Pixel Circuit Amplitude and Pulse-Length Control for Micro-LED Gray Displays
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Solution Overview
Problem
High-resolution display products using micro-inorganic light-emitting diodes face issues with color coordinate drift, low external quantum efficiency, and flickering due to difficulty in accurately controlling current amplitude and time length for low-gray tone display.
Innovation Solution
A pixel circuit with a current control sub-circuit and time-length control sub-circuit is employed, where the current control sub-circuit provides current signals of varying amplitudes, and the time-length control sub-circuit controls the duration of these signals to ensure accurate gray tone representation by alternating the light-emitting element's working state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current amplitude and time length are controlled for low-gray tone display, then display quality and uniformity are improved, but device complexity increases due to additional control circuits
Solution Approach 1:
The control system is segmented into two independent sub-circuits: a current control sub-circuit that controls current amplitude through current data lines, and a time-length control sub-circuit that controls light-emitting duration through time-length data lines. This segmentation allows each sub-circuit to be optimized independently while working together to achieve precise gray tone control without excessive overall complexity.
Solution Approach 2:
The pixel circuit integrates multiple functions into a unified structure that simultaneously handles current control and time-length control. The same pixel circuit architecture can control both the amplitude and duration of light emission, making the system multi-functional and reducing the need for separate dedicated circuits for each control parameter.
2Use of energy by moving object
If current amplitude is reduced for low-gray tone display, then power consumption decreases, but color coordinate drift and flickering occur due to insufficient current control precision
Solution Approach 1:
The system uses periodic pulse signals with variable time lengths to control light emission. Instead of relying solely on small current amplitudes, the invention varies the duration of current pulses periodically applied to the light-emitting element. This allows low gray tones to be achieved through shorter pulse durations rather than extremely small currents, maintaining color stability while reducing power consumption.
Solution Approach 2:
The invention changes the control parameter from solely current amplitude to a combination of current amplitude and time length. By introducing time length as an additional controllable parameter, the system can achieve precise gray tone control through varying pulse durations, which prevents color coordinate drift that occurs when attempting to control gray tones through current amplitude alone.
3Speed
If signal lines are activated simultaneously, then operation speed is improved, but signal interference occurs between adjacent data lines
Solution Approach 1:
The system activates signal lines in a predetermined sequence rather than simultaneously. Current data lines and time-length data lines are activated in different time periods, with one set of lines being activated before the other. This preliminary sequencing of signal activation prevents interference between adjacent data lines while maintaining efficient operation speed through optimized timing.
Data Source
AI summary
A drive method for a display panel, wherein the display panel includes a plurality of current data lines, a plurality of time-length data lines, a first current selection signal line, a second current selection signal line, a first time-length selection signal line and a second time-length selection signal line, at least one current data line is connected with the first current selection signal line or the second current selection signal line, and at least one time-length data line is connected with the first time-length selection signal line or the second time-length selection signal line; the method includes: providing a valid level signal to the first time-length selection signal line, the second time-length selection signal line, the first current selection signal line and the second current selection signal line.