Current Generation Supply Circuit for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In current self-luminescent display devices with active-matrix drive methods, the miniaturization of display panels leads to increased complexity and difficulty in controlling the operating speed of data drivers, resulting in unstable luminescent characteristics and deteriorated display quality due to variations in drive current values over time.
Innovation Solution
A current generation supply circuit that includes a signal holding circuit, a current generation circuit, and an operational state setting circuit, which generates and supplies drive currents corresponding to digital signals, utilizing a current mirror circuit and charge storage to manage current values and refresh operations, thereby enhancing the operating speed and reducing circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If display panel is miniaturized to reduce size, then portability and integration are improved, but operating speed control of data driver becomes difficult and circuit complexity increases
Solution Approach 1:
The data driver circuit is divided into multiple independent current generation supply circuits, each responsible for generating drive currents for specific data lines. This segmentation allows each sub-circuit to be optimized independently, reducing overall complexity while maintaining miniaturization benefits.
Solution Approach 2:
Drive currents are generated and stored in advance using charge storage circuits before being supplied to the display pixels. This preliminary action enables faster current delivery and reduces the complexity of real-time current control during display operation.
2Speed
If operating speed of data driver is increased to improve display response, then display response speed is improved, but current control stability deteriorates due to variations over time
Solution Approach 1:
The current generation supply circuit incorporates feedback mechanisms that continuously monitor and adjust drive current values to compensate for variations over time. This feedback control maintains current stability even at high operating speeds, resolving the contradiction between speed and reliability.
Solution Approach 2:
The circuit dynamically adjusts current generation parameters based on operating conditions and aging effects. By changing parameters such as reference current values and timing characteristics, the circuit maintains stable current control across varying operating speeds and time periods.
3Manufacturing precision
If drive current values are adjusted to maintain luminescent characteristics, then display quality is improved, but circuit complexity increases due to additional control mechanisms
Solution Approach 1:
The current generation supply circuit is designed to perform multiple functions including current generation, timing control, and stability compensation within a single integrated circuit. This multi-functionality achieves precise luminescent characteristic control without proportionally increasing circuit complexity.
Solution Approach 2:
The circuit automatically compensates for current variations and maintains luminescent characteristics through self-adjusting mechanisms. This self-service capability reduces the need for external control circuits and complex adjustment mechanisms, achieving precision without excessive complexity.
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 significantly increases the operating speed of data drivers, improves display response speed, and enhances image quality by stabilizing current values and reducing circuit complexity, addressing the challenges of miniaturization and stability in display panels.
Implementation Method 1
utilizing a current mirror circuit and charge storage to manage current values
Implementation Method 2
utilizing a current mirror circuit and charge storage to manage current values and refresh operations
Data Source
AI summary
A current generation supply circuit which supplies drive currents corresponding to digital signals for a plurality of loads comprising a signal holding circuit which takes in and holds the digital signals, a current generation circuit which generates the drive currents having a ratio of current values corresponding to the values of the digital signals held in the signal holding circuit relative to the reference current supplied from a constant current source and supplied to the loads, and an operational state setting circuit which overlaps in terms of time and sets the operating state in the signal holding circuit and the current generation circuit in order to execute at least a take-in and hold operation of the digital signals in the signal holding circuit and a generation supply operation of the drive currents in the current generation circuit; as well as raises the operating speed of the current generation supply circuit.