the storage capacitor. The driving transistor is configured to control the emission current based on the amount of charge stored in the storage capacitor.