# US 12,762,993 B2 · Display driving chip

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- Number: US 12,762,993 B2
- Document ID: US12762993B2
- Status: Granted
- Kind: B2
- Application number: 19/165,946
- Filed: 2023-10-10
- Published: 2026-09-10
- Granted: 2026-10-13
- Earliest claimed: 2023-03-17
- Assignees: Lx Semicon Co., Ltd.
- Applicants: Lx Semicon Co., Ltd.
- Inventors: Young Bok Kim
- Web page: https://patentgrep.com/patent/US12762993B2

## CPC

- G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)}
- H04L 7/04: Speed or phase control by synchronisation signals {(H04L7/0075 takes precedence)}
- H04L 25/03878: {Line equalisers; line build-out devices}
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- G09G 2310/061: for resetting or blanking
- G09G 2320/041: Temperature compensation
- G09G 2330/04: Display protection
- G09G 2330/06: Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
- 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)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present invention relates to a drive chip for variably generating various types of control signals according to temperature changes so that high-quality image data can be provided to a display device, and an operation method thereof.

## Claims

### Claim 1

A display driving chip comprising:
an impedance matching circuit that matches characteristic impedance of a data channel and input impedance of the display driving chip;
an equalizer circuit that compensates for distortion of data input through the data channel;
a clock data recovery circuit that recovers an output of the equalizer circuit to match a clock signal;
a realignment circuit that converts the input data into serial data; and
a temperature control circuit including a continuous time linear equalizer circuit (CTLE) controller for adjusting an equalizing condition of an internal amplifier of the equalizer circuit in response to a temperature sensing signal, a bias controller for adjusting a bias of the internal amplifier, and an impedance controller for adjusting impedance of the impedance matching circuit.

### Claim 2 (depends on 1)

The display driving chip of claim 1, wherein the continuous time linear equalizer circuit controller further adjusts a gain of the amplifier.

### Claim 3 (depends on 1)

The display driving chip of claim 1, wherein the bias controller variably adjusts the bias of the amplifier according to a temperature change.

### Claim 4 (depends on 1)

The display driving chip of claim 1, wherein the impedance matching circuit is composed of passive elements or a combination thereof.

### Claim 5 (depends on 1)

The display driving chip of claim 1, wherein the equalizer circuit performs one or more of initial equalization performed immediately after a power voltage is applied or a power-on reset (POR) signal is input, automatic equalization performed during a vertical blank section, and optimal equalization that optimizes the automatic equalization.

### Claim 6 (depends on 1)

The display driving chip of claim 1, wherein the impedance controller is configured to variably control the input impedance of the display driving chip according to a temperature change.

### Claim 7 (depends on 1)

The display driving chip of claim 1, wherein the impedance constituting the bias of the amplifier is composed of passive elements or a combination thereof.

### Claim 8 (depends on 1)

The display driving chip of claim 1, wherein the control signals change by a constant voltage each time the operating temperature changes by 10° C.

### Claim 9 (depends on 8)

The display driving chip of claim 8, wherein the constant voltage is 10 mV.

### Claim 10 (depends on 1)

The display driving chip of claim 1, wherein voltages of the control signals continuously change as the operating temperature changes.