Backlight Sensor Dynamic Measurement Time Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in accurately adjusting backlight brightness to user-desired levels due to variations in LED color and light quantity, leading to extended time in achieving the desired brightness, especially at low brightness settings, as current digital color sensors require longer measurement times to maintain accuracy.
Innovation Solution
A sensor device with a light sensor that acquires a light quantity measurement value proportional to the backlight's light quantity and measurement time, including a light quantity target value calculating unit and a measurement time calculating unit to adjust measurement time based on the acquired values, ensuring accurate feedback control and reducing the time to achieve the desired brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement time is extended to maintain measurement accuracy at low brightness, then the measurement precision is improved, but the time required to adjust backlight brightness increases
Solution Approach 1:
The patent applies dynamics by making the measurement time variable rather than fixed. The measurement time calculating unit dynamically adjusts the measurement time based on the target brightness value, using shorter measurement times for high brightness and longer measurement times for low brightness. This resolves the contradiction by adapting the measurement duration to the specific operating conditions, achieving sufficient accuracy without unnecessary time delays.
Solution Approach 2:
The patent changes the parameter of measurement time based on the target brightness level. By calculating and adjusting the measurement time as a variable parameter rather than using a constant value, the system optimizes the balance between measurement accuracy and response time. This parameter change allows the system to maintain adequate measurement precision while minimizing the time required to achieve the desired brightness adjustment.
2Measurement precision
If a fixed long measurement time is used to ensure accuracy across all brightness levels, then the measurement precision is improved, but the productivity of brightness adjustment is reduced
Solution Approach 1:
The system transitions from a static fixed measurement time to a dynamic adaptive measurement time. The measurement time calculating unit continuously adjusts the measurement duration based on the target brightness, enabling faster brightness adjustments for high brightness levels while maintaining adequate measurement time for low brightness levels. This dynamic approach resolves the contradiction between measurement precision and productivity.
Solution Approach 2:
The patent applies partial action by using only the necessary measurement time for each specific brightness level rather than consistently using an excessively long measurement time for all cases. For high brightness levels where shorter measurement times suffice, the system uses partial measurement duration, thereby improving productivity without compromising the required measurement precision for each condition.
3Productivity
If the measurement time is shortened to improve brightness adjustment speed, then the productivity is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent changes the measurement time parameter adaptively based on the target brightness level rather than using a fixed short measurement time. The measurement time calculating unit computes the appropriate measurement duration for each brightness level, ensuring sufficient measurement precision is maintained while optimizing the brightness adjustment speed. This parameter change resolves the contradiction by preventing measurement time from being uniformly short across all conditions.
Solution Approach 2:
The system implements dynamics by making the measurement time flexible and adaptive rather than fixed and static. The measurement time calculating unit dynamically determines the appropriate measurement duration based on real-time target brightness values, allowing the system to achieve fast brightness adjustment when appropriate while maintaining measurement precision when required. This dynamic adaptation resolves the contradiction between productivity and measurement precision.
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 proposed solution reduces the time required to adjust backlight brightness to the user's desired level by optimizing measurement time, maintaining accuracy while minimizing the impact of LED variations and sensor sensitivity changes, thus improving the efficiency and responsiveness of the liquid crystal display device.
Implementation Method 1
a light sensor (color sensor) that can measure a light quantity for each color component (R, G, and B) included in received light
Data Source
AI summary
A sensor device includes: a light sensor that acquires a first light quantity measurement value that is proportional to a light quantity of a backlight and a first measurement time; a light quantity target value calculating unit that calculates a light quantity target value based on a user setting for the backlight; and a measurement time calculating unit that calculates a second measurement time for when the light sensor acquires a second light quantity measurement value a next time, based on the acquired first light quantity measurement value and the light quantity target value.