OLED Brightness Control via Gamma Voltage Normalization
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Solution Overview
Problem
The difference in brightness controlling systems between OLED display devices and liquid crystal display devices poses a challenge for their common use in computer systems, such as notebook computers, as OLED devices are self-emitting while liquid crystal devices require an additional light source.
Innovation Solution
A brightness control device and method that includes a PWM controller, a selector, a normalizer, a peak brightness value detector, a multiplier, a maximum gamma voltage adjuster, and a reference gamma voltage generator, which convert and normalize external brightness control information into PWM signals or data communication protocols to adjust R/G/B maximum gamma voltage values, enabling synchronized brightness control across both display types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED display device uses self-emitting system, then brightness control is achieved through current intensity modulation, but compatibility with liquid crystal display brightness control systems is poor
Solution Approach 1:
The patent implements a dual-mode brightness control system that can operate in either PWM mode or gamma voltage mode. The controller includes a mode selection unit that determines which control method to use based on external control information, allowing the OLED display to be compatible with both types of brightness control systems used in liquid crystal displays.
Solution Approach 2:
The patent changes the control parameter from current intensity modulation (traditional OLED method) to gamma voltage modulation. By adjusting gamma voltages applied to the data driver, the system can control OLED brightness in a manner compatible with liquid crystal display brightness control systems, while maintaining the ability to use PWM mode when needed.
2Adaptability or versatility
If OLED display device controls brightness through current intensity, then brightness adjustment is achieved, but common use with liquid crystal display devices in computer systems is difficult
Solution Approach 1:
The patent introduces gamma voltages as an intermediary control mechanism. Instead of directly controlling current intensity, the system uses gamma voltages to modulate the data signal that controls OLED brightness. This intermediary approach allows compatibility with liquid crystal display brightness control systems while maintaining effective OLED brightness control.
Solution Approach 2:
The patent implements dynamic mode switching capability where the brightness control method can change based on external conditions. The controller dynamically selects between PWM mode and gamma voltage mode based on the type of brightness control information received, enabling flexible adaptation to different computer system configurations.
3Illumination intensity
If OLED display device uses traditional brightness control, then self-emitting characteristics are maintained, but unified brightness control with liquid crystal display is not achieved
Solution Approach 1:
The brightness control device is designed with multi-functionality to handle both PWM signals and gamma voltage signals. It includes a mode selection unit, a normalizer for converting control information to standard gain values, and a controller that can operate in either mode, achieving unified brightness control while maintaining self-emitting OLED characteristics.
Solution Approach 2:
The patent combines multiple control mechanisms (PWM control and gamma voltage control) into a unified brightness control system. The controller integrates both control methods and selects the appropriate one based on external input, creating a composite control system that achieves unified brightness control across different display types.
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 unified brightness control for both OLED and liquid crystal display devices, allowing them to be used in common computer systems by normalizing and adjusting gamma voltage values based on peak brightness and optical compensation, thereby optimizing display performance and power consumption.
Implementation Method 1
The OLED display device is a self light emitting device which emits a light as an electron and a hole of an organic light emitting layer therein re-couples
Data Source
AI summary
A device and a method for controlling brightness of an OLED display device are disclosed.The method for controlling brightness of an OLED display device includes the steps of forwarding external brightness control information in a PWM signal or a brightness control data, selecting and normalizing either the PWM signal or the brightness control data into an external brightness adjusting gain, analyzing a received video data to detect a peak brightness value, multiplying the peak brightness value by the external brightness adjusting gain to produce a final peak brightness value, adjusting the R/G/B maximum gamma voltage values according to the final peak brightness value, and generating R/G/B reference gamma voltage sets by using the R/G/B maximum gamma voltage values adjusted thus.