Compact and efficient RGB to RGBW data conversion method and its application in OLED microdisplays

Abstract

In many electronic information displays, a colour pixel comprises three spatially distinct sub‐pixels containing red, green and blue (RGB) colour filters. The option of adding a fourth white (W) sub‐pixel that allows light to pass through unfiltered can significantly improve the optical efficiency of the pixel that, in turn, increases the power efficiency of the display. Such a display is called an RGBW display, and the required transformation of data format from incoming RGB to pixel RGBW is termed as “RGB to RGBW conversion.” This paper reports a method of RGB to RGBW conversion that is highly compact and efficient in terms of system resources while retaining image quality. It processes incoming data through a new colour space conversion algorithm in order to reduce the average power consumption with no noticeable visual artefacts. We explain the method and demonstrate its cost‐effective and power‐effective implementation for the specific case of an organic light emitting diode microdisplay.

Novel Strategy for Photopatterning Emissive Polymer Brushes for Organic Light Emitting Diode Applications

“…2 , 46 These small feature sizes are of particular interest for microdisplay applications, where decreasing pixel dimensions are required to enhance image resolution. 18 , 47 − 49 …”

“…Given the superior spatial control achieved during polymer brush growth, this approach was used for all subsequent studies. Moreover, this methodology can be used to provide polymer brush patterns with resolution down to the micron level (Figures c and S19), outcompeting state-of-the-art pixels achieved via evaporative deposition (∼5 × 5 μm 2 ). , These small feature sizes are of particular interest for microdisplay applications, where decreasing pixel dimensions are required to enhance image resolution. ,− …”

A digitally driven pixel circuit with current compensation for AMOLED microdisplays

“…Microdisplays have attracted increasing attention for applications in emerging portable electronics and wearable computers, such as head-mounted displays, wristwatches, and microprojectors. [1][2][3] Microdisplays constructed with activematrix organic light-emitting diodes (AMOLED) show advantages in small size, light weight, wide viewing angle, high contrast ratio, low power, and broad temperature range. 4 Most organic light-emitting diode (OLED) displays are fabricated on amorphous silicon (a-Si) or polycrystalline silicon (p-Si) substrates with thin film transistor circuits.…”