Reference will now be made to the drawing to describe the present invention in detail.
The source driver circuit 16 produces a plurality of gray scale voltages in order to drive the plurality of data lines 22. The gate driver circuit 15 receives a plurality of high-level gate voltages (VGHs) or low-level gate voltages (VGLs). The plurality of VGHs or VGLs turn on or turn off the corresponding TFTs 23 via the corresponding scan lines 21. Normally, a value of the VGH is +15.x V (volts) or +24.x V, wherein x is any natural number; and a value of the VGL is −10.x V or −6.x V, wherein x is any natural number. For example, the VGH may be 15.3 V (when x=3), and the VGL may be 10.2 V (when x=2).
The DC-DC converter 130, the pulse width modulation circuit 150, and the gamma circuit 160 are packaged in the decoder circuit 13, the gate driver circuit 15, and the source driver circuit 16 respectively. This can be achieved via a multiple chip packaging method.
The DC-DC converter 130 receives a direct current (DC) voltage in a range of +5 V to +12 V from an external power source (not shown), and converts the DC voltage into an operating voltage. The operating voltage is supplied to the decoder circuit 13, the timing control circuit 14, the gate driver circuit 15, and the source driver circuit 16, respectively. A range of the operating voltage is from +2.7 V to +3.6 V; for example, +3.3 V. The timing control circuit 14 generates timing control signals to control the timing sequence of the gate driver circuit 15 and the source driver circuit 16. The pulse width modulation circuit 150 produces VGHs, VGLs, and AVDDs. The VGHs and VGLs are provided to the gate driver circuit 15, and the AVDDs are provided to the source driver circuit 16 as well as the gamma circuit 160. The gamma circuit 160 produces gamma voltages, and provides the gamma voltages to the source driver circuit 16.
The pulse width modulation circuit 150 is packaged in the gate driver circuit 15, and the VGHs and the VGLs are directly provided to the gate driver circuit 15. The gamma circuit 160 is packaged in the source driver circuit 16, thus the gamma voltages are directly provided to the source driver circuit 16. That is, conductive lines normally needed in the associated LCD panel can be omitted. Consequently, the circuit configuration of the driving system 100 is relatively simple.
The FPC only needs a single pin for providing the +3.3 V operation voltage. Thus the cost of the FPC is reduced.
In alternative embodiments, the timing control circuit 14 can be packaged in the decoder circuit 13, or in the source driver circuit 16.
It is to be understood, however, that even though numerous characteristics and advantages of the preferred embodiments have been set out in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only; and that changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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95127762 | Jul 2006 | TW | national |