DLP Display Driver Circuit Brightness Enhancement
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Solution Overview
Problem
Current DLP projectors are limited in image brightness due to constraints in the duty cycle of the driving signal, which restricts their ability to meet high-brightness application requirements.
Innovation Solution
A display device comprising a multi-color strobe decoder, pseudo signal circuit, and single-color driving circuit that allows for a full duty cycle current and bias voltage management to enhance brightness, enabling continuous illumination of luminescent devices while conforming to TI system specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the duty cycle of the driving signal conforms to TI specification, then the system operates reliably according to manufacturer guidelines, but the image brightness is limited and cannot meet high-brightness application requirements
Solution Approach 1:
The patent segments the color display into separate red, green, and blue luminescent devices that are driven independently. Each color channel can be controlled with its own duty cycle optimization, allowing the system to achieve higher overall brightness while maintaining color accuracy. The segmentation of color channels enables bypassing the limiting duty cycle constraint of traditional DLP systems.
Solution Approach 2:
The patent employs periodic strobe signals to drive the luminescent devices at frequencies above human visual perception (persistence of vision). By using high-frequency periodic modulation of each color channel separately, the system achieves continuous illumination effect while allowing each channel to operate at optimized duty cycles for maximum brightness without violating TI specifications.
2Illumination intensity
If a full duty cycle current is used to drive the luminescent devices, then higher brightness is achieved, but the bias voltage management becomes more complex
Solution Approach 1:
The patent introduces a pseudo-signal circuit as an intermediary between the control logic and the luminescent devices. This pseudo-signal circuit generates the necessary bias voltages dynamically based on the operational state, simplifying the overall voltage management while enabling full duty cycle operation. The intermediary circuit handles the complexity of bias voltage switching, allowing the main control system to focus on brightness optimization.
Solution Approach 2:
The patent dynamically changes the bias voltage parameters based on the operational requirements of each luminescent device. By adjusting bias voltage levels and timing according to the specific needs of red, green, and blue LEDs, the system achieves optimal brightness output while managing voltage complexity through adaptive parameter control rather than fixed rigid voltage management.
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 DLP projectors to achieve higher brightness levels by optimizing the duty cycle and bias voltage management, effectively meeting high-brightness application demands without violating existing system limitations.
Implementation Method 1
a first luminescent device, a multi-color strobe decoder, a second luminescent device coupled to the multi-color strobe decoder
Data Source
AI summary
A display device includes a first luminescent device, a second luminescent device, a multi-color strobe decoder, a pseudo signal circuit and a single-color driving circuit. The multi-color strobe decoder is configured to generate two gate control signals. The second luminescent device and the pseudo signal circuit are coupled to the multi-color strobe decoder. The single-color driving circuit is coupled to the first luminescent device and the multi-color strobe decoder. When the single-color driving circuit provides first current for driving the first luminescent device according to the first gate control signal and/or a brightness enhancing signal, the pseudo signal circuit is configured to couple a first bias voltage to the multi-color strobe decoder according to the first gate control signal. When the second gate control signal drives the second luminescent device, the second luminescent device is configure to couple a second bias voltage to the multi-color strobe decoder.