Projector Light Source Control via Driver-Specific Functions
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Solution Overview
Problem
Existing projector driver circuits face challenges in adjusting light amounts uniformly across light emitting units due to individual differences, leading to slow adjustments and inaccuracies, especially when using mechanical means.
Innovation Solution
A light source control apparatus with a controller that transmits instruction values to drivers, allowing them to determine driving values using predetermined functions, such as straight lines or multiple linear regions, to adjust light amounts quickly and accurately, even in multi-wavelength band scenarios, while reducing common-mode noise and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mechanical means such as iris are used to adjust light amount, then light amount can be adjusted, but the adjustment speed is limited and slow
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms (iris) with electronic control of light emitting units. The controller transmits instruction values to drivers, which control the driving current of light emitting units to adjust light amount electronically, eliminating mechanical moving parts and achieving fast adjustment speed.
2Manufacturing precision
If different instruction values are generated for each driver to adjust light amounts uniformly, then uniformity can be achieved, but the adjustment process becomes complex and slow
Solution Approach 1:
The patent uses predetermined functions stored in each driver that define the relationship between driving current and light amount. By changing the instruction value parameter and applying the function, each driver automatically determines the appropriate driving current to achieve uniform light output, simplifying the control process while maintaining precision.
Solution Approach 2:
The patent stores predetermined functions in each driver beforehand that characterize the light output characteristics of light emitting units. These functions are prepared in advance to account for individual differences, enabling fast adjustment without real-time complex calculations while ensuring uniformity.
3Manufacturing precision
If individual differences of light emitting units are compensated by generating different instruction values, then light uniformity is achieved, but calculation complexity and time increase
Solution Approach 1:
The patent applies local quality by storing individual predetermined functions in each driver specific to its light emitting unit. Each driver has its own function that characterizes the unique light output characteristics of its associated light emitting unit, allowing customized compensation for individual differences without requiring complex centralized control.
4Speed
If fast light amount adjustment is implemented using electronic control, then adjustment speed improves, but potential differences and noise may increase
Solution Approach 1:
The patent replaces mechanical adjustment with electronic control of light emitting units through drivers. The controller transmits instruction values to drivers, which use predetermined functions to determine driving currents, achieving fast electronic adjustment while maintaining electrical stability and minimizing noise through proper circuit design.
Data Source
AI summary
A light source control apparatus includes a controller, and a plurality of drivers. The controller transmits an instruction value for adjusting a light amount of at least one light emitting unit. Each of the plurality of drivers obtains the transmitted instruction value, and determines, by using a function of a driving value for driving the light emitting unit and the light amount, the function being each set for the light emitting unit, the driving value of the light emitting unit each on the basis of the instruction value.