Projection-type display apparatus

Patent metadata

Field	Value
Publication number	US-12198587-B2
Application number	US-202318239926-A
Country	US
Kind code	B2
Filing date	Aug 30, 2023
Priority date	Aug 31, 2022
Publication date	Jan 14, 2025
Grant date	Jan 14, 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 a unit period f 1 - 1 and a unit period f 2 - 1 period, and controls the optical path shifting element to cause the position of the projected pixel in each of a unit period f 1 - 2 to a unit period f 1 - 4 , to be different from the position of the projected pixel in a respective one of 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 a second unit period and through an n-th unit period, in a time sequence, included in one frame period, n being an integer of two or greater, the first unit period being an initial first unit period at a beginning of the time sequence of the frame period, the second unit period through the n-th unit period being subsequent to the initial first unit period in the time sequence; 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 the initial first unit period of the n unit periods in a first frame period and the 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 the position of the projected pixel in each of the second unit period to the n-th unit period of the first frame period, to be different from the position of the projected pixel in a respective one of the second unit period to the n-th unit period of the second frame period.

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 the third unit period of the first frame period,
in the other direction along the first axis from the third unit period to the 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
an array of the pixel data corresponding to the first unit period to the n-th unit period of the first frame period, and an array of the pixel data corresponding to the first unit period to the n-th unit period of the second frame period have a rotational symmetry relationship about the pixel data corresponding to the first unit period of the first frame period and the first unit period of the second frame period.

Assignees

• Seiko Epson Corp

Inventors

• Aoki Toru
• Hosaka Hiroyuki
• Komuro Yusuke

Classifications

• G09G3/002 Primary

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

• G09G2340/0407

  Resolution change, inclusive of the use of different resolutions for different screen areas · CPC title

• G09G3/007 Primary

  Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels · CPC title