Backlight Device Brightness Controller Pad Unit LED Uniformity
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Solution Overview
Problem
Existing backlight devices using light-emitting diodes (LEDs) face challenges in maintaining uniform brightness and color across the entire display area, and require improved instantaneous current control to enhance lifespan and performance.
Innovation Solution
A backlight device with a substrate featuring a plurality of light emitters, each including a brightness controller and a pad unit, where a thin-film transistor generates a light-emission current, and a light-emitting diode is connected to the pad unit to emit light based on this current, ensuring uniformity and compensation for threshold voltage deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a light-emitting diode (LED) is used as a light source for backlight unit, then power consumption is reduced and environmental friendliness is improved, but uniformity of brightness and colors on the whole area of display apparatus deteriorates
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light emission regions, each with its own dimming control circuit. This segmentation allows individual adjustment of each region's brightness to compensate for LED aging and threshold voltage deviations, maintaining overall uniformity while using energy-efficient LEDs
Solution Approach 2:
The patent implements dynamic adjustment of driving voltages and currents for each LED region based on sensed threshold voltage deviations and aging characteristics. By changing electrical parameters (voltage, current) in response to measured conditions, the system compensates for non-uniformity while maintaining LED power consumption advantages
2Device complexity
If conventional LED backlight structure is used, then device complexity is reduced, but instantaneous current control capability deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms where threshold voltages of LEDs are sensed and used to adjust driving voltages in real-time. This feedback loop enables precise instantaneous current control for each light emission region, improving response capability while maintaining relatively simple overall device structure
Solution Approach 2:
The system dynamically adjusts driving parameters based on real-time sensing of LED characteristics and ambient conditions. This dynamic control capability allows the backlight to respond instantly to changing requirements while keeping the physical structure simple and manageable
3Device complexity
If LED aging is not compensated, then device complexity is reduced, but brightness uniformity and life span deteriorate
Solution Approach 1:
The patent performs preliminary characterization of each LED's threshold voltage and aging characteristics during manufacturing or initial operation. This preliminary data is stored and used to pre-adjust driving parameters, proactively compensating for expected aging effects before they significantly impact performance, thereby extending operational life
Solution Approach 2:
Continuous or periodic sensing of LED threshold voltages provides feedback on aging status. The system uses this feedback to progressively adjust driving parameters, compensating for degradation over time and maintaining uniform brightness throughout the LED's extended operational life
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
The solution achieves improved brightness uniformity and extended lifespan of the backlight device by effectively controlling light emission and compensating for threshold voltage deviations, thereby enhancing display quality and reliability.
Implementation Method 1
a light-emitting diode is allowed to be disposed on the pad unit, and the light-emitting diode emits light based on the light-emission current
Data Source
AI summary
A backlight device includes a substrate and a plurality of light emitters on the substrate. Each of the plurality of light emitters includes a brightness controller disposed on the substrate, and a pad unit disposed on the substrate. The brightness controller generates a light-emission current, a light-emitting diode is allowed to be disposed on the pad unit, and the light-emitting diode emits light based on the light-emission current.