# US 12,217,710 B2 · LED-display-screen drive chip and LED display screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,710 B2 - Document ID: US12217710B2 - Status: Granted - Kind: B2 - Application number: 18/497,006 - Filed: 2023-10-30 - Published: 2024-05-23 - Granted: 2025-02-04 - Earliest claimed: 2022-11-14 - Assignees: Chengdu Lippxin Microelectronics Co., Ltd - Applicants: Chengdu Lippxin Microelectronics Co., LTD - Inventors: Yongsheng Tang; Shilin Shen; Aqiang Liu; Shixiong Lu - Web page: https://patentgrep.com/patent/US12217710B2 ## CPC - G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix} - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - 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) ## Abstract Provided are LED-display-screen drive chip and LED display screen, wherein the drive chip is configured such that: when a grayscale value R of a grayscale data is less than or equal to Q, the grayscale data is allocated to one display group in M display groups; and when the grayscale value R of the grayscale data is larger than Q, the grayscale value of one display group of the M display groups is P, wherein P>=Q, and a total grayscale value of remaining M−1 display groups is R−P, wherein in display groups in the remaining M−1 display groups whose grayscale value is not 0, a number of display groups whose grayscale value is less than L is not more than 1, wherein L≥1, Q>L, and Q is a centralized display threshold. The present disclosure is capable of making the low-grayscale display effect smoother and improving the display effect. ## Claims ### Claim 1 An LED-display-screen drive chip, wherein the drive chip is configured such that: when a grayscale value R of a grayscale data is less than or equal to Q, the grayscale data is allocated to one display group in M display groups; and when a grayscale value R of a grayscale data is larger than Q, a grayscale value of one display group of the M display groups is configured as P, wherein P>=Q, and a total grayscale value of remaining M−1 display groups is R−P, wherein, among the remaining M−1 display groups, the number of display groups, whose grayscale values are each less than L but not 0, is not more than 1, wherein L≥1, Q>L, and Q is a centralized display threshold. ### Claim 2 (depends on 1) The LED-display-screen drive chip according to claim 1, wherein when R−P<(M−1)*L, the grayscale value, of which the magnitude is R−P, is allocated to A groups in the remaining M−1 display groups with each group having a grayscale value of L, and the remaining grayscale value which is less than L is allocated to the remaining M−1 display groups, wherein A is an integer part of (R−P)/L; and when R−P≥(M−1)*L, a grayscale value of each display group in the remaining M−1 display groups is at least L. ### Claim 3 (depends on 1) The LED-display-screen drive chip according to claim 1, wherein when Q0, a grayscale value of the k-th display group in A display groups in the M display groups is configured as L+yk, wherein yk≥0, k∈{1, . . . , A} and y ⁢ □ ⁢ ∑ k ⁢ □ ⁢ 1 A y k ⁢ □ ⁢ ∑ j ⁢ □ ⁢ 1 M - 1 - A z j ⁢ □ ⁢ B ; and when A=0, y ⁢ □ ⁢ ∑ j ⁢ □ ⁢ 1 M - 1 - A z j ⁢ □ ⁢ B , wherein A and B are an integer part and a remainder part of (R−Q)/L, respectively, and C and D are an integer part and a remainder part of (R−Q)/(M−1), respectively. ### Claim 4 (depends on 3) The LED-display-screen drive chip according to claim 3, wherein, when C0, ∑ k ⁢ □ ⁢ 1 A y k ⁢ □ ⁢ B . ### Claim 5 (depends on 3) The LED-display-screen drive chip according to claim 3, wherein when CM*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein h∈{1, . . . , M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 10 (depends on 9) The LED-display-screen drive chip according to claim 9, wherein fh∈{0, 1}, and h∈{1, . . . , M}. ### Claim 11 (depends on 1) An LED display screen, comprising a display panel and the LED-display-screen drive chip according to claim 1. ### Claim 12 (depends on 2) The LED-display-screen drive chip according to claim 2, wherein when Q0, a grayscale value of the k-th display group in A display groups in the M display groups is configured as L+yk, wherein yk≥0, k∈{1, . . . , A} and y ⁢  ∑ k ⁢  1 A y k ⁢  ∑ j ⁢  1 M - 1 - A z j ⁢  B ; and when A=0, y ⁢  ∑ j ⁢  1 M - 1 - A z j ⁢  B , wherein A and B are an integer part and a remainder part of (R−Q)/L, respectively, and C and D are an integer part and a remainder part of (R−Q)/(M−1), respectively. ### Claim 13 (depends on 4) The LED-display-screen drive chip according to claim 4, wherein when R>M*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein h∈{1, . . . , M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 14 (depends on 5) The LED-display-screen drive chip according to claim 5, wherein when R>M*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein h∈{1, . . . , M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 15 (depends on 6) The LED-display-screen drive chip according to claim 6, wherein when R>M*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein hϵ{1, . . . , M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 16 (depends on 7) The LED-display-screen drive chip according to claim 7, wherein when R>M*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein h∈{1, . . . M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 17 (depends on 8) The LED-display-screen drive chip according to claim 8, wherein when R>M*Q, the LED-display-screen drive chip is configured such that: a grayscale value of the h-th display group in the M display groups is E+fh, wherein h∈{1, . . . , M}, wherein ∑ h ⁢  1 M f h ⁢  F , and E and F are an integer part and a remainder part of R/M, respectively. ### Claim 18 (depends on 11) The LED display screen according to claim 11, wherein when Q0, a grayscale value of the k-th display group in A display groups in the M display groups is configured as L+yk, wherein yk≥0, k∈{1, . . . , A} and y ⁢  ∑ k ⁢  1 A y k ⁢  ∑ j ⁢  1 M - 1 - A z j ⁢  B ; and when A=0, y ⁢  ∑ j ⁢  1 M - 1 - A z j ⁢  B , wherein A and B are an integer part and a remainder part of (R−Q)/L, respectively, and C and D are an integer part and a remainder part of (R−Q)/(M−1), respectively. ### Claim 19 (depends on 18) The LED display screen according to claim 18, wherein, when C0, ∑ k ⁢  1 A y k ⁢  B . ### Claim 20 (depends on 18) The LED display screen according to claim 18, wherein when C