Patent ID: 8638283

Claim:
A timing controller to be used for displaying a reverse video image comprising: a difference measuring unit to measure, based on a timing signal to be supplied from an outside for every predetermined period to regulate driving of a display panel, a vertical start pulse signal to be outputted when a scanning line driving circuit, which has a cascaded shift register configuration, drives said display panel, and a cascade output signal being outputted from said scanning line driving circuit when a specified period of time has elapsed after said vertical start pulse signal has been fed to said scanning line driving circuit, a difference “M−L” between a count “L” of valid driving lines of said display panel and a total count “M” (M>L) of outputs from said scanning line driving circuit; and a signal outputting unit to output a vertical start pulse signal in reverse scanning from bottom to top on said display panel with timing shifted from a reference time for a vertical start pulse signal in sequential scanning from top to bottom on said display panel, the shifted timing being determined based on said difference measured by said difference measuring unit, first to L-th outputs from said scanning line driving circuit are connected to said valid driving lines of said display panel, counting from a start side of said sequential scanning, whereas L+1-th to M-th outputs from said scanning line driving circuit are excessive outputs which are not connected to said valid driving lines of said display panel, wherein said difference measuring unit comprises: a valid line counting unit to count said count “L” of said valid driving lines for an image to be displayed on said display panel based on said timing signal; a cascade signal counting unit to count said total count “M” of outputs from said scanning line driving circuit based on said cascade output signal to be outputted from said scanning line driving circuit at a time of said reverse scanning from the bottom to the top and on said vertical start pulse signal to be supplied to said scanning line driving circuit at the time of said reverse scanning from the bottom to the top; and a calculating unit to calculate said difference “M−L” between said count “L” of valid driving lines outputted from said valid line counting unit and said total count “M” of outputs outputted from said cascade signal counting unit and determine a count of excessive outputs from said canning line driving circuit, based on the calculated difference.