Display Luminance Control via Driving Current Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display luminance control methods using automatic current limitation (ACL) require complex circuit configurations and re-generation of video data, leading to delayed and discontinuous luminance adjustments, especially as screen resolution increases.
Innovation Solution
A simplified ACL circuit that calculates average luminance and adjusts driving current to light-emitting diodes, eliminating the need for re-generating video data by using an average luminance calculation unit, luminance variation calculation unit, and driving current control unit to gradually control luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If video data is re-generated for luminance control, then luminance adjustment is achieved, but circuit configuration becomes complicated and screen delay occurs
Solution Approach 1:
Instead of modifying video data to control luminance (conventional approach), the patent inverts the approach by controlling the driving current directly to the pixel circuit. This eliminates the need for complex video data regeneration while achieving the same luminance control effect, thereby simplifying the circuit configuration.
Solution Approach 2:
The patent extracts the luminance control function from the video data processing path and places it in the driving current path. By separating the luminance control function from video data regeneration, the circuit complexity is reduced while maintaining effective luminance adjustment capability.
2Illumination intensity
If video data is re-generated for luminance control, then luminance adjustment is achieved, but screen delay occurs
Solution Approach 1:
The patent performs luminance control by adjusting driving current in advance, before the pixel circuit needs to be updated. This preliminary current adjustment eliminates the time-consuming video data regeneration process, thereby reducing screen delay while achieving timely luminance adjustment.
Solution Approach 2:
The patent replaces the mechanical/video data processing system with an electrical current control system. By substituting video data regeneration with direct electrical current adjustment, the time-consuming data processing step is eliminated, resulting in faster response and reduced screen delay.
3Illumination intensity
If video data is re-generated and immediately applied, then luminance control is achieved, but luminance change appears discontinuous to viewers
Solution Approach 1:
The patent implements dynamic luminance control by gradually adjusting the driving current rather than applying immediate changes. This dynamic adjustment allows the luminance to transition smoothly over time, making the change imperceptible to viewers and eliminating the discontinuous appearance problem.
Solution Approach 2:
The patent employs periodic or gradual current adjustment instead of immediate application. By distributing the luminance change over multiple periods or frames through controlled current variation, the transition becomes smooth and continuous, improving viewer perception.
4Loss of energy
If ACL is applied to reduce power consumption, then power consumption decreases, but circuit configuration becomes complicated
Solution Approach 1:
The patent merges the ACL (automatic current limitation) function with the existing driving current control path. By combining luminance control and power management functions into a single current control mechanism, the patent achieves power consumption reduction without adding separate complex circuitry for ACL.
Solution Approach 2:
The driving current control unit is designed to serve multiple functions: it controls luminance adjustment and simultaneously implements ACL for power consumption reduction. This multi-functionality eliminates the need for separate dedicated ACL circuits, thereby reducing overall circuit complexity while achieving power savings.
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 simplifies the ACL circuit, reduces power consumption, and allows for natural and gradual luminance adjustments, improving productivity and viewer experience by avoiding discontinuous screen changes.
Implementation Method 1
a light-emitting diode, and a pixel driving circuit which applies a driving current to the light-emitting diode
Data Source
AI summary
Provided is a device for controlling luminance of a display, having a simplified ACL circuit compared to the prior art. The device for controlling luminance of a display calculates the average luminance (Y_avg) when video data is input, and determines the luminance variation (ΔY) according to the average luminance. The device for controlling luminance of a display may adjust the luminance of a display by controlling a current (driving current) that is used to drive a light-emitting diode included in a pixel, instead of modifying video data for the adjustment of luminance. That is, unlike the prior art, the device for controlling luminance of a display does not modify video data, for the control of luminance.