Field-Sequential Projector Voltage Measurement Stabilization
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Solution Overview
Problem
Existing field-sequential projector devices face difficulties in accurately measuring the forward voltage of light-emitting diodes during very short lighting duration periods, as the measurement timing is often predetermined and may not account for voltage instability immediately after lighting starts.
Innovation Solution
A field-sequential projector device that includes a storage unit for lighting pattern information, a drive control unit to light the LEDs in a preset pattern, and a voltage measurement unit that determines a longer lighting duration period as a target period after a setting period has elapsed, allowing for accurate voltage measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the forward voltage is measured during the lighting duration period of the light-emitting diode, then the measurement can be performed during operation, but the voltage becomes unstable immediately after lighting starts making accurate measurement difficult
Solution Approach 1:
The system performs a preliminary action by introducing a setting period before the measurement period. During this setting period, the light-emitting diode is lit first to allow voltage stabilization, and only after this period elapses is the forward voltage measured. This preliminary lighting action ensures that when measurement occurs, the voltage has already stabilized, resolving the contradiction between measuring during operation and avoiding voltage instability.
2Ease of operation
If the measurement timing is predetermined according to IC specification, then the measurement process is simplified, but it becomes difficult to properly measure the forward voltage when the lighting duration period is very short
Solution Approach 1:
The system applies dynamics by making the measurement timing flexible rather than fixed. The control unit dynamically determines the measurement timing based on the actual lighting duration period, ensuring that the setting period elapses before measurement regardless of how short the overall lighting duration is. This dynamic adjustment maintains measurement accuracy while adapting to different lighting duration conditions.
3Measurement precision
If the lighting duration period is extended to allow proper voltage measurement, then measurement accuracy improves, but the display refresh rate and productivity decrease
Solution Approach 1:
The system applies local quality by concentrating the measurement action into a very specific local time window. Rather than extending the lighting duration period, the control unit identifies a brief measurement period within the existing lighting duration where voltage has stabilized. This localized measurement approach maintains high display refresh rates while achieving accurate forward voltage measurements during the stable voltage window.
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
Enables the measurement of forward voltage during an appropriate lighting duration period, avoiding voltage instability issues and ensuring accurate readings.
Implementation Method 1
generates the display light representing an image by a display element including a DMD (Digital Micromirror Device) based on the light emitted by a plurality of light-emitting diodes having different lighting colors from each other
Implementation Method 2
In the field-sequential method, the light-emitting diodes are sequentially lighted for a short period (hereinafter referred to as lighting duration period) in units of is to express a mixed color using the afterimage phenomenon
Data Source
AI summary
A projector device includes: a storage unit storing lighting pattern information indicating the lighting start timing of an LED and the time sequence of a lighting continuation period from the lighting start timing; a drive control unit that causes the LED to light on the basis of the lighting pattern information; and a voltage measurement unit. The voltage measurement unit refers to the lighting pattern information and determines, for a target period, a lighting continuation period that is longer than a preset set period. The voltage measurement unit measures the forward voltage within the determined target period from the start of the period until a timing after the set period has elapsed.