Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A method of driving a matrix display panel (4, 4a) formed of a plurality of pixels (C) each having a memory function, comprising steps of: dividing a period of a frame (FM) displaying a single picture into a plurality of subframes (SF), each subframe comprising: an addressing period (CYa), for addressing a pixel by selectively forming a memory medium in a selected one of all the pixels (C); and a display period (CYi) for lighting said addressed pixel by an application of sustain pulses (Ps), each subframe being allocated with a predetermined number of said sustain pulses, said allocated number being different for each subframe so as to weight a gradation to said respective subframe, whereby a gradation of visual brightness of said lit pixel is determined by selectively operating said subframe(s) for each of said pixel for each frame.
Claim 2
Dependent Claim
44 words
A method as recited in claim 1, wherein said addressing period (CYa) comprises the steps of: applying a write pulse (PW) to all the pixels (C) so as to form a memory medium in each of said pixels; and selectively erasing said memory medium.
Claim 3
Dependent Claim
40 words
A method as recited in claim 2, wherein said addressing period (CYa) comprises the steps of: applying a write pulse (PW) concurrently to all the pixels (C); and selectively erasing said memory medium on a selected one of scanning electrodes.
Claim 4
Dependent Claim
40 words
A method as recited in claim 1, wherein said number of sustain pulses in said subframe is determined by a time length of said display period containing sustain pulses of a constant frequency, said period being different for each subframe.
Claim 5
Dependent Claim
36 words
A method as recited in claim 1, wherein said number of sustain pulses in said subframe is determined by a frequency of sustain pulses applied in said display period, said frequency is different for each subframe.
Claim 6
Dependent Claim
24 words
A method as recited in claim 1, wherein said memory medium is formed of a wall charge in a pixel of said display panel.
Claim 7
Dependent Claim
16 words
A method as recited in claim 6, wherein said display panel is an AC-type display panel.
Claim 8
Dependent Claim
24 words
A method as recited in claim 1, wherein said memory medium is formed of a space charge in said pixel of said display panel.
Claim 9
Dependent Claim
25 words
A method as recited in claim 8, wherein said display panel is a DC-type display panel, an electroluminescent panel or a liquid crystal display panel.
Claim 10
Dependent Claim
137 words
A driving circuit for providing a gradation of visual brightness of a matrix flat display panel (4) formed of a plurality of pixels (C) at crossed points of the matrix, comprising: first means (13) for dividing with time a single frame (FM) to be displayed on the panel (4) into a plurality of subframes (SF); second means (14) for selectively forming a memory medium in said pixels during an address period, for lighting said pixels having said memory medium formed therein during a display period subsequent to said addressing means, time length of said display period being different for each of said subframes, and for selectively operating said subframes, whereby the gradation of visual brightness of the pixel is determined by accumulation of time lengths of display periods of said selectively operated subframes through said single frame.