Design Of LCD Driver With Charge Sharing Circuit

LCD (Liquid Crystal Display) technology is a voltage control through the LCD image elements of the arrangement, thus realizing the backlight control the transmission of the display technologies, is now the fastest developing, most widely used display. LCD driver is a key part of the liquid crystal display system, is the highest percentage of the cost of the chip design study is one of the hot spots, so the driver chips study has important value at theories and practical applications.In this paper, the task is to design a LCD driver circuit suitable for small-size LCD. Based on the basic operation principle of LCD system, this paper proposed the whole structure of LCD driver circuit and designed each module circuits in detail. Driver is a mixed-signal circuit, can be divided into digital and analog part. Digital part includes FIFO, serial to parallel converter, busy flag, charge sharing circuit; analog part includes Nonlinear DAC, bandgap, row driver analog module and output buffer circuit. The designed circuits are simulated, and the results show that the circuits can work well and meet the requirements.The innovations in this paper are that: 1, proposed a new charge-sharing technology, the full charge of this shared characteristics use not only the peer between pixels to charge each other, but also makes a separate line between pixels to charge each other, this technology has a high-power saving efficiency; 2, design a suitable output buffer circuit, with low static power consumption and good drive capability.