Projection type display device
View Patent ↗A projection type display device is provided to display high quality images. In the device, a WB-PBSW 2 is inclined to liquid crystal display devices 1 r , 1 b , 1 g and has wire grids 2 a parallel with a first substrate 11 . One of directions of projection lines obtained by projecting the wire grids 2 a on a second substrate 12 vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is defined as X-axis. If the liquid crystal display devices 1 r , 1 b , 1 g are a type of first twist (normal twist), device reference line vectors are located at 225°±10° in the counterclockwise direction in view from the first substrate 11 . In case of a second twist (reverse twist) type, the device reference line vectors are located at 315°±10° in the counterclockwise direction in view from the first substrate 11.
1. A projection type display device comprising:
a light source;
a reflection type liquid crystal display device allowing an incidence of an illumination light from the light source through a wire-grid type polarization beam splitter for polarizing the illumination light; and
an imaging lens system for providing an image from a modulated light which has been polarized, modulated and reflected by the reflection type liquid crystal display device and subsequently diverged from an optical path for the light source by the wire-grid type polarization beam splitter, wherein
the reflection type liquid crystal display device includes a first transparent substrate having a transparent electrode formed therein and allowing an incidence of the illumination light, a second substrate opposed parallel to the first substrate through a gap and having reflecting electrodes and drive circuits arranged in matrix for every pixel thereby to reflect the illumination light transmitted through the first substrate and emit the illumination light therethrough and a liquid crystal layer enclosed between the first substrate and the second substrate to polarize and modulate the illumination light transmitted through the first substrate and also composed of nematic liquid crystal whose dielectric anisotropy is negative,
the wire-grid type polarization beam splitter is arranged so as to have its polarization spectroscopic surface inclined to the first substrate of the reflection type liquid crystal display device, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surface and also arranged parallel to the first substrate,
the each of the reflection type liquid crystal display devices is either:
a first twist type liquid crystal display device where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the clockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the counterclockwise direction with respect to the predetermined reference line; or
a second twist type liquid crystal display device where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the counterclockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the clockwise direction with respect to the predetermined reference line,
the wire-grid type polarization beam splitters are arranged so as to have their polarization spectroscopic surfaces inclined to the first substrates of the reflection type liquid crystal display devices, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surfaces and also arranged parallel to the first substrates, and
assuming one of directions of projection lines obtained by projecting the wire grids on the second substrate vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is represented by X-axis,
the first twist type liquid crystal display device has its reference line's vector disposed within a range of 225°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate, and
the second twist type liquid crystal display device has its reference line's vector disposed within a range of 315°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate.
2. A projection type display device comprising:
illumination-light generating means for generating multicolor illumination lights containing different band components from each other;
reflection type liquid crystal display devices for respective colors allowing an incidence of the multicolor illumination lights from the illumination-light generating means through wire-grid type polarization beam splitters for polarizing the multicolor illumination lights respectively;
color synthesizing means for synthesizing modulated lights for respective colors, the modulated lights being produced since the illumination lights have been polarized, modulated and reflected by the reflection type liquid crystal display devices and successively diverged from an optical path for the illumination-light generating means by the wire-grid type polarization beam splitters; and
an imaging lens system for providing an image from the modulated lights transmitted through the color synthesizing means, wherein:
each of the reflection type liquid crystal display devices includes a first transparent substrate having a transparent electrode formed therein and allowing an incidence of one of the illumination lights, a second substrate opposed parallel to the first substrate through a gap and having reflecting electrodes and drive circuits arranged in matrix for every pixel thereby to reflect the illumination light transmitted through the first substrate and emit the illumination light therethrough and a liquid crystal layer enclosed between the first substrate and the second substrate to polarize and modulate the illumination light transmitted through the first substrate and also composed of nematic liquid crystal whose dielectric anisotropy is negative,
the each of the reflection type liquid crystal display devices is either:
a first twist type liquid crystal display device where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the clockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the counterclockwise direction with respect to the predetermined reference line; or
a second twist type liquid crystal display device where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the counterclockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the clockwise direction with respect to the predetermined reference line,
the wire-grid type polarization beam splitters are arranged so as to have their polarization spectroscopic surfaces inclined to the first substrates of the reflection type liquid crystal display devices, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surfaces and also arranged parallel to the first substrates, and
assuming, for each of the reflection type liquid crystal display devices, one of directions of projection lines obtained by projecting the wire grids on the second substrate vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is represented by X-axis,
the first twist type liquid crystal display device has its reference line's vector disposed within a range of 225°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate, and
the second twist type liquid crystal display device has its reference line's vector disposed within a range of 315°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate.
