# US 2013/0155043 A1 · Gamma tab voltage generator

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- Number: US 2013/0155043 A1
- Document ID: US20130155043A1
- Status: Published application
- Kind: A1
- Application number: 13/478,770
- Filed: 2012-05-23
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: LG Display Co., Ltd.
- Inventors: Kyoungdon Woo; Taegung Kim; Mookyoung Hong
- Web page: https://patentgrep.com/patent/US20130155043A1

## CPC

- G09G 3/3275: Details of drivers for data electrodes
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- 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

A gamma tab voltage generator includes a plurality of, a data calculator configured to generate a buffer selection information and a buffer combination information based on a current capacity of buffer, a plurality of digital-to-analog converters configured to generate gamma tab voltages based on a gamma tab voltage information, a buffer selector configured to connect input terminals of the buffers selected based on the buffer selection information to output terminals of the digital-to-analog converters, and a buffer combiner configured to connect output terminals of the selected buffers to one another in response to the buffer combination information.

## Claims

### Claim 1

A gamma tab voltage generator comprising:
a plurality of buffers;
a data calculator configured to generate buffer selection information and buffer combination information based on a current capacity of a buffer;
a plurality of digital-to-analog converters configured to generate gamma tab voltages based on gamma tab voltage information;
a buffer selector configured to select buffers based on the buffer selection information and connect input terminals of the selected buffers to output terminals of the digital-to-analog converters; and
a buffer combiner configured to connect output terminals of the selected buffers to one another in response to the buffer combination information.

### Claim 2 (depends on 1)

The gamma tab voltage generator of claim 1, wherein the data calculator receives digital data including the gamma tab voltage information and a resistance information and calculates the current capacity of buffer based on the gamma tab voltage information and the resistance information,
wherein the data calculator generates the buffer selection information and the buffer combination information so as to select the buffers capable of obtaining the calculated current capacity of buffer.

### Claim 3 (depends on 1)

The gamma tab voltage generator of claim 1, wherein the plurality of buffers include at least first and second buffers each having a different current capacity.

### Claim 4 (depends on 3)

The gamma tab voltage generator of claim 3, wherein the gamma tab voltages include first and second gamma tab voltages each having a different value,
wherein the buffer selector supplies the first gamma tab voltage to the first buffer and supplies the second gamma tab voltage to the second buffer.

### Claim 5 (depends on 1)

The gamma tab voltage generator of claim 1, wherein the plurality of buffers include at least first to third buffers each having a different current capacity.

### Claim 6 (depends on 5)

The gamma tab voltage generator of claim 5, wherein the gamma tab voltages include first and second gamma tab voltages each having a different value.
wherein the buffer selector supplies the first gamma tab voltage to the first buffer and commonly supplies the second gamma tab voltage to the second and third buffers.

### Claim 7 (depends on 6)

The gamma tab voltage generator of claim 6, wherein the buffer combiner connects output terminals of the second and third buffers to one another.