AMOLED Source Driving Circuit Integration for Cost Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high processing cost of AMOLED display panels due to the integration of multiple circuit modules, including a pixel display array, gate driving circuit, and source driving circuit, which requires complex and costly technology processes.
Innovation Solution
Integration of the pixel display array, gate driving circuit, and source driving circuit on the same chip substrate, with the source driving circuit coupled to a panel control circuit external to the chip substrate, allowing for a medium voltage process that reduces technological complexity and cost, and using a ramp DAC and data strobe circuit for efficient digital-to-analog conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple circuit modules (pixel display array, gate driving circuit, source driving circuit) are integrated on the same chip substrate, then the processing cost and technological complexity increase, but the display resolution and uniformity are improved
Solution Approach 1:
The patent segments the source driving circuit into multiple independent ramp DAC modules, where each ramp DAC corresponds to a specific column of pixel circuits. This segmentation allows each DAC to be independently controlled and calibrated, improving display uniformity across different columns while managing the complexity through modular design. The gate driving circuit is also segmented into multiple scan signal output units that can be independently controlled.
Solution Approach 2:
The patent implements multi-functionality by designing the ramp DAC to serve multiple purposes: it generates data voltages for pixel circuits, provides calibration signals for uniformity adjustment, and can be controlled through a unified control interface. The control circuit can selectively activate different ramp DACs based on the display region being updated, allowing the same hardware to serve different functions at different times.
2Measurement precision
If multiple ramp DACs are added to increase display resolution, then the processing cost and device complexity increase, but the display precision is improved
Solution Approach 1:
The patent implements dynamic control of ramp DACs based on the display content and region. The control circuit selectively activates only the necessary ramp DACs corresponding to the current display region or column being updated, rather than activating all DACs simultaneously. This dynamic activation reduces the effective complexity at any given moment while maintaining the capability to drive high-resolution displays when needed.
Solution Approach 2:
The patent employs periodic scanning of display columns, where ramp DACs are activated in sequential groups corresponding to different column segments. This periodic activation pattern allows the system to maintain high resolution capability while reducing the instantaneous complexity and power consumption by only activating the necessary subset of DACs for the current scanning period.
Data Source
AI summary
An AMOLED display panel includes a pixel display array including a plurality of pixel circuits arranged in an array. A gate driving circuit is adapted to provide a gate scan signal to the pixel circuits. The gate scan signal is used to control an operation stage of the pixel circuits. A source driving circuit is provided with a digital video signal and adapted to generate a data voltage in accordance with the digital video signal. The data voltage is used to control a light-emitting state of a light-emitting element in the plurality of pixel circuits. The pixel display array, the gate driving circuit and the source driving circuit are integrated on the same chip substrate. The source driving circuit is adapted to be coupled to a panel control circuit external to the chip substrate.