Effective thermal management is essential to engineering organic devices, since heating accelerates their degradation. However, as pixels in organic light-emitting diode (OLED) displays continue to shrink, an important tool for thermal management, infrared thermography, approaches the limits of its spatial resolution. To address this problem, we adapt highresolution thermoreflectance imaging, which measures minute changes in reflectivity of visible light, to map temperature in a commercial OLED display. We identify a slowly varying thermal signal and find strong evidence of thermal crosstalk, in which a biased pixel heats up its nearest neighbors, even when the neighbors are unbiased. Such crosstalk is indicative of insufficient heat dissipation, which can lead to reduced display lifetime