公开(公告)号：EP2775472A2

公开(公告)日：2014-09-10

申请号：EP14000131.4

申请日：2014-01-14

Applicant: Hitachi Media Electronics Co., Ltd.

Inventor： Ogi, Yuya ,  Seo, Yoshiho ,  Haruna, Fumio ,  Ueda, Toshio ,  Nonaka, Tomoyuki

IPC: G09G3/00

CPC classification number: G09G5/02 ,  G09G3/002 ,  G09G3/025 ,  G09G3/2081 ,  G09G2320/0238 ,  G09G2320/0242 ,  G09G2320/0247 ,  G09G2320/041 ,  G09G2320/0666 ,  G09G2320/103 ,  G09G2360/145 ,  G09G2360/16 ,  H04N9/3135

Abstract: A laser projection display device includes: a laser light source drive means; an attribute amount detection means for detecting the attribute amount of a picture signal; a light sensor (10) that measures the light amounts of the laser light sources; and a temperature sensor (11) that measures the temperatures of the laser light sources. The laser projection display device is configured so that the current vs. light amount output characteristics of the laser light sources with a threshold current and the current gain as a parameter are corrected in accordance with the load amount of the picture signal per frame if the change of the attribute amount exceeds a predefined amount; the light sources are driven at a predefined timing of the vertical blanking interval; controls the threshold currents and current gains in accordance with the light amounts; and the threshold currents and current gains are corrected on the basis of the measured temperatures.

Abstract translation: 激光投影显示装置包括：激光源驱动装置; 属性量检测装置，用于检测图像信号的属性量; 光传感器（10），其测量所述激光光源的光量; 以及测量激光源的温度的温度传感器（11）。 激光投影显示装置被配置为使得具有阈值电流和当前增益作为参数的激光源的电流对光量输出特性根据每帧的图像信号的负载量被校正，如果改变 的属性量超过预定义的量; 在垂直消隐间隔的预定定时驱动光源; 根据光量控制阈值电流和电流增益; 并且基于测量的温度校正阈值电流和电流增益。

公开(公告)号：EP2752839A1

公开(公告)日：2014-07-09

申请号：EP13193452.3

申请日：2013-11-19

Applicant: Hitachi Media Electronics Co., Ltd.

Inventor： Haruna, Fumio ,  Ogi, Yuya ,  Kobori, Tomoki ,  Seo, Yoshiho ,  Hatori, Masayuki ,  Ueda, Toshio

IPC: G09G3/02

CPC classification number: G09G5/10 ,  G09G3/025 ,  G09G2320/0271 ,  G09G2320/043 ,  G09G2320/0606 ,  G09G2320/0633 ,  G09G2320/0673 ,  G09G2360/144

Abstract: A laser beam display device includes a dimming setting input unit into which a dimming value corresponding to one of a plural dimming steps may be input. A first dimming processing unit having plural dimming LUTs stores dimming amounts, regarding the respective dimming steps, with the corresponding gradation levels as indexes. A second dimming processing unit having one gain LUT, holding gains regarding the respective dimming steps, and a multiplier. This creates the indexes for the respective dimming LUTs by multiplying a video signal by the gains, and a light source drive unit drives a laser diode on the basis of reference results obtained by referring to the dimming LUTs of the first dimming processing unit. Thus the luminance of the emission beam of the laser diode, which corresponds to the video signal, is dimmed in accordance with a dimming setting input from the dimming setting input unit.

Abstract translation: 激光束显示装置包括调光设置输入单元，其中可以输入与多个调光步骤之一相对应的调光值。 具有多个调光LUT的第一调光处理单元以相应的灰度级作为指标存储关于各个调光步骤的调光量。 具有一个增益LUT的第二调光处理单元，保持关于各个调光步骤的增益，以及乘法器。 这通过将视频信号乘以增益来创建各个调光LUT的索引，并且光源驱动单元基于通过参考第一调光处理单元的调光LUT获得的参考结果来驱动激光二极管。 因此，对应于视频信号的激光二极管的发射光束的亮度根据来自调光设置输入单元的调光设置输入而变暗。