Abstract: An optical device and a projection system incorporating same is disclosed. The optical device includes a light management element. The light management element includes an electrically conductive light absorber that is disposed in a display area for controlling a viewing angle of light transmitted through the display area. The conductive light absorber is configured to generate a signal in response to a touch in the display area. The signal is capable of being used to determine information related to the touch.

Abstract: A reflective polarizer suitable for use in a display device is disclosed herein. The reflective polarizer comprises: a multilayer optical film comprising alternating layers of first and second polymeric layers that reflects light of a first polarization state and transmits light of a second polarization state, wherein for normally incident light of the second polarization state, the reflective polarizer has an internal percent transmission of at least 95% at 410 nm, and at most 25% at 380 nm. Also disclosed herein is a display device comprising the reflector polarizer.

Abstract: Conductive polymers can be used as the signal carrying layers in resistive touch screens. Using conductive polymers can allow higher sheet resistance than is conventionally obtained using indium tin oxide while maintaining electrical continuity and durability of the layer. Higher sheet resistance can also lead to reduced errors and reduced power consumption, as well as better optical transmission. Sheet resistance may be limited on an upper end by desired data sampling rates. Also disclosed are resistive touch screens that employ a conductive polymer on both the topsheet and bottom substrate and that can be operated with the use of conventional electronics.

Abstract: Optical devices using reflective polarizers and, in particular, diffusely reflective polarizers are provided. Many of the optical devices utilize the diffusely reflecting and specularly transmitting properties of diffusely reflecting polarizers to enhance their optical characteristics. The optical devices include a lighting system which uses a reflector formed from a diffusely reflecting polarizer attached to a specular reflector. Another optical device is a display apparatus which uses a diffusely reflecting polarizer layer in combination with a turning lens which folds shallow angle light toward a light modulating layer. Other optical devices exploit the depolarizing characteristics of a diffusely reflecting polarizer when reflecting light. Still other optical devices use diffusely reflecting polarizers to recycle light and improve display illumination.