Patent ID: 8279160

Claim:
An LED driving device comprising: plural first and second LED driving terminals connectable to respective light-emitting elements comprising LED elements; first and second LED driving circuits connected to said first and second LED driving terminals, respectively, for energizing said light-emitting elements when connected to said first and second LED driving terminals to emit light according to stored content; a data input terminal into which light emission data indicating the light emission status of said light-emitting device are input sequentially; a data output terminal that outputs the light emission data output from said first or second shift register to the outside; and first and second shift registers that store said light emission data in the input order, store the same number of light emission data as there are the first and second LED driving terminals, respectively, and output the overflow light emission data whereby when a transmission signal is input, said light emission data stored in said first and second shift registers are transmitted into said first and second LED driving circuits and are stored in said first and second LED driving circuits, respectively; wherein the LED driving element has a switching circuit that switches between a normal mode in which said data input terminal, said first shift register, said second shift register, and said data output terminal are connected in series, said light emission data input to said data input terminal are transmitted to said first shift register and said second shift register in that order and are output from said data output terminal, and an image quality improvement mode in which a selected one of said first or second shift register is connected between said data input terminal and said data output terminal, said light emission data input to said data input terminal are transmitted into the shift register connected to said data input terminal and said data output terminal and are output from said data output terminal, wherein data stored in a non-selected one of said first or second shift registers is retained and data input to said selected one of said first or second shift registers is replaced with data to form a darkened line on the LEDs connectable to the device, wherein the data to generate the darkened line is generated outside the display and the time to rewrite the data is reduced to m*n*t, where: m=the number of LED driving elements connected in series, n=the number of driving terminals in each first and second column, and t=the duration of the pulse.