Samsung Electronics Co., Ltd.

Daewoo Electronics Co., Ltd.

Zeen Information Technologies, Inc.

Dong-hee Lee

Sam-hyuk Noh

Yoo-kun Cho

Jong-Min Kim

Ji-Hyun In

Jong-moo Choi

Jae-yong Jeong

Bum-Soo Kim

Bum-soo Kim

Sang-Lyul Min

Je-Sung Kim

Ji-hyun In

Gui-Young Lee

Gui-Yong Lee

Sang-Iyul Min

Jae-Yong Jeong

Jong-min Kim

Song-Ho Yoon

Jesung Kim

Jun-Hyun Park

Jong-Yeol Park

Kyong-Ae Kim

Sung-Kwan Kim

Gui-young Lee

Je-sung Kim

Jong-Moo Choi

A flash memory management method is provided. According to the method, when a request to write the predetermined data to a page to which data has been written is made, the predetermined data is written to a log block corresponding to a data block containing the page. When a request to write the predetermined data to the page again is received, the predetermined data is written to an empty free page in the log block. Even if the same page is requested to be continuously written to, the management method allows this to be processed in one log block, thereby improving the effectiveness in the use of flash memory resources.

Flash memory management method

Method of writing to a flash memory including data blocks and log blocks

Method of writing of writing to a flash memory including data blocks and log blocks, using a logical address having a block address portion and page identifying portion, a block address table and a page table

A method for flash memory management where, if changing of data of a data block recorded in a data area is requested, recording the data block having changed data in an alternative area and recording mapping information representing an address of the data block recorded in the alternative area in a mapping area. If changing of data of the data block recorded in the alternative area is requested, recording a data block having changed data in the data area and deleting the mapping information representing the address recorded in the alternative area from the mapping area. If the mapping information on the data block exists in the mapping area, data is read from the data block in the alternative area, and if the mapping information on the data block does not exist in the mapping area, data is read from the data block at the original address in the data area.

Method for changing data of a data block in a flash memory having a mapping area, a data area and an alternative area

A memory card comprises a memory controller connected to a non-volatile memory module. The memory controller comprises a first circuit adapted to convert a first external address into a first internal address using a program stored in an internal memory. The memory controller further comprises a hardware accelerator adapted to generate a second internal address based on the first internal and external addresses.

Memory card providing hardware acceleration for read operations

Disclosed is a rear projection screen having improved contrast and brightness. A screen for receiving an incident projection beam from a projection lens from a rear side of the screen and for transmitting the received light toward an observer is comprised. A fresnel lens for collimating the projection beam is included. The fresnel lens is formed on one side of the screen, where the projection beam from the projection lens is incident. A light absorbing layer for absorbing an external light incident into the screen and for reflecting a light incident from the fresnel lens is comprised. Also comprised is a light dispersing layer for dispersing the projection beam incident from a rear side of the screen and the reflected light from the light absorbing layer. The light absorbing layer and the light dispersing layer are formed on an observer's side of the screen. The screen has a one sheet structure having a novel light dispersing system. The manufacture of the screen is advantageous and the image reproduced on the screen is good quality.

Rear projection screen

A projection system has three projecting lenses that are controlled integrally. A holder having an upper plate and a lower plate is provided. A plurality of longitudinally slanted guiding holes are formed at the left and right portions of the upper and lower plate. First, second and third projecting lens holders having cylindrical shapes are provided in the holder housing. Projecting lenses are provided at the front sides of the holders. Movable pins are protrusively formed at the upper and lower portions of the first and third projecting lens holders and are inserted into corresponding longitudinally slanted guiding holes. A holder supporting plate has a first and second holder brackets for supporting the second projecting lens holder, and four leg portions and guiding grooves formed at the leg portions for inserting the movable pins. A driving motor and a transporting apparatus are provided. The image control is advantageous and the keystoning phenomenon is eliminated.

Projection system

Disclosed is a three dimensional projection system. A holder housing has upper and lower plates and a plurality of longitudinally inclined guiding holes inclined at predetermined angles about central axes of the upper and lower plates. First and second projecting lens holders have cylindrical shapes and are provided with projecting lenses in front sides thereof. Movable pins protrusively formed on upper and lower portions of the first and second projecting lens holders are provided. The movable pins are respectively inserted into corresponding longitudinally inclined guiding holes. A holder supporting plate has a pair of front and rear plates and a spacer. The front and rear plates are provided with first and second leg portions formed at both sides thereof and extended onto an upper portion of the upper plate, and third and fourth leg portions extended onto a lower portion of the lower plate. A driving motor for supplying driving power for transporting the projecting lens holders is provided. And transporting apparatus for transporting the driving power to the projecting lens holders is provided. The operation of the system is advantageous and the keystoning phenomenon is eliminated.

Three dimensional projection system

The projection-lens driving apparatus having a housing with a top and a bottom faces for use in a 3-beam projector includes an upper plate, an upper projection-lens holder, a pair of cross link, a pair of lower projection-lens holders, a guide bracket, a sliding plate, an upper guide member, a lower guide member, a timing belt, a driving means divided into a first driving means for driving the upper guide member and a second driving means for driving the lower guide member. The upper and the lower projection-lens holders is respectively fitted to the upper and the lower guide members mechanically and physically in such a way that they can be driven integrally using the driving means, thereby allowing the images to coincide on the screen accurately and, above all, simultaneously.

Projection-lens driving apparatus with a timing belt

Growing community of inventors

Seoul, South Korea

Dong-hee Lee