Liquid crystal on silicon display with brightness adjustment

Patent metadata

Field	Value
Publication number	US-10019952-B2
Application number	US-201615210908-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 15, 2016
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The liquid crystal on silicon (LCoS) display includes a polarization beam splitter (PBS), a light source, a LCoS panel and a gain control circuit. The PBS has a first side and a second side. The light source is disposed at the first side of the PBS. The gain control circuit receives brightness values. Each of the brightness values has a coordinate which is based on a coordinate axis extending from the first side of the PBS to the second side. The coordinate of a first brightness value is less than the coordinate of a second brightness value. The gain control circuit determines gains according to the coordinates, and adjusting the brightness values according to the gains, in which the gain of the first brightness value is less than the gain of the second brightness value.

First claim

What is claimed is:

1. A liquid crystal on silicon display, comprising:
a polarization beam splitter, having a first side and a second side disposed opposite to the first side;
a light source, disposed at the first side of the polarization beam splitter;
a liquid crystal on silicon panel, disposed at a third side of the polarization beam splitter; and
a gain control circuit, coupled to the liquid crystal on silicon panel and receiving a plurality of brightness values, wherein each of the brightness values has a coordinate which is based on a coordinate axis extending from the first side of the polarization beam splitter to the second side of the polarization beam splitter, the brightness values comprise a first brightness value and a second brightness value, the first brightness value and the second brightness value belong to a same color, the coordinate of the first brightness value is less than the coordinate of the second brightness value,
wherein the gain control circuit determines a plurality of gains according to the coordinates, and adjusts the brightness values according to the gains, wherein the gain of the first brightness value is less than the gain of the second brightness value,
wherein after adjusting the brightness values, the gain control circuit transmits the brightness values to the liquid crystal on silicon panel,
wherein the gain control circuit performs the operation of adjusting the brightness values based on following equations (1), (2) and (3):

R
C

⁡

(
x
)

=

(

1
-

(

1
-

R
G

)

×

H
-
x

H

)

×

R
i

⁡

(
x
)

(
1
)

G
C

⁡

(
x
)

=

(

1
-

(

1
-

G
G

)

×

H
-
x

H

)

×

G
i

⁡

(
x
)

(
2
)

B
C

⁡

(
x
)

=

(

1
-

(

1
-

B
G

)

×

H
-
x

H

)

×

B
i

⁡

(
x
)

(
3
)

wherein x denotes the coordinate, R i (x) denotes a red brightness value having the coordinate x, G i (x) denotes a green brightness value having the coordinate x, B i (x) denotes a blue brightness value having the coordinate x, H is a real number, R G , G G , B G are real numbers ranged between 0 to 1, R C (x) denotes the adjusted red brightness value, G C (x) denotes the adjusted green brightness value, and B C (x) denotes the adjusted blue brightness value.

2.

Assignees

• Himax Display Inc

Inventors

• Li Kuo-Jung
• Chung Mao-Jung

Classifications

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G02F1/136277

  formed on a semiconductor substrate, e.g. of silicon · CPC title

• G02F1/133528

  Polarisers · CPC title