Method and apparatus to correct lateral color shift in multi-panel projection systems
A three panel LC projection apparatus 10 having a plurality of LC panels 20 wherein one of the LC panels 20 has a projected image 16 reversed in relation to the remainder of the LC panels 20 . In one of either a red panel 20 a , a green panel 20 b or a blue panel 20 c either a glass buff layer direction 64 a or a silicon buff layer direction 64 b, 64 c is rotatated in a direction opposite to that of the remainder of the LC panels 20 . A twist direction of the liquid crystal 44 in that one of the LC panels 20 is correspondingly altered.
1 . A video display apparatus, comprising:
a first display panel, a second display panel and a third display panel; wherein:
the first display panel has an aspect which is generally the mirror image of the similar aspect of the second display panel and the third display panel.
2 . The video display apparatus of claim 1 , wherein:
the aspect is the relative buff direction of a buff layer.
3 . The video display apparatus of claim 2 , wherein:
the buff layer is a silicon buff layer.
4 . The video display apparatus of claim 2 , wherein:
the buff layer is a glass buff layer.
5 . The video display apparatus of claim 2 , wherein:
the buff layer is a layer of material overlying a silicon layer.
6 . The video display apparatus of claim 2 , wherein:
the buff layer is a layer of material overlying a glass layer.
7 . The video display apparatus of claim 2 , wherein:
the buff layer is a polyimide layer overlying a silicon layer.
8 . The video display apparatus of claim 2 , wherein:
the buff layer is a polyimide layer overlying a glass layer.
9 . The video display apparatus of claim 1 , wherein:
the first display panel is a green display panel.
10 . The video display apparatus of claim 1 , wherein:
the video display apparatus is a three panel projection display apparatus.
11 . The video display apparatus of claim 1 , wherein:
each of the first display panel, the second display panel and the third display panel is a liquid crystal display.
12 . The video display apparatus of claim 1 , wherein:
each of the first display panel, the second display panel and the third display panel is a reflective liquid crystal display.
13 . The video display apparatus of claim 1 , wherein:
the video display apparatus is a non-telecentric projection system.
14 . The video display apparatus of claim 1 , wherein:
the aspect is the relative twist direction of a liquid crystal material layer.
15 . A set of liquid crystal panels for a video projection system, comprising:
a first panel having a fist relative buff direction;
a second panel having the first relative buff direction; and
a third panel having a second relative buff direction.
16 . The set of claim 15 , wherein:
the second relative buff direction is generally a mirror image direction as compared to the first relative buff direction.
17 . The set of claim 15 , wherein:
the second relative buff direction is offset from a reference buff direction by an amount equal to but opposite an offset of the first relative buff direction.
18 . A set of liquid crystal panels for a video projection system, comprising:
a first panel having a first relative liquid crystal twist direction;
a second panel having the first relative liquid crystal twist direction; and
a third panel having a second relative liquid crystal twist direction.
19 . The set of claim 18 , wherein:
the second relative liquid crystal twist direction is generally a mirror image direction as compared to the first relative liquid crystal twist direction.
20 . The set of claim 18 , wherein:
the second relative liquid crystal twist direction is offset from a reference liquid crystal twist direction by an amount equal to but opposite an offset of the first relative liquid crystal twist direction.
21 . A method for producing a multi-panel display apparatus, comprising:
buffing a first panel buff layer in a first direction;
buffing a second panel buff layer in the first direction; and
buffing a third panel buff layer in a second direction.
22 . The method of claim 21 , wherein:
the first panel buff layer, the second panel buff layer, and the third panel buff layer are each buff layers overlaying a silicon layer in, respectively, a first panel, a second panel, and a third panel.
23 . The method of claim 22 , and further including:
providing a liquid crystal in the first panel having a first twist direction;
providing a liquid crystal in the second panel having the first twist direction; and
providing a liquid crystal in the third panel having a second twist direction.
24 . The method of claim 22 , and further including:
assembling the fist panel, the second pane, and the third panel such that a first image from the first panel, a second image from the second panel, and a third image from the third panel converge to create a combined image.
25 . The method of claim 21 , wherein:
the third panel buff layer is a layer in a green display panel.
26 . A liquid crystal panel comprising:
a buff layer;
a liquid crystal layer; and
indicia of a buff direction associated with said buff layer.
27 . A liquid crystal panel according to claim 26 , further comprising indicia of a twist direction associated with said liquid crystal layer.
28 . A liquid crystal panel according to claim 26 , wherein said indicia of said buff direction is included in a part number associated with said panel.