公开(公告)号：US10509430B2

公开(公告)日：2019-12-17

申请号：US15566121

申请日：2017-03-22

Applicant: BOE Technology Group Co., Ltd.

Inventor： Tangxiang Wang

IPC: G05F3/16 ,  G05F1/565 ,  G05F3/30

Abstract: The embodiments of the present disclosure disclose a reference circuit, comprising a current control sub-circuit, a voltage control sub-circuit and a voltage adjustment sub-circuit, wherein the current control sub-circuit outputs current to a first terminal and a second terminal of the voltage control sub-circuit and a first terminal of the voltage adjustment sub-circuit at a ratio of 1:1:n respectively, and the first terminal and the second terminal of the voltage control sub-circuit may cause a voltage at a second terminal of the voltage adjustment sub-circuit to be equal to a voltage at a third terminal of the voltage adjustment sub-circuit upon receiving equal current output by the current control sub-circuit, and the voltage adjustment sub-circuit may adjust a voltage output at an output terminal of the reference circuit to be independent of a temperature when the voltage at the second terminal is equal to the voltage at the third terminal.

公开(公告)号：US10291254B2

公开(公告)日：2019-05-14

申请号：US15735097

申请日：2017-07-07

Applicant: BOE Technology Group Co., Ltd.

Inventor： Tangxiang Wang ,  Chen Song

IPC: G09G5/00 ,  H03M1/76 ,  G09G3/3291

Abstract: Embodiments of the present disclosure relate to a digital-to-analog conversion circuit and method, a source driver, and a display apparatus. The digital-to-analog conversion circuit includes a first digital-to-analog converter corresponding to m high bits of (m+n)-bit digital signal and a second digital-to-analog converter corresponding to n low bits, where m and n are integers greater than 0. The first digital-to-analog converter comprises a voltage division module configured to generate 2m reference voltages at equal intervals in voltage; a first voltage selection module configured to select, from the 2m reference voltages, a first voltage corresponding to the m bits; and an operation module configured to generate a second voltage higher than the first voltage by the interval in voltage based on two adjacent reference voltages of the 2m reference voltages and the first voltage. The second digital-to-analog converter is configured to generate a third voltage corresponding to the n bits by using the first voltage and the second voltage as reference voltages, and to generate the sum of the third voltage and the first voltage.

公开(公告)号：US20190036542A1

公开(公告)日：2019-01-31

申请号：US15735097

申请日：2017-07-07

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Tangxiang Wang ,  Chen SONG

IPC: H03M1/76 ,  G09G3/3291

Abstract: Embodiments of the present disclosure relate to a digital-to-analog conversion circuit and method, a source driver, and a display apparatus. The digital-to-analog conversion circuit includes a first digital-to-analog converter corresponding to m high bits of (m+n)-bit digital signal and a second digital-to-analog converter corresponding to n low bits, where m and n are integers greater than 0. The first digital-to-analog converter comprises a voltage division module configured to generate 2m reference voltages at equal intervals in voltage; a first voltage selection module configured to select, from the 2m reference voltages, a first voltage corresponding to the m bits; and an operation module configured to generate a second voltage higher than the first voltage by the interval in voltage based on two adjacent reference voltages of the 2m reference voltages and the first voltage. The second digital-to-analog converter is configured to generate a third voltage corresponding to the n bits by using the first voltage and the second voltage as reference voltages, and to generate the sum of the third voltage and the first voltage.

公开(公告)号：US20180364751A1

公开(公告)日：2018-12-20

申请号：US15747379

申请日：2017-08-01

Applicant: BOE Technology Group Co., Ltd.

Inventor： Tangxiang Wang

IPC: G05F3/26 ,  H03F3/345

Abstract: A current mirror circuit includes: a first transistor and a second transistor connected in series, a third transistor and a fourth transistor connected in series; and further includes: a reference voltage source, a fifth transistor, and a control module connected between the reference voltage source and the fifth transistor. A current mirror is formed by the third transistor and the fourth transistor together with the first transistor and the second transistor, to produce a mirror current at a drain of the third transistor according to a current source coupled to a drain of the first transistor; the control module is configured to control the fifth transistor to operate in the linear region.

公开(公告)号：US20180173266A1

公开(公告)日：2018-06-21

申请号：US15566121

申请日：2017-03-22

Applicant: BOE Technology Group Co., Ltd.

Inventor： Tangxiang Wang

IPC: G05F3/16

Abstract: The embodiments of the present disclosure disclose a reference circuit, comprising a current control sub-circuit, a voltage control sub-circuit and a voltage adjustment sub-circuit, wherein the current control sub-circuit outputs current to a first terminal and a second terminal of the voltage control sub-circuit and a first terminal of the voltage adjustment sub-circuit at a ratio of 1:1:n respectively, and the first terminal and the second terminal of the voltage control sub-circuit may cause a voltage at a second terminal of the voltage adjustment sub-circuit to be equal to a voltage at a third terminal of the voltage adjustment sub-circuit upon receiving equal current output by the current control sub-circuit, and the voltage adjustment sub-circuit may adjust a voltage output at an output terminal of the reference circuit to be independent of a temperature when the voltage at the second terminal is equal to the voltage at the third terminal.