# US 11,309,890 B1 · Pre-emphasis circuit, method and display device

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- Number: US 11,309,890 B1
- Document ID: US11309890B1
- Status: Granted
- Kind: B1
- Application number: 17/431,622
- Filed: 2021-05-24
- Granted: 2022-04-19
- Earliest claimed: 2020-12-14
- Assignees: Beijing ESWIN Computing Technology Co., Ltd.; Hefei ESWIN IC Technology Co., Ltd.
- Applicants: Beijing ESWIN Computing Technology Co., Ltd.; Hefei ESWIN IC Technology Co., Ltd.
- Inventors: Sangmin Park; Jangjin Nam
- Web page: https://patentgrep.com/patent/US11309890B1

## CPC

- H03K 19/0175: Coupling arrangements; Interface arrangements (interface arrangements for digital computers G06F3/00, G06F13/00)
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2310/0289: Details of voltage level shifters arranged for use in a driving circuit
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- 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

The present disclosure provides a pre-emphasis circuit, method and display device, and belongs to a field of display driving. The pre-emphasis circuit according to the disclosure can determine whether to output a pre-emphasis voltage corresponding to grayscale of current input data via an input terminal of an amplifier according to data input to a data terminal by adding an amplifier input pre-emphasis module. Rapid conversion of output voltage can be realized without increasing the quiescent current of the amplifier, while the stability of temperature of the IC is ensured.

## Claims

### Claim 1

A pre-emphasis circuit, comprising:
a first latch configured to receive and store first data and output the first data;
a second latch configured to receive and store second data and output the second data, the second data being next to the first data;
a decoder;
a gamma voltage supplier;
a first level shifter configured to boost the first data, high-voltage data signal obtained through the boosting being used as current input data of the decoder; and
an amplifier input pre-emphasis module connected to the gamma voltage supplier, the decoder, an input pre-emphasis signal terminal, the first latch and the second latch, and configured to determine whether to pre-emphasize gray-scale voltage corresponding to the current input data according to a value of a designated bit of the first data and a value of a designated bit of the second data, an input pre-emphasis signal value input via the input pre-emphasis signal terminal, and a gray-scale value corresponding to the current input data;
wherein, if it is determined that the gray-scale voltage corresponding to the current input data is to be pre-emphasized, a pre-emphasis voltage is output to the decoder, the pre-emphasis voltage being a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data; and
if it is determined that the gray-scale voltage corresponding to the current input data is not to be pre-emphasized, the gray-scale voltage corresponding to the current input data is output to the decoder.

### Claim 2 (depends on 1)

The pre-emphasis circuit according to claim 1, wherein the amplifier input pre-emphasis module comprises:
a pattern detection module connected to the first latch and the second latch, configured to determine whether to pre-emphasize the gray-scale voltage corresponding to the current input data according to the value of the designated bit of the first data, the value of the designated bit of the second data and the input pre-emphasis signal values, and output a control signal; and
a pre-emphasis module connected to an output terminal of the pattern detection module, an output terminal of the gamma voltage supplier and an input terminal of the decoder, configured to determine whether to pre-emphasize the gray-scale voltage corresponding to the current input data according to the control signal provided by the pattern detection module and the gray-scale value corresponding to the current input data.

### Claim 3 (depends on 2)

The pre-emphasis circuit according to claim 2, wherein the pattern detection module comprises an XOR gate circuit, an AND gate circuit, a D flip-flop and a second level shifter, and
wherein an input terminal of the XOR gate circuit is connected to the first latch and the second latch, and the XOR gate circuit is configured to determine whether the value of the designated bit of the first data is equal to the value of the designated bit of the second data, and output a result of the determination;
an output terminal of the XOR gate circuit is connected to a D terminal of the D flip-flop, an input terminal of the AND gate circuit is connected to a Q terminal of the D flip-flop, another input terminal of the AND gate circuit is connected to the input pre-emphasis signal terminal, and the AND gate circuit is configured to determine whether it is possible to pre-emphasize the gray-scale voltage corresponding to the current input data according to the result of the determination of the XOR gate circuit and the input pre-emphasis signal value;
when the value of the designated bit of the first data is not equal to the value of the designated bit of the second data, and the input pre-emphasis signal value is 1, a determination result that it is possible to pre-emphasize the gray-scale voltage corresponding to the current input data is obtained and output;
when the value of the designated bit of the first data is equal to the value of the designated bit of the second data, or the input pre-emphasis signal value is 0, a determination result of unnecessarily pre-emphasizing the gray-scale voltage corresponding to the current input data is obtained and output; and
the second level shifter is connected to an output terminal of the AND gate circuit and configured to provide the control signal to the pre-emphasis module.

### Claim 4 (depends on 1)

The pre-emphasis circuit according to claim 1, wherein the value of the designated bit of the first data and the value of the designated bit of the second data comprises:
a value D1<x> of an x-th bit of the first data, and a value D2<x> of an x-th bit of the second data.

### Claim 5 (depends on 4)

The pre-emphasis circuit according to claim 4, wherein the x-th bits are respective most significant bits of the first data and/or the second data.

### Claim 6 (depends on 2)

The pre-emphasis circuit according to claim 2, wherein
the gamma voltage supplier comprises a plurality of different gray-scale voltage output terminals, and the decoder comprises a plurality of gray-scale voltage input terminals corresponding to the different gray-scale voltage output terminals;
the pre-emphasis module comprises n sub-control modules, n≥1, and each of the sub-control modules is connected between a designated gray-scale voltage output terminal and a designated gray-scale voltage input terminal and is configured to perform a pre-emphasis control on the output designated gray-scale voltage.

