Control device and control method for image display

A control device of an image display, comprising:

• a first reference point and a second reference point configured to generate the light of a predetermined spectrum;
• a modulation unit configured to modulate the light generated by the first reference point with a first cycle and the light generated by the second reference point with a second cycle, wherein the modulation unit is configured to control the first reference point to emit the light with a first brightness within a first period of the first cycle and to emit the light with a second brightness within a second period of the first cycle, and the modulation unit is configured to control the second reference point to emit the light with a third brightness within a third period of the second cycle and to emit the light with a fourth brightness within a fourth period of the second cycle;
• and
• a remote controller configured to capture the light of the predetermined spectrum with a sampling cycle and demodulate an image variation of the first and second reference points with respect to the remote controller;
• wherein the first brightness, the second brightness, the third brightness and the fourth brightness are not zero gray level.

A control method for an image display, comprising the steps of:

• providing a first reference point and a second reference point to generate the light of a predetermined spectrum;
• modulating the light generated by the first reference point with a first cycle so that the first reference point emits the light with a first brightness within a first period of the first cycle and emits the light with a second brightness within a second period of the first cycle;
• modulating the light generated by the second reference point with a second cycle so that the second reference point emits the light with a third brightness within a third period of the second cycle and emits the light with a fourth brightness within a fourth period of the second cycle;
• and
• providing a remote controller to capture the light of the predetermined spectrum with a sampling cycle and demodulate an image variation of the first and second reference points with respect to the remote controller;
• wherein the first brightness, the second brightness, the third brightness and the fourth brightness are not zero gray level.