Display system having section brightness control and method of operating system
First Claim
1. A display system for displaying a visual image in response to a video signal (10,34), comprising;
- a display consisting of a single LCD panel (1) divided into a plurality of addressable, variable brightness sections (5) wherein different parts of said panel are subject to spurious brightness non-uniformities from section to section of said panel;
address means (6) for generating a section address corresponding to a section in response to a timing signal (11);
driver means (7,8) for varying the brightness of the section in response to a brightness signal (14,15) derived from the video signal (10,34);
a memory (36) for storing a predetermined correction signal (35) corresponding to the section; and
control means (31) coupled to the driver means (7,8) for varying the brightness signal (14,15) to reduce said brightness non-uniformities in the displayed image in response to the video signal (34) and the correction signal (35) in combination.
1 Assignment
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Accused Products
Abstract
A display system for displaying a visual image in response to a video signal (10,34), comprising; a liquid crystal display panel (1) divided into a plurality of addressable, variable brightness sections (5); address circuit (6) for generating a section address corresponding to a section in response to a timing signal (11); driver circuit (7,8) for varying the brightness of the section in response to a brightness signal (14,15) derived from the video signal (10,34); characterised in that the display system further comprises: a memory (36) for storing a predetermined correction signal (35) corresponding to the section; and control circuit (31) coupled to the driver circuit (7,8) for varying the brightness signal (14,15) to reduce brightness non-uniformities in the displayed image in response to the video signal (34) and the correction signal (35) in combination. The control circuit preferably includes a summing circuit for adding the correction signal to the video signal to produce a summed signal for determining the brightness signal. In another preferred embodiment the control circuit includes a voltage control circuit for varying the amplitude of the brightness signal in response to the correction signal.
188 Citations
22 Claims
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1. A display system for displaying a visual image in response to a video signal (10,34), comprising;
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a display consisting of a single LCD panel (1) divided into a plurality of addressable, variable brightness sections (5) wherein different parts of said panel are subject to spurious brightness non-uniformities from section to section of said panel;
address means (6) for generating a section address corresponding to a section in response to a timing signal (11);
driver means (7,8) for varying the brightness of the section in response to a brightness signal (14,15) derived from the video signal (10,34);
a memory (36) for storing a predetermined correction signal (35) corresponding to the section; and
control means (31) coupled to the driver means (7,8) for varying the brightness signal (14,15) to reduce said brightness non-uniformities in the displayed image in response to the video signal (34) and the correction signal (35) in combination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for reducing brightness non-uniformities in a visual image generated in response to a video signal by a display system comprising:
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a display consisting of a single LCD panel divided into a plurality of addressable, variable brightness sections wherein different parts of said panel are subject to spurious brightness non-uniformities from section to section of said panel;
address means for generating a section address for addressing a brightness signal derived from the video signal to a section; and
driver means for varying the brightness of the section in response to the brightness signal;
the method comprising;
storing a predetermined correction signal corresponding to the section in a memory of the display system; and
varying the brightness signal in response to both the video signal and the correction signal to correct for said spurious brightness non-uniformities.
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Specification