Liquid crystal display device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorShunichi Miyadera
Life of this patent
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Abstract
A liquid crystal display device for receiving a video signal and displaying an image corresponding thereto having a liquid crystal display for displaying an image corresponding to a received video signal on a liquid crystal display, and a back light provided for irradiating light thereto. A switch is used for turning ON and OFF the back light. The back light is automatically turned OFF when a predetermined period of time passes in which the video signal, carrying image data in a predetermined condition, is not received.
Claims15
A liquid crystal display device for displaying an image having a liquid crystal display member for displaying an image corresponding to a received video signal having at least a luminance signal, means for irradiating light to said liquid crystal display member, and switch means for turning ON and OFF said irradiating means, said liquid crystal display device comprising:
- means for examining said received video signal having at least a luminance signal, said examination means examining said signal based upon an average level of the luminance signal contained in said video signal;
- timer means for measuring a period of time, said timer means being reset when said average level of said luminance signal contained in said video signal is not within a predetermined range;
- and
- control means for controlling said timer means to start measuring said period of time based upon a result of said examination means and for turning OFF said irradiating means if a predetermined period of time has passed since said timer means started measuring said period of time.
A liquid crystal display device for displaying an image in response to a video signal including at least a luminance signal, said liquid crystal display device comprising:
- a liquid crystal display member for displaying said image;
- light means for irradiating light to said liquid crystal display member;
- detecting means for detecting that a predetermined condition of said video signal including a luminance signal is present;
- and
- control means for controlling said light means to turn OFF when said detecting means detects a predetermined condition is present for a predetermined period of time;
- said detection means comprises examination means for examining said signal and indicating when said predetermined condition is present, said examination means examining said signal to determine an average level of the luminance signal component of said signal and timer means for measuring said predetermined period of time, said timer means is reset when said average level of said luminance signal component of said signal is not within a predetermined range.
A liquid crystal display device for displaying an image having a liquid crystal display member for displaying an image corresponding to a received video signal having at least a luminance signal, means for irradiating light to said liquid crystal display member and means for turning said irradiating means ON and OFF, said liquid crystal display device comprising;
- means for examining a predetermined condition of said luminance signal of said video signal;
- timer means for measuring a period of time;
- means for resetting said timer means when an average level of said luminance signal of said video signal is not within a predetermined range;
- and
- control means for controlling said timer means to start measuring said period of time based on a result of an examination, by said examining means, of said luminance signal, and for turning OFF said irradiating means if a predetermined period of time has passed after said timer means started measuring said period of time.
A liquid crystal display device for displaying an image having a liquid crystal display member for displaying an imaging corresponding to a received video signal having at least a luminance signal, means for irradiating light to said liquid crystal display member and means for turning said irradiating means ON and OFF, said liquid crystal display member comprising:
- means for examining a predetermined condition of luminance signal of said video signal, said examining means comprising means for determining whether an average level of said the luminance signal of said video signal is between first and second predetermined reference values;
- timer means for measuring a period of time;
- and
- control means for controlling said timer means to start measuring said period of time based on a result on an examination, by said examining means of said luminance signal, and for turning OFF said irradiating means if a predetermined period of time has passed after timer means started measuring said period of time.
Dependencies are inferred from the claim text.