Display Device Pixel Compensation and Power Control
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Solution Overview
Problem
As display panel sizes and resolutions increase, RC delay issues lead to longer data programming times, making it difficult to drive active matrix display devices, especially when displaying stereoscopic images, which require higher driving frequencies. Additionally, large OLEDs increase parasitic capacitance, causing power consumption issues and potential black spots due to backward voltage application and power source voltage swings.
Innovation Solution
A display device configuration that includes a data driver, scan driver, compensation control signal unit, power controller, and timing controller to manage voltages and control signals, ensuring low capacitance, preventing backward voltage application, and stabilizing power source voltages, thereby reducing power consumption and preventing image quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display panel size and resolution are increased, then the display quality is improved, but the RC delay increases causing longer data programming time
Solution Approach 1:
The frame period is divided into two independent scan periods, allowing data programming to occur simultaneously in parallel across different pixel regions. This segmentation of the scanning process enables high-resolution displays to maintain fast programming speeds by processing multiple pixel groups concurrently rather than sequentially.
2Adaptability or versatility
If the display device operates at high driving frequency for stereoscopic images, then the stereoscopic display performance is improved, but the manufacturing cost increases
Solution Approach 1:
The same pixel circuit and driver infrastructure is used for both plane and stereoscopic image display modes. By controlling the light emission period duration and scanning sequence, the display device can switch between displaying plane images (longer emission period) and stereoscopic images (shorter emission period with dual-image sequencing), eliminating the need for separate hardware systems for different display modes.
3Area of stationary object
If the OLED area is increased for large display panels, then the display size is improved, but the parasitic capacitance increases causing higher power consumption
Solution Approach 1:
The display operates with periodic light emission periods followed by reset and compensation periods. By optimizing the duty cycle (ratio of light emission period to total frame period) and using simultaneous scanning for large panels, the system maintains efficient power utilization. The periodic reset and compensation operations are timed to minimize interference with light emission, ensuring that larger OLED areas do not proportionally increase power consumption.
Data Source
AI summary
A display device includes a data driver; a scan driver; a compensation control signal unit configured to reset voltages of data signals transmitted to a plurality of pixels during a previous frame at a current frame, and configured to generate and transmit a first control signal to compensate for threshold voltages of driving transistors of the pixels and a second control signal to control simultaneous light emission of the pixels; a power controller configured to control and supply the voltage levels of a first and second power source voltages; a display unit including the plurality of pixels coupled to corresponding data lines, scan lines, first control lines, second control lines, first voltage lines, and second voltage lines; and a timing controller configured to generate a plurality of data signals by processing external image signals and generate a plurality of driving control signals for controlling driving of the drivers.