Display Panel Pixel Circuit for Low-Frequency Driving and Smaller Bezels
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Solution Overview
Problem
Existing display panel technologies face challenges with high power consumption, increased bezel size, and image quality issues, particularly when operating at low frequencies, due to the need for additional scan drivers and poor hysteresis characteristics, leading to brightness differences and screen flickering.
Innovation Solution
A display panel configuration using a specific arrangement of N-type metal-oxide-semiconductor (NMOS) and oxide TFTs, with a reduced number of transistors and scan drivers, that includes a light-emitting diode and a driving circuit with a unique connection scheme to optimize power consumption and image quality, reducing bezel size and addressing issues like mura and screen blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional scan drivers are added to drive oxide TFTs, then the display panel can operate at low frequency, but the driving power consumption and bezel size increase
Solution Approach 1:
The gate driver is designed to perform multiple functions: it can drive both LTPS TFTs and oxide TFTs using the same transistor configuration. The driver operates in two modes (first mode for address scan, second mode for self scan) without requiring separate dedicated drivers, thereby reducing overall power consumption while maintaining low frequency driving capability
Solution Approach 2:
The display panel dynamically switches between two operating modes: address scan mode for normal operation and self scan mode for low frequency driving. This dynamic mode switching allows the system to adapt to different driving requirements without permanently incorporating additional hardware that would increase power consumption
2Adaptability or versatility
If additional scan drivers are added to drive oxide TFTs, then the display panel can operate at low frequency, but the bezel size increases
Solution Approach 1:
The gate driver is designed to perform multiple functions: it can drive both LTPS TFTs and oxide TFTs using the same transistor configuration. The driver operates in two modes (first mode for address scan, second mode for self scan) without requiring separate dedicated drivers, thereby reducing bezel size while maintaining low frequency driving capability
Solution Approach 2:
The patent merges the address scan and self scan driving functions into a single gate driver unit. By combining these functions and using the same transistor configuration for both modes, the physical space required for driver circuits is reduced, leading to a smaller bezel size
3Ease of manufacture
If PMOS TFT is used as Driving TFT, then the pixel circuit can be configured, but instantaneous image sticking such as screen blurring occurs due to poor hysteresis characteristics
Solution Approach 1:
The patent changes the transistor type parameter from PMOS to NMOS for the driving TFT. This parameter change improves hysteresis characteristics and eliminates image sticking and screen blurring issues while maintaining the pixel circuit's manufacturability and functionality
4Ease of manufacture
If NMOS LTPS HOP pixel circuit is used, then the pixel circuit can be configured, but mura occurs based on device distribution of the light-emitting device
Solution Approach 1:
The patent changes the transistor type parameter from PMOS to NMOS for the driving TFT. This parameter change improves hysteresis characteristics and eliminates image sticking and screen blurring issues while maintaining the pixel circuit's manufacturability and functionality
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
The solution enables efficient low-frequency driving with reduced power consumption, smaller bezel size, and improved image quality by minimizing the number of transistors and scan drivers, while enhancing hysteresis characteristics and reducing screen blurring.
Implementation Method 1
the respective sub pixels including a light-emitting device comprising a light emitting diode
Data Source
AI summary
A display panel is disclosed. The display panel including a plurality of pixels each including a plurality of sub pixels, the respective sub pixels including a light-emitting device and a driving circuit. Driving circuits included in a display panel may be realized with six N-type metal-oxide-semiconductor thin film transistors (NMOS TFTs) and one Oxide TFT, or realized with five P-type metal-oxide-semiconductor thin film transistors (PMOS TFTs) and two Oxide TFTs making low frequency driving possible, and because the number of TFTs and scan drivers are reduced, manufacturing cost, bezel size and power consumption can be reduced.