TV Front Panel Keyboard Logic Detection With a Universal Controller

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Solution Overview

Problem

Existing television receivers require separate controllers for keyboards with negative and positive operational logic, increasing costs due to the need for different types of front panel keyboards.

Innovation Solution

A television controller that detects the operational logic of the front panel keyboard and applies the necessary keyboard operational voltage, using a shared light control line to determine if the logic is positive or negative, thereby eliminating the need for separate controllers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate controllers are used for negative and positive operational logic keyboards, then key activation signal detection accuracy is improved, but device complexity and cost increase

Engineering Contradiction:

Improvekey activation signal detection accuracyVSAvoidcontroller type variety

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The controller is designed with universal functionality to support both negative and positive operational logic keyboards through a single device. The controller includes an identification voltage detection circuit that automatically detects the keyboard type and adjusts its operation accordingly, eliminating the need for separate controllers for different keyboard types while maintaining accurate key activation signal detection for both logic types

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If a single controller is used for both negative and positive operational logic keyboards, then device complexity is reduced, but the ability to accurately detect key activation signals deteriorates

Engineering Contradiction:

Improvecontroller type varietyVSAvoidkey activation signal detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The controller employs dynamic adaptation by automatically detecting the operational logic type through identification voltage detection and adjusting its signal detection methodology in real-time. For negative logic keyboards, the controller detects active-low signals, while for positive logic keyboards, it detects active-high signals, thereby maintaining accurate key activation signal detection across different keyboard types with a single static hardware design

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The controller uses feedback from the identification voltage detection circuit to determine the keyboard type and configure its signal detection parameters accordingly. The detection circuit monitors the presence or absence of identification voltage on the keyboard sense lines and uses this feedback information to switch between different detection modes, ensuring accurate key activation signal detection for both negative and positive logic keyboards

Inventive Principle:

Principle #23Feedback

3Measurement precision

If different controllers are designed for different keyboard types, then key activation signal detection accuracy is improved, but manufacturing cost increases

Engineering Contradiction:

Improvekey activation signal detection accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Ease of manufacture

If a single controller supports both keyboard types, then manufacturing cost is reduced, but the difficulty of detecting keyboard type increases

Engineering Contradiction:

Improvemanufacturing costVSAvoidkeyboard type detection

Core Design Contradiction:

Ease of manufactureVSDifficulty of detecting and measuring

Solution Approach 1:

The controller performs preliminary detection of the keyboard type by checking for the presence or absence of identification voltage on the keyboard sense lines during the initialization phase. This preliminary action allows the controller to configure its detection parameters before actual key activation signals are processed, simplifying the overall detection process and reducing the difficulty of keyboard type identification

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7679680B2Apparatus in a TV receiver for automatically detecting the type of keyboard attached thereto

Publication Date: 2010.03.16 INTERDIGITAL MADISON PATENT HLDG

AI summary

A television apparatus includes a front panel keyboard having first and second keys, and a controller for detecting a type of operational logic of the front panel keyboard. The controller applies a keyboard operational voltage to the front panel keyboard according to the detected type of operational logic. If the controller determines that the type of operational logic is negative, the controller applies the keyboard operational voltage to the front panel keyboard. Otherwise, if the controller determines that the type of operational logic is positive, the controller applies no keyboard operational voltage to the front panel keyboard.