Abstract
In this paper, a new low-power technology based on gaze tracking, called peripheral dimming, is proposed for organic light-emitting diode (OLED) displays. The goal of the proposed method is to save power without degrading the perceptual image quality. In the proposed method, the peripheral vision area on the screen is gradually darkened depending on the distance from the gaze point. In this work, quantitative conditions for preventing degradation of the perceived image quality are studied through a psychophysical experiment by using three video clips. We suggest a lightness reduction ratio (LRR) that determines the amount of reduced luminance per viewing angle based on the lightness. Four conditions of the LRR from 0.1 to 1.0%/degree are applied to each clip. The experiment is designed based on a two-alternative forced choice: a test clip with the proposed method is compared to the original one, and subjects are forced to choose the brighter clip between the two clips shown in random order. In this way, the threshold of the LRR from which people begin to notice a difference between the test and original clips is obtained. The experimental results demonstrate that the proposed method saves the power of OLED displays up to 34.4% while keeping the image quality high in terms of both subjective and objective quality (the mean structural similarity index is higher than 0.94). Therefore, the proposed method will help to enable low-power operation of OLED displays used for head-mounted display devices while maintaining the quality of experience.
Highlights
An organic light-emitting diode (OLED) display is a representative self-luminous display
This paper proposes a new low-power technology based on gaze tracking, called peripheral dimming
Peripheral dimming saves power consumption by reducing the luminance of the area that corresponds to the peripheral vision area
Summary
An organic light-emitting diode (OLED) display is a representative self-luminous display It has many advantages over liquid crystal displays (LCDs) in terms of viewing angle, color gamut, response speed, thickness, and so on [1]-[3]. The luminance of an OLED is determined by the electric current flowing through it [4] This means that power consumption could be reduced by limiting the luminance. The power consumed by a pixel of the OLED display is proportional to the linear RGB values [19]. According to the previous study [20], the power consumption in a pixel of the OLED display panel can be modeled by Pdisplay = f (R) + f (G) + f (B) + C (1). The power consumption of each subpixel is expressed as follows:
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