Dual-function light guide for LCD backlight
View Patent ↗A portable computing device includes a housing having an external surface, and an event notifier, a display device, and a light controller disposed within the housing. The event notifier includes an event notification lamp, and a light conduit terminating at the external surface for conveying light between the event notification lamp and the external surface. The display device includes illumination means for improved visualization of information rendered on the display device. The light controller is coupled to the event notifier and the illumination means. The light controller is configured to determine the intensity of ambient light external to the housing via the light conduit, and to adjust the intensity of light emitted by the illumination means in accordance with the determined ambient light intensity.
1. A portable computing device, comprising:
a housing including an external surface;
a display device supported by the housing and including a light source configured to enhance visualization of information rendered on the display device;
an event notifier including an event notification lamp configured to flash on and off during an inactive state, the event notifier further configured to determine an intensity of ambient light external to the housing upon occurrence of a predefined event during an interval between a first flash and a second flash of the event notification lamp; and
a light controller coupled to the event notifier and the light source, the light controller being configured to adjust an intensity of light emitted by the light source in accordance with the intensity of ambient light determined by the event notifier during the interval between the first flash and the second flash.
2. The portable computing device according to claim 1 , further including data input means, and the predefined event comprises user activity at the data input means.
3. The portable computing device according to claim 2 , wherein the data input means comprises one of a keyboard key and a thumbwheel.
4. The portable computing device according to claim 1 , wherein the predefined event comprises a message received at the portable computing device.
5. The portable computing device according to claim 1 , further including:
a light conduit, wherein the light conduit comprises a speaker grille aperture.
6. The portable computing device according to claim 1 , further including:
a light conduit, wherein the light conduit comprises a microphone grille aperture.
7. The portable computing device according to claim 1 , wherein the display device comprises a liquid crystal display, and the light source comprises a display backlight.
8. In a portable computing device comprising a housing, and an event notifier, an event notification lamp, and a display device disposed within the housing, a method of controlling visualization of information rendered on the display device, the method comprising:
flashing the event notification lamp on and off during an inactive state;
determining, by the event notifier, an intensity of ambient light external to the housing upon occurrence of a predefined event during an interval between a first flash and a second flash of the event notification lamp; and
adjusting an intensity of light emitted by the display device in accordance with the intensity of ambient light determined by the event notifier during the interval between the first flash and the second flash.
9. The method according to claim 8 , wherein the portable computing device includes data input means, and the predefined event comprises user activity at the data input means.
10. The method according to claim 9 , wherein the data input means comprises one of a keyboard key and a thumbwheel.
11. The method according to claim 8 , wherein the predefined event comprises a message received at the portable computing device.
12. A non-transitory computer-readable medium carrying computer processing instructions for a portable computing device, the portable computing device comprising a housing, an event notifier, an event notification lamp, a display device and data processing means disposed within the housing, when executed the computer processing instructions causing the data processing means to:
flash the event notification lamp on and off during an inactive state;
determine, by the event notifier, an intensity of the ambient light upon occurrence of a predefined event during an interval between a first flash and a second flash of the event notification lamp; and
adjust an intensity of light emitted by the display device in accordance with the intensity of ambient light determined by the event notification lamp during the interval between the first flash and the second flash.