# US 2018/0322839 A1 · Display panel and display apparatus using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0322839 A1 - Document ID: US20180322839A1 - Status: Published application - Kind: A1 - Application number: 15/555,871 - Filed: 2017-05-17 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: Hkc Corporation Limited; Chongqing Hkc Optoelectronics Technology Co., Ltd. - Applicants: Hkc Corporation Limited; Chongqing Hkc Optoelectronics Technology Co., Ltd. - Inventors: Yu-Jen CHEN - Web page: https://patentgrep.com/patent/US20180322839A1 ## CPC - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G02F 1/1345: Conductors connecting electrodes to cell terminals - G02F 1/136286: {Wiring, e.g. gate line, drain line} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - 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 This application relates to a display panel and a display apparatus using same. The display panel includes: a control board (C-Board); a common voltage regulating unit, connected to the C-Board, where the common voltage regulating unit includes a common voltage generation circuit, a voltage comparator, and a voltage regulator; and an active element array substrate, connected to the common voltage regulating unit and connected to the C-Board by using a signal drive circuit. According to this application, a common voltage may be automatically detected, compared, and regulated by disposing the common voltage regulating unit. ## Claims ### Claim 1 A display panel, comprising: a control board (C-Board); a common voltage regulating unit, electrically connected to the C-Board, wherein the common voltage regulating unit comprises a common voltage generation circuit, a voltage comparator, and a voltage regulator electrically connected to each other; and an active element array substrate, electrically connected to the common voltage regulating unit, and connected to the C-Board by using a signal drive circuit, wherein the C-Board outputs a reference voltage to the common voltage generation circuit, the common voltage generation circuit transmits the reference voltage to the voltage comparator for record or comparison, the common voltage generation circuit is fed back and regulated by using the voltage regulator according to a comparison result of the voltage comparator, and a common voltage is inputted to the active element array substrate, so that the common voltage of the active element array substrate is maintained stable. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the signal drive circuit comprises a scanning signal drive circuit and a data signal drive circuit. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein the scanning signal drive circuit and the data signal drive circuit each are connected to the C-Board by using a flexible flat cable (FFC). ### Claim 4 (depends on 2) The display panel according to claim 2, wherein the active element array substrate comprises a substrate, the substrate comprises a display area and a plurality of scanning wires, disposed on the substrate and connected to the scanning signal drive circuit and a plurality of data wires, disposed on the substrate and connected to the data signal drive circuit and a plurality of active elements, disposed on the substrate, and arranged in an array in the display area, and each of the active elements is electrically connected to the corresponding scanning wire and the corresponding data wire. ### Claim 5 (depends on 4) The display panel according to claim 4, wherein the scanning signal drive circuit is electrically connected to the active elements in the display area by using a gate-chip on film (G-COF), and the data signal drive circuit is electrically connected to the active elements in the display area by using a source-chip on film (S-COF). ### Claim 6 (depends on 1) The display panel according to claim 1, wherein after the common voltage generation circuit transmits the reference voltage to the voltage comparator, the voltage comparator obtains a logic voltage by comparing the reference voltage with a voltage of the active element array substrate, the logic voltage is a high voltage when the reference voltage is greater than the voltage of the active element array substrate, and the logic voltage is a low voltage when the reference voltage is less than the voltage of the active element array substrate. ### Claim 7 (depends on 6) The display panel according to claim 6, wherein when the logic voltage is a high voltage, the voltage comparator outputs a signal to enable the voltage regulator to reduce the common voltage of the common voltage generation circuit, and inputs the reduced common voltage to the active element array substrate. ### Claim 8 (depends on 6) The display panel according to claim 6, wherein when the logic voltage is a low voltage, the voltage comparator outputs a signal to enable the voltage regulator to increase the common voltage of the common voltage generation circuit, and inputs the increased common voltage to the active element array substrate. ### Claim 9 (depends on 1) The display panel according to claim 1, wherein when the reference voltage is equal to a voltage of the active element array substrate, the voltage comparator does not output a signal to enable the voltage regulator to regulate the common voltage generation circuit. ### Claim 10 A display apparatus, comprising: a backlight module; and a display panel, comprising: a control board (C-Board); a common voltage regulating unit, electrically connected to the C-Board, wherein the common voltage regulating unit comprises a common voltage generation circuit, a voltage comparator, and a voltage regulator electrically connected to each other; and an active element array substrate, electrically connected to the common voltage regulating unit, and connected to the C-Board by using a signal drive circuit, wherein the C-Board outputs a reference voltage to the common voltage generation circuit, the common voltage generation circuit transmits the reference voltage to the voltage comparator for record or comparison, the common voltage generation circuit is fed back and regulated by using the voltage regulator according to a comparison result of the voltage comparator, and a common voltage is inputted to the active element array substrate, so that the common voltage of the active element array substrate is maintained stable. ### Claim 11 (depends on 10) The display apparatus according to claim 10, wherein the signal drive circuit comprises a scanning signal drive circuit and a data signal drive circuit. ### Claim 12 (depends on 11) The display apparatus according to claim 11, wherein the scanning signal drive circuit and the data signal drive circuit each are connected to the C-Board by using a flexible flat cable (FFC). ### Claim 13 (depends on 11) The display apparatus according to claim 11, wherein the active element array substrate comprises a substrate, the substrate comprises a display area and a plurality of scanning wires, disposed on the substrate and connected to the scanning signal drive circuit and a plurality of data wires, disposed on the substrate and connected to the data signal drive circuit and a plurality of active elements, disposed on the substrate, and arranged in an array in the display area, and each of the active elements is electrically connected to the corresponding scanning wire and the corresponding data wire. ### Claim 14 (depends on 13) The display apparatus according to claim 13, wherein the scanning signal drive circuit is electrically connected to the active elements in the display area by using a gate-chip on film (G-COF), and the data signal drive circuit is electrically connected to the active elements in the display area by using a source-chip on film (S-COF). ### Claim 15 (depends on 10) The display apparatus according to claim 10, wherein after the common voltage generation circuit transmits the reference voltage to the voltage comparator, the voltage comparator obtains a logic voltage by comparing the reference voltage with a voltage of the active element array substrate, the logic voltage is a high voltage when the reference voltage is greater than the voltage of the active element array substrate, and the logic voltage is a low voltage when the reference voltage is less than the voltage of the active element array substrate. ### Claim 16 (depends on 15) The display apparatus according to claim 15, wherein when the logic voltage is a high voltage, the voltage comparator outputs a signal to enable the voltage regulator to reduce the common voltage of the common voltage generation circuit, and inputs the reduced common voltage to the active element array substrate. ### Claim 17 (depends on 15) The display apparatus according to claim 15, wherein when the logic voltage is a low voltage, the voltage comparator outputs a signal to enable the voltage regulator to increase the common voltage of the common voltage generation circuit, and inputs the increased common voltage to the active element array substrate. ### Claim 18 (depends on 10) The display apparatus according to claim 10, wherein when the reference voltage is equal to a voltage of the active element array substrate, the voltage comparator does not output a signal to enable the voltage regulator to regulate the common voltage generation circuit.