公开(公告)号：WO2014094827A1

公开(公告)日：2014-06-26

申请号：PCT/EP2012/075962

申请日：2012-12-18

Applicant: LEMOPTIX SA

Inventor： ABELÉ, Nicolas ,  ADHAM, Mohammed

IPC: H04N9/31 ,  H01S5/06

CPC classification number: H01S5/0617 ,  G02B26/105 ,  H01S5/0014 ,  H01S5/06216 ,  H04N9/3135 ,  H04N9/3194

Abstract: According to the present invention there is provided a method of operating a laser comprising the steps of; defining an intensity value (K VIDEO red , K VIDEO green , K VIDEO blue ) for a light beam which is to be output from the laser; determining if the defined intensity value is greater than, or less than, a threshold intensity (K TH red , K TH green , K TH blue ) for the laser, wherein the threshold intensity is the intensity of the light which is output from the laser when the input current to the laser is equal to the threshold current (I TH red , I TH green , I TH blue ) of the laser, wherein the threshold current (l TH red , I TH green , I TH blue ) of the laser is an input current value below which the laser would operate in its light emitting region and equal to, or above which, the laser will operate in its laser region; operating the laser using current from at least a DAC current source if the defined intensity value (K VIDEO red , K VIDEO green , K VIDEO blue ) is greater than the threshold intensity (K TH red , K TH green , K TH blue ), wherein the DAC current source operates the laser by inputting to the laser a continuous current which has an amplitude which is greater than the threshold current (I TH red , I TH green , I TH blue ) of the laser, and which has an amplitude such that the laser is operated to output a light beam which has an intensity equal to the defined intensity value (K VIDEO red , K VIDEO green , K VIDEO blue ); and operating the laser using current from the PWM current source only, if the defined intensity value (K VIDEO red , K VIDEO green , K VIDEO blue ) is less than the threshold intensity (K TH red , K TH green , K TH blue ), wherein the PWM current source operates the laser by inputting to the laser a current which has an amplitude which is at least equal to the threshold current value (I TH red , I TH green , I TH blue ) of the laser, and wherein the duration of time over which the PWM current source inputs its current to the laser is such that the laser is operated to output a light beam which has an intensity equal to the defined intensity value (K VIDEO red , K VIDEO green , K VIDEO blue ). There is further provided a corresponding laser driver.

Abstract translation: 根据本发明，提供一种操作激光的方法，包括以下步骤： 定义要从激光器输出的光束的强度值（KVIDEO红色，KVIDEO绿色，KVIDEO蓝色）; 确定所定义的强度值是否大于或小于激光器的阈值强度（KTH红色，KTH绿色，KTH蓝色），其中阈值强度是当输入时从激光器输出的光的强度 激光的电流等于激光器的阈值电流（ITH红色，ITH绿色，ITH蓝色），其中激光器的阈值电流（LTH红色，ITH绿色，ITH蓝色）是输入电流值，在该值以下，激光 将在其发光区域中操作，等于或高于其激光将在其激光区域中操作; 如果定义的强度值（KVIDEO red，KVIDEO green，KVIDEO blue）大于阈值强度（KTH红色，KTH绿色，KTH蓝色），则使用来自至少一个DAC电流源的电流来操作激光器，其中DAC电流源工作 激光器通过向激光器输入具有大于激光器的阈值电流（ITH红色，ITH绿色，ITH蓝色）的幅度的连续电流，并且具有使得激光器被操作以输出光的幅度 光束的强度等于规定的强度值（KVIDEO红，KVIDEO绿，KVIDEO蓝）; 并且如果定义的强度值（KVIDEO red，KVIDEO green，KVIDEO blue）小于阈值强度（KTH红色，KTH绿色，KTH蓝色），则使用来自PWM电流源的电流来操作激光器，其中PWM电流源 通过向激光器输入具有至少等于激光器的阈值电流值（ITH红色，ITH绿色，ITH蓝色）的幅度的电流来操作激光器，并且其中PWM电流源的持续时间 将其电流​​输入到激光器中使得激光器被操作以输出具有等于所确定的强度值（KVIDEO红色，KVIDEO绿色，KVIDEO蓝色）的强度的光束。 还提供了相应的激光驱动器。