Projection type display apparatus

Patent metadata

Field	Value
Publication number	US-12260795-B2
Application number	US-202418617892-A
Country	US
Kind code	B2
Filing date	Mar 27, 2024
Priority date	Mar 28, 2023
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

A projection type display apparatus includes a liquid crystal panel including a first panel pixel, a liquid crystal panel including a second panel pixel, an optical path shift element that shifts projection positions of the first panel pixel and the second panel pixel, and a display control circuit that controls the liquid crystal panel and the optical path shift element. The display control circuit causes the optical path shift element to shift the projection position from a first unit period to a fourth unit period of one frame period for each unit period. A centroid of a path on which the first panel pixel is projected from the first unit period to the fourth unit period is different from a centroid of a path on which the second panel pixel is projected from the first unit period to the fourth unit period.

First claim

What is claimed is:

1. A projection type display apparatus comprising:
a first liquid crystal panel including a first panel pixel corresponding to first light;
a second liquid crystal panel including a second panel pixel corresponding to second light;
an optical path shift element configured to shift projection positions of the first panel pixel and the second panel pixel; and
a display control circuit configured to control the first liquid crystal panel, the second liquid crystal panel, and the optical path shift element, wherein
the display control circuit
causes the optical path shift element to shift the projection position every k unit period from a first unit period to a k-th unit period included in one frame period, k being an integer equal to or greater than 2 included in one frame period,
converts pixel data of the first light among pixel data constituting a video image, the pixel data corresponding to the projection position, for each unit period and supplies the converted pixel data to the first panel pixel, and
converts pixel data of the second light, the pixel data corresponding to the projection position, for each unit period and supplies the converted pixel data to the second panel pixel, and
a centroid of a path on which the first panel pixel is projected from the first unit period to the k-th unit period is different from a centroid of a path on which the second panel pixel is projected from the first unit period to the k-th unit period.

2. The projection type display apparatus according to claim 1 , wherein
k is 4,
in the first liquid crystal panel, the first panel pixels are arrayed in a matrix along a first direction and a second direction,
in the second liquid crystal panel, the second panel pixels are arrayed in a matrix along the first direction and the second direction, and
a position of the second panel pixel is shifted by half a size of the panel pixel in the first direction and the second direction from the first panel pixel.

3. The projection type display apparatus according to claim 2 , wherein
the optical path shift element, in the first frame period, shifts a position of the projection pixel in one direction along the first axis from the first unit period to a second unit period, shifts the position of the projection pixel in one direction along the second axis from the second unit period to a third unit period, shifts the position of the projection pixel in the other direction along the first axis from the third unit period to a fourth unit period, and shifts the position of the projection pixel in the other direction along the second axis from the fourth unit period to the first unit period of the second frame period.

4. The projection type display apparatus according to claim 3 , wherein
as for the one frame period, a first frame period and a second frame period are consecutive.

5. The projection type display apparatus according to claim 4 , wherein
the display control circuit controls the optical path shift element so that a shift direction from the position of the projection pixel before the shift to the position of the projection pixel after the shift from the first unit period to the fourth unit period of the first frame period becomes a direction opposite to the shift direction from the position of the projection pixel before the shift to the position of the projection pixel after the shift from the first unit period to the fourth unit period of the second frame period.

6. The projection type display apparatus according to claim 1 , further comprising:
a third liquid crystal panel including a third panel pixel corresponding to third light, wherein
the third panel pixel overlaps with the first panel pixel when viewed in a projected image.

Assignees

• Seiko Epson Corp

Inventors

• Aoki Toru
• Mizusako Kazuhisa
• Komuro Yusuke

Classifications

• G09G3/36

  using liquid crystals · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• H04N9/3179

  Video signal processing therefor · CPC title

• H04N9/3188

  Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391) · CPC title

• H04N9/3141

  Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14) · CPC title