Source: http://www.google.com/patents/US6838814?dq=7,546,338
Timestamp: 2013-12-05 07:27:53
Document Index: 694384719

Matched Legal Cases: ['art 401', 'art 402', 'arts 401', 'arts 401', 'arts 402', 'arts 401']

Patent US6838814 - Field emission display device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA field emission display device (1) includes a cathode plate (20), a resistive buffer (30) in contact with the cathode plate, a plurality of electron emitters (40) formed on the buffer, and an anode plate (50) spaced from the electron emitters. Each electron emitter includes a rod-shaped first part (401)...http://www.google.com/patents/US6838814?utm_source=gb-gplus-sharePatent US6838814 - Field emission display devicePublication numberUS6838814 B2Publication typeGrantApplication numberUS 10/194,682Publication dateJan 4, 2005Filing dateJul 12, 2002Priority dateJul 12, 2002Fee statusLapsedAlso published asCN1240098C, CN1467776A, US20040007963Publication number10194682, 194682, US 6838814 B2, US 6838814B2, US-B2-6838814, US6838814 B2, US6838814B2InventorsGa-Lane ChenOriginal AssigneeHon Hai Precision Ind. Co., LtdPatent Citations (15), Referenced by (3), Classifications (18), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetField emission display deviceUS 6838814 B2Abstract A field emission display device (1) includes a cathode plate (20), a resistive buffer (30) in contact with the cathode plate, a plurality of electron emitters (40) formed on the buffer, and an anode plate (50) spaced from the electron emitters. Each electron emitter includes a rod-shaped first part (401) and a conical second part (402). The buffer and first parts are made from silicon nitride. The combined buffer and first parts has a gradient distribution of electrical resistivity such that highest electrical resistivity is nearest the cathode plate and lowest electrical resistivity is nearest the anode plate. The second parts are made from niobium. When emitting voltage is applied between the cathode and anode plates, electrons emitted from the electron emitters traverse an interspace region and are received by the anode plate. Because of the gradient distribution of electrical resistivity, only a very low emitting voltage is needed.
a cathode plate; a resistive buffer formed on the cathode plate; a plurality of electron emitters arranged on the resistive buffer, each of the electron emitters comprising a first part in contact with the resistive buffer; and an anode plate spaced from the electron emitters thereby defining an interspace region therebetween; wherein the resistive buffer and at least portions of the first parts are made of silicon nitride, and the combined resistive buffer and the first parts comprises at least one gradient distribution of electrical resistivity such that highest electrical resistivity is nearest the cathode plate and lowest electrical resistivity is nearest the anode plate. 2. The field emission display device as described in claim 1, wherein each electron emitter further comprises a second part formed from niobium, proximate to the first part.
a cathode plate; a resistive buffer formed on the cathode plate; a plurality of electron emitters arranged on the resistive buffer, each of the electron emitters comprising a first part in contact with the resistive buffer; and an anode plate spaced from the electron emitters thereby defining an interspace region therebetween; wherein the resistive buffer and at least portions of the first parts are made of silicon nitride, and the resistive buffer comprises at least one gradient distribution of electrical resistivity such that highest electrical resistivity is nearest the cathode plate and lowest electrical resistivity is nearest the anode plate. 12. The field emission display device as described in claim 11, wherein each electron emitter further comprises a second part formed from niobium, proximate to the first part.
a cathode plate; an anode plate spaced from the cathode plate; and a plurality of electron emitters positioned between the cathode plate and the anode plate, each of the electron emitters being a nano-tube comprising a rod-like first part proximate the cathode plate, and a conical second part adjoining the first part while spaced from the anode plate; wherein the first part is made of silicon nitride having high electrical resistivity, and the second part is made of niobium having low electrical resistivity. 18. The field emission display device as described in claim 17, wherein the electron emitters are equally spaced from one another in a direction perpendicular to an extension direction of the electron emitters.
19. The field emission display device as described in claim 18, wherein no other structures are located between every two adjacent emitters.
20. The field emission display device as described in claim 17, wherein a buffer is in contact with the cathode plate, the electron emitters extend from said buffer, and said buffer is made of silicon nitride.
In recent years, flat display devices have been developed and widely used in electronic applications such as personal computers. One popular kind of flat panel display device is an active matrix liquid crystal display (LCD) that provides high resolution. However, the LCD has many inherent limitations that render it unsuitable for a number of applications. For instance, LCDs have numerous manufacturing shortcomings. These include a slow deposition process inherent in coating a glass panel with amorphous silicon, high manufacturing complexity, and low yield of units having satisfactory quality. In addition, LCDs require a fluorescent backlight. The backlight draws high power, yet most of the light generated is not viewed and is simply wasted. Furthermore, an LCD image is difficult to see under bright light conditions and at wide viewing angles. Moreover, the response time of an LCD is dependent upon the response time of the liquid crystal to an applied electrical field, and the response time of the liquid crystal is relatively slow. A typical response time of an LCD is in the range from 25 ms to 75 ms. Such difficulties limit the use of LCDs in many applications such as High-Definition TV (HDTV) and large displays. Plasma display panel (PDP) technology is more suitable for HDTV and large displays. However, a PDP consumes a lot of electrical power. Further, the PDP device itself generates too much heat.
Other flat panel display devices have been developed in recent years to improve upon LCDs and PDPs. One such flat panel display device, a field emission display (FED) device, overcomes some of the limitations and provides significant advantages over conventional LCDs and PDPs. For example, FED devices have higher contrast ratios, wider viewing angles, higher maximum brightness, lower power consumption, shorter response times and broader operating temperature ranges compared to conventional thin film transistor liquid crystal displays (TFT-LCDs) and PDPs.
In order to achieve the objects set above, an FED device in accordance with a preferred embodiment of the present invention comprises a cathode plate, a resistive buffer formed on the cathode plate, a plurality of electron emitters formed on the buffer, and an anode plate spaced from the electron emitters thereby defining an interspace region therebetween. Each of the electron emitters substantially comprises a rod-shaped first part adjacent the buffer, and a conical second part distal from the buffer. The buffer and the first parts are made from silicon nitride (SiNx), in which x can be controlled according to the required stoichiometry. This ensures that the combined buffer and first parts has a gradient distribution of electrical resistivity such that highest electrical resistivity is nearest the cathode plate and lowest electrical resistivity is nearest the anode plate. The second parts are respectively formed on the first parts and are made from niobium. When emitting voltage is applied between the cathode and anode plates, electrons emitted from the electron emitters traverse the interspace region and are received by the anode plate. Because of the gradient distribution of electrical resistivity, only a very low emitting voltage needs to be applied.
Referring also to FIG. 2, each electron emitter 40 comprises a rod-shaped first part 401 formed on the buffer 30, and a conical second part 402 distal from the buffer 30. The buffer 30 and the first parts 401 are made from silicon nitride (SiNx), in which x can be controlled according to the required stoichiometry. In the preferred embodiment, x is controlled to ensure that the combined buffer 30 and first parts 401 has a gradient distribution of electrical resistivity such that highest electrical resistivity is nearest the cathode plate 20 and lowest electrical resistivity is nearest the anode plate 50. The second parts 402 are formed on the respective first parts 401 and are made from niobium (Nb).
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