IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0144828
(2001-10-25)
|
우선권정보 |
EP-0203718 (2000-10-25) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Lumileds Lighting U.S., LLC
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
141 인용 특허 :
4 |
초록
▼
A backlight system comprises a light-emitting panel (1) having a front wall (2) and, opposite thereto, a rear wall (3), and opposite first and second light-transmitting edge surfaces (4; 5) associated with a plurality of first and second light sources (6; 7). Light originating from the light sources
A backlight system comprises a light-emitting panel (1) having a front wall (2) and, opposite thereto, a rear wall (3), and opposite first and second light-transmitting edge surfaces (4; 5) associated with a plurality of first and second light sources (6; 7). Light originating from the light sources (6; 7) is diffused in the panel (1). Parts of the surface areas (8; 9) of the rear wall (3) are provided with extraction means (18, 18', . . . ; 19, 19', . . . ) for extracting light from the panel (1). First extraction means (18, 18', . . . ) extract light from, preferably, the first light source (6), and vice versa In operation, said parts of the surface areas (8; 9) project light on a (LCD) display device panel (34) with an associated color filter (35). In the vicinity of the second edge area (5), the concentration of the first extraction means (18, 18', . . . ) is higher than that of the second extraction means (19, 19', . . . ), and vice versa. Preferably, the extraction means (18, 18', . . . , 19, 19', . . . ) are wedge-shaped, a side surface of the first extraction means (18, 18', . . . ) directed towards the second light source (7) extending parallel to the second edge surface (5), and vice versa. Preferably, the light sources (6; 7) comprise a plurality of blue, green, (amber) and red LEDs, each preferably having a luminous flux of at least 5 lumen.
대표청구항
▼
A backlight system comprises a light-emitting panel (1) having a front wall (2) and, opposite thereto, a rear wall (3), and opposite first and second light-transmitting edge surfaces (4; 5) associated with a plurality of first and second light sources (6; 7). Light originating from the light sources
A backlight system comprises a light-emitting panel (1) having a front wall (2) and, opposite thereto, a rear wall (3), and opposite first and second light-transmitting edge surfaces (4; 5) associated with a plurality of first and second light sources (6; 7). Light originating from the light sources (6; 7) is diffused in the panel (1). Parts of the surface areas (8; 9) of the rear wall (3) are provided with extraction means (18, 18', . . . ; 19, 19', . . . ) for extracting light from the panel (1). First extraction means (18, 18', . . . ) extract light from, preferably, the first light source (6), and vice versa In operation, said parts of the surface areas (8; 9) project light on a (LCD) display device panel (34) with an associated color filter (35). In the vicinity of the second edge area (5), the concentration of the first extraction means (18, 18', . . . ) is higher than that of the second extraction means (19, 19', . . . ), and vice versa. Preferably, the extraction means (18, 18', . . . , 19, 19', . . . ) are wedge-shaped, a side surface of the first extraction means (18, 18', . . . ) directed towards the second light source (7) extending parallel to the second edge surface (5), and vice versa. Preferably, the light sources (6; 7) comprise a plurality of blue, green, (amber) and red LEDs, each preferably having a luminous flux of at least 5 lumen. to claim 1, wherein the detecting means comprises a light emitting element and a light reception element, detects the ink droplets ejected from the ink jet head between the light emitting element and the light reception element, and outputs a detection signal in accordance with a change quantity of the light which reaches the light reception element. 3. The ink jet recording apparatus according to claim 1, wherein the ink jet head has a plurality of nozzle series corresponding to the inks of the plurality of colors, respectively, and which further has ejecting position control means for controlling an ink ejecting start position in accordance with the color of the ink ejected by ink ejecting means. 4. The ink jet recording apparatus according to claim 1, wherein the ink jet head has a plurality of ejection energy generating elements for ejecting the inks, and the control means controls the ink ejection cycle by changing a driving cycle of the ejection energy generating elements. 5. The ink jet recording apparatus according to claim 1, wherein the speed control means controls a driving frequency of the moving means to control the moving speed of the ink jet head. 6. The ink jet recording apparatus according to claim 1, wherein the ink jet head has a plurality of ejection energy generating elements for ejecting the inks, and the control means controls the number of the ejected inks by changing a driving number of the ejection energy generating elements. 7. An ink detection method in an ink jet recording apparatus which performs recording on a recording medium by ejecting inks of a plurality of different colors by the use of an ink jet head for ejecting the inks, said ink detection method comprising: a moving step of moving the ink jet head to detecting means, installed externally from the ink jet head at a predetermined position within an area to which the ink jet head is moved, for detecting ink droplets ejected from the ink jet head and outputting a detection signal in accordance with a detection result, an ink ejecting step of ejecting the inks from the ink jet head when the ink jet head is located in a predetermined area including the predetermined position during the moving of the ink jet head in the moving step, and a deciding step of deciding the presence of ink ejection on the basis of the detection signal output by the detecting means, at least one condition of the ink ejection cycle in the ink ejecting step, the moving speed of the ink jet head in the moving step and the number of the inks ejected within the predetermined area in the ink ejecting step being changed, in accordance with the colors of the inks. 8. The ink detection method according to claim 7, wherein the detecting means comprises a light emitting element and a light reception element, and outputs a different detection signal in accordance with whether or not the ink droplets pass through an optical axis between the light emitting element and the light reception element, and the ink ejecting step ejects the ink to the predetermined area including the optical axis. 9. The ink detection method according to claim 7, wherein the ink jet head has a plurality of nozzle series corresponding to the inks of the plurality of colors, respectively, and which further has ejecting position control means for controlling an ink ejecting start cycle in accordance with the color of the ink ejected by ink ejecting step. 10. The ink detection method according to claim 7, wherein the ink jet head has a plurality of ejection energy generating elements for ejecting the inks, and the control of the ink ejection cycle is performed by changing a driving cycle of the ejection energy generating elements. 11. The ink detection method according to claim 7, wherein the movement of the ink jet head is performed by the drive of a motor, and the change of the moving speed of the ink jet head is performed by the control of the drive of the motor. 12. The ink detection method
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