Liquid Crystal Device Multi-Sensor Light Detection

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Solution Overview

Problem

Existing liquid crystal devices face a decrease in photo sensor resolution as ambient light intensity increases, limiting the precision and range of backlight intensity adjustment.

Innovation Solution

Incorporating multiple light receivers with varying sensitivities and light-receiving surface areas, allowing for precise ambient light intensity detection by selecting the most appropriate sensitivity for each condition, and using a controller to adjust the illuminating light accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single photo sensor is used to measure ambient light intensity, then the device structure remains simple, but the resolution decreases and detection range is limited as ambient light intensity increases

Engineering Contradiction:

Improvephoto sensor resolutionVSAvoidphoto sensor configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the single photo sensor into multiple photo sensors (first photo sensor and second photo sensor) with different light-receiving surface areas. This segmentation allows each sensor to operate in optimal response time ranges for different ambient light conditions, maintaining high resolution across the entire detection range without increasing overall system complexity significantly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension of differentiation by varying the light-receiving surface areas of the photo sensors. This dimensional change creates sensors with inherently different sensitivities, enabling the system to detect ambient light intensity across a broader range while maintaining high resolution, as each sensor's response time characteristics complement the others.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If the light-receiving surface area is increased to improve sensitivity, then detection capability in low light improves, but response time decreases excessively in high light conditions

Engineering Contradiction:

Improvedetection sensitivityVSAvoidresponse time

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent applies local quality by creating photo sensors with different light-receiving surface areas tailored to specific detection needs. The first photo sensor has a smaller area optimized for high light conditions with faster response, while the second has a larger area optimized for low light conditions with higher sensitivity, allowing each sensor to excel in its designated operational regime.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the physical parameter of light-receiving surface area to create a family of photo sensors with different sensitivity characteristics. This parameter variation enables the system to maintain appropriate response times across different ambient light intensities by selecting the sensor whose surface area matches the current lighting conditions.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple photo sensors with different sensitivities are used, then detection range and resolution are improved, but device complexity increases

Engineering Contradiction:

Improvedetection rangeVSAvoidcontroller logic

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements feedback by having the controller continuously monitor the response times from multiple photo sensors and automatically select the most appropriate sensor based on current ambient light conditions. This feedback mechanism allows the system to adapt to changing light levels dynamically, expanding the effective detection range while keeping the controller logic relatively simple through rule-based selection.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent creates a universal light detection system where multiple photo sensors with different characteristics work together under a single controller. The controller serves multiple functions by selecting appropriate sensors based on conditions, processing data from various sensors, and maintaining consistent output across the entire detection range, thereby managing complexity through multi-functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration enhances the resolution and detection range of ambient light intensity, optimizing display states and reducing power consumption while maintaining accurate light adjustment.

Implementation Method 1

measuring a response time, which is the time taken from irradiation of the light-receiving surface with the ambient light to the output of an electronic signal produced by a photoelectric conversion

Methodology Applied

Scientific EffectPhotoelectric conversion: Photoelectric Effect

Data Source

PatentUS7777736B2Liquid crystal device, light-emitting device, and electronic apparatus

Publication Date: 2010.08.17 MAGNOLIA WHITE CORP

AI summary

A liquid crystal device includes a liquid crystal panel having a pair of substrates with a liquid crystal layer interposed therebetween, a plurality of light receivers that receives an ambient light and obtains an intensity information of the ambient light, and a controller that controls a display state of an image to be displayed on the liquid crystal panel. In the liquid crystal device, in at least one of the plurality of light receivers, sensitivity for the ambient light differs from the sensitivity of the other light receiver.