BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention will appear more fully upon consideration of the exemplary embodiments of the invention, which are schematically set forth in the drawings, in which:
FIG. 1 is a block diagram illustrating an overall configuration of a liquid crystal display in accordance with an exemplary embodiment of the invention in which the dynamic color management system is adopted;
FIGS. 2A to 2D are explanatory diagrams illustrating an example in which light sources are dynamically driven to enhance a particular display color;
FIG. 3 is a circuit diagram illustrating an example of the configuration of light source driving circuits in accordance with an emission intensity modulation system;
FIG. 4 is a circuit diagram illustrating an example of the configuration of the light source driving circuits in accordance with a pulse width modulation system;
FIGS. 5A to 5E are explanatory diagrams illustrating a sequential drive system in which the number of emission times of each color during a one-frame period is dynamically changed;
FIG. 6 is a circuit diagram illustrating an example of the configuration of the light source driving circuits of the system in which the number of emission times during the one-frame period is changed;
FIG. 7 is a diagram illustrating waveforms of major signals and their timings for explaining the operation of the circuitry shown in FIG. 6;
FIGS. 8A to 8D are explanatory diagrams illustrating an example in which control of the backlight sources and gradation control of a display image are executed simultaneously;
FIGS. 9A to 9D are explanatory diagrams illustrating a method of optimizing the driving of light sources from the perspective of the response speed of the liquid crystal cell;
FIG. 10 is a schematic diagram as one example of the configuration of a liquid crystal display in accordance with t an exemplary embodiment of the invention;
FIGS. 11A to 11F are diagrams illustrating examples of the layout of LEDs in a case where the LEDs are used as the backlight sources;
FIGS. 12A and 12B are diagrams illustrating examples of the configuration of the backlight, in which FIG. 12A is a diagram illustrating the configuration of a directly-below type, and FIG. 12B is a diagram illustrating the configuration of a side edge type;
FIG. 13 is a diagram illustrating the configuration of a backlight using light sources arranged in box-shapes;
FIG. 14 is a diagram illustrating the configuration of a backlight in which cold-cathode tubes and LEDs are combined;
FIGS. 15A and 15B are diagrams illustrating examples of a reproducible color gamut in the CIE color system (color space), in which FIG. 15A is a diagram illustrating a reproducible color gamut of a liquid crystal display using cold-cathode tubes, and FIG. 15B is a diagram illustrating a reproducible color gamut of a liquid crystal display using the combination of cold-cathode tubes and LEDs which are YMC light sources;
FIGS. 16A and 16B are diagrams illustrating an example of a lighting operation method for the backlight of the directly-below type proposed for the moving picture display, in which FIG. 16A is a diagram illustrating the layout of the backlight of the directly-below type in which eight tubular fluorescent lamps are disposed in face-to-face relation to the display screen (the dotted-line frame), and FIG. 16B is a diagram illustrating as drive waveforms timings of lighting starting times for the respective lamps; and
FIGS. 17A and 17B are diagrams illustrating examples of the driving mode of the backlight of the directly-below type proposed for the moving picture display, in which FIG. 17A is a diagram illustrating an example of the method of driving a backlight constituted by a white cold-cathode tube in the background art, and FIG. 17B is a diagram illustrating an example of the method of driving a field sequential backlight constituted by RGB three-color light sources.
Patent Application
20070222743
