Functional Safety Display Controller Hardware Error Detection

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Solution Overview

Problem

Existing functional safety display control systems face challenges in balancing research and development costs, risk control, and system area overhead while meeting ISO26262 standards, with traditional systems requiring extensive software and hardware updates and increased complexity.

Innovation Solution

A functional safety display controller with integrated functional safety detection units within various modules to detect random and permanent errors in hardware circuits, reducing the need for software certification and optimizing development cycles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional functional safety display control systems use software and hardware test sequences to meet ISO26262 standards, then functional safety detection capability is improved, but device complexity and development cycle increase significantly

Engineering Contradiction:

Improvefunctional safety detection capabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the functional safety detection capability from complex software-test sequences and implements it through dedicated hardware detection circuits integrated into the display controller. This extraction allows the system to meet ISO26262 standards through hardware-level detection rather than complex software testing, thereby reducing overall system complexity while maintaining safety detection capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary functional safety detection module that sits between the display controller and the external interface. This intermediary module handles all safety detection functions, isolating the complexity of safety compliance from the main display control logic and reducing the complexity burden on the overall system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If software test sequences are used for functional safety detection, then detection capability is improved, but development time and cost increase by 6-8 times

Engineering Contradiction:

Improvefunctional safety detection capabilityVSAvoiddevelopment cycle

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by pre-configuring hardware detection circuits that are inherently capable of performing safety checks. These circuits are built into the display controller architecture from the ground up, eliminating the need for time-consuming software test sequence development and certification processes that would otherwise extend the development cycle by 6-8 times.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If hardware replication and comparison circuits are used to detect random errors, then functional safety detection is improved, but area overhead increases by 2-2.5 times

Engineering Contradiction:

Improverandom error detection capabilityVSAvoidchip area overhead

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the functional safety detection circuits with the existing display controller architecture. By integrating safety detection functions into the same hardware structure that already exists for display control, the patent achieves random error detection capability without requiring separate, additional hardware blocks that would increase area overhead by 2-2.5 times.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements multi-functionality by designing hardware circuits that serve dual purposes: normal display control operations and functional safety detection. This universality allows the same hardware resources to perform both display functions and safety monitoring, thereby achieving error detection capability without proportionally increasing chip area.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If extensive software updates are implemented to meet functional safety standards, then compliance capability is improved, but ease of manufacture deteriorates

Engineering Contradiction:

ImproveISO26262 compliance capabilityVSAvoidmanufacturing simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies mechanics substitution by replacing software-based safety compliance mechanisms with hardware-based detection circuits. This substitution eliminates the need for extensive software updates and certifications, thereby improving ease of manufacture while maintaining ISO26262 compliance capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250315335A1Functional safety display controller and functional safety display control system

Publication Date: 2025.10.09 VERISILICON MICROELECTRONICS (SHANGHAI) CO LTD

AI summary

A functional safety display controller and a functional safety display control system are provided in the present disclosure. The functional safety display controller is connected to a central controller, a memory, and a display through communication lines, at least one internal module of the functional safety display controller is provided with a functional safety detection unit, and the functional safety detection unit is configured to detect random errors that occur in a corresponding module. The functional safety display controller, the central controller, the memory, and the display form the functional safety display control system, which can balance issues such as research and development costs, risk control, and system area overhead.