P‐1.8: External Compensation for TFT Vth&Mobility Using Linear Charge Sense Method in AMOLED Display

Abstract

A new method for Sense and Calculate TFT characteristics is simulated with 3T1C structure of AMOLED display. By using data programming compensation, it can correct both Vth and Mobility. The proposed method uses Linear Charging Method which has faster charging speed than Source Follower Method. By increasing the Vgs of driving TFT, we can even reduce the charging time to 0.5ms. And fast charging make it possible to achieve real‐time detection in higher and higher resolution display. The principle of the method will be described in detail and giving out the simulation data. The experiments are carried out in a 31‐inch AMOLED panel.

Novel Active-Matrix Micro-LED Display With External Compensation Featuring Fingerprint Recognition

“…2(a). The proposed circuit comprises four transistors and one capacitor (4T1C) whereas the conventional external compensation circuit is composed of 3T1C [13,14]. When a finger is placed on the display screen, the pixels under the finger don't need to emit light related to image data.…”

“…Although it is a simple method to compensate for VTH, poor compensation performance for low gray levels and the reduced aperture ratio due to too many TFTs are unavoidable. On the other hand, in the case of external compensation, the VTH shift can be compensated by the external circuit [9][10][11][12][13][14]. This method requires fewer TFTs.…”

A Novel Real-Time TFT Threshold Voltage Compensation Method for AM-OLED Using Double Sampling of Source Node Voltage

“…This article proposes a compensation method can be carried out within a vertical blank. Many studies about real-time V th compensation have been conducted such as fast methods using iterative feedback [13], linear charging method [18], and current sensing [19]. However, these methods take more than the vertical blank time of the latest display products, or the non-uniform mobility is not considered.…”

P‐15: Student Poster: Reliable Gate Driver for Real‐Time External Compensated AMOLED Display Using InGaZnO TFTs

“…For external compensation method, both display scanning output and sensing output are required [4] [5]. However, the traditional gate driver can only generate display scanning signals.…”