Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2005-02-07
2008-12-30
Tran, My-Chau T (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S076000, C345S080000, C345S084000, C345S204000, C345S211000
Reexamination Certificate
active
07471288
ABSTRACT:
A clock signal in synchronization with a data writing signal, every scanning line, which is supplied from a light-emitting control circuit4to a scanning driver6, is supplied to an oscillator12which generates a reference switching signal, according to a PWM method, in a DC-DC converter8. Thereby, the timing at data writing every scanning line is in synchronization with the phase of a ripple component superimposed on a driving voltage Va from the DC-DC converter8. Accordingly, a problem that there is caused a state in which light-emitting intensity is different every scanning line can be solved because the same voltage Vgs between a gate and a source is supplied every scanning line to a light-emitting driving transistor Tr2at any time even if the ripple component by switching of the DC-DC converter is superimposed on the driving voltage Va. Thereby, a problem that the display quality of images is remarkably reduced can be prevented in a light-emitting driving operation of a display panel, wherein the operation has a configuration in which an organic EL element with a light-emitting intensity characteristic of a current dependence type, for example, is used as a pixel.
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Chinese Office Action dated Jul. 20, 2007, issued in corresponding Chinese Patent Application No. 200510008058.1 and a partial English translation.
Hayafuji Akinori
Kanauchi Katsuhiro
Tohoku Pioneer Corporation
Tran My-Chau T
Westerman, Hattori, Daniels & Adrian , LLP.
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