Display Device Reference Voltage Supply System
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Solution Overview
Problem
High-definition display devices face challenges in maintaining uniformity and luminance across divided display areas due to potential differences in reference voltages used for gradation voltage generation, leading to non-uniform display and potential errors in signal line drivers.
Innovation Solution
The implementation of a reference voltage supply system where a master board provides a reference voltage to all circuit boards, ensuring synchronized gradation voltage generation across divided display areas, using switching circuits and diodes to manage voltage drops and maintain consistent gradation voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a divisional drive system is used to handle high-definition display, then the write time for each pixel is sufficient, but potential differences in reference voltages cause luminance differences and non-uniformity between divided display areas
Solution Approach 1:
The patent applies equipotentiality by connecting all circuit boards through connection lines to establish a common reference voltage potential. The master board generates a reference voltage that is distributed to all slave boards, ensuring that all gradation voltage generation circuits operate from the same reference potential, thereby eliminating luminance differences and non-uniformity between divided display areas.
Solution Approach 2:
The patent merges the reference voltage generation function into a single master board while distributing the gradation voltage generation across multiple slave boards. This consolidation ensures that all divided display areas use a unified reference voltage source, resolving the contradiction between sufficient write time and display uniformity.
2Adaptability or versatility
If separate power supply circuits are provided on each circuit board, then each board can operate independently, but voltage drops cause shifts in gradation voltages and display non-uniformity
Solution Approach 1:
The patent introduces connection lines as intermediaries that transmit the reference voltage from the master board to all slave boards. These connection lines serve as mediators that equalize the reference voltage potential across all circuit boards, preventing gradation voltage shifts caused by independent power supply variations while maintaining independent operation capability.
3Ease of operation
If reference voltages are generated locally on each circuit board, then each board operates autonomously, but potential differences cause luminance differences between divided areas
Solution Approach 1:
The patent establishes equipotentiality for reference voltages by having all circuit boards receive their reference voltage from the master board through connection lines. This ensures that despite autonomous operation of each board, all gradation voltage generation circuits operate at the same reference potential, eliminating luminance differences between divided display areas.
Data Source
AI summary
According to one embodiment, a display device, includes a display panel which includes divided display areas, signal line drivers, circuit boards which include a master board, power supply circuits, gradation voltage generation circuits, and at least one connection line, all the gradation voltage generation circuits generating the gradation voltages corresponding to a reference voltage supplied from the power supply circuit provided on the master board.