Liquid crystal display and electronic equipment

Patent metadata

Field	Value
Publication number	US-10444574-B2
Application number	US-201816039816-A
Country	US
Kind code	B2
Filing date	Jul 19, 2018
Priority date	Jul 31, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A liquid crystal display to suppress a reverse tilt domain that includes pixel electrodes, a first light-shielding film arranged in a first direction along a first side of the pixel electrodes; a second light-shielding film arranged in a second direction along a second side of the pixel electrodes, a correction unit corrects a first input image signal so that a first difference between a first voltage applied to the first pixel electrode and a second voltage applied to a second pixel electrode, and a second difference between the first voltage and a third voltage to be applied to a third pixel electrode are reduced. A width of the first light-shielding film is narrower than a width of the second light-shielding film. The correction unit corrects the first input image signal so that a decreased amount of the first difference is greater than a decreased amount of the second difference.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
an element substrate including the plurality of pixel electrodes;
a counter substrate including a common electrode;
a liquid crystal layer sandwiched between the element substrate and the counter substrate;
a first light-shielding film extending in the first direction along a first side of the plurality of pixel electrodes;
a second light-shielding film extending in the second direction along a second side of the plurality of pixel electrodes;
a liquid crystal panel in which a width of the first light-shielding film is narrower than a width of the second light-shielding film;
a correction unit configured to specify, based on an input image signal, a set of pixel electrodes of the plurality of pixel electrodes to be determined such that a difference in voltage to be applied to each of two pixel electrodes in alignment is greater than or equal to a predetermined value and that a reverse tilt domain occurs, and to correct the input image signal to reduce a difference in the voltage to be applied in a specified set of pixel electrodes; and
a driving unit configured to apply a voltage to the plurality of pixel electrodes based on the input image signal corrected by the correction unit, wherein
the correction unit is configured to:
correct, in a case where two pixel electrodes included in the specified set of pixel electrodes are aligned in the second direction, the input image signal to increase a decreased amount of a difference in the applied voltage in comparison with correction performed in a case where the two pixel electrodes are aligned in the first direction.

2. A liquid crystal display according to claim 1 , wherein
the correction unit is configured to:
correct, in a case where two pixel electrodes included in the specified set of pixel electrodes are aligned in the first direction, the input image signal to reduce a decreased amount of the difference in the applied voltage in comparison with correction performed in a case where the two pixel electrodes are aligned in the second direction.

3. An electronic device comprising the liquid crystal display according to claim 1 .

4. A liquid crystal display comprising:
a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
an element substrate including the plurality of pixel electrodes;
a counter substrate including a common electrode;
a liquid crystal layer sandwiched between the element substrate and the counter substrate;
a first light-shielding film extending in the first direction along a first side of the plurality of pixel electrodes;
a second light-shielding film extending in the second direction along a second side of the plurality of pixel electrodes;
a liquid crystal panel in which a width of the first light-shielding film is narrower than a width of the second light-shielding film; and
a signal processing unit configured to apply a voltage to the plurality of pixel electrodes based on an input image signal, wherein
in a case where an image signal for displaying a pixel corresponding to a first pixel electrode of the plurality of pixel electrodes at a first gray level and for displaying a pixel corresponding to another remaining pixel electrode at a second gray level lower than the first gray level is input as the input image signal, or in a case where an image signal for displaying a pixel corresponding to a first pixel electrode of the plurality of pixel electrodes at a third gray level and displays a pixel corresponding to another remaining pixel electrode at a fourth gray level higher than the third gray level is input as the input image signal, and
the signal processing unit is configured to correct the input image signal, and to apply the voltage to the plurality of pixel electrodes in such a way that a first applied voltage difference is smaller than a second applied voltage difference, a third applied voltage difference is smaller than a fourth applied voltage difference, and the third applied voltage difference is smaller than the first applied voltage difference,
the first applied voltage difference being a difference in applied voltage between the first pixel electrode and a second pixel electrode aligned on a side where a reverse tilt domain easily occurs in the first direction with respect to the first pixel electrode,
the second applied voltage difference being a difference in applied voltage between the first pixel electrode and a third pixel electrode aligned on a side where a reverse tilt domain hardly occurs in the first direction with respect to the first pixel electrode,
the third applied voltage difference being a difference in applied voltage between the first pixel electrode and a fourth pixel electrode aligned on the side where the reverse tilt domain easily occurs in the second direction with respect to the first pixel electrode,
the fourth applied voltage difference being a difference in applied voltage between the first pixel electrode and a fifth pixel electrode aligned on the side where the reverse tilt domain hardly occurs in the second direction with respect to the first pixel electrode.

5. An electronic device comprising the liquid crystal display according to claim 4 .

6. A liquid crystal display comprising:
a plurality of pixel electrodes arranged in a first direction and a second direction intersecting the first direction;
an element substrate including the plurality of pixel electrodes;
a counter substrate including a common electrode;
a liquid crystal layer sandwiched between the element substrate and the counter substrate;
a first light-shielding film extending in the first direction along a first side of the plurality of pixel electrodes;
a second light-shielding film extending in the second direction along a second side of the plurality of pixel electrodes;
a liquid crystal panel in which a width of the first light-shielding film is narrower than a width of the second light-shielding film; and
a signal processing unit configured to apply a voltage to the plurality of pixel electrodes based on an input image signal, wherein
in a case where an image signal for displaying a pixel corresponding to a first pixel electrode of the plurality of pixel electrodes at a first gray level and for displaying a pixel corresponding to another remaining pixel electrode at a second gray level lower than the first gray level is input as the input image signal, or in a case where an image signal for displaying a pixel corresponding to a first pixel electrode of the plurality of pixel electrodes at a third gray level and for displaying a pixel corresponding to another remaining pixel electrode at a fourth gray level higher than the third gray level is input as the input image signal, and
the signal processing unit is configured to correct the input image signal, and to apply the voltage to the plurality of pixel electrodes in such a way that a first transmittance difference is smaller than a second transmittance difference, a third transmittance difference is smaller than a fourth transmittance difference, and the third transmittance difference is smaller than the first transmittance difference,
the first transmittance difference being a difference in transmittance between a pixel corresponding to the first pixel electrode and a pixel corresponding to a second pixel electrode aligned with the first pixel electrode on a side where a reverse tilt domain easily occurs in the first direction,
the second transmittance difference being a difference in transmittance between the pixel corresponding to the first pixel electrode and a pixel correspon

Assignees

• Seiko Epson Corp

Inventors

• Mizusako Kazuhisa
• Hosaka Hiroyuki

Classifications

• G02F2201/123

  pixel · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G02F1/134363 Primary

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• G02F2201/121

  common or background · CPC title