Color LCD display control system

Claim 2

A system corresponding to claim 1, characterized in that said flat panel display unit is constituted by a liquid crystal display (LCD).

Claim 3

A system according to claim 1, characterized by further comprising a CRT controller (11) for outputting vertical and horizontal sync signals for controlling a display timing of a CRT display unit, and characterized in that said means for simultaneously scanning a plurality of lines in non-display regions comprises means for generating a scanning start signal for said LCD on the basis of the vertical sync signal (VSYNC) from said CRT controller.

Claim 4

A system according to claim 2, characterized in that said means for simultaneously scanning a plurality of lines in the non-display regions comprises means (25, 27, 29) for calculating a timing of generation of a scanning start signal (SD) on the basis of the vertical sync signal and a physical dot count of said LCD in the vertical direction; and means for simultaneously scanning upper and lower non-display portions of said LCD in response to the scanning signal.

Claim 5

A system according to claim 2, characterized in that said means for simultaneously scanning a plurality of lines in the non-display regions comprises: counter means (25) for performing a count operation in synchronism with a vertical sync signal output from said CRT controller; means (27) for setting a count value unique to a designated display resolution; means (29) for outputting a scanning start signal when said counter means counts the count value unique to the designated display resolution; and means (25, 27, 29, 31) for outputting the scanning start signal before a scanning operation with respect to a physical display resolution of an LCD is completed, thereby simultaneously scanning upper and lower non-display portions of said LCD.

Claim 6

A system according to claim 1, characterized by further comprising a CRT controller (11) for outputting vertical and horizontal sync signals for controlling a display timing of said CRT display unit, and characterized in that said means for simultaneously scanning a plurality of lines in non-display regions comprises: first input means (Fig. 5) for inputting timing signals including data and vertical and horizontal sync signals generated by said CRT controller; and second input means (Fig. 6) for inputting information representing a vertical display resolution supplied from a processing unit to which said display unit is connected; X and Y drivers (31, 33) for respectively driving vertical and horizontal pixels constituting said LCD; and means (25, 27, 29) for generating a scanning start timing signal for said Y driver on the basis of the vertical sync signal and the information representing the display resolution.

Claim 7

A system according to claim 1, characterized in that said flat panel display unit comprises means (39 in Fig. 2) for discriminating a designated display resolution; and means for generating a scanning start signal (SD) corresponding to the display resolution discriminated by said discriminating means, and outputting the scanning start signal to said flat panel display unit.

Claim 8

A system according to claim 1, characterized by further comprising a CRT controller for outputting vertical and horizontal sync signals for controlling a display timing of said CRT display unit, and characterized in that said flat panel display unit comprises means (Fig. 12) for generating a scanning start signal (SD) corresponding to a display resolution on the basis of a signal, output from said CRT controller, representing a valid display period (ENAB) of said flat panel display unit, and outputting the scanning start signal to said flat panel display unit.

Claim 9

A display system characterized by comprising: a flat panel display unit (35) having predetermined numbers of display dots in vertical and horizontal directions; and means (25, 27, 29, 31) for simultaneously scanning a plurality of lines in non-display regions during a period corresponding to a one-line scan in the valid display region when data is to be displayed on said LCD while the number of dots in at least one of the vertical and horizontal directions is set to the smaller than the number of dots of said LCD in a corresponding direction.

Claim 10

A system according to claim 9, characterized in that said flat panel display unit is constituted by a liquid crystal display (LCD).

Claim 11

A system according to claim 9, characterized in that said means for scanning the non-display regions a plurality of times comprises: first counter means (67, 69) for counting the number of display lines in the valid display region; second counter means (57, 61) for counting the number of scanning lines in the non-display regions; means (VSC, 71, 85) for scanning the valid display region of said flat panel display in a first scanning period while said first counter means performs a count operation; and means (73, 75, 77, 79, 81, 83, 85) for scanning the non-display regions of said flat panel in a period shorter than the first scanning period while said second counter means performs a count operation.

Claim 12

A system according to claim 9, characterized in that said means for scanning the non-display regions a plurality of times comprises: first input means (Fig. 5) for inputting timing signals including data and vertical and horizontal sync signals generated by said CRT controller; second input means (Fig. 6) for inputting information representing a vertical display resolution supplied from a processing unit to which said display unit is connected; X and Y drivers (31, 33) for respectively driving vertical and horizontal pixels constituting said LCD; first counter means (67, 69) for counting the number of display lines in the valid display region; second counter means (57, 61) for counting the number of scanning lines in the non-display regions; means (Fig. 13, 71, 85) for generating a scanning signal having a first clock frequency and outputting the generated scanning signal to said Y driver while said first counter means performs a count operation; and means (73, 75, 77, 79, 81, 83, 85) for generating a scanning signal having a second clock frequency, which has a shorter duration than the scanning signal of the first clock frequency, and outputting the generated scanning signal to said Y driver while said second counter means performs a count operation.