Browse Prior Art Database

Liquid Crystal Display With Adjustable Back Lighting

IP.com Disclosure Number: IPCOM000040130D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Dickerson, JA: AUTHOR [+2]

Abstract

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.

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Liquid Crystal Display With Adjustable Back Lighting

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. By changing the voltage between the transparent electrodes 12 and 14 using the power supply 16, the transmissivity of the electrochomic layer 10 can be changed to vary the amount of attenuated light leaving the shutter at the right side. Figs. 2 and 3 show two different embodiments of a liquid crystal display in which an inorganic shutter could be used to provide adjustable lighting. Fig. 2 shows a transmissive system in which the inorganic shutter S is interposed between a light source LS and the liquid crystal display LCD. A diffuser D is interposed between the shutter S and the light source LS. The transmissivity of the inorganic shutter S can be adjusted to control the amount of lig...