Modular Inorganic Display Driving for Uniform Color and Low Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panels using inorganic light-emitting elements face challenges in achieving improved color reproducibility, luminance uniformity, power consumption, and image distortion when combining multiple modules, due to issues with driving current magnitude affecting wavelength and threshold voltage deviations.
Innovation Solution
A modular display panel design with a pixel array of inorganic light-emitting elements and subpixel circuits, where each display module is driven in a specific order to reduce peak power consumption and luminance non-uniformity, using a progressive driving method and separate control signals for each module to minimize image distortion at boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic light-emitting elements are driven using pulse amplitude modulation (PAM) to express grayscale, then power consumption can be controlled, but wavelength changes based on driving current magnitude reduce color reproducibility
Solution Approach 1:
The patent applies pulse width modulation (PWM) instead of PAM, using periodic on/off switching of the light-emitting elements at different duty cycles to control grayscale. This periodic action maintains constant current magnitude during emission, preventing wavelength shifts while achieving power control through temporal modulation rather than amplitude modulation.
2Area of stationary object
If multiple display modules are combined to form a large display panel, then the display area is increased, but image distortion occurs at boundaries between modules
Solution Approach 1:
The patent divides the large display into multiple independently controllable modules, each with its own driving circuit. By segmenting the display and using separate driving units for each module, the system can independently adjust and calibrate each module's output, thereby compensating for boundary distortions and achieving uniform image quality across the entire display area.
Solution Approach 2:
The patent implements local compensation mechanisms where each display module has independent driving circuits that can adjust parameters locally. This allows for position-specific calibration of brightness, color, and timing parameters at module boundaries, ensuring uniform image quality across the entire display while maintaining the benefits of modular construction.
3Speed
If display modules are driven simultaneously in parallel, then driving speed is improved, but peak power consumption increases due to simultaneous light emission
Solution Approach 1:
The patent uses sequential scanning drive where different row groups are activated at different time periods within each frame. This periodic activation pattern allows the driving circuit to maintain high speed operation by quickly switching between row groups, while the peak power consumption is reduced because only a portion of the display emits light at any given moment, rather than the entire display simultaneously.
Solution Approach 2:
The patent activates only a subset of row groups at any given time rather than driving the entire display simultaneously. By applying partial action to portions of the display at different time intervals, the system achieves the required refresh rate through rapid sequential updates while keeping peak power consumption within acceptable limits.
4Illumination intensity
If inorganic light-emitting elements are driven with high current to increase luminance, then brightness is improved, but luminance non-uniformity increases due to threshold voltage deviations
Solution Approach 1:
The patent implements local compensation circuits within each pixel that measure and correct for threshold voltage deviations of individual transistors. By applying local quality adjustments at the pixel level rather than uniform driving across the entire display, the system can maintain high luminance output while compensating for manufacturing variations, thereby achieving both high brightness and uniform luminance distribution.
Solution Approach 2:
The patent incorporates feedback mechanisms where the actual luminance output is monitored and used to adjust driving parameters in real-time. This feedback loop compensates for threshold voltage deviations and other variations, allowing the system to maintain consistent luminance uniformity across the display even when operating at high current levels for increased brightness.
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 enhances color reproducibility, reduces power consumption, and minimizes image distortion and luminance non-uniformity by optimizing the driving method and circuit design, ensuring stable and efficient operation across multiple display modules.
Implementation Method 1
a pixel array including pixels arranged in a plurality of row lines, each of the pixels including a plurality of inorganic light-emitting elements
Data Source
AI summary
A display apparatus includes: a modular display panel including a plurality of display modules; and a timing controller. Each of the plurality of display modules includes: a display panel including a pixel array and subpixel circuits; and a driving unit which drives the subpixel circuits such that inorganic light-emitting elements in the pixel array successively emit light in a first order of multiple row lines or in a second order opposite to the first order. The timing controller provides the driving unit of a first display module with first control signals for causing the inorganic light-emitting elements of the first display module to emit light in the first order, and provides the driving unit of a second display module, which is positioned above or below the first display module, with second control signals for causing the inorganic light-emitting elements of the second display module to emit light in the second order.