Apparatus and method to improve quality of moving image displayed on liquid crystal display device

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of control lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the control lines via switching elements;
• a plurality of first backlights arranged on the backside of said liquid crystal panel and separated from each other;
• and
• a plurality of second backlights each adjacent to said first backlights but separated from each other, wherein
• said first backlights and said second backlights are alternately turned on and off.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of control lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the control lines via switching elements;
• a plurality of backlights on the backside of said liquid crystal panel arranged along said scanning lines;
• and
• a control circuit for controlling said scanning lines and turning on and off said backlights in synchronization with a scanning period of said scanning lines.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of control lines for transmitting control signals laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the control lines via switching elements;
• a light guide plate facing said liquid crystal panel;
• and
• a backlight arranged at one end of said light guide plate and supplying light to said light guide plate along said scanning lines, wherein
• said light guide plate comprises a plurality of luminescent parts disposed along said scanning lines, for collecting light guided therein and emitting the light toward said liquid crystal panel.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning lines via switching elements,
• the device having a hold control function in which an image to be displayed is output in one entire frame period and an impulse control function in which an image to be displayed is output in a predetermined period within one frame period, wherein:
• said hold control is carried out when said display image is a still image;
• said impulse control is carried out when said display image is a moving image;
• and
• said impulse control is carried out by scanning each of said scanning lines twice per one frame period and writing said display data and reset data in said pixel electrodes.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning lines via switching elements,
• the device having a hold control function in which an image to be displayed is output in one entire frame period and an impulse control function in which an image to be displayed is output in a predetermined period within one frame period, wherein:
• said hold control is carried out when said display image is a still image;
• said impulse control is carried out when said display image is a moving image;
• and
• said display image is judged to be said moving image when averages of DC components in each said display image in one frame and said image displayed in an immediately preceding frame differs by a predetermined value or more.

A the liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning line via switching elements, the liquid crystal panel comprising a plurality of control blocks divided into n portions (n≧4) along said scanning lines;
• and
• a plurality of backlights facing each of said control blocks, wherein
• said liquid crystal panel carries out hold driving in which each of said scanning lines is scanned once in one frame period and said display data are written in said pixel electrodes,
• said backlights corresponding to each of said control blocks are turned on for a predetermined period immediately before scanning said scanning lines in the control blocks, and
• a response time of each pixel in said liquid crystal panel is smaller than:
• 1 frame period×(n−2)/n.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning line via switching elements, the liquid crystal panel comprising a plurality of control blocks divided into n portions (n≧3) along said scanning lines;
• and
• a plurality of backlights facing each of said control blocks, wherein
• said liquid crystal panel carries out impulse driving in which each of said scanning lines is scanned twice in one frame period and said display data and reset data are written in said pixel electrodes,
• said backlights corresponding to each of said control blocks are turned on for a predetermined period immediately before scanning said scanning lines in the control blocks, and
• a response time of each pixel in said liquid crystal panel is smaller than:
• 1 frame period×[[(n−1)/2n]−(1/n)] (n:
• odd number), or
• 1 frame period×[[(n−2)/2n]−(1/n)] (n:
• even number).

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning lines via switching elements;
• a light guide plate arranged facing said liquid crystal panel, a first polarization splitting sheet, a liquid crystal shutter divided along said scanning lines, a second polarization splitting sheet, and a scattering element, arranged in order on one surface of said light guide plate;
• and
• a light source at one end of said light guide plate for supplying light in said light guide plate along said scanning lines.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and liquid crystal cells are arranged at intersections of the signal lines and the scanning lines;
• and
• a backlight system facing said liquid crystal panel and having a plurality of luminescent parts divided along said scanning lines, and wherein:
• impulse driving in which the luminescent parts are sequentially turned on, and in which said scanning lines corresponding to said luminescent parts are scanned to start writing said display data in said liquid crystal cells when said luminescent parts are turned off is carried out;
• and
• number of said luminescent parts, a ratio of an on-period of the luminescent parts to an off-period within said one frame period, and a response time of said liquid crystal cells are determined so that a change in brightness due to a transient response of the liquid crystal cells after the luminescent parts are turned on is equal to or less than 5% of brightness of said luminescent parts.

A liquid crystal display device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and liquid crystal cells are arranged at intersections of the signal lines and the scanning lines;
• and
• a backlight system facing said liquid crystal panel, and wherein:
• impulse driving in which said scanning lines are sequentially scanned while said backlight system is turned on and off, and said display data are written in said liquid crystal cells is carried out;
• and
• said display data written in said liquid crystal cells within a predetermined time before and after said backlight system is turned off are estimated data generated by carrying out motion compensation, when said backlight system is turned on.

A method of controlling a liquid crystal display device, the device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of scanning lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the scanning lines via switching elements;
• and
• a liquid crystal panel divided into first pixel regions and second pixel regions adjacent to the first pixel regions, the method comprising the steps of:
• performing impulse driving for activating said control signals to be transmitted to each of said scanning lines two times per one frame period in which an image is displayed;
• writing said display data in said first pixel regions and writing said reset data in said second pixel regions respectively when said control signals are activated once of the two times;
• and
• writing said reset data in said first pixel regions and writing said display data in said second pixel regions, when said control signals are activated the other time of the two times.

A method of controlling a liquid crystal display device, the device comprising:

• a liquid crystal panel in which a plurality of signal lines for transmitting display data and a plurality of control lines for transmitting control signals are laid out vertically and horizontally, and pixel electrodes are arranged at intersections of the signal lines and the control lines via switching elements;
• a plurality of first backlights arranged on the backside of said liquid crystal panel, and separated from each other;
• and
• a plurality of second backlights each adjacent to said first backlights but separated from each other, the method comprising the step of
• alternately turning on and off said first backlights and said second backlights.

A method of controlling a liquid crystal display device, the device comprising:

• a data driver for outputting display data to signal lines while a timing signal is active;
• a gate driver for sequentially outputting gate pulses to scanning lines;
• and
• a liquid crystal panel in which pixel electrodes are arranged at intersections of said signal lines and said scanning lines via switching elements, the method characterized in that said data driver outputs reset data during an inactive period of said timing signal in one horizontal period.