### Claim 7 (depends on 6)

The pre-emphasis circuit according to claim 6, wherein each of the sub-control modules comprises a first switch and a second switch;
an end of the first switch is connected to the designated gray-scale voltage output terminal of the gamma voltage supplier, and another end of the first switch is connected to a pre-emphasis output terminal of the pre-emphasis module for outputting the designated gray-scale voltage;
the first switch is controlled to be turned on or turned off according to a value of the control signal;
an end of the second switch is connected to a pre-emphasis input voltage, and another end of the second switch is connected to the pre-emphasis output terminal of the designated gray-scale voltage;
the second switch is controlled to be turned on or turned off according to the value of the control signal;
the pre-emphasis output terminal of the designated gray-scale voltage is connected to an input terminal of the decoder corresponding to the designated gray-scale voltage.

### Claim 8 (depends on 6)

The pre-emphasis circuit according to claim 6, wherein each of the sub-control modules comprises a multiplexer,
input terminals of the multiplexer are respectively connected to the designated gray-scale voltage output terminal of the gamma voltage supplier and a pre-emphasis input voltage terminal, and an output terminal of the multiplexer is a pre-emphasis output terminal of the designated gray-scale voltage, the pre-emphasis output terminal of the designated gray-scale voltage is connected to the input terminal of the decoder corresponding to the designated gray-scale voltage;
the multiplexer determines whether to select the pre-emphasized voltage of a designated grayscale by using the value of the control signal.

### Claim 9 (depends on 1)

A pre-emphasis method applied to the pre-emphasis circuit according to claim 1, the method comprises:
receiving and storing first data and second data, the second data being next to the first data;
determining whether to pre-emphasize a gray-scale voltage corresponding to current input data according to a value of a designated bit of the first data and a value of a designated bit of the second data, an input pre-emphasis signal value input via an input pre-emphasis signal terminal, and a gray-scale value corresponding to the current input data;
outputting a pre-emphasis voltage which is a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is to be pre-emphasized; and
outputting the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is not to be pre-emphasized.

### Claim 10 (depends on 9)

The pre-emphasis method according to claim 9, wherein the determining whether to pre-emphasize the gray-scale voltage corresponding to the current input data according to the value of the designated bit of the first data and the value of the designated bit of the second data, the input pre-emphasis signal value input via the input pre-emphasis signal terminal, and the gray-scale value corresponding to the current input data comprises:
it is possible to pre-emphasize the gray-scale voltage corresponding to the current input data, when the value of the designated bit of the first data is not equal to the value of the designated bit of the second data, and the input pre-emphasis signal value is 1; and
it is unnecessary to pre-emphasize the gray-scale voltage corresponding to the current input data, when the value of the designated bit of the first data is equal to the value of the designated bit of the second data, or the input pre-emphasis signal value is 0.

### Claim 11 (depends on 10)

The pre-emphasis method according to claim 10, wherein that it is possible to pre-emphasize the gray-scale voltage corresponding to the current input data comprises:
outputting a pre-emphasis voltage which is a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data, if the gray-scale value corresponding to the current input data belongs to a pre-emphasis gray-scale range; and
outputting the gray-scale voltage corresponding to the current input data, if the grayscale value corresponding to the current input data does not belong to the pre-emphasis gray-scale range.

### Claim 12

A pre-emphasis device, comprising:
a first processing module configured to receive and store first data and second data, the second data being next to the first data; and
a second processing module configured to determine whether to pre-emphasize gray-scale voltage corresponding to current input data according to a value of a designated bit of the first data and a value of a designated bit of the second data, an input pre-emphasis signal value input via an input pre-emphasis signal terminal, and a gray-scale value corresponding to the current input data;
the second processing module is further configured to:
output a pre-emphasis voltage, which is a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is to be pre-emphasized; and
output the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is not to be pre-emphasized.

### Claim 13 (depends on 1)

A source driver chip comprising the pre-emphasis circuit according to claim 1.

### Claim 14 (depends on 13)

A display device comprising the source driver chip according to claim 13.

### Claim 15 (depends on 9)

An electronic device comprising a processor, a memory and computer program stored on the memory and executable on the processor, when the computer program is executed by the processor, the pre-emphasis method according to claim 9 is implemented.

### Claim 16 (depends on 2)

A pre-emphasis method applied to the pre-emphasis circuit according to claim 2, the method comprises:
receiving and storing first data and second data, the second data being next to the first data;
determining whether to pre-emphasize a gray-scale voltage corresponding to current input data according to a value of a designated bit of the first data and a value of a designated bit of the second data, an input pre-emphasis signal value input via an input pre-emphasis signal terminal, and a gray-scale value corresponding to the current input data;
outputting a pre-emphasis voltage which is a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is to be pre-emphasized; and
outputting the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is not to be pre-emphasized.

### Claim 17 (depends on 4)

A pre-emphasis method applied to the pre-emphasis circuit according to claim 4, the method comprises:
receiving and storing first data and second data, the second data being next to the first data;
determining whether to pre-emphasize a gray-scale voltage corresponding to current input data according to a value of a designated bit of the first data and a value of a designated bit of the second data, an input pre-emphasis signal value input via an input pre-emphasis signal terminal, and a gray-scale value corresponding to the current input data;
outputting a pre-emphasis voltage which is a voltage obtained by pre-emphasizing the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is to be pre-emphasized; and
outputting the gray-scale voltage corresponding to the current input data, if it is determined that the gray-scale voltage corresponding to the current input data is not to be pre-emphasized.

### Claim 18 (depends on 2)

A source driver chip comprising the pre-emphasis circuit according to claim 2.

### Claim 19 (depends on 4)

A source driver chip comprising the pre-emphasis circuit according to claim 4.

### Claim 20 (depends on 5)

A source driver chip comprising the pre-emphasis circuit according to claim 5.