Electroluminescence Display Sub-frame Emission Control
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Solution Overview
Problem
Electro-luminescence display devices driven by the time divisional method consume excessive power due to a fixed full white brightness, regardless of the external environment's brightness.
Innovation Solution
An electro-luminescence display device and method that control full white brightness based on external environment brightness, using a timing controller to adjust the number of sub-frames and emission times, with a photo sensor detecting external brightness and converters modifying data voltages to optimize gray level expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the time divisional driving method is used to control gray levels, then the response speed is improved, but the power consumption increases due to fixed full white brightness
Solution Approach 1:
The patent applies dynamics by making the emission time of sub-frames adjustable rather than fixed. The timing controller dynamically changes the emission time duration based on ambient light conditions detected by a photosensor, allowing the display to adapt between high brightness mode (longer emission time) and low brightness mode (shorter emission time), thereby reducing power consumption in dim environments while maintaining fast response characteristics of EL displays
Solution Approach 2:
The patent changes the emission time parameter of sub-frames based on ambient light conditions. By detecting ambient brightness with a photosensor and adjusting the emission time parameter accordingly, the system optimizes power consumption while maintaining acceptable display performance. This parameter adjustment allows the same time divisional driving method to operate efficiently across different environmental conditions
2Illumination intensity
If the full white brightness is maintained at fixed level, then the display quality is improved, but the power consumption increases in dim environments
Solution Approach 1:
The system dynamically adjusts display brightness by modifying the emission time of sub-frames based on ambient light detection. In dim environments, the emission time is reduced which proportionally reduces power consumption while maintaining sufficient brightness through optimized timing control. This dynamic adjustment allows the display to adapt to ambient conditions rather than maintaining fixed high brightness
Solution Approach 2:
The patent maintains continuous useful action by ensuring that even in low brightness mode, the display continues to provide adequate illumination through optimized emission timing. The photosensor continuously monitors ambient light and the timing controller continuously adjusts emission durations, ensuring the display remains useful across all lighting conditions without complete shutdown
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
Reduces power consumption by dynamically adjusting sub-frame emission times and gray levels according to external brightness, allowing for high or low brightness modes without modifying driving times, thereby optimizing power usage.
Implementation Method 1
a photo sensor for detecting said brightness of the external environment of the display panel
Implementation Method 2
An electro-luminescence (EL) display is a self-luminous device in which a phosphorous material emits light by recombination of electrons and holes
Data Source
AI summary
An electro-luminescence display device and a method of driving the same for controlling a full white brightness depending upon a brightness of the external environment and thus controlling a brightness mode is disclosed. An electro-luminescence display device according to the present invention comprising: a display panel having pixels light-emitted by a supplied current; a data driver for applying a data voltage corresponding to said current to the pixels; and a timing controller for dividing one frame into a plurality of sub-frames and applying said data voltage corresponding to each of the plurality of sub-frames to the data driver and for controlling an emission time of each frame.