# US 11,114,053 B2 · Anti-peeping circuit, driving method thereof, and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,053 B2 - Document ID: US11114053B2 - Status: Granted - Kind: B2 - Application number: 16/632,936 - Filed: 2019-01-04 - Published: 2021-03-11 - Granted: 2021-09-07 - Earliest claimed: 2019-01-04 - Assignees: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Xinle Wang; Wei Sun; Wenchao Han; Zhaohui Meng; Lianghao Zhang; Yilin Feng; Xiaoyang Shen - Web page: https://patentgrep.com/patent/US11114053B2 ## CPC - G09G 3/3677: {suitable for active matrices only} - G02F 1/13306: {Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence)} - G02F 1/134309: {characterised by their geometrical arrangement} - G09G 3/3611: {Control of matrices with row and column drivers} - G09G 2310/06: Details of flat display driving waveforms - G09G 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/028: by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction - G09G 2320/068: for control of viewing angle adjustment - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2358/00: Arrangements for display data security - 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) - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract An anti-peeping circuit for a display panel, a driving method thereof, and a display device. The anti-peeping circuit includes a waveform generator. The waveform generator is connected to an anti-peeping electrode of the display panel, and the waveform generator is configured to generate an anti-peeping signal and output the anti-peeping signal to the anti-peeping electrode of the display panel. ## Claims ### Claim 1 An anti-peeping circuit for a display panel, the anti-peeping circuit comprising a waveform generator, wherein the waveform generator is connected to an anti-peeping electrode of the display panel, and the waveform generator is configured to generate an anti-peeping signal and output the anti-peeping signal to the anti-peeping electrode of the display panel; and a calculating circuit, wherein the calculating circuit is connected to the waveform generator and the anti-peeping electrode, respectively, and the calculating circuit is configured to amplify the anti-peeping signal and output the amplified anti-peeping signal to the anti-peeping electrode, wherein the calculating circuit comprises a first calculating sub-circuit and a second calculating sub-circuit; the first calculating sub-circuit comprises a first input terminal, a second input terminal and a first output terminal, the second calculating sub-circuit comprises a third input terminal, a fourth input terminal and a second output terminal, the first input terminal of the first calculating sub-circuit is connected to an output terminal of the waveform generator to receive the anti-peeping signal, the second input terminal of the first calculating sub-circuit is connected to a reference voltage terminal to receive a reference voltage, and the first output terminal of the first calculating sub-circuit is connected to the third input terminal of the second calculating sub-circuit; and the fourth input terminal of the second calculating sub-circuit is connected to a bias voltage terminal to receive a bias voltage, and the second output terminal of the second calculating sub-circuit is connected to the anti-peeping electrode to output the amplified anti-peeping signal. ### Claim 2 (depends on 1) The anti-peeping circuit according to claim 1, wherein the first calculating sub-circuit is a first subtraction sub-circuit, and the second calculating sub-circuit is a second subtraction sub-circuit. ### Claim 3 (depends on 1) The anti-peeping circuit according to claim 1, wherein the waveform generator comprises a digital-to-analog converter; and the digital-to-analog converter is configured to perform digital-to-analog conversion on the anti-peeping signal and output the converted anti-peeping signal from an output terminal of the waveform generator. ### Claim 4 (depends on 1) The anti-peeping circuit according to claim 1, wherein the waveform generator further comprises an interruption unit configured to control outputting of the anti-peeping signal in a case where a trigger signal is detected, and the trigger signal is provided by a timing controller. ### Claim 5 (depends on 1) The anti-peeping circuit according to claim 1, wherein the waveform generator further comprises an input terminal, and is configured to receive an instruction for generating the anti-peeping signal. ### Claim 6 (depends on 1) The anti-peeping circuit according to claim 1, wherein each period of the anti-peeping signal comprises a gradually-changing-level region and a constant-level region. ### Claim 7 (depends on 1) The anti-peeping circuit according to claim 1, wherein the bias voltage is configured so that a first difference value of the anti-peeping signal is equal to a second difference value of the anti-peeping signal; and the first difference value is a difference value between a first level of the anti-peeping signal and a common voltage, and the second difference value is a difference value between a second level of the anti-peeping signal and the common voltage. ### Claim 8 (depends on 7) The anti-peeping circuit according to claim 7, wherein the first calculating sub-circuit is a first subtraction sub-circuit, and the second calculating sub-circuit is a second subtraction sub-circuit. ### Claim 9 (depends on 7) The anti-peeping circuit according to claim 7, wherein the waveform generator comprises a digital-to-analog converter; and the digital-to-analog converter is configured to perform digital-to-analog conversion on the anti-peeping signal and output the converted anti-peeping signal from the output terminal of the waveform generator. ### Claim 10 (depends on 1) A display device, comprising the anti-peeping circuit according to claim 1 and a display panel, wherein the display panel comprises an anti-peeping electrode, and the anti-peeping electrode is electrically connected to the anti-peeping circuit. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the display panel is a liquid crystal display panel, and the anti-peeping electrode is at a displaying side of the liquid crystal display panel and covers at least a display area. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the liquid crystal display panel comprises: a first substrate, a second substrate opposite to the first substrate, and a liquid crystal layer between the first substrate and the second substrate; and the anti-peeping electrode is on the second substrate, and is configured to apply an electrical signal to the liquid crystal layer under a control of the anti-peeping signal output by the anti-peeping circuit. ### Claim 13 (depends on 10) The display device according to claim 10, further comprising a timing controller, wherein the timing controller is configured to be connected to the anti-peeping circuit and a gate driving circuit of the display panel to provide a trigger signal. ### Claim 14 A driving method of an anti-peeping circuit for a display panel, the anti-peeping circuit comprising a waveform generator, wherein the waveform generator is connected to an anti-peeping electrode of the display panel, and the waveform generator is configured to generate an anti-peeping signal and output the anti-peeping signal to the anti-peeping electrode of the display panel, and the driving method comprises: generating the anti-peeping signal by the waveform generator, and inputting the anti-peeping signal to the anti-peeping electrode of the display panel, and the anti-peeping circuit further comprises a calculating circuit, and the driving method further comprises: amplifying, by the calculating circuit, the anti-peeping signal generated by the waveform generator; and sending the amplified anti-peeping signal to the anti-peeping electrode of the display panel, wherein the calculating circuit comprises a first calculating sub-circuit and a second calculating sub-circuit, the first calculating sub-circuit comprises a first input terminal, a second input terminal and a first output terminal, the second calculating sub-circuit comprises a third input terminal, a fourth input terminal and a second output terminal, the first input terminal of the first calculating sub-circuit is connected to an output terminal of the waveform generator to receive the anti-peeping signal, the second input terminal of the first calculating sub-circuit is connected to a reference voltage terminal to receive a reference voltage, and the first output terminal of the first calculating sub-circuit is connected to the third input terminal of the second calculating sub-circuit; and the fourth input terminal of the second calculating sub-circuit is connected to a bias voltage terminal to receive a bias voltage, and the second output terminal of the second calculating sub-circuit is connected to the anti-peeping electrode to output the amplified anti-peeping signal. ### Claim 15 (depends on 14) The driving method according to claim 14, wherein the waveform generator comprises an interruption unit, and the driving method further comprises: outputting by the waveform generator the anti-peeping signal to the anti-peeping electrode, in a case where the interruption unit detects a trigger signal.