US-12620330-B2 - Projection display device

US12620330B2US 12620330 B2US12620330 B2US 12620330B2US-12620330-B2

Abstract

A projection display device including a first panel that generates a first image, a second panel that generates a second image, a prism that combines the first image with the second image shifted in a horizontal direction with respect to a first pixel and outputs a combination image, a light path shift element, and a display control circuit. The display control circuit supplies data signals of odd-numbered rows to the first panel and supplies data signals of even-numbered rows to the second panel in an odd-numbered field period, and supplies data signals of even-numbered rows to the first panel and supplies data signals of even-numbered rows to the second panel in an even-numbered field period, and controls the light path shift element so that a light path of the combination image is shifted in a vertical direction.

Inventors

Kazuhisa Mizusako

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20241030
Priority Date: 20231031

Claims (8)

1 . A projection display device comprising: a first image light emission device configured to emit first image light; a second image light emission device configured to emit second image light; an optical combination system configured to combine the first image light with the second image light in a state in which the second image light is shifted in a first direction relative to the first image light, and emit combination light, a light path shift element configured to shift a light path for the combination light emitted from the optical combination system; and a display control circuit configured to control the first image light emission device, the second image light emission device, and the light path shift element, wherein one frame period includes a first field period and a second field period, the display control circuit supplies a data signal of a video pixel aligned in the first direction at an odd-numbered position in a second direction intersecting the first direction in video pixel data among data signals corresponding to gradation levels designated by the video pixel data arranged in a matrix to the first image light emission device, supplies a data signal of the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data to the second image light emission device, and controls the light path shift element so that the light path is set as a reference position in the first field period, and supplies a data signal of the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data to the first image light emission device, supplies a data signal of the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data to the second image light emission device, and controls the light path shift element so that the light path is shifted in the second direction intersecting the first direction in the second field period, and the first image light emission device emits the first image light based on the supplied data signal, and the second image light emission device emits the second image light based on the supplied data signal.
2 . The projection display device according to claim 1 , wherein in the optical combination system, an amount of shift of the second image light in the first direction relative to the first image light is 0.5 pixels of the pixel in the first image light or the second image light, and an amount of shift of the light path in the light path shift element is 0.5 pixels.
3 . The projection display device according to claim 2 , wherein the first image light emission device includes a first liquid crystal panel, a first light source configured to emit light toward the first liquid crystal panel, and a first polarization conversion member configured to convert the light emitted by the first light source into first polarized light, the first polarized light is incident on the first liquid crystal panel, the second image light emission device includes a second liquid crystal panel, a second light source configured to emit light toward the second liquid crystal panel, and a second polarization conversion member configured to convert the light emitted by the second light source into second polarized light, and the second polarized light is incident on the second liquid crystal panel.
4 . The projection display device according to claim 3 , wherein each of the first light source and the second light source is a laser light source that emits first light including a wavelength range of red, second light including a wavelength range of green, and third light including a wavelength range of blue.
5 . The projection display device according to claim 3 , wherein the first liquid crystal panel in the first image light emission device generates images of light components of a first color, a second color, and a third color in positive polarity writing and negative polarity writing, and the second liquid crystal panel in the second image light emission device generates the images of the light components of the first color, the second color, and the third color in positive polarity writing and negative polarity writing.
6 . The projection display device according to claim 5 , wherein when the first liquid crystal panel generates image light of the light component of the first color, the second liquid crystal panel generates image light of the light component of the second color, and when the first liquid crystal panel generates the image light of the light component of the second color, the second liquid crystal panel generates the image light of the light component of the first color.
7 . The projection display device according to claim 3 , wherein in the first field period and the second field period, the first image light emission device generates a light component of a first color, a light component of a second color, and a light component of a third color having different wavelengths in the first image light in a time-division manner, and the second image light emission device generates a light component of the first color, a light component of the second color, and a light component of the third color in the second image light in a time-division manner.
8 . The projection display device according to claim 2 , wherein the first image light emission device includes a first self-emitting panel including sub-pixels corresponding to a first color, a second color, and a third color having different wavelengths, and configured to emit the first image light; and a first polarization conversion member configured to convert the light emitted from the first self-emitting panel into the first polarized light, and the second image light emission device includes a second self-emitting panel including sub-pixels of the first color, the second color, and the third color, and configured to emit the second image light; and a second polarization conversion member configured to convert the light emitted from the second self-emitting panel into the second polarized light.

Description

The present application is based on, and claims priority from JP Application Serial Number 2023-186636, filed Oct. 31, 2023, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a projection display device. 2. Related Art In a projection display device that projects image light created by a liquid crystal panel or the like onto a screen or the like, a technology for shifting a first optical image generated by a first optical system and a second optical image generated by a second optical system, combining the optical images, and projecting a resultant image to achieve high resolution has been proposed (see, for example, JP-A-2010-181670). Specifically, when color display is realized in the technology, the following configuration is used. That is, images from three liquid crystal panels are combined by a first dichroic prism so that a first optical image is obtained in the first optical system, images from three liquid crystal panels are combined by a second dichroic prism so that a second optical image is obtained in the second optical system, and the first optical image and the second optical image are combined by a prism. However, in the technology, not only a total of six liquid crystal panels, but also three prisms for combining the optical images are required. To this end, the technology has a problem in that not only a configuration becomes more complex, but costs also increase to realize a high-resolution color display. SUMMARY In order to solve the problems, a projection display device according to an aspect of the present disclosure includes a first image light emission device configured to emit first image light, a second image light emission device configured to emit second image light, an optical combination system configured to combine the first image light with the second image light in a state in which the second image light is shifted in a first direction relative to the first image light, and emit combination light, a light path shift element configured to shift a light path for the combination light emitted from the optical combination system, and a display control circuit configured to control the first image light emission device, the second image light emission device, and the light path shift element, wherein one frame period includes a first field period and a second field period, the display control circuit supplies a data signal of a video pixel aligned in the first direction at an odd-numbered position in a second direction intersecting the first direction in video pixel data among data signals corresponding to gradation levels designated by the video pixel data arranged in a matrix to the first image light emission device, supplies a data signal of the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data to the second image light emission device, and controls the light path shift element so that the light path is set as a reference position in the first field period, and supplies a data signal of the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data to the first image light emission device, supplies a data signal of the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data to the second image light emission device, and controls the light path shift element so that the light path is shifted in the second direction intersecting the first direction in the second field period, and the first image light emission device emits the first image light based on the supplied data signal, and the second image light emission device emits the second image light based on the supplied data signal. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a projection display device according to a first embodiment. FIG. 2 is a block diagram illustrating a configuration of the projection display device. FIG. 3 is a diagram illustrating an arrangement of video pixels in the projection display device. FIG. 4 is a diagram illustrating disposition of panel pixels in the projection display device. FIG. 5 is a perspective view illustrating a configuration of a liquid crystal panel in the projection display device. FIG. 6 is a cross-sectional view illustrating the structure of the liquid crystal panel. FIG. 7 is a block diagram illustrating an electrical configuration of the liquid crystal panel. FIG. 8 is a diagram illustrating a configuration of a pixel circuit in a liquid crystal panel. FIG. 9 is a diagram illustrating an operation in a one-frame period of a projection display device. FIG. 10 is a diagram illustrating a writing operation in a liquid crystal panel. FIG. 11 is a diagram illustrating a relationship between video pixels, panel pixels, and projection positions in a one-frame period. FIG. 12