Driving method of a display panel
A method of driving a display panel is provided which can reduce power consumption. During a unit display period, the number of times of second and subsequent selective erase operations performed on one display cell of each pixel is different from the number of times of second and subsequent selective erase operations performed on another display cell emitting light of different color from that of the one display cell.
1. A method of driving a display panel to perform grayscale display in a plurality of subfields for each unit display period, the display panel having a plurality of pixels arranged in a matrix, each pixel including a plurality of display cells emitting different color light, the method comprising:
initializing all the display cells in a lighting mode in a first subfield of the unit display period, and
performing a first selective erase operation, a second selective erase operation, and a sustain operation in the unit display period, the first selective erase operation changing the display cells from the lighting mode to a blackout mode in one subfield according to a luminance level expressed by an input video signal, the second selective erase operation changing display states of the display cells from the lighting mode to the blackout mode again in at least one of subfields subsequent to the one subfield, the sustain operation making only the display cells being in the lighting mode emit light by the number of times corresponding to the luminance weight of the subfield,
wherein in the unit display period, in one display cell of the pixel, when said luminance level is lower than a predetermined value, said second selective erase operation is performed in all of subfields from a subfield immediately after said one subfield to a last subfield, and in another display cell emitting light of a different color from that of the one display cell, when said luminance level is lower than said predetermined value, said second selective erase operation is performed only in a part of the subfields from a subfield immediately after said one subfield to said last subfield.
2. The method of driving a display panel according to claim 1 ,
wherein the display cells in the pixel are disposed to be adjacent to one another on the same display line, and
said one display cell is a display cell for a color with a relatively low luminance level and said another display cell emitting light of a different color from that of said one display cell is a display cell for a color with a high luminance level.
3. The method of driving a display panel according to claim 2 ,
wherein the display cells in the pixel are a red display cell for red light emission, a green display cell for green light emission, and a blue display cell for blue light emission, and
the display cell for a color with a relatively low luminance level is the blue display cell, and the display cell for a color with a high luminance level is at least one of the red display cell and the green display cell.
4. The method of driving a display panel according to claim 1 ,
wherein the display cells maintain the lighting mode in each of subfields arranged between the first subfield and the one subfield.