US 7,746,294 B2 · Transflective liquid crystal display · patentgrep

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Abstract

The apparatus, methods, system and devices of the present invention provides transflective LCD system structure wherein each pixel is composed of at least three reflective sub-pixels and at least one transmissive sub-pixel. The reflective sub-pixels have a color filter layer for displaying color reflective images and the transmissive sub-pixel it is driven by color sequential imaging method for displaying a color transmissive image. The configuration of the sub-pixels and the location of the sub-pixel electronics increases the aperture ratio of both transmissive sub-pixel and reflective sub-pixel to improve the image brightness and lower the overall power consumption of the device.

Claims32

Dependent claims

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels, the at least one electronic circuit comprises:
plural first and second scan electrodes;
plural first and second data electrodes, wherein one of the plural first scan electrodes and one of the plural first data electrode connect each one of the at least three reflective sub-pixels to the at least one electronic circuit and one of the plural second scan electrodes and one of the plural second data electrodes connect each one of the transmissive sub-pixel to the at least one electronic circuit;
and
at least four pixel electronic circuits connected with the plural first and second scan electrodes and the plural first and second data electrodes for driving the at least three reflective sub-pixel and the transmissive sub-pixel, respectively, for each of the plural pixels, at least three of the pixel electronic circuits are each located in a region of a corresponding one of the at least three reflective sub-pixel and the transmissive sub-pixel, at least three of the at least four pixel electronic circuits are each located below the reflective layer of a corresponding one of the at least three reflective sub-pixels to increase an aperture ratio of the at least three reflective sub-pixel to provide brighter reflective image for the reflective modes;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images.

10 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels, the at least one electronic circuit comprises:
plural first and second scan electrodes;
plural first and second data electrodes, wherein one of the plural first scan electrodes and one of the plural first data electrode connect each one of the at least three reflective sub-pixels to the at least one electronic circuit and one of the plural second scan electrodes and one of the plural second data electrodes connect each one of the transmissive sub-pixel to the at least one electronic circuit;
and
at least four pixel electronic circuits connected with the plural first and second scan electrodes and the plural first and second data electrodes for driving the at least three reflective sub-pixel and the transmissive sub-pixel, respectively, for each of the plural pixels, wherein the at least four pixel electronic circuits are each located in a region of a corresponding one of the at least three reflective sub-pixel and the transmissive sub-pixel and one of the at least four pixel electronic circuits drives the transmissive sub-pixel and is located below the reflective layer of the at least three reflective sub-pixels to increase an aperture ratio of the transmissive sub-pixel to provide a brighter transmissive image for the transmissive mode;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images.

10 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels, the at least one electronic circuit comprises:
plural first and second scan electrodes;
plural first and second data electrodes, wherein one of the plural first scan electrodes and one of the plural first data electrode connect each one of the at least three reflective sub-pixels to the at least one electronic circuit and one of the plural second scan electrodes and one of the plural second data electrodes connect each one of the transmissive sub-pixel to the at least one electronic circuit;
a reflective pixel electronic circuit connected with the plural first scan and first data electrodes for driving each one of the at least three reflective sub-pixels;
and
a dual-switch based transmissive pixel electronic circuit connected with the plural second scan and second data electrodes for driving the transmissive sub-pixel;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images.

11 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images, wherein the timing control unit includes:
a reflective timing signal for scanning the reflective sub-pixels row-by-row once during each one of plural frame periods;
and
a transmissive timing signal for scanning the transmissive sub-pixels row-by-row for six sub-frames during each one of the plural frame periods, wherein a color sub-frame and a dark sub-frame are interleaved within the six sub-frames.

9 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images, wherein the timing control unit further comprises:
a reflective timing signal for scanning the reflective sub-pixels row-by-row once during each one of plural frame periods;
and
a transmissive timing signal for scanning the transmissive sub-pixels row-by-row for six sub-frames during each one of the plural frame periods.

9 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images, wherein the timing control unit further comprises:
a reflective timing signal for scanning the reflective sub-pixels row-by-row once during each one of plural frame periods;
and
a transmissive timing signal for scanning the transmissive sub-pixels row-by-row for six sub-frames during each one of the plural frame periods.

9 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels;
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images, wherein the timing control unit further comprises:
a reflective timing signal for scanning the reflective sub-pixels row-by-row once during each one of plural frame periods;
and
a transmissive timing signal for scanning the transmissive sub-pixels row-by-row for six sub-frames during each one of the plural frame periods.

9 more elements

A transflective liquid crystal display comprising:

a top and a bottom substrate having a liquid crystal layer sandwiched between the top and the bottom substrate;
plural pixels, each one of the plural pixels comprising:
at least three reflective sub-pixels for displaying a reflective image, wherein each one of the at least three reflective sub-pixels having a reflective layer on an inner surface of the bottom substrate to reflect an incident light back to a viewer;
and
a transmissive sub-pixel for displaying a transmissive image;
at least one electronic circuit for driving the at least three reflective sub-pixels and the transmissive sub-pixel of each one of the plural pixels
a backlight below the transmissive sub-pixels;
and
a timing control unit connected with the at least one electronic circuit for converting and distributing an incoming video data to the plural pixels and controlling the backlight to synchronize the reflective and transmissive display images, wherein the timing control unit further comprises:
a reflective timing signal for scanning the reflective sub-pixels row-by-row once during each one of plural frame periods;
and
a transmissive timing signal for scanning the transmissive sub-pixels row-by-row for six sub-frames during each one of the plural frame periods.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/404,539Filed 14 Apr 2006
Published: US 2007/0242014 A118 Oct 2007
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G02F 1/133514
Filters, e.g. light shielding masks: colour filters
G02F 1/133555
Reflecting elements: transflectors
G09G 3/3607
Using liquid crystals: for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
G09G 3/3648
Control of matrices with row and column drivers: using an active matrix

Family

US 2007/0242014 A1Pre-grant publication · published 18 Oct 2007
US 7,746,294 B2This patent

From the US filing history. Foreign family members aren’t listed.

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