Display Pixel Driving With Grayscale-Segmented Emission Control
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Solution Overview
Problem
Display devices face challenges in maintaining high light efficiency across all grayscale levels, leading to potential image stains and reduced display quality due to varying light efficiency characteristics of light emitting elements, especially in low grayscale sections.
Innovation Solution
A display device with a driver system that varies the voltage level of the data signal in one grayscale section and the duty ratio of the duty control signal in another, while maintaining a constant voltage level in a third section, to optimize light emission duty and efficiency across different grayscale levels, using inorganic light emitting diodes and transistors to control emission time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting unit operates at low grayscale levels, then the luminance output decreases, but the light efficiency decreases significantly causing image stains
Solution Approach 1:
The patent applies dynamics by making the driving method adaptive based on grayscale levels. The driver transistor switches between two operating modes: PWM mode for low grayscales and voltage control mode for high grayscales. This dynamic adaptation allows the system to maintain optimal light efficiency across the entire grayscale range while preventing image stains in low grayscale regions.
Solution Approach 2:
The patent changes the operating parameters of the light emitting unit based on grayscale levels. By adjusting the duty ratio of the PWM signal at low grayscales and switching to direct voltage control at high grayscales, the system optimizes the operating point of the light emitting unit to maintain high light efficiency across all luminance levels.
2Device complexity
If a single driving method is used for all grayscale levels, then the device complexity is reduced, but the display quality deteriorates due to light efficiency variations
Solution Approach 1:
The patent segments the grayscale range into two sections: a first grayscale section (lower grayscales) and a second grayscale section (higher grayscales). Each section uses a different driving method optimized for its specific range. This segmentation allows the system to maintain high display quality across all grayscales without requiring an overly complex unified driving circuit.
Solution Approach 2:
The light emitting unit is designed to support multiple operating modes through its dual-connection structure. The same light emitting unit can be driven by either PWM control or direct voltage control depending on the grayscale level, making it a multi-functional component that adapts to different operating conditions without requiring separate hardware for each mode.
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
This approach maintains high light efficiency uniformly across all grayscale levels, preventing image stains and enhancing display quality by adjusting emission duty and time based on grayscale values, thereby improving overall image clarity and reducing light efficiency-related deviations.
Implementation Method 1
a pixel emitting light of a luminance corresponding to a duty of the duty control signal and the data signal
Implementation Method 2
the at least one light emitting element may be an inorganic light emitting diode
Data Source
AI summary
A display device includes a display panel and the display panel includes a pixel. The pixel includes a light emitting unit including at least one light emitting element, a driving transistor providing a driving current corresponding to a data signal to the light emitting unit, and a first transistor electrically connected between both ends of the light emitting unit. A driver provides the data signal to the pixel and provides a duty control signal to the first transistor. The driver varies a voltage level of the data signal in a first grayscale section in which a grayscale corresponding to the data signal is greater than or equal to a reference grayscale, and varies a duty ratio of the duty control signal in a second grayscale section in which the grayscale is less than the reference grayscale.