Electroluminescent Display Peak Brightness Control
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Solution Overview
Problem
Conventional Peak Luminance Control (PLC) driving technologies for electroluminescence display devices face limitations in reducing power consumption and effectively setting target peak brightness for each Average Picture Level (APL) due to fixed high-potential pixel voltage or fixed maximum data adjustments.
Innovation Solution
An electroluminescence display device with a memory and timing controller that adjusts both high-potential pixel voltage and maximum data independently for each APL section, using predefined reference profiles to modulate image data and voltage levels based on image analysis, allowing for stepwise reduction in peak brightness as APL increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If only maximum data of each image is gradually adjusted based on the PLC curve while high-potential pixel voltage is fixed, then peak brightness can be controlled, but power consumption reduction is limited
Solution Approach 1:
The patent applies parameter changes by simultaneously adjusting two critical parameters: the high-potential pixel voltage (ELVDD) and the maximum image data values. By dynamically modifying both voltage and data parameters based on APL sections, the system achieves more effective peak brightness control and power consumption reduction compared to adjusting only one parameter.
Solution Approach 2:
The patent segments the APL range into multiple sections (first APL section, second APL section, etc.) with different threshold values. Each section has independently defined EVDD adjusting levels and Max data adjusting values, allowing differentiated control strategies for different brightness conditions, thereby optimizing both image quality and power efficiency.
2Illumination intensity
If only high-potential pixel voltage is gradually adjusted based on the PLC curve while maximum data of each image is fixed, then peak brightness can be controlled, but difficulty in setting target peak brightness for each APL according to the PLC curve arises
Solution Approach 1:
The patent enables flexible target peak brightness setting by independently adjusting both the voltage parameter (ELVDD) and data parameter (Max data) for each APL section. This dual-parameter adjustment provides fine-grained control over peak brightness, making it easier to match specific PLC curve requirements compared to single-parameter adjustment methods.
Solution Approach 2:
The patent implements dynamic adjustment where both EVDD levels and Max data values are changed based on the current APL section. This dynamic, adaptive approach allows the system to respond flexibly to different image content and PLC curve requirements, improving ease of operation for peak brightness control.
3Use of energy by moving object
If both high-potential pixel voltage and maximum data are adjusted independently for each APL section, then power consumption is significantly reduced and target peak brightness is precisely matched, but device complexity increases
Solution Approach 1:
The patent divides the control system into segmented APL sections with predefined threshold values. Each section has predetermined EVDD adjusting levels and Max data adjusting values stored in memory, which simplifies the control logic by using lookup tables rather than complex real-time calculations, thereby managing device complexity while achieving effective power reduction.
Solution Approach 2:
The patent performs preliminary action by pre-defining EVDD reference profiles and MDATA reference profiles with adjusting levels and values for each APL section before operation. This preprocessing approach stores control parameters in advance, reducing the computational burden during real-time operation and managing system complexity while maintaining effective dual-parameter control.
Data Source
AI summary
An electroluminescence display device lowers peak brightness of a screen image based on a preset peak luminance control (PLC) curve as an average picture level (APL) of the image is increased. The electroluminescence display device includes a memory and a timing controller. The memory stores an ELVDD reference profile for defining EVDD adjusting levels for adjusting a high-potential pixel voltage applied to pixels of the screen image in units of 1 image frame and an MDATA reference profile for defining Max data adjusting values for adjusting image data applied to the pixels of the screen image in the units of 1 image frame, for matching target peak brightness for each preset APL section with the PLC curve. The timing controller calculates an EVDD adjusting value and a Max data adjusting value of a first image frame based on an analysis result of image data of the first image frame and information stored in the memory and modulates image data of the first image frame based on the Max data adjusting value.