Direct backlighting for liquid crystal displays
First Claim
1. A structure for providing lighting in a liquid crystal display (LCD) having a matrix arrangement of picture elements (pixels), comprising:
- a generally flat liquid crystal (LC) element having a front display surface and a rear mounting surface;
a light source, which is mounted adjacent to said rear surface and oriented to direct light through said LC element in a direction orthogonal to said front surface;
a light intensity controlling means for controlling the light emitted from said light source; and
a color mixing means, which is mounted between the light source and the LC element.
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Accused Products
Abstract
A system and method for backlighting a liquid crystal display consisting of a planar array of uniformly distributed light emitting diodes (LEDs) with segmentation, each LED illuminating one or more colors of a picture element (pixel) or group of pixels. By controlling the current through each LED, infinite variations in intensity and color can be locally generated according to LCD addressing schemes and contents. High quality moving pictures can be generated by incorporating multiple row addressing and LED sequencing. The LED backlight addressing and driving method can be designed and synchronized with the LCD panel row and column driving scheme.
209 Citations
28 Claims
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1. A structure for providing lighting in a liquid crystal display (LCD) having a matrix arrangement of picture elements (pixels), comprising:
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a generally flat liquid crystal (LC) element having a front display surface and a rear mounting surface;
a light source, which is mounted adjacent to said rear surface and oriented to direct light through said LC element in a direction orthogonal to said front surface;
a light intensity controlling means for controlling the light emitted from said light source; and
a color mixing means, which is mounted between the light source and the LC element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28)
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15. A method for directly backlighting a liquid crystal display (LCD) having a plurality of picture element (pixel) areas and a plurality of light emitting diodes (LEDs) configured in a matrix arrangement, comprising the steps of:
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a) loading a predetermined signal value in each one of a plurality of LED column drivers;
b) activating one of a plurality of LED row drivers;
c) activating all of a plurality of column LED drivers;
d) deactivating all row and column drivers;
e) repeating steps a) through d) for a next LCD row; and
f) repeating steps a) through e) in a cyclic manner.
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25. A system for providing background lighting in a liquid crystal display (LCD) having a matrix of picture elements (pixels), comprising:
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a liquid crystal (LC) element;
a planar array of light emitting diodes (LEDs) for illuminating said LC element;
at least one planar array of color cells for coloring the LED illumination;
an electronic controlling means; and
a power source.
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Specification