Liquid Crystal Display With Adjustable Back Lighting
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
This article describes an inorganic shutter which can be used to adjust the light output from a liquid crystal display panel to compensate for room ambient conditions. The inorganic shutter includes an electrochromic layer sandwiched between two electrodes. Changing the voltage between the two electrodes changes the amount of light transmitted through the electrochromic layer. Referring to Fig. 1, the inorganic shutter includes a layer 10 of amorphous hydrogen tungsten bronze or WO3 sandwiched between two transparent electrodes 12 and 14. A power supply 16 can be used to change the voltage between the electrodes 12 and 14. Glass layers 18 and 20 complete the sandwich. Light is shown being directed into the shutter from the left.