Display Pixel Circuit for Uniform Emission Across Frequencies
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Solution Overview
Problem
Existing display devices face challenges in maintaining uniform light emitting characteristics across pixels, especially when operating frequencies vary, leading to inconsistencies in display quality.
Innovation Solution
The display device incorporates a pixel structure with specific transistors and capacitors that compensate for variations in threshold voltage and current deviations, ensuring consistent light emission by employing a shift compensation transistor and capacitors to stabilize node potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pixel structures are used, then device complexity is low, but light emitting characteristics become non-uniform when operating frequency varies
Solution Approach 1:
The pixel circuit performs threshold voltage compensation and node potential stabilization in advance during the non-emission period. The first capacitor C1 stores the threshold voltage of the fifth transistor T5, while the second capacitor C2 stores the potential of the second node NB. This preliminary compensation ensures uniform light emitting characteristics when the operating frequency changes, without requiring complex external compensation circuits.
2Productivity
If operating frequency increases, then productivity improves, but light emitting uniformity deteriorates due to insufficient compensation time
Solution Approach 1:
The pixel circuit maintains continuous compensation action throughout the non-emission period regardless of operating frequency changes. The capacitors C1 and C2 continuously hold the compensated threshold voltage and node potential, ensuring that the compensation effect persists even when the emission period is shortened at high operating frequencies. This enables the pixel to maintain uniform light emitting characteristics across a wide range of operating frequencies.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration maintains uniform light emitting characteristics across pixels, enhancing display quality by stabilizing node potentials and reducing luminance deviations, even when operating frequencies change.
Implementation Method 1
A light emitting display device among display devices displays an image by using a light emitting diode that generates light through the recombination of electrons and holes
Implementation Method 2
a first capacitor connected between a first node and a voltage line
Implementation Method 3
a second capacitor connected between the third node and a fourth node
Data Source
AI summary
A display device includes a display panel including a pixel. The pixel includes: a light emitting element; a first capacitor between a first node and a voltage line; a first transistor connected to the first node, the voltage line, and a second node; a second transistor connected between the first node and a third node and for receiving a first scan signal; a third transistor connected between the second node and the third node and for receiving a second scan signal; a second capacitor connected between the third node and a fourth node; a fourth transistor connected between the fourth node and a data line and for receiving a third scan signal; and a fifth transistor connected between the second node and the light emitting element and for receiving a first emission control signal.