# US 11,908,373 B2 · Display driving circuit 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 11,908,373 B2 - Document ID: US11908373B2 - Status: Granted - Kind: B2 - Application number: 17/047,387 - Filed: 2020-05-26 - Published: 2023-04-27 - Granted: 2024-02-20 - Earliest claimed: 2020-03-31 - Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Zuzhao Xu; Seungkyu Choi - Web page: https://patentgrep.com/patent/US11908373B2 ## CPC - 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 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - G11C 19/28: using semiconductor elements (G11C19/14, G11C19/36 take precedence) - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2330/021: Power management, e.g. power saving - 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) - G11C: STATIC STORES (semiconductor memory devices H10B) ## Abstract The present application provides a display driving circuit and a display device, wherein the display driving circuit comprises a plurality of driving units, each of the driving units comprises a plurality of stages of sub driving units, each of the driving units is electrically connected to one of independent triggering units, and the sub driving units in the driving units are electrically connected stage by stage; and the display device comprises the display driving circuit. A structure of the driving circuit can realize partitioned work of the driving circuit, and can reduce power consumption of the display device when the display driving circuit is applied in the display device. ## Claims ### Claim 1 A display driving circuit, comprising: a plurality of driving units, each of the driving units comprises a plurality of stages of sub driving units; wherein each of the driving units is electrically connected to one of independent triggering units, the sub driving units in each of the driving units are electrically connected stage by stage, and each of the triggering units is configured to activate one of the driving units to provide signals to a display device; wherein each of the sub driving units comprises: a pull-up control unit electrically connected to a first clock signal input terminal, a first cascade signal input terminal, and a first node and configured to transmit signals input by the first cascade signal input terminal to the first node under control of signals input by the first clock signal input terminal; a pull-up unit electrically connected to the first node, a second clock signal input terminal, and a second node and configured to transmit signals input by the second clock signal input terminal to the second node under control of signals of the first node, wherein the second node is electrically connected to a cascade signal output terminal; a pull-down unit electrically connected to the second node, a third node, and a second low-voltage signal input terminal and configured to transmit signals input by the second low-voltage signal input terminal to the second node under control of signals of the third node; a pull-down control unit electrically connected to the first node, a second cascade signal input terminal, and a first low-voltage signal input terminal and configured to transmit signals input by the first low-voltage signal input terminal to the first node under control of signals input by the second cascade signal input terminal; and a pull-down maintaining unit electrically connected to the first node, the third node, a high-voltage signal input terminal, and the first low-voltage signal input terminal and configured to transmit signals input by the first low-voltage signal input terminal or signals input by the high-voltage signal input terminal to the third node under the control of the signals of the first node. ### Claim 2 (depends on 1) The display driving circuit of claim 1, wherein the display device comprises three display areas, the display driving circuit comprises three of the driving units, and each of the driving units is configured to independently drive one of the display areas of the display device, respectively. ### Claim 3 (depends on 2) The display driving circuit of claim 2, wherein the display device comprises a first display area, a second display area, and a third display area, the display driving circuit comprises a first driving unit, a second driving unit, and a third driving unit, the first driving unit is configured to drive the first display area, the second driving unit is configured to drive the second display area, and the third driving unit is configured to drive the third display area. ### Claim 4 (depends on 3) The display driving circuit of claim 3, wherein a first stage sub driving unit of the first driving unit is electrically connected to a first triggering unit, a first stage sub driving unit of the second driving unit is electrically connected to a second triggering unit, and a first stage sub driving unit of the third driving unit is electrically connected to a third triggering unit. ### Claim 5 (depends on 1) The display driving circuit of claim 1, wherein the pull-up unit comprises a capacitor and a first transistor, a first terminal of the capacitor is electrically connected to the second clock signal input terminal, and a second terminal of the capacitor is electrically connected to the first node; and a gate of the first transistor is electrically connected to the first node, a source of the first transistor is electrically connected to the second clock signal input terminal, and a drain of the first transistor is electrically connected to the second node. ### Claim 6 (depends on 1) The display driving circuit of claim 1, wherein the pull-up control unit comprises a second transistor, a gate of the second transistor is electrically connected to the first clock signal input terminal, a source of the second transistor is electrically connected to the cascade signal input terminal, and a drain of the second transistor is electrically connected to the first node. ### Claim 7 (depends on 1) The display driving circuit of claim 1, wherein the pull-down unit comprises a third transistor, a gate of the third transistor is electrically connected to the third node, a source of the third transistor is electrically connected to the second low-voltage signal input terminal, and a drain