Digital-to-analogue conversion circuit and method, source driver and display device

Abstract

The embodiment of the invention relates to a digital-to-analogue conversion circuit and method, a source driver and a display device. The digital-to-analogue conversion circuit includes a first digital-to-analogue conversion device and a second digital-to-analogue conversion device, wherein the first digital-to-analogue conversion device corresponds to high-bit m digits of a (m+2)-bit digital signal, the second digital-to-analogue conversion device corresponds to low-bit n digits, and the m and the n are both integers greater than zero. The first digital-to-analogue conversion device includes a voltage division module, a first voltage selecting module and an operation module, wherein the voltage division module is used for generating 2<m> reference voltages which have an equal gap voltage, the first voltage selecting module is used for selecting first voltages corresponding to the m digits from the 2<m> reference voltages, the operation module is used for generating second voltages from two adjacent reference voltages in the 2<m> reference voltages and the first voltages, and the gap voltage of the second voltages is greater than that of the first voltages. The second digital-to-analogue conversion device is used for using the first voltages and the second voltages as reference voltages, generating third voltages corresponding to the n digits and generating the sums of the third voltages and the first voltages.

Description

technical field [0001] Embodiments of the present invention relate to the field of electronic circuits, in particular to a digital-to-analog conversion circuit and method, a source driver and a display device. Background technique [0002] Organic light-emitting diode (OLED), as a current-mode light-emitting element, has become the mainstream display element in current display devices due to its thinness, fast response speed, and high contrast. According to the driving method, OLED can be divided into passive matrix driven OLED (PMOLED) and active matrix driven OLED (AMOLED). AMOLED has the advantages of short driving time, low power consumption, and wide viewing angle, so it is more and more used in TVs, flat panels and other devices. [0003] With the development of high-definition display technology, the requirements for digital-to-analog conversion (DAC) performance in video processors are also getting higher and higher, usually requiring more than 10 bits (bit). At pr...

AI Technical Summary

Problems solved by technology

In general digital technology, the resistor divider can only reach about 8 bits.

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