Signal processing unit and liquid crystal display device

• US 20030222841A1
• Filed: 05/19/2003
• Published: 12/04/2003
• Est. Priority Date: 05/30/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hirosue, Yoji
• Granted Patent: US 7,167,214 B2
• Time in Patent Office: Days
• US Class Current: 345/89
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H04N 21/4318 by altering the content in the rendering process, e.g. blanking, blurring or masking an image region image enhancement or restoration in general G06T5/00
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 5/57 Control of contrast or brightness

Abstract

A signal processing unit in a liquid crystal display device, etc., includes a brightness component appearance frequency measuring unit that measures an appearance frequency of each brightness component in a video signal; a parameter outputting unit that outputs a distribution of each brightness component, as a parameter, based on the appearance frequency of each brightness component measured by the brightness component appearance frequency measuring unit; a changing signal outputting unit that alters an input signal recorded in a recording unit, by using the parameter, and that outputs the input signal as a changing signal; and a brightness component changing unit that changes a distribution of each brightness component, by using the changing signal, and that outputs the video signal in which the distribution of each brightness component is changed.

Claims

1. A signal processing unit in a liquid crystal display device, to which a video signal is input and through which an image is displayed on a liquid crystal panel, comprising:

a brightness component appearance frequency measuring unit that measures an appearance frequency of each brightness component in the video signal;

a parameter outputting unit that outputs a distribution of each brightness component in the video signal, as a parameter, based on said appearance frequency measured by the brightness component appearance frequency measuring unit;

a changing signal outputting unit that alters an input signal recorded in a recording unit, by using said parameter output from the parameter outputting unit, and that outputs said input signal as a changing signal; and

a brightness component changing unit that changes a distribution of each brightness component in the video signal, by using the changing signal which is output from the changing signal outputting unit, and that outputs the video signal in which the distribution of each brightness component is changed.

2. A signal processing unit according to claim 1, wherein the change of the distribution of each brightness component by the brightness component changing unit is carried out by adding said changing signal to each brightness component of said video signal.

3. A liquid crystal display device having a signal processing unit according to claim 1.

4. A liquid crystal display device having a signal processing unit according to claim 2.

5. A real-time system signal processing unit in a liquid crystal display device, to which a video signal is input and through which an image is displayed on a liquid crystal panel, comprising:

a brightness component appearance frequency measuring unit of one frame that measures an appearance frequency of each brightness component for every frame in the video signal,

a parameter outputting unit of one frame that successively outputs a distribution of each brightness component of each frame in the video signal, as a plurality of one frame parameters, based on said appearance frequency of each frame measured by the brightness component appearance frequency measuring unit of one frame;

a changing signal outputting unit of one frame that successively alters input signals recorded in a recording unit, by using said plurality of one frame parameters output from the parameter outputting unit of one frame, and that successively outputs said input signals as a changing signal for one frame; and

a brightness component changing unit in a real-time system that successively changes a distribution of each brightness component of each frame in the video signal, by using the change signal for one frame which is successively output from the changing signal outputting unit of one frame, and that successively outputs the video signal in which the distribution of each brightness component is changed.

6. A signal processing unit in a liquid crystal display device, to which a video signal is input and through which an image is displayed on a liquid crystal panel, comprising:

a brightness component appearance frequency measuring unit that measures an appearance frequency of each brightness component in the video signal;

a successive parameter outputting unit that successively outputs a distribution of each brightness component in the video signal, as a plurality of successive parameters, based on said appearance frequency measured by the brightness component appearance frequency measuring unit;

a serial parameter outputting unit, to which each of said plurality of successive parameters successively output from the successive parameter outputting unit is successively input, and which outputs values linearly changing between respective parameters successively input from the successive parameter outputting unit, as a plurality of serial parameters;

a changing signal outputting unit that alters input signals recorded in a recording unit, by using said plurality of serial parameters output from the serial parameter outputting unit, and that outputs as a changing signal; and

a brightness component changing unit that changes a distribution of each brightness component in the video signal, by using the changing signal which is output from the changing signal outputting unit, and that outputs the video signal in which the distribution of each brightness component is changed.