Electron-beam apparatus and image forming apparatus

18 Pages·2013·1.42 MB·English

US006294876B1
(12) United States Patent (10) Patent N0.: US 6,294,876 B1
Ando et al. (45) Date of Patent: Sep. 25, 2001
(54) ELECTRON-BEAM APPARATUS AND OTHER PUBLICATIONS
IMAGE FORMING APPARATUS
J. Dyke et al., “Field Emission”, Advances in Electronics
(75) Inventors: Muneki Ando, Atsugi; Kenji Shino, and Electron Physics, vol. VIII, 1956, pp. 89—185.
M.I. Elinson et al., “The Emission of Hot Electrons and The
Yokohama, both of (JP)
Field Emission of Electrons From Tin Oxide”, Radio Engi
(73) Assignee: Canon Kabushiki Kaisha, Tokyo (JP) neering and Electronic Physics, Jul. 1965, pp. 1290—1296.
H. Araki, “Electroforming and Electron Emission of Carbon
( * ) Notice: Subject to any disclaimer, the term of this Thin Films”, Journal of the Vacuum, Society of Japan, 1983,
patent is extended or adjusted under 35 pp. 22—29 (With English Abstract on p. 22).
U.S.C. 154(b) by 0 days. G. Dittmer, “Electrical Conduction and Electron Emission
of Discontinuous Thin Films”, Thin Solid Films, 9, 1972,
(21) Appl. No.: 09/512,362 pp. 317—328.
M. HartWell, “Strong Electron Emission From Patterned
(22) Filed: Feb. 24, 2000 Tin—Indium Oxide Thin Films”, IEDM, 1975, pp. 519—521.
(30) Foreign Application Priority Data C.A. Spindt, “Physical Properties of Thin—Film Emission
Cathodes With Molybdenum Cones”, J. Applied Physics,
Feb. 24, 1999 (JP) ............................................... .. 11-047125 vol. 47, No. 12, Dec. 1976, pp. 5248—5263.
Dec. 20, 1999 (JP) ............................................... .. 11-361254 R. Meyer, “Recent Development on ‘Microtips’ Display at
LETI”, Tech. Digest of IVMC 91, 1991, pp. 6—9.
(51) Int. Cl.7 ..................................................... .. G09G 3/10
C.A. Mead, “Operation of Tunnel—Emission Devices”, J our
(52) US. Cl. ..................... .. 315/169.1; 315/168; 345/100;
nal of Applied Physics, Apr. 1961, pp. 646—652.
345/132; 313/309
(58) Field of Search ................................... .. 315/167, 168, * cited by examiner
315/169.1, 169.2, 169.3, 169.4, 326, 334,
339, 345/74—76, 91, 92, 95, 98,87, 100, Primary Examiner—Haissa Philogene
132, 313/309, 495 (74) Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
Scinto
(56) References Cited
(57) ABSTRACT
U.S. PATENT DOCUMENTS
This invention stabilizes the electron emission amount and
4,206,386 * 6/1980 Akutsu et al. .................. .. 315/1694 displays an image on the entire display screen With a
4,315,259 * 2/1982 McKee et al. .............. .. 315/1694 X luminance faithful to an original image signal, While pre
4,904,895 2/1990 Tsukamoto et a1. ............... .. 313/336 venting characteristic degradation and destruction of an
5,066,883 11/1991 Yoshioka et a1. .. 313/309
electron source. In an apparatus according to this invention,
5,157,309 10/1992 Parker et al. 315/1691
a V/I converter (108) includes n independent constant cur
5,569,974 10/1996 Morikawa et al. ..... .. 313/310
5,627,436 * 5/1997 Suzuki et al. 315/1691 rent sources in correspondence With n column-direction
5,682,085 10/1997 Suzuki et al. .. 315/1691 Wirings. Each constant current source (108) is made up of an
5,939,824 * 8/1999 Kishi et al. 313/495 operational ampli?er, transistor, and resistor. Avoltage lim
6,005,540 * 12/1999 Shinjo et al. 345/74 iting circuit (209) uses a diode A limit value setting
6,072,457 * 6/2000 Hashimoto et a1. ............... .. 345/100 circuit (110) is constituted by, e.g., a D/A converter and
buffer ampli?er or a potentiometer and buffer ampli?er
FOREIGN PATENT DOCUMENTS
connected to a poWer supply. A spike current absorbing
0596 242 A1 5/1994 (EP). means (211) uses a capacitor As the capacitance
0686 960A2 12/1995 (EP). increases, the Wiring voltage rise (AVs) decreases. Thus, the
64-31332 2/1989 (JP). necessary capacitance of the capacitor (C) of the spike
2-257551 10/1990 (JP).
current absorbing means (211) is desirably 0.1 pF or more.
3-55738 3/1991 (JP).
4-28137 1/1992 (JP).
9-90897 4/1997 (JP). 47 Claims, 9 Drawing Sheets
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ABSCREJNG
MEWS
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U.S. Patent Sep. 25,2001 Sheet 1 0f 9 US 6,294,876 B1
F | G. 1
VIDEO SIGNAL
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105“ $55
S/H CIRCUIT
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A’ \,\ LIMIT VALUE SETTING
107 PULSE WIDTH MODULATOR CIRCUIT
By1 By2 By3 . . . . . Byn Iim1 Iim2 Iim3 . . .. . Iimn
209
108 w V/I CONVERTER \/\ VOLTAGE LIMITING CIRCUIT
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SCANNING 5x31 Dx3
CIRCUIT Y DISPLAY PANEL i
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U.S. Patent Sep. 25,2001 Sheet 4 0f 9 US 6,294,876 B1
FIG. 4
PRIOR ART
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U.S. Patent Sep. 25,2001 Sheet 5 0f 9 US 6,294,876 B1
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PRIOR ART
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U.S. Patent Sep. 25,2001 Sheet 6 6f 9 US 6,294,876 B1
FIG. 6
PRIOR ART
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U.S. Patent Sep. 25,2001 Sheet 7 0f 9 US 6,294,876 B1
F | G. 7
PRIOR ART
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U.S. Patent Sep. 25,2001 Sheet 8 0f 9 US 6,294,876 B1
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U.S. Patent Sep. 25,2001 Sheet 9 0f 9 US 6,294,876 B1
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