Control signal generation circuit

Abstract

A control signal generation circuit includes a switch tube T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T12, the source terminal of the T1 is connected with an FW driving voltage, a control terminal is connected with a driving voltage of an upper level gate, the source terminal of the T2 is connected with a BW driving voltage, a control terminal is connected with a driving voltage of a lower level gate, the drain ends of T1 and T2 are connected to each other and connected to the control terminals of the switch tubes T3 and T4, the source of T4 is connected to the second clock drive signal, a leakage terminal is connected with that driving voltage of the gate of the current stage, the source terminal of T3 is also connected to the control terminal of T5, the source terminal of T5 is connected with the control terminal of T3, the control terminal of T5 is also connected with the control terminal of T6, the control terminal of T6 is connected with the third clock driving signal, the source terminal of T6 is connected with the current gate driving voltage, and the source terminal of T7 is also connected with the drain terminal of T3, t5, t6 and T7 pairs are connected with the panel low working voltage VGL. The above design can achieve a more stable Em driving signal which meets the driving requirements.

Description

technical field [0001] The invention relates to the field of liquid crystal panel display, in particular to a circuit design for eliminating display unevenness of a liquid crystal panel. Background technique [0002] Organic light emitting diodes (Organic Light Emitting Diode, OLED) can be divided into passive matrix driving (Passive Matrix OLED, PMOLED) and active matrix driving (Active Matrix OLED, AMOLED) according to the driving method. Among them, the PMOLED does not emit light when data is not written, but only emits light during data writing. This driving method is simple in structure, low in cost, and easy to design, and is mainly suitable for small and medium-sized displays. [0003] AM stands for Active Matrix, which is relative to Passive Matrix, and refers to the driving method of each OLED pixel. In Passive Matrix, the control of each pixel is realized through a complex electrode network, so as to realize the charge and discharge of a certain pixel. Generally ...

AI Technical Summary

Problems solved by technology

Considering that the VDD metal line itself has impedance, there will be a voltage drop, resulting in a difference in the VDD of each pixel, resulting in a current difference between different pixels

In this way, different currents flowing through the OLED will produce different brightness, and thus the AMOLED panel will be uneven.

In addition, due to the influence of the manufacturing process, the threshold voltages of the thin film transistors in each pixel are not the same. Even if the voltage Vdata of the same value is provided, the current generated by them will still be different, which will also cause uneven panels.

Therefore, OLED pixel drive circuits with compensation circuit structures are commonly used in mass products at present, but the requirements for GIP driving using compensation circuits are becoming more and more complicated. It not only requires Scan GIP circuits (that is, the GIP circuits in LCDs), but also requires Em drive circuit, compared with Scan circuit, Em circuit has higher requirements for design

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