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A liquid crystal display (LCD) and a method for compensating current leakage of the LCD are provided. The LCD includes a thin film transistor (TFT) array having a plurality of TFTs, a gate driver configured to provide a scan signal, a source driver configured to provide a data signal, and a timing controller electrically connected to the gate driver and the source driver. The timing controller is configured to adjust a current refresh frequency according to a current frame rate and to transfer a control signal to the gate driver when the current refresh frequency is lower than a threshold frequency such that the gate driver increase a charging time of the plurality of TFTs according to the control signal.

Titel:	Liquid crystal device and method for compensating current leakage of LCD
Autor/in / Beteiligte Person:	Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2024
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 11961,449 Publication Date: April 16, 2024 Appl. No: 17/042966 Application Filed: August 07, 2020 Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (Shenzhen, CN) Claim: 1. A liquid crystal display (LCD), comprising: a thin film transistor (TFT) array, comprising a plurality of TFTs; a gate driver, configured to provide a scan signal; a source driver, configured to provide a data signal; and a timing controller, electrically connected to the gate driver and the source driver, configured to calculate a vertical blank interval, to adjust a current refresh frequency according to a current frame rate, and to transfer a control signal to the gate driver when the current refresh frequency is lower than a threshold frequency and the vertical blank interval is longer than a threshold time period such that the gate driver increase a charging time of the plurality of TFTs according to the control signal. Claim: 2. The LCD of claim 1 , wherein the current refresh frequency is identical to the current frame rate. Claim: 3. The LCD of claim 1 , wherein the timing controller calculates a leakage voltage of the plurality of TFTs at the current refresh frequency and determines the charging time according to the leakage voltage. Claim: 4. The LCD of claim 1 , the timing controller calculates a gray voltage maintaining time of the plurality of TFTs at the current refresh frequency and determines the charging time according to the gray voltage maintaining time. Claim: 5. The LCD of claim 1 , wherein the gate driver is configured to put a clock of the scan signal in advance to increase the charging time of the TFTs is increased. Claim: 6. A method for compensating current leakage of a liquid crystal display (LCD) that comprises a thin film transistor (TFT) array having a plurality of TFTs, a gate driver configured to provide a scan signal, a source driver configured to provide a data signal, and a timing controller, the method executable by the timing controller comprising: adjusting a current refresh frequency according to a current frame rate; calculating a vertical blank interval; and transferring a control signal to the gate driver when the current refresh frequency is lower than a threshold frequency and the vertical blank interval is longer than a threshold time period such that the gate driver increases a charging time of the plurality of TFTs according to the control signal. Claim: 7. The method of claim 6 , wherein the current refresh frequency is identical to the current frame rate. Claim: 8. The method of claim 6 , wherein the timing controller calculates a leakage voltage of the plurality of TFTs at the current refresh frequency and determines the charging time according to the leakage voltage. Claim: 9. The method of claim 6 , the timing controller calculates a gray voltage maintaining time of the plurality of TFTs at the current refresh frequency and determines the charging time according to the gray voltage maintaining time. Claim: 10. The method of claim 6 , further comprising controlling the gate driver through the control signal to put a clock of the scan signal in advance to increase the charging time of the TFTs is increased. Patent References Cited: 20140368418 December 2014 Liu et al. ; 20150070345 March 2015 Liu ; 20150070618 March 2015 Liu ; 20160035297 February 2016 Oh ; 20170148422 May 2017 Huang ; 20190005862 January 2019 Zhang ; 20210027708 January 2021 Yamato et al. ; 20210049967 February 2021 Zhang et al. ; 101833920 September 2010 ; 102800288 November 2012 ; 107610671 January 2018 ; 110310600 October 2019 ; 110570828 December 2019 ; 110751933 February 2020 ; 10-2015-0035109 April 2015 ; 10-2015-0077742 July 2015 ; WO 2019/187063 October 2019 Primary Examiner: Nguyen, Jennifer T

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Liquid crystal device and method for compensating current leakage of LCD