diff --git a/docs/api-ideas.md b/docs/api-ideas.md
new file mode 100644
index 000000000..3c4a97c34
--- /dev/null
+++ b/docs/api-ideas.md
@@ -0,0 +1,145 @@
+##trezor.crypto
+
+###trezor.crypto.aes
+
+``` python
+AES_CTX = object # AES context
+
+def aes_encrypt_key128(key: bytes16, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_encrypt_key192(key: bytes24, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_encrypt_key256(key: bytes32, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_decrypt_key128(key: bytes16, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_decrypt_key192(key: bytes24, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_decrypt_key256(key: bytes32, iv: bytes16 = None) -> AES_CTX: # context
+
+def aes_ecb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
+
+def aes_cbc_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
+
+def aes_cfb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
+
+def aes_ofb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
+
+def aes_ctr_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
+
+def aes_ecb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+
+def aes_cbc_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+
+def aes_cfb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+
+def aes_ofb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+
+def aes_ctr_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+```
+
+###trezor.crypto.base58
+
+``` python
+def encode(data: bytes) -> bytes: # encoded
+
+def decode(data: bytes) -> bytes: # decoded
+
+def encode_check(data: bytes) -> bytes: # encoded
+
+def decode_check(data: bytes) -> bytes: # decoded
+```
+
+###trezor.crypto.ed25519
+
+``` python
+def to_public(secret_key: bytes32) -> bytes32: # public_key
+
+def sign(message: bytes, secret_key: bytes32, public_key: bytes32 = None) -> bytes64: # signature
+
+def verify(message: bytes, public_key: bytes32, signature: bytes64) -> bool: # valid
+```
+
+###trezor.crypto.hash
+
+``` python
+def sha256(data: bytes) -> bytes32: # hashed
+
+def sha512(data: bytes) -> bytes64: # hashed
+
+def ripemd160(data: bytes) -> bytes20: # hashed
+```
+
+###trezor.crypto.hd
+
+TODO
+
+###trezor.crypto.hmac
+
+``` python
+def hmac_sha256(key: bytes, message: bytes) -> bytes32: # hmac
+
+def hmac_sha512(key: bytes, message: bytes) -> bytes64: # hmac
+```
+
+###trezor.crypto.kdf
+
+``` python
+def pbkdf2_hmac_sha256(password: bytes, salt: bytes, iterations: int, keylen: int) -> bytes32: # key
+
+def pbkdf2_hmac_sha512(password: bytes, salt: bytes, iterations: int, keylen: int) -> bytes32: # key
+```
+
+###trezor.crypto.mnemonic
+
+``` python
+def bip39_generate(strength: int) -> bytes: # sentence
+
+def bip39_fromdata(data: bytes) -> bytes: # sentence
+
+def bip39_check(mnemonic: bytes) -> bool: # valid
+
+def bip39_seed(mnemonic: bytes, passphrase: bytes) -> bytes64: # seed
+```
+
+###trezor.crypto.nistp256
+
+``` python
+def to_public(secret_key: bytes32) -> bytes33: # public_key
+
+def sign(message: bytes, secret_key: bytes32, public_key: bytes33 = None) -> bytes65: # signature
+
+def verify(message: bytes, public_key: bytes33, signature: bytes65) -> bool: # valid
+```
+
+###trezor.crypto.reedsolomon
+
+``` python
+def encode(data: bytes) -> bytes: # encoded
+
+def decode(data: bytes) -> bytes: # decoded
+```
+
+###trezor.crypto.secp256k1
+
+``` python
+def to_public(secret_key: bytes32) -> bytes33: # public_key
+
+def sign(message: bytes, secret_key: bytes32, public_key: bytes33 = None) -> bytes65: # signature
+
+def verify(message: bytes, public_key: bytes33, signature: bytes65) -> bool: # valid
+```
+
+##trezor.utils
+
+###trezor.utils.qrenc
+
+``` python
+class QrLevel(Enum):
+    L = 0
+    M = 1
+    Q = 2
+    H = 3
+
+def encode(source: bytes, level: QrLevel = QrLevel.H) -> list: # data
+```
diff --git a/docs/api.md b/docs/api.md
index fd65546cc..8cfd250d1 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -15,158 +15,34 @@ bytes65 = bytes # bytes variable of exactly 65 bytes
 
 Syntax used below is a valid Python function declaration with type hints defined in [PEP 0484](https://www.python.org/dev/peps/pep-0484/).
 
-##trezor.crypto
+##trezor.ui
 
-###trezor.crypto.aes
+###trezor.ui.display
 
 ``` python
-AES_CTX = object # