Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Daizaburo Matsuki

Tomoko Iiyama

Syunsuke Kimura

Motonobu Yoshikawa

Yoshiharu Yamamoto

Hiroshi Yamaguchi

Katsuhiko Hayashi

Kenji Hasegawa

Takashi Yamada

Hajime Yamamoto

Masanori Yoshikawa

Akinobu Okuda

Yoshito Tanaka

Yoshinori Okazaki

Michihiro Yamagata

Yasuhiro Tanaka

Masahiro Kasano

Masaru Fujita

Yoshiaki Iwata

Kouki Ichihashi

Yoshifumi Kawaguchi

Toshihiko Shibita

The video display system includes a plurality of display devices having mutually different display delay times and a video conversion device that divides an input integrated video signal into a plurality of video signals and respectively outputs the plurality of video signals to the plurality of display devices. At least one of the plurality of video signals is output in a delayed state to make a difference between display timings of the plurality of videos respectively displayed on the plurality of display devices substantially zero, based on the display delay times.

Video display system, video conversion device, and video display method

An image display system causes a plurality of image display devices having different device characteristics to respectively display images. The image display system includes an external light detection device that detects external light and an image adjustment device that performs adjustment to make at least one of contrast, chromaticity, and luminance continuous between the images displayed on the plurality of image display devices, the adjustment being performed based on the device characteristics and the detected external light.

Image display system and image display method

A video display system () includes a display device () displaying a display video image containing a transmitted background and a video image indicated by a video signal, and a video processing device () converting, based on a characteristic related to the transmitted background, the video image indicated by the video signal to be transmitted to the display device ().

Video display system

A transparent screen is a transparent screen for diffusing image light projected from a projector and displaying an image by transmitting part of incident light rectilinearly and diffusing the other part of the incident light. The transparent screen includes a first base material that is transparent, a diffusion member, a second base material that is transparent, and a plurality of light absorption materials. The diffusion member is disposed within a first base material and diffuses the image light. The second base material is disposed on an opposite side of the first base material from the projector. The plurality of light absorption materials is disposed within the second base material and is arranged parallel to each other along an arrangement direction parallel to a principal plane of the second base material.

Transparent screen and image display system

Provided is a backlight device having: a light source element having LEDs and a lens expanding light from the LEDs; a housing containing the light source element; a diffuser plate covering an opening portion of the housing; and a reflection sheet reflecting light emitted from the light source element, toward the diffuser plate. The LEDs are arranged in one or more rows, at a central zone. The lens has an incident surface receiving light from the LEDs, and an exit surface from which the light goes out, being expanded. The reflection sheet is configured such that the angle between the optical axis of the lens of the light source element, and a line connecting a light emitting surface of each LED of the light source element and an end portion of the backlight device on the long side thereof is within a range of 60&#xb0;&#x2266;&#x3b8;m&#x2266;80&#xb0;.

Backlight device and liquid crystal display apparatus

Provided is a backlight device having: a light source element having LEDs and a lens expanding light from the LEDs; a housing containing the element; a diffuser plate covering an opening portion of the housing; and a reflection sheet reflecting light emitted from the element, toward the diffuser plate. The LEDs are arranged in one or more rows, at a central zone. The lens has an incident surface receiving light from the LEDs, and an exit surface from which the light goes out, being expanded. In the exit surface, in an optical-axis-containing sectional plane viewed laterally along the orientation in which the LEDs are arrayed, the len's curvature C in a minute interval along the exit surface is maximum in a range 60&#xb0;&#x3c;&#x3b8;&#x3c;80&#xb0;, where &#x3b8;is the angle between the optical axis, and a line connecting the center of the minute interval and the position of a light source on the optical axis.

Backlight device, liquid crystal display apparatus, and lens

A light emitting device including a lens in which light radiated from a light source with a wide angle can effectively be oriented while a directional characteristic of the light source is expanded is provided, and a surface light source including the light emitting devices and a liquid crystal display device are provided. The surface light source is configured such that the plural light emitting devices are disposed in a central portion thereof. The light emitting device radiates the light on an optical axis A and around the optical axis A. The light emitting device includes a light source and a lens that radially expands the light from the light source. The lens includes a reflection unit at a bottom surface of the lens partially.

Surface light source and liquid crystal display device

A light emitting device () is configured to radiate light with an optical axis A at the center, and is provided with a light source (), and a lens () that radially expands the light from light source (). The light source () has a light emitting surface () extending in an X direction orthogonal to the optical axis A. The lens () is configured to have a greater refractive power in a Y direction orthogonal to the X direction than in the X direction. For example, the lens () has a light entrance surface () including an anamorphic curved surface with different curve forms between the X direction and the Y direction.

Light emitting device, surface light source, and liquid crystal display apparatus

Provided is a backlight device having: a light source element having light emitting diodes and a lens expanding light from the light emitting diodes; a housing containing the light source element; a diffuser plate covering an opening portion of the housing; and a reflection sheet reflecting light emitted from the light source element, toward the diffuser plate. In the light source element, a plurality of the lenses are arranged at a central zone, the plurality of lenses being arranged in a plurality of rows.

An illuminating lens () includes a light entrance surface (), a light exit surface (), and a bottom surface (). The light entrance surface () has a first light entrance surface () and a second light entrance surface (). The first light entrance surface () is a curved surface convex toward the light exit surface () and perpendicularly intersecting an optical axis A, and the second light entrance surface () extends outwardly from an edge of the first light entrance surface () and is connected obliquely to an inner edge of the bottom surface (). In a cross section in a light spreading direction, &#x3b8;1 has a negative value at the first light entrance surface () and a positive value at the second light entrance surface (), where &#x3b8;1 is a refraction angle at which virtual light reaching the light entrance surface () directly from a starting point Q on the optical axis A corresponding to a position of a light source () passes through the light entrance surface (), and &#x3b8;1 is defined as negative when &#x3b8;1 is on the side of the optical axis A with respect to a normal N to the light entrance surface () and as positive when &#x3b8;1 is on the opposite side.

Illuminating lens, lighting device, surface light source, and liquid crystal display apparatus

The present invention relates to a surface light source, including a light source section made up of plural light emitting diodes and lenses that expand light from these light emitting diodes. The lens in the light source section has a light incident surface on which light from the light emitting diode is incident with an optical axis at a center, and a light exit surface that expands and emits the incident light. The light incident surface has a continued depressed surface, while the light exit surface has a continued projected surface. The lens performs such that 'sag Y' decreases from a maximum value 'sag Y' with an increment of &#x201c;&#x3b8;i&#x201d;, where &#x3b8;i is an angle included between a straight line, connecting an arbitrary point on the light exit surface and a base point on the optical axis which corresponds to a position of the light emitting diode, and the optical axis; sag Y is a distance measured in a light axis direction from the base point on the optical axis to the arbitrary point on the light exit surface; and &#x201c;sag Y&#x201d; is a value of sag Y when angle &#x3b8;i is 0 (zero) degree, and wherein the light exit surface except a vicinity of the optical axis takes a shape satisfying a relation of 10 degrees&#x3c;&#x3b8;min&#x3c;30 degrees, where &#x3b8;i takes a minimum value, i.e. &#x3b8;min when curvature C of a micro-section on the light exit surface in a sectional view which includes the optical axis takes a minimum value.

Surface light source device, liquid crystal display device, and lens

A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface is provided with a projecting portion or a recessed portion for reflecting light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the bottom surface.

Illuminating lens, lighting device, surface light source, and liquid-crystal display apparatus

An illuminating lens includes a main body and a ring portion. The main body has a light exit surface, and the light exit surface has a first light exit surface recessed toward a point on the optical axis and a second light exit surface extending outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region in the center thereof, and a total reflection region on the peripheral side thereof. The ring portion has a back surface configured to guide the light that has been emitted from a light source, totally reflected repeatedly at the light exit surface, and then entered the ring portion to an end surface by total reflection.

A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A reflective layer is formed on a bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface. The reflective layer reflects light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the bottom surface.

An illuminating lens has a light entrance surface and a light exit surface. The light exit surface has a first light exit surface recessed toward a point on an optical axis A and a second light exit surface extending outwardly from the periphery of the first light exit surface. The first light exit surface includes a transmissive region located in the center of the first light exit surface and a total reflection region located around the transmissive region. The transmissive region transmits light that has been emitted from a starting point Q, which is the position of a light source on the optical axis A, at a relatively small angle with respect to the optical axis A. The total reflection region totally reflects light that has been emitted from the starting point Q at a relatively large angle with respect to the optical axis A.

Growing community of inventors

Osaka, Japan

Daizaburo Matsuki