Method and system for LCD panel light source selection

1. An information handling system LCD panel comprising:

a LCD layer having plural liquid crystal pixels operable to display information;

a back light layer having plural light guide pipes operable to project light through the liquid crystal pixels;

a first light source interfaced with the back light layer to project light at one or more levels through the guide pipes;

a second light source interfaced with the back light layer to project light at one or more levels through the guide pipes; and

a light source controller interfaced with the first and second light sources, the light source controller operable to select the light level projected from the light sources based on one or more predetermined factors;

wherein the one or more predetermined factors comprises an automated system shutdown at a low battery power level, the light source controller further operable to select a light source and light source level associated with reduced power consumption for projecting light during the automated system shutdown.

2. The information handling system LCD panel of claim 1 wherein the first and second light sources comprise a LED light source and an electroflorescent light source.

3. The information handling system LCD panel of claim 1 wherein the one or more predetermined factors comprises the type of power source in use by an associated information handling system.

4. The information handling system LCD panel of claim 1 wherein the light source selected at automated system shutdown is an LED light source.

5. The information handling system LCD panel of claim 1 wherein the one or more predetermined factors comprises the brightness selected for the panel.

6. The information handling system LCD panel of claim 5 wherein the first and second light sources comprise a LED light source and a CCFL light source, the light source controller operable select the LED light source and deselect the CCFL light source for brightness selections below a predetermined level.

7. The information handling system LCD panel of claim 5 wherein the first and second light sources comprise a LED light source and an electroflorescent light source, the light source controller operable to select a brightness level to switch between the LED and electroflorescent light sources so that energy consumption of the LCD panel is reduced.

8. The information handling system LCD panel of claim 7 wherein the light source controller is operable to determine brightness level from average current used by the LED or electroflorescent light source.

9. The information handling system LCD panel of claim 8 wherein the brightness level to switch between the LED and electroflorescent light sources corresponds to approximately 2.5 watts.

10. A method for displaying information on an LCD, the method comprising:

generating information for display with pixels of the LCD;

determining a brightness level selected for display of the information;

selecting a CCFL light sources to illuminate the pixels;

illuminating the pixels with the selected light source;

illuminating the pixels with a LED light source simultaneously with the CCFL light source.

11. The method of claim 10 wherein illuminating the pixels with a LED light source further comprises:

illuminating red, green or blue light sources of the LED light source at varying intensities to superimpose a red, green or blue light over the light provided by the CCFL light source.

12. A portable information handling system comprising:

a processor operable to generate information for display;

a LCD panel interfaced with the processor and operable to display information generated by the processor at selectable brightness levels;

an LED light operable to illuminate the LCD panel;

a CCFL light operable to illuminate the LCD panel;

a battery operable to power the LED light and the CCFL light; and

a light source controller interfaced with the LED light and the CCFL light and operable to select one of the LED and CCFL light sources to illuminate the LCD panel at a selected brightness level that consumes the least battery power, the light source controller further operable to select simultaneous illumination by both the LED and CCFL light sources.

13. The portable information handling system of claim 12 further comprises:

an external power source operable to power the LED and CCFL light sources;

wherein the light source controller is further operable to detect that the external power source is providing power to illuminate the LCD panel and to illuminate the LCD panel with the one or both of the LED and CCFL light sources that displays the information with quality.

14. The portable information handling system of claim 12 wherein the light source controller is further operable to detect changes to the selected brightness level and to re-select a one of the LED and CCFL light sources to illuminate the LCD panel at the changed brightness level that consumes the least power.

15. The portable information handling system of claim 12 further comprising:

an external power source operable to interface with and recharge the battery;

wherein the light source controller is further operable to detect the external power source and to select both the CCFL and LED light sources when the external power source interfaces with the battery.

16. The portable information handling system of claim 15 wherein the LED light source comprises red, green and blue light sources that combine to produce white light and wherein the light source controller is further operable to illuminate the red, green and blue light sources at varying intensities to superimpose a red, green or blue light over light provided by the CCFL light source.

17. The portable information handling system of claim 15 wherein the light source controller comprises strobes of a light source over the illumination from the other light source.