Foldable Terminal Display Luminance Control for Reflection Reduction

Solution Overview

Problem

In foldable terminal devices with two housings connected via a hinge, the visibility of display screens is reduced due to reflection when the opening angle is small, and existing solutions require complex management of extensive information for image quality correction.

Innovation Solution

A terminal device with an opening angle judgment mechanism and display control system that adjusts the luminance of the displays based on the opening angle, reducing reflection and improving visibility by controlling backlight luminance when the angle is below a predetermined threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If image quality correction is performed using conventional methods with extensive information management for each folding angle, then reflection prevention capability is improved, but device complexity and processing complexity increase significantly

Engineering Contradiction:

ImprovereflectionVSAvoidinformation management complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts only the essential parameter (opening angle) needed for reflection prevention, discarding the complex multi-dimensional information management approach of conventional methods. By using a single angle detection mechanism and corresponding luminance correction values, it simplifies the information structure while maintaining effective reflection control.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the approach from managing extensive fixed information for multiple angles to dynamically adjusting luminance based on the detected opening angle. The system stores correction values corresponding to different opening angles and applies the appropriate correction based on real-time angle detection, transforming a static information management problem into a dynamic parameter adjustment solution.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If image quality correction is performed based on enormous information for each folding angle, then reflection prevention is improved, but processing becomes complicated

Engineering Contradiction:

ImprovereflectionVSAvoidprocessing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts only the essential parameter (opening angle) needed for reflection prevention, discarding the complex multi-dimensional information management approach of conventional methods. By using a single angle detection mechanism and corresponding luminance correction values, it simplifies the information structure while maintaining effective reflection control.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the approach from managing extensive fixed information for multiple angles to dynamically adjusting luminance based on the detected opening angle. The system stores correction values corresponding to different opening angles and applies the appropriate correction based on real-time angle detection, transforming a static information management problem into a dynamic parameter adjustment solution.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If information stored and managed is limited to fixed information such as keypad information, then device complexity is reduced, but adaptability to different display content is limited

Engineering Contradiction:

Improveinformation management simplicityVSAvoiddisplay content adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal reflection prevention mechanism that works for any display content by detecting the opening angle and applying appropriate luminance correction. Unlike conventional methods that require separate fixed information for different elements (keypads, displays, etc.), this system provides a single unified solution that adapts to all display content automatically based on the detected angle.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8773326B2Terminal device and recording medium with control program recorded therein

Publication Date: 2014.07.08 NEC CORP

AI summary

In a terminal device, when an opening angle of two display section housings is detected by an opening angle detecting section 17, and the opening angle is smaller than a predetermined angle (such as 90°), a control section 11 controls luminance of at least one of display sections 4 and 5 included in the display section housings, based on the opening angle. In a case where the display sections 4 and 5 are display devices that use backlights 8 and 9, the control section 11 controls luminance of at least one of the backlights 8 and 9 illuminating the display sections 4 and 5.