Patent ID: 6771244
Filing Date: 2004-08-03
Classification: G02F,G09G,H05K

Abstract:
A display apparatus comprising:a display device; a scan line driver IC provided on tape substrate means for generating a scan selection signal and a scan non-selection signal to drive said display device; an information line driver IC, provided on said tape substrate means, that generates an information signal to drive said display device; bus board means for supplying voltage signals to said scan line driver IC and said information line driver IC; a plurality of scan line input leads and a plurality of information line input leads arranged on said tape substrate means and connected between said bus board means and a respective one of said driver ICs; a plurality of scan line output leads and a plurality of information line output leads arranged on said tape substrate means and connected between a respective one of said driver ICs and said display device; a plurality of dummy leads which are electrically not related to driving of an image display, comprising: a scan line dummy input lead and an information line dummy input lead each connected between said bus board means and said tape substrate means and positioned between an edge of said tape substrate means and a respective one of said scan line input leads and said information line input leads; and a scan line dummy output lead and an information line dummy output lead each electrically connected to a respective one of said scan line dummy input lead and said information line dummy input lead and positioned between an edge of said tape substrate means and a respective one of said scan line output leads and said information line output leads, where said dummy leads are electrically isolated from said driver ICs; and wherein said bus board is arranged to supply a first predetermined voltage waveform to said scan line dummy leads and a second predetermined voltage to said information line dummy lead; the first predetermined voltage waveform is the non-selection signal, so that the voltage difference between the scan line dummy leads and the nearest scan line output lead, averaged over a predetermined time period, is zero or nearly zero; and the second predetermined voltage waveform is the time-averaged value of the voltage waveform on the information line output lead nearest the information line dummy leads, so that the voltage difference between said information line dummy leads and said nearest information line output lead, averaged over a predetermined time period, is zero or nearly zero.