3. The projection type display device of claim 2 , wherein
the illumination-light generating means generates illumination lights corresponding to three primary colors of light respectively,
the color synthesizing means includes a first optical multilayer membrane for reflecting only a light in a first color of the three primary colors selectively and transmitting lights in second and third colors and a second optical multilayer membrane for reflecting only the light in the second color of the three primary colors selectively and transmitting the lights in the first and third colors, the first optical multilayer membrane intersecting with the second optical multilayer membrane perpendicularly,
the reflection type liquid crystal display devices comprise a first-color reflection type liquid crystal display device allowing an incidence of the illumination light in the first color, a second-color reflection type liquid crystal display device allowing an incidence of the illumination light in the second color a third-color reflection type liquid crystal display device allowing an incidence of the illumination light in the third color, all the reflection type liquid crystal display devices being the first twist type liquid crystal display devices, or the second twist type liquid crystal display devices,
the modulated light in the first color from the first-color reflection type liquid crystal display device is reflected by the first optical multilayer membrane of the color synthesizing means,
the modulated light in the second color from the second-color reflection type liquid crystal display device is reflected by the second optical multilayer membrane of the color synthesizing means, and
the modulated light in the third color from the third-color reflection type liquid crystal display device is transmitted through the first optical multilayer membrane and the second optical multilayer membrane of the color synthesizing means.
4. The projection type display device of claim 3 , wherein
the first color corresponds to red of the three primary colors,
the second color corresponds to blue of the three primary colors,
the third color corresponds to green of the three primary colors, and
the reflection type liquid crystal display devices comprise:
the second twist type liquid crystal display device allowing an incidence of the illumination light in red;
either the first twist type liquid crystal display device or the second twist type liquid crystal display device allowing an incidence of the illumination light in blue; and
the first twist type liquid crystal display device allowing an incidence of the illumination light in green.
5. The projection type display device of claim 3 , wherein
the first color corresponds to red of the three primary colors,
the second color corresponds to blue of the three primary colors,
the third color corresponds to green of the three primary colors, and
the reflection type liquid crystal display devices comprise:
the first twist type liquid crystal display device allowing an incidence of the illumination light in red;
either the first twist type liquid crystal display device or the second twist type liquid crystal display device allowing an incidence of the illumination light in blue; and
the second twist type liquid crystal display device allowing an incidence of the illumination light in green.
6. A projection type display device comprising:
illumination-light generating means for generating illumination lights corresponding to three primary colors of light respectively;
reflection type liquid crystal display devices for respective colors on which illumination lights in corresponding primary-color band components are incident after the illumination lights have been polarized by wire-grid type polarization beam splitters arranged corresponding to the illumination lights in red, blue and green;
color synthesizing means having a first optical multilayer membrane for reflecting only a light in red of the three primary colors selectively and transmitting lights in blue and green and a second optical multilayer membrane for reflecting only the light in blue of the three primary colors selectively and transmitting the lights in red and green, the first optical multilayer membrane intersecting with the second optical multilayer membrane perpendicularly, thereby to synthesize modulated lights for respective colors, the modulated lights being produced since the illumination lights have been polarized in modulation and reflected by the reflection type liquid crystal display devices and successively diverged from an optical path for the illumination-light generating means by the wire-grid type polarization beam splitters; and
an imaging lens system for providing an image from the modulated lights transmitted through the color synthesizing means, wherein:
each of the reflection type liquid crystal display devices includes a first transparent substrate having a transparent electrode formed therein and allowing an incidence of one of the illumination lights, a second substrate opposed parallel to the first substrate through a gap and having reflecting electrodes and drive circuits arranged in matrix for every pixel thereby to reflect the illumination light transmitted through the first substrate and emit the illumination light therethrough and a liquid crystal layer enclosed between the first substrate and the second substrate to polarize and modulate the illumination light transmitted through the first substrate and also composed of nematic liquid crystal whose dielectric anisotropy is negative,
the reflection type liquid crystal display devices comprises:
one first twist type liquid crystal display device for green where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the clockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the counterclockwise direction with respect to the predetermined reference line, the first twist type liquid crystal display device for green allowing an incidence of the illumination light in green; and
two second twist type liquid crystal display devices for red and blue where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the counterclockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the clockwise direction with respect to the predetermined reference line, the second twist type liquid crystal display devices for red and blue allowing an incidence of the illumination lights in red and blue respectively,
the wire-grid type polarization beam splitters for respective colors are arranged so as to have their polarization spectroscopic surfaces inclined to the first substrates of the reflection type liquid crystal display devices, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surfaces and also arranged parallel to the first substrates, and
assuming, for each of the reflection type liquid crystal display devices, one of directions of projection lines obtained by projecting the wire grids on the second substrate vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is represented by X-axis,
the one second twist type liquid crystal display device for red has its reference line's vector disposed within a range of 315°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate,
the other second twist type liquid crystal display device for blue its reference line's vector disposed within a range of 135°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate, and
the first twist type liquid crystal display device for green has its reference line's vector disposed within a range of 225°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate
the modulated light in red from the second twist type liquid crystal display devices for red is reflected by the first optical multilayer membrane of the color synthesizing means,
the modulated light in blue from the second twist type liquid crystal display device for blue is reflected by the second optical multilayer membrane of the color synthesizing means, and
the modulated light in green from the first twist type liquid crystal display device for green is transmitted through the first optical multilayer membrane and the second optical multilayer membrane of the color synthesizing means.
