Patent ID: 8629821

Claim:
A display device, comprising: a liquid crystal display panel including a plurality of pixels each having one or more sub-pixels; and control electronics configured to provide, in response to image data, signal voltages to the pixels in a first mode whereby an on-axis viewer and an off-axis viewer perceive substantially a same main image, and signal voltages to the pixels in a second mode whereby the on-axis viewer perceives the main image and the off-axis viewer perceives a side image different from the main image; wherein in the first mode the signal voltages provided to the pixels result in a luminance among a group of the sub-pixels, and in the second mode the signal voltages provided to the pixels result in the luminance redistributed among the group of sub-pixels, an average luminance among the group of sub-pixels in the second mode being substantially proportional to an average luminance among the group of sub-pixels in the first mode with respect to the on-axis viewer, regardless of a degree of redistribution, and substantially varying with the degree of redistribution with respect to the off-axis viewer, and the control electronics is further configured to compensate for a temporal change in the average luminance among the sub-pixel pairs in the second mode due to a difference in electro-optical response of the sub-pixels within the group of sub-pixels as a result of a change in the degree of luminance redistribution, by adding a compensation value to the signal voltages to underdrive or overdrive one or more of the sub-pixels within the group of sub-pixels.