of the third transistor is electrically connected to the second node. ### Claim 8 (depends on 1) The display driving circuit of claim 1, wherein the pull-down control unit comprises a fourth transistor, a gate of the fourth transistor is electrically connected to the second cascade signal input terminal, a source of the fourth transistor is electrically connected to the first low-voltage signal input terminal, and a drain of the fourth transistor is electrically connected to the first node. ### Claim 9 (depends on 1) The display driving circuit of claim 1, wherein the pull-down maintaining unit comprises a fifth transistor, a sixth transistor, and a seventh transistor, a source of the fifth transistor and a source of the sixth transistor are electrically connected to the first low-voltage signal input terminal, a drain of the fifth transistor and a gate of the sixth transistor are electrically connected to the first node, a gate of the fifth transistor and a drain of the sixth transistor are electrically connected to the third node, a gate and a source of the seventh transistor are electrically connected to the high-voltage signal input terminal, and a drain of the seventh transistor is electrically connected to the third node. ### Claim 10 (depends on 1) The display driving circuit of claim 1, wherein a first cascade signal input terminal of a first stage sub driving unit is electrically connected to the triggering unit. ### Claim 11 (depends on 10) The display driving circuit of claim 10, wherein a first cascade signal input terminal of an nth stage sub driving unit is electrically connected to a cascade signal output terminal of an (n−1)th stage sub driving unit; a second cascade signal input terminal of the nth stage sub driving unit is electrically connected to a cascade signal output terminal of an (n+1)th stage sub driving unit; and wherein n is an integer greater than or equal to 2. ### Claim 12 (depends on 11) The display driving circuit of claim 11, wherein the first clock signal input terminal is electrically connected to a first clock signal line, and the second clock signal input terminal is electrically connected to a second clock signal line. ### Claim 13 (depends on 12) The display driving circuit of claim 12, wherein the first low-voltage signal input terminal is electrically connected to a first low-voltage signal line, the second low-voltage signal input terminal is electrically connected to a second low-voltage signal line, and the high-voltage signal input terminal is electrically connected to a high-voltage signal line. ### Claim 14 (depends on 1) The display driving circuit of claim 1, wherein only one of the driving units works alone when driving the display device. ### Claim 15 (depends on 1) The display driving circuit of claim 1, wherein any two or more of the driving units work simultaneously when driving the display device. ### Claim 16 (depends on 1) The display driving circuit of claim 1, wherein the display driving circuit is applied in a foldable display device, and each of the driving units corresponds to a foldable display area of the foldable display device. ### Claim 17 (depends on 1) A display device, comprising a display panel, wherein the display panel comprises a plurality of display areas, the display panel is driven to display by the display driving circuit of claim 1, and each of the display areas corresponds to one of the driving units. ### Claim 18 (depends on 17) The display device of claim 17, wherein only one of the driving units is driving one of the display areas to display alone, or any two or more of the driving units drive two or more of the display areas to display simultaneously when driving the display device. ### Claim 19 A display device, comprising a display panel and a display driving circuit configured to drive the display panel to display, wherein the display panel comprises a first display area, a second display area, and a third display area, the display driving circuit comprises a first driving unit, a second driving unit, and a third driving unit, and each of the driving units is controlled independently by one of triggering units, respectively; the first driving unit is electrically connected to the first display area and configured to drive the first display area to display; the second driving unit is electrically connected to the second display area and configured to drive the second display area to display; and the third driving unit is electrically connected to the third display area and configured to drive the third display area to display; wherein each of the sub driving units comprises: a pull-up control unit electrically connected to a first clock signal input terminal, a first cascade signal input terminal, and a first node and configured to transmit signals input by the first cascade signal input terminal to the first node under control of signals input by the first clock signal input terminal; a pull-up unit electrically connected to the first node, a second clock signal input terminal, and a second node and configured to transmit signals input by the second clock signal input terminal to the second node under control of signals of the first node, wherein the second node is electrically connected to a cascade signal output terminal; a pull-down unit electrically connected to the second node, a third node, and a second low-voltage signal input terminal and configured to transmit signals input by the second low-voltage signal input terminal to the second node under control of signals of the third node; a pull-down control unit electrically connected to the first node, a second cascade signal input terminal, and a first low-voltage signal input terminal and configured to transmit signals input by the first low-voltage signal input terminal to the first node under control of signals input by the second cascade signal input terminal; and a pull-down maintaining unit electrically connected to the first node, the third node, a high-voltage signal input terminal, and the first low-voltage input terminal and configured to transmit signals input by the first low-voltage signal input terminal or signals input by the high-voltage signal input terminal to the third node under the control of the signals of the first node.