发明名称 |
Backlight variation compensated display |
摘要 |
Methods and apparatus are provided for compensating a liquid crystal display for changes in brightness level. The apparatus comprises a variable brightness back-light optically coupled to a display panel whose properties depend upon back-light brightness. An electrical circuit measures back-light brightness and/or display flicker and sends this information to a controller. The controller automatically determines a display panel compensation signal based on back-light brightness and/or display flicker, and sends this compensation signal to the display panel to optimize the display panel properties for the commanded or observed back-light brightness level or flicker level so as to, for example, minimize display panel flicker and/or ghost image retention. Such automatic compensation is especially useful for head-up displays that must accommodate large variations in display brightness, e.g., from starlight to full sun, and/or for large, bright projection displays adapted to operate in different ambient light conditions where back-light brightness variation is desirable. |
申请公布号 |
US9093041(B2) |
申请公布日期 |
2015.07.28 |
申请号 |
US200511288497 |
申请日期 |
2005.11.28 |
申请人 |
HONEYWELL INTERNATIONAL INC. |
发明人 |
Schmidt John F. L.;Haim Victoria P.;Haim Elias S. |
分类号 |
G09G3/36;G09G3/34 |
主分类号 |
G09G3/36 |
代理机构 |
Ingrassia Fisher & Lorenz, P.C. |
代理人 |
Ingrassia Fisher & Lorenz, P.C. |
主权项 |
1. A liquid crystal display having compensation for varying brightness levels, comprising:
a dimmable back-light configured to provide varying brightness levels; a display panel, optically coupled to the back-light for receiving illumination therefrom, and whose properties depend upon the varying back-light brightness levels and having a first input configured to receive a compensating signal proportional to the varying back-light levels, the first input coupled to a common terminal of the display panel adapted to receive a common voltage; an electrical circuit configured to receive back-light brightness level information that is proportional to an ambient light level; a non-volatile memory configured to store values of an optimum display panel compensating signal as a function of back-light brightness levels; and a controller coupled to the memory, the electrical circuit and the display panel, the controller configured to retrieve from the memory the optimum display panel compensating signal corresponding to the back-light brightness level received from the electrical circuit, and transmit such optimum display panel compensating signal to the first input. |
地址 |
Morristown NJ US |