7. A projection type display device comprising:
illumination-light generating means for generating illumination lights corresponding to three primary colors of light respectively;
reflection type liquid crystal display devices for respective colors on which illumination lights in corresponding primary-color band components are incident after the illumination lights have been polarized by wire-grid type polarization beam splitters arranged corresponding to the illumination lights in red, blue and green;
color synthesizing means having a first optical multilayer membrane for reflecting only a light in red of the three primary colors selectively and transmitting lights in blue and green and a second optical multilayer membrane for reflecting only the light in blue of the three primary colors selectively and transmitting the lights in red and green, the first optical multilayer membrane intersecting with the second optical multilayer membrane perpendicularly, thereby to synthesize modulated lights for respective colors, the modulated lights being produced since the illumination lights have been polarized, modulated and reflected by the reflection type liquid crystal display devices and successively diverged from an optical path for the illumination-light generating means by the wire-grid type polarization beam splitters; and
an imaging lens system for providing an image from the modulated lights transmitted through the color synthesizing means, wherein:
each of the reflection type liquid crystal display devices includes a first transparent substrate having a transparent electrode formed therein and allowing an incidence of one of the illumination lights, a second substrate opposed parallel to the first substrate through a gap and having reflecting electrodes and drive circuits arranged in matrix for every pixel thereby to reflect the illumination light transmitted through the first substrate and emit the illumination light therethrough and a liquid crystal layer enclosed between the first substrate and the second substrate to polarize and modulate the illumination light transmitted through the first substrate and also composed of nematic liquid crystal whose dielectric anisotropy is negative,
the reflection type liquid crystal display devices comprises:
two first twist type liquid crystal display device for red and blue where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the clockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the counterclockwise direction with respect to the predetermined reference line, the first twist type liquid crystal display devices for red and blue allowing an incidence of the illumination lights in red and blue respectively; and
one second twist type liquid crystal display devices for green where, in view from the first substrate, liquid crystal molecules on the side of the second substrate are aligned in the counterclockwise direction with respect to a predetermined reference line and liquid crystal molecules on the side of the first substrate are aligned in the clockwise direction with respect to the predetermined reference line, the second twist type liquid crystal display device for green allowing an incidence of the illumination light in green,
the wire-grid type polarization beam splitters for respective colors are arranged so as to have their polarization spectroscopic surfaces inclined to the first substrates of the reflection type liquid crystal display devices, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surfaces and also arranged parallel to the first substrates, and
assuming, for each of the reflection type liquid crystal display devices, one of directions of projection lines obtained by projecting the wire grids on the second substrate vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is represented by X-axis,
the one first twist type liquid crystal display device for red has its reference line's vector disposed within a range of 225°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate,
the other first twist type liquid crystal display device for blue its reference line's vector disposed within a range of 45°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate, and
the second twist type liquid crystal display device for green has its reference line's vector disposed within a range of 315°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate
the modulated light in red from the first twist type liquid crystal display devices for red is reflected by the first optical multilayer membrane of the color synthesizing means,
the modulated light in blue from the first twist type liquid crystal display device for blue is reflected by the second optical multilayer membrane of the color synthesizing means, and
the modulated light in green from the second twist type liquid crystal display device for green is transmitted through the first optical multilayer membrane and the second optical multilayer membrane of the color synthesizing means.