Projection-type display apparatus

Patent metadata

Field	Value
Publication number	US-12211409-B2
Application number	US-202318239937-A
Country	US
Kind code	B2
Filing date	Aug 30, 2023
Priority date	Aug 31, 2022
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

A projection-type display apparatus includes a liquid crystal panel including a panel pixel, an optical path shifting element that shifts a projected pixel projected from the panel pixel, and a display control circuit that controls the liquid crystal panel and the optical path shifting element. The display control circuit supplies, to the liquid crystal panel, the same data signal and controls the projected pixel to be at a same position in each of a unit period f 1 - 1 and a unit period f 2 - 1 , and controls the optical path shifting element to cause a shift direction from the projected pixel before the shift toward the projected pixel after the shift from a unit period f 1 - 2 to a unit period f 1 - 4 to be opposite to the shift direction from the projected pixel before the shift toward the projected pixel after the shift from a unit period f 2 - 2 to a unit period f 2 - 4.

First claim

What is claimed is:

1. A projection-type display apparatus comprising:
a liquid crystal panel including a panel pixel;
an optical path shifting element configured to shift a position of a projected pixel projected from the panel pixel in each of n unit periods from a first unit period to an n-th unit period included in one frame period, n being an integer of two or greater; and
a display control circuit configured to control the liquid crystal panel and the optical path shifting element, wherein
the display control circuit:
supplies a data signal corresponding to pixel data constituting video data, to the panel pixel in each of the unit periods,
controls the shift of the position of the projected pixel with respect to the optical path shifting element in each of the unit periods,
supplies, to the liquid crystal panel, the data signal corresponding to the same pixel data and controls the position of the projected pixel to be at a same position in each of an initial first unit period of the n unit periods in a first frame period and an initial first unit period of the n unit periods in a second frame period subsequent to the first frame period, and
controls the optical path shifting element to cause a shift direction from the position of the projected pixel before the shift to the position of the projected pixel after the shift from a second unit period to the n-th unit period of the first frame period to be opposite to the shift direction from the position of the projected pixel before the shift to the position of the projected pixel after the shift from the second unit period to the n-th unit period of the second frame period, and cause the position of the projected pixel to shift by half of the panel pixel in a direction opposite to the shift direction.

2. The projection-type display apparatus according to claim 1 , wherein
the pixel data constituting the video data is arrayed along a first axis and a second axis, and
the optical path shifting element shifts the projected pixel in a direction along the first axis or a direction along the second axis in each of the unit periods.

3. The projection-type display apparatus according to claim 2 , wherein
n is 4, and
the optical path shifting element shifts the position of the projected pixel:
in one direction along the first axis from the first unit period to the second unit period of the first frame period,
in one direction along the second axis from the second unit period to a third unit period of the first frame period,
in the other direction along the first axis from the third unit period to a fourth unit period of the first frame period, and
in the other direction along the second axis from the fourth unit period of the first frame period to the first unit period of the second frame period.

4. The projection-type display apparatus according to claim 1 , wherein
the pixel data constituting the video data is arrayed along a first axis and a second axis, and
in each of the unit periods, the optical path shifting element shifts the position of the projected pixel in a direction along the first axis, a direction along a third axis intersecting the first axis and the second axis, or a direction along a fourth axis intersecting the first axis, the second axis, and the third axis.

5. The projection-type display apparatus according to claim 4 , wherein
n is 4, and
the optical path shifting element shifts the position of the projected pixel:
in one direction along the third axis from the first unit period to the second unit period of the first frame period,
in one direction along the first axis from the second unit period to a third unit period of the first frame period,
in one direction along the fourth axis from the third unit period to a fourth unit period of the first frame period, and
in one direction along the first axis from the fourth unit period of the first frame period to the first unit period of the second frame period.

Assignees

• Seiko Epson Corp

Inventors

• Aoki Toru
• Hosaka Hiroyuki
• Komuro Yusuke

Classifications

• G09G3/36

  using liquid crystals · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2340/0457

  Improvement of perceived resolution by subpixel rendering · CPC title

• G09G3/002

  to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT · CPC title

• G03B21/006

  using LCD's · CPC title