Image display apparatus and video wall including the same

An image display apparatus comprising:

• a panel having a plurality of light emitting diodes;
• and
• a driving controller configured to output a scan signal to the plurality of light emitting diodes during each of a plurality of subframe periods,
• wherein, in response to a gray level of a frame being below a predetermined level, the driving controller outputs a data signal based on pulse amplitude modulation to the light emitting diodes while dividing the gray level of the frame and distributing the divided gray level across at least part of the subframes,
• wherein the plurality of light emitting diodes include a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and,
• wherein in response to the gray level of a frame including a plurality of subframes being a first level below the predetermined level, the driving controller is configured to control a number of subframes during which the red light emitting diode emits light to be less than or equal to a number of subframes during which the green light emitting diode or the blue light emitting diode emits light.

A video wall comprising a plurality of image display apparatuses,

• wherein the image display apparatus comprises:
• a panel with a plurality of light emitting diodes;
• and
• a driving controller configured to output a scan signal to the plurality of light emitting diodes during each of a plurality of subframe periods,
• wherein, in response to a gray level of a frame including a plurality of subframes being above a predetermined level, the driving controller outputs a data signal based on pulse width modulation to the light emitting diodes, and
• in response to the gray level of the frame being below the predetermined level, the driving controller outputs a data signal based on pulse amplitude modulation to the light emitting diodes while dividing the gray level of the frame and distributing the divided gray level across at least part of the subframes,
• wherein, in response to the gray level of the frame being below the predetermined level, the driving controller is configured to control a second non-light emission period set after performing the pulse amplitude modulation to be shorter than a first non-light emission period set before performing the pulse amplitude modulation,
• wherein a level of a data signal outputted by the driving controller when the gray level of the frame is below the predetermined level is less than a level of a data signal outputted by the driving controller when the gray level of the frame is above the predetermined level.