Display Lighting Inspection Circuit With Shared Driving-Power Path
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Solution Overview
Problem
The efficiency of auto probe inspection circuits in display devices is low due to their exclusive use for inspection before shipment, occupying valuable non-display area and necessitating separate circuits for lighting inspection and module driving modes.
Innovation Solution
A lighting inspection circuit is integrated into the display device, allowing component sharing by connecting it in a compatible manner with the driving mode, enabling use in both lighting inspection and module driving modes, thereby reducing the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated lighting inspection circuit is provided in the non-display area, then lighting inspection can be performed, but the occupied area increases and use efficiency decreases
Solution Approach 1:
The patent makes the mode signal input pad and associated circuitry serve dual purposes: receiving lighting inspection signals during inspection mode and receiving driving power signals during module driving mode. This multi-functionality eliminates the need for separate dedicated circuits, thereby reducing the non-display area while maintaining lighting inspection capability
Solution Approach 2:
The patent merges the lighting inspection circuit with the module driving circuit by using shared components including the mode signal input pad, switching elements, and power supply lines. This consolidation combines previously separate functions into a unified circuit structure, reducing overall circuit area in the non-display region
2Adaptability or versatility
If separate circuits are provided for lighting inspection and module driving modes, then each mode can be optimized, but device complexity increases
Solution Approach 1:
The patent introduces a mode signal input pad that can dynamically switch between receiving lighting inspection signals and driving power signals based on the operating mode. This dynamic adaptability allows a single circuit structure to serve multiple functions without requiring separate dedicated circuits for each mode
Solution Approach 2:
The switching elements and power supply lines are designed to universally handle both lighting inspection signals and driving power signals. This universal design maintains mode-specific optimization capabilities while reducing circuit complexity through component sharing
Data Source
AI summary
A lighting inspection circuit and a display device including the same are disclosed. A light inspection circuit may include: a mode signal input pad receiving a lighting inspection signal or driving power according to a driving mode of a display device; a lighting inspection switching element transferring the lighting inspection signal to a plurality of lighting inspection lines connected to a plurality of subpixels of the display device when turned on according to the driving mode; and a power supply switching element connected to one end of the lighting inspection switching element and, when turned on according to the driving mode, transferring the driving power applied to the mode signal input pad to a plurality of power supply lines connected to the plurality of subpixels.