KR970022926A - Common / Segment Driving Circuit of LCD - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common / segment driving circuit of a small and medium-sized liquid crystal display device having the same electrical characteristics and the same functions as the conventional driving circuit, and having a smaller integrated circuit area than that of the conventional driving circuit.

The common / segment driving circuit of the small and medium-sized liquid crystal display of the present invention includes a level converting unit for inputting an input data input signal, an M signal, and a common / segment selection signal to produce a signal having the same level as the operating voltage of the output circuit; A selector for selecting the output level of the common / segment according to the output signal of the level converter and an output unit for outputting one of the common / segment output levels selected according to the output signal of the selector.

Description

Common / Segment Driving Circuit of LCD

As this is a public information case, the full text was not included.

2 is a common / segment driving circuit diagram of a small and medium-sized liquid crystal display according to an exemplary embodiment of the present invention.

Claims (9)

First to fourth level shifters LS11-LS14 for inputting the data input signal D, the M signal, and the common / segment selection signal CS_SEL to make a signal having the same level as the operating voltage of the output circuit. The level converting section 10, the selection section 20 for selecting the output level of the common / segment according to the output signal of the level converting section 10, and the common / selected section according to the output signal of the selecting section 20. A common / segment drive circuit of a liquid crystal display device comprising an output section (30) for outputting one of the segment output levels. 2. The selector of claim 1, wherein the selector 20 includes first and second P-type MOS transistors HP11 and HP12 and first and second N-type MOS transistors HN11 and HN12 to select the common / segment V0 output level. A first selection means for outputting a signal to the output unit 30, and third and fourth P-type MOS transistors HP13 and HP14 and third and fourth N-type MOS transistors HN13 and HN14. Second selection means for outputting a signal for selecting the V1 output level to the output unit 30, fifth and sixth P-type MOS transistors HP15 and HP16, and fifth and sixth N-type MOS transistors HN15 and HN16. Third selection means for outputting a signal for selecting the V2 output level of the segment to the output unit 30, and the seventh and eighth P-MOS transistors HP17 and HP18 and the seventh and eighth N-MOS transistors. Comprising transistors HN17 and HN18 to output a signal for selecting the V3 output level of the segment to the output unit 30. The output unit 30 includes a fourth selection means, ninth and 10P MOS transistors HP19 and HP2O, and ninth and 10N MOS transistors HN19 and HN2O to select a common V4 output level. And a fifth selecting means for outputting the same, and the V11 output level of the common / segment comprising the 11th and 12P MOS transistors HP2l and HP22 and the 11th and 12P MOS transistors HN2l and HN22. 6. A common / segment driving circuit of a liquid crystal display device, characterized in that it comprises a sixth selecting means for outputting a signal. The first and second selection means for selecting the V0 output level of the common / segment is provided with gates of the first and second P-type MOS transistors HP11 and HP12, respectively. First outputs DD and MCS are applied to the gates of the first and second N-type MOS transistors HN11 and HN12, respectively, and the first outputs DD and MLS of the first and third level shifters LS11 and LS13 are respectively applied. MCS) is applied to the common / segment driving circuit of the liquid crystal display device. The second selecting means for selecting the common V1 output level is a gate of the third and fourth P-type MOS transistors HP13 and HP14, respectively, and the first output C_S of the second level shifter LS12. ) And the second output DB of the first level shifter LS11 are applied, and the first output C_S of the second level shifter LS12 is respectively applied to the gates of the third and fourth N-type MOS transistors HN13 and HN14. ) And a second output DB of the first level shifter LS11 are applied to the common / segment driving circuit of the liquid crystal display. 3. The third selecting means according to claim 2, wherein the third selecting means for selecting the V2 output level of the segment includes the second output C_SB of the second level shifter LS12 at the gates of the fifth and sixth P-type MOS transistors HP15 and HP16, respectively. ) And the second output DB of the first level shifter LS11 are applied, and the second output C_SB of the second level shifter LS12 is respectively connected to the gates of the fifth and sixth N-type MOS transistors HN15 and HN16. ) And a second output DB of the first level shifter LS11 are applied to the common / segment driving circuit of the liquid crystal display. The fourth selecting means for selecting the V3 output level of the segment comprises: a first output C_S of the second level shifter LS12 at the gates of the seventh and eighth P-MOS transistors HP17 and HP18, respectively. ) And the first output DD of the first level shifter LS11 are applied, and the first output C_5 of the second level shifter LS12 is respectively applied to the gates of the seventh and eighth NMOS transistors HN17 and HN18. ) And a second output DD of the first level shifter LS11 are applied to the common / segment driving circuit of the liquid crystal display. The second selecting means for selecting the common V4 output level is a second output C_SB of the second level shifter LS12 at the gates of the ninth and first OP type MOS transistors HP19 and HP2O, respectively. ) And the first output DD of the first level shifter LS11 are applied, and the second output C_SB of the second level shifter LS12 is applied to the gates of the ninth and 10N-type MOS transistors HN19 and HN2O, respectively. ) And a first output DD of the first level shifter LS11 are applied to the common / segment driving circuit of the liquid crystal display. The sixth selection means for selecting the V5 output level of the common / segment is a second output of the first level shifter LS1l at the gates of the eleventh and 12P type MOS transistors HP21 and HP22, respectively. (DB) and the first output MCS of the third level shifter LS13 are applied, and the second output of the first level shifter LS11 is applied to the gates of the eleventh and twelfth NMOS transistors HN2l and HN22, respectively. (DB) and the first output MCS of the third level shifter LS13 are applied to the common / segment driving circuit of the liquid crystal display device. The 13P-type MOS transistor of claim 1, wherein the output unit 30 is driven by an output signal of the first selecting unit of the selector 20 to output a common / segment output level VO to the output terminal OUT. (HP23), a 14P type MOS transistor HP24 which is driven by the output signal of the second selecting means of the selecting section and outputs the common output level V1 to the output terminal OUT, and the output of the third selecting means of the selecting section. A 15P type MOS transistor HP25 which is driven by a signal and outputs the segment output level V2 to the output terminal OUT, and a segment output level to the output terminal OUT by being driven by an output signal of the fourth selecting means of the selecting section. 13N-type MOS transistor HN23 which outputs V3, and 14N-type MOS transistor HN24 which is driven by the output signal of the 5th selection means of a selection part, and outputs the common output level V4 to the output terminal OUT. ) And the output signal of the sixth selecting means of the selecting section To the output terminal (OUT) to the common / segment driving circuit of a liquid crystal display device, characterized in that formed in a 15N-type MOS transistor (HN25) for outputting a common / segment output level (V5). ※ Note; Disclosure based on original application.