Abstract
In this paper, a temperature compensation method is proposed for active-matrix organic light-emitting diode (AMOLED) displays to achieve high luminance uniformity over a wide operating temperature range. The proposed temperature compensation method compensates for variation in OLED luminance according to temperature by adjusting the gamma voltages. To verify the proposed method, a built-in test circuit, which includes temperature sensors, current calculation block, current adjustment block, and gamma voltage generator, was fabricated using 90 nm complementary metal-oxide semiconductor process technology with 6 V high-voltage devices. The measurement results show that the proposed method achieves a high luminance uniformity with an OLED luminance variation of less than 1.54 cd/m 2 over the temperature range of -45°C to 60°C. Therefore, the proposed temperature compensation method is suitable for AMOLED displays requiring high luminance uniformity.
Highlights
Active matrix organic light-emitting diode (AMOLED) displays have been widely used for small mobile devices including smartphones, smartwatches, head-mounted displays, and smart glasses to large-sized televisions
MEASUREMENT RESULTS To verify the proposed temperature compensation method, a built-in test circuit implemented in a test chip for OLEDoS
The built-in test circuit occupies an area of 1180 × 1800 μm2, excluding the temperature sensors, which are located at the four corners of the pixel array in the test chip
Summary
Active matrix organic light-emitting diode (AMOLED) displays have been widely used for small mobile devices including smartphones, smartwatches, head-mounted displays, and smart glasses to large-sized televisions. A temperature compensation method is proposed for AMOLED displays to achieve high luminance uniformity over a wide operating temperature range. The proposed temperature compensation method compensates for variation in the OLED luminance according to the temperature by adjusting the gamma voltages.
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