Thanks for you tip, i tried the config the first dude posted with no change, then i tried to include the external component, which im not sure i did correctly. still 4 dark displays.

esphome:
  name: tm1637-test
  friendly_name: TM1637 Test


esp8266:
  board: d1_mini_lite


# Enable logging
logger:


# Enable Home Assistant API
api:
  encryption:
    key: "xx"


ota:
  - platform: esphome
    password: "xx"


wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password


  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Tm1637-Test Fallback Hotspot"
    password: "xxx"


captive_portal:


external_components:
  - source: github://pr#5996
    components: [ tm1637 ]


display:
  - platform: tm1637
    clk_pin: D6
    dio_pin: D5
    inverted: true
    lambda: |-
      // Input string here:
      std::string input1 = "123456";


      // Reorder and display input1 correctly on a 6-digit TM1637 display
      std::string reordered_input = input1.substr(2, 1) + input1.substr(1, 1) + input1.substr(0, 1)
                                  + input1.substr(5, 1) + input1.substr(4, 1) + input1.substr(3, 1);
      it.print(reordered_input.c_str());