Pixel Circuit Emission Control for High-Resolution Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high-resolution displays while preventing flicker phenomena when driving frequency is varied, leading to increased power consumption and non-display areas due to the number of transistors and scan drivers required.
Innovation Solution
The proposed pixel circuit integrates N-type and P-type transistors, with some transistors controlled by an emission control signal instead of scan signals, to prevent flicker and enable high-resolution displays by optimizing the connection and operation of transistors and capacitors within the pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power supplied to pixel circuit and number of transistors is increased to achieve high-resolution display, then display resolution is improved, but non-display area (bezel area) increases due to increased number of scan drivers
Solution Approach 1:
The patent merges the control functions of multiple transistors (6th, 7th, 8th, and 9th transistors) under a single emission control signal, reducing the number of independent scan drivers required. This consolidation decreases the non-display area while maintaining high-resolution display capabilities through optimized transistor control architecture
2Productivity
If separate driving methods are used for threshold voltage compensation period and data writing period, then driving efficiency is improved, but flicker phenomenon and image quality unevenness occur when driving frequency is changed
Solution Approach 1:
The patent implements dynamic control of transistor operations based on driving frequency requirements. The emission control signal dynamically adjusts the timing and duration of transistor activation (6th, 7th, 8th, 9th transistors) to maintain image quality uniformity across varying driving frequencies while preserving high driving efficiency through optimized period-based control
Data Source
AI summary
A pixel includes a light emitting element, first through third transistors, sixth through seventh transistors, a ninth transistor, and a capacitor. The first transistor is connected between supply and a second node and controls a driving current supplied to the light emitting element. The second transistor is connected between a third node and a data line. The third transistor is connected between a first node connected to a gate electrode of the first transistor and the second node. The sixth transistor is connected between the supply and a fifth node connected to an electrode of the first transistor. The seventh transistor is connected between the second node and a fourth node connected to an anode of the light emitting element. The ninth transistor is connected between the fifth node and bias. Gate electrodes of the sixth through seventh transistors and the ninth transistor are connected to a same emission line.