Pixel Circuit with Initialization and Compensation Transistors for Low-Frequency Display
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Solution Overview
Problem
Display devices operating at low frequencies face challenges in maintaining display quality due to deviations in luminance, leading to potential image deterioration and flickering issues.
Innovation Solution
The display device incorporates a specific pixel structure with multiple transistors and capacitors, including a third transistor with sub-transistors connected in series, a fourth transistor connected to an initialization voltage line, and a second capacitor between the second reference node and power line, which allows for compensation periods and initialization periods to overlap with scan periods, reducing luminance deviations and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the operating frequency of the display device is lowered to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to luminance deviations and image deterioration
Solution Approach 1:
The patent applies preliminary action by performing initialization and compensation operations before the actual display operation at low frequency. The initialization transistor resets pixel voltages to reference levels before low-frequency operation, and the compensation transistor corrects luminance deviations that occur during low-frequency operation, thereby preventing display quality deterioration before it happens.
2Use of energy by stationary object
If the operating frequency is lowered, then power consumption is reduced, but luminance deviations occur leading to image deterioration
Solution Approach 1:
The patent implements feedback through the compensation transistor that detects and corrects luminance deviations occurring during low-frequency operation. The compensation circuit monitors the actual luminance output and adjusts the pixel voltage to compensate for deviations, ensuring uniform luminance across the display even when operating at reduced frequencies.
3Reliability
If multiple transistors and capacitors are added to the pixel structure for compensation and initialization, then display quality is maintained, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the pixel structure by integrating the initialization transistor, compensation transistor, and storage capacitor within the existing pixel circuit architecture. These additional components are combined with the light-emitting diode and existing transistors to form a unified pixel structure that performs initialization, compensation, and display functions simultaneously.
Data Source
AI summary
A display device includes a display panel including pixels. One of the pixels includes a light emitting diode, a first capacitor connected between a power line receiving a power supply voltage and a first reference node, a first transistor connected between the power line and an anode of the light emitting diode, a second transistor connected between a data line and a first electrode of the first transistor, a third transistor including a plurality of sub-transistors connected between a second electrode of the first transistor and the first reference node in series, and a fourth transistor connected to a second reference node among a plurality of second reference nodes between the sub-transistors and receiving an initialization scan signal.