Title:
視覚刺激のための高精度コントラスト比ディスプレイ装置及び方法
Document Type and Number:
Japanese Patent JP5555252
Kind Code:
B2
Abstract:
Embodiments of the present invention include approaches for controlling light valve devices to improve the range and precision of the contrast ratio and the grayscale levels of a display used for visual field tests. In one embodiment, two or more illumination devices are used to enable the display device to display a wide range of contrast stimuli at precise illumination intensities over a fixed background illumination level. In another embodiment, the gamma curves of the display elements are adjusted to allow greater variations in the brightness of the display.
Inventors:
Johansson, イェーラン アー.
One, インジャン
One, インジャン
Application Number:
JP2011539948A
Publication Date:
July 23, 2014
Filing Date:
December 10, 2009
Export Citation:
Assignee:
Curl Zeiss メディ tech Aktiengesellschaft
International Classes:
A61B3/028; A61B3/024
Attorney, Agent or Firm:
Hironori Onda
Makoto Onda
Jun Honda
Makoto Onda
Jun Honda