# US 2010/0164933 A1 · Lcd source driver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164933 A1 - Document ID: US20100164933A1 - Status: Published application - Kind: A1 - Application number: 12/634,815 - Filed: 2009-12-10 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Inventors: Sang-Hoon Lim; Tae-Woon Kim; Shin-Young Yi; Jin-Seok Koh - Web page: https://patentgrep.com/patent/US20100164933A1 ## CPC - H03M 3/502: {Details of the final digital/analogue conversion following the digital delta-sigma modulation} - G09G 3/3688: {suitable for active matrices only} - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract An LCD source driver may include a digital-to-analog converter including a sampling capacitor to sample, according to a signal, at least one of a first voltage and a second voltage. The LCD source driver may also include a reconstruction filter in which capacitance applied from the sampling capacitor according to the signal and capacitance of an integral capacitor for holding a previous output voltage are connected in parallel. ## Claims ### Claim 1 A liquid crystal display source driver comprising: a digital-to-analog converter including a sampling capacitor to sample, according to a signal, at least one of a first voltage and a second voltage; and a reconstruction filter in which capacitance applied from the sampling capacitor according to the signal and capacitance of an integral capacitor for holding a previous output voltage are connected in parallel. ### Claim 2 (depends on 1) The liquid crystal display source driver of claim 1, wherein the first voltage is a source voltage. ### Claim 3 (depends on 1) The liquid crystal display source driver of claim 1, wherein the second voltage is a ground voltage. ### Claim 4 (depends on 1) The liquid crystal display source driver of claim 1, wherein the a digital-to-analog converter is a 1-bit digital-to-analog converter. ### Claim 5 (depends on 1) The liquid crystal display source driver of claim 1, wherein the first voltage and the second voltage are each connected to the sampling capacitor by a switch controlled by the signal. ### Claim 6 (depends on 1) The liquid crystal display source driver of claim 1, wherein the reconstruction filter includes a third switch connected between the sampling capacitor and the output of an operational amplifier. ### Claim 7 (depends on 6) The liquid crystal display source driver of claim 6, wherein the reconstruction filter includes a fourth switch connected between the sampling capacitor Cs and a first input of the operational amplifier. ### Claim 8 (depends on 7) The liquid crystal display source driver of claim 7, wherein the reconstruction filter includes a fifth switch connected between the sampling capacitor Cs and ground. ### Claim 9 An liquid crystal display source driver comprising: a digital-to-analog converter including a sampling capacitor to sample, according to a signal, at least one of a first voltage and a second voltage; and a reconstruction filter configured to select a reference signal using some M bits of N bits, when N bits are implemented, and to perform digital-to-analog conversion using a delta-sigma conversion method using the remaining N-M bits. ### Claim 10 (depends on 9) The liquid crystal display source driver of claim 9, wherein the first voltage is a source voltage. ### Claim 11 (depends on 9) The liquid crystal display source driver of claim 9, wherein the second voltage is a ground voltage. ### Claim 12 (depends on 9) The liquid crystal display source driver of claim 9, wherein the M bits are smaller than the N-M bits. ### Claim 13 (depends on 9) The liquid crystal display source driver of claim 9, wherein the output voltage of the reconstruction filter is precharged to the reference voltage. ### Claim 14 (depends on 9) The liquid crystal display source driver of claim 9, wherein the reference voltage is adjusted according to the M bits. ### Claim 15 (depends on 9) The liquid crystal display source driver of claim 9, wherein the output voltage of the reconstruction filter is output at a voltage level corresponding to the N-M bits on the basis of the reference voltage. ### Claim 16 (depends on 9) The liquid crystal display source driver of claim 9, wherein the a digital-to-analog converter is a 1-bit digital-to-analog converter. ### Claim 17 (depends on 9) The liquid crystal display source driver of claim 9, wherein the first voltage and the second voltage are each connected to the sampling capacitor by a switch controlled by the signal. ### Claim 18 (depends on 9) The liquid crystal display source driver of claim 9, wherein the reconstruction filter includes a third switch connected between the sampling capacitor and the output of an operational amplifier. ### Claim 19 (depends on 18) The liquid crystal display source driver of claim 18, wherein the reconstruction filter includes a fourth switch connected between the sampling capacitor Cs and a first input of the operational amplifier. ### Claim 20 (depends on 7) The liquid crystal display source driver of claim 7, wherein the reconstruction filter includes a fifth switch connected between the sampling capacitor Cs and ground.