Patent ID: 6295042
Filing Date: 2001-09-25
Classification: G09G

Abstract:
A display apparatus, comprising:a display panel having a display area (h.times.w) and cell gap (d) and including electrodes arranged in a matrix form and comprising a number (Nc) of scanning electrodes each having a resistance (Rt) and a capacitance (Ct), and a number of data electrodes;a circuit for generating a rectangular drive signal waveform supplied to the scanning electrodes and a data signal waveform supplied to the data electrodes, respectively, of the display panel; anda low-pass filter for recovering a frequency component exceeding a prescribed cut-off frequency (f) from the rectangular drive signal waveform to form a resultant drive signal waveform that is generally rectangular but with moderately sloped rising and falling portions, and applying the resultant drive signal waveform to inlet ends of the scanning electrodes in the display panel,wherein said cut-off frequency (f) is prescribed according to the following formula:f=1/(4.pi.(Rt/10).times.(Ct/10)),wherein Rt denotes a scanning electrode resistance, and Ct denotes a scanning electrode capacitance determined according to the following formula:Ct=h.times.w.times..epsilon.o.times..epsilon./(Nc.times.d),wherein h denotes a vertical size of the panel display area; w, a horizontal size of the panel display area; Nc, the number of the scanning electrodes; d, the cell gap; .epsilon.o, a permittivity: and .epsilon., a dielectric constant.