A driving device for a display panel and a driving method of the same

Claim 1

A driving device for a matrix type display panel having a first substrate, a second substrate opposed to the first substrate, data electrodes disposed on the first substrate substantially in parallel with a first direction, scanning electrodes disposed substantially in parallel with a second direction on a surface of the second substrate facing to the first substrate, and display dots each provided on a crossing of each of the data electrodes and each of the scanning electrodes, the first direction being vertical to the second direction; the driving device comprising: an orthogonal function generator for generating a series of orthogonal signals indicating orthogonal function series; an orthogonal transformation arithmetic circuit for receiving display data and the orthogonal signals, and conducting an orthogonal transformation based on the display data and the orthogonal signals to generate data signals; a scanning electrode driving circuit for receiving the orthogonal signals to apply scanning signals corresponding to the orthogonal signals to the scanning electrodes; a data electrode driving circuit for receiving the data signals to apply data voltage signals corresponding to the data signals to the data electrodes synchronously with the scanning signals; and a DIS signal generator for generating a DIS signal, the DIS signal being sent to the scanning electrode driving circuit and the data electrode driving circuit for providing a plurality of inactive portions, each having a predetermined potential and a predetermined period, to each of the scanning signals and the data signals.

Claim 7

A method for driving a display apparatus: the display apparatus comprising: a matrix type display panel having a first substrate, a second substrate opposed to the first substrate, data electrodes disposed on the first substrate substantially in parallel with a first direction, scanning electrodes disposed substantially in parallel with a second direction on a surface of the second substrate facing to the first substrate, and display dots each provided on a crossing of each of the data electrodes and each of the scanning electrodes, the first direction being vertical to the second direction; an orthogonal transformation arithmetic circuit for generating data signals by orthogonally transforming display data by using orthogonal function series; a scanning electrode driving circuit for applying scanning signals corresponding to the orthogonal function series to the scanning electrodes; a data electrode driving circuit for applying data voltage signals corresponding to the data signals to the data electrodes; and a DIS signal generator for generating a DIS signal to provide a plurality of inactive portions, each having a predetermined potential and a predetermined period, to each of the scanning signals and the data signals; the method comprising the steps of: applying the DIS signal to the scanning electrode driving circuit and the data electrode driving circuit; providing the inactive portions to the scanning signal in accordance with the DIS signal by the scanning electrode driving circuit; and providing the inactive portions to the data signal in accordance with the DIS signal by the data electrode driving circuit; whereby a plurality of the inactive portions are periodically provided to one frame of voltage signal to be applied to each of the display dots.

Claim 19

A method for driving a display apparatus: the display apparatus comprising: a matrix type display panel having a first substrate, a second substrate opposed to the first substrate, data electrodes disposed on the first substrate substantially in parallel with a first direction, scanning electrodes disposed substantially in parallel with a second direction on a surface of the second substrate facing to the first substrate, and display dots each provided on a crossing of each of the data electrodes and each of the scanning electrodes, the first direction being vertical to the second direction, numbers of the data electrodes and the scanning electrodes being M and N, respectively; a display data generator for generating display data and auxiliary data; an orthogonal function generator for generating orthogonal signals indicating L orthogonal function series, wherein L = 2 r , r being a natural number; an orthogonal transformation arithmetic circuit for receiving the display data, the auxiliary data and the L orthogonal signals to generate data signals; a scanning electrode driving circuit for receiving the L orthogonal signals to apply scanning signals corresponding to the L orthogonal signals to the scanning electrodes; and a data electrode driving circuit for receiving the data signals to apply data voltage signals corresponding to the data signals to the data electrodes; the method adopting a first method when L ≧ N and a second method when L < N; the first method comprising the steps of: dividing one frame into L unit terms; assuming N' auxiliary scanning electrodes in each term, wherein N' = L-N ; generating N' x M auxiliary display data corresponding to the N' auxiliary scanning electrodes; conducting an orthogonal transformation based on the display data, the auxiliary display data and the L orthogonal signals to generate L x M data signals; scanning the N scanning electrodes to apply the scanning signals corresponding to the N orthogonal signals to the scanning electrodes and applying the N' orthogonal signals to the auxiliary scanning electrodes; and applying the data voltage signals to the M data electrodes synchronously with the scanning of the scanning electrodes; the second method comprising the steps of: dividing one frame into [N/L]+1 = P+1 block terms; dividing each of the first to Pth block terms into L unit terms; in each of the L unit terms, generating L x M data signals based on the display data corresponding to the L scanning electrodes and the L orthogonal signals; scanning the N scanning electrodes to apply the scanning signals corresponding to the orthogonal signals to the scanning electrodes; and applying the data voltage signals to the M data electrodes synchronously with the scanning electrodes; in (P+1)th block term, dividing the (P+1)th block term into L unit terms; in each of the L unit terms in the (P+1)th block term, assuming N' auxiliary scanning electrodes, N' being L(P+1)-N ; generating N' x M auxiliary display data corresponding to the N' auxiliary scanning electrodes; generating L x M data signals based on the display data, the auxiliary display data and the L orthogonal signals; and scanning the N scanning electrodes to apply the scanning signals corresponding to the N orthogonal signals to the scanning electrodes and applying the N' orthogonal signals to the auxiliary scanning electrodes.