DAY/NIGHT HUD BACKLIGHTING SYSTEM
First Claim
1. A head up display system comprising:
- an AMLCD;
a high brightness light source for illuminating the AMLCD;
a light transmissive panel transmitting light travelling from the high brightness light source to the AMLCD;
a low brightness light source illuminating the light transmissive panel; and
, wherein the high brightness light source is active during bright light conditions and the low brightness light source is active during low light conditions.
2 Assignments
0 Petitions
Accused Products
Abstract
A head up display (HUD) has multiple light sources of varying intensities for projecting a high quality image under various lighting conditions. The light sources provide illumination through an electronic display (e.g. an AMLCD) in the HUD. A high brightness light source illuminates the electronic display during bright or day light conditions. A low brightness light source illuminates the electronic display during night or low light conditions. Both light sources illuminate the electronic display during intermediate lighting conditions. A light panel conducts and diffuses light from the light sources to illuminate the rear of the electronic display. An optional light mixer reduces uneven lighting of the high brightness light source. In operation, the intensities of the light sources are controlled as a function of ambient lighting conditions to optimize the projected image quality.
16 Citations
36 Claims
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1. A head up display system comprising:
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an AMLCD;
a high brightness light source for illuminating the AMLCD;
a light transmissive panel transmitting light travelling from the high brightness light source to the AMLCD;
a low brightness light source illuminating the light transmissive panel; and
,wherein the high brightness light source is active during bright light conditions and the low brightness light source is active during low light conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A backlight system for a HUD having an electronic display, said backlight system comprising:
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at least one high brightness light source for illuminating the electronic display;
a light transmissive panel interposed between the electronic display and the high brightness light source;
at least one low brightness light source for illuminating the transmissive panel; and
,wherein the high brightness light source illuminates the display in bright light conditions and the low brightness light source illuminates the display in low light conditions. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of backlighting an electronic display for operation in both bright light conditions and low light conditions, comprising the steps of:
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transmitting light from a high brightness light source through a light panel to illuminate the electronic display;
illuminating the edge of the light panel with a low brightness light source to illuminate the electronic display;
sensing ambient light conditions; and
,controlling the brightness of both the high brightness light source and the low brightness light sources responsive to ambient light conditions. - View Dependent Claims (33, 34, 35, 36)
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Specification