Lcd driver ic

The device sizes used in the proposed column driver. Photograph of the proposed column driver. This deviation is mainly due to process variations.

The approach in this study uses no error correction. Hence, the deviation can be reduced by applying an offset canceling technique to the buffer amplifier. Figures 15 a and b show the DNL values for positive and negative polarities, respectively. Figures 16 a and b show the INL values for positive and negative polarities, respectively.

This study uses a 1-LSB voltage of 2. The linearity, however, is less important than the deviations between off-chip drivers for LCD drivers [ 2 ]. The measured output responses of column drivers for 8 chips. The measured DNL for a positive polarity b negative polarity of the proposed column driver. The measured INL for a positive polarity b negative polarity of the proposed column driver.

Table II summarizes the performance of the proposed column driver IC. The average area per channel is 0. Performance summary of the proposed column driver. This design uses external reference voltages and unequal resistor values in the resistor string to make coarse gamma correction. A simple digital circuit built into the timing controller or the column driver makes fine compensation adjustments.

These features decrease the die area and increase effective resolution. The average die area per channel is 0. The maximum deviation from the channel mean is 3. This deviation can be further reduced by employing an offset canceling technique in the buffer amplifier.

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Downloaded: Introduction With the rapid evolution of liquid crystal display LCD television TV , there is a large demand for developing high resolution, high color depth driver integrated circuits ICs [ 1 - 3 ].

Data converter scheme This study utilizes a piecewise linear compensation mechanism in the proposed column driver to reduce the die area and increase the resolution for a higher color depth display.

Data converter The DAC includes a coarse section and a fine section to reduce both the die area and the data conversion time. Output buffer To drive the data lines of the LCD panel, each channel needs an output buffer. Column driver architecture Figure 10 shows a block diagram of the LCD column driver based on the data conversion scheme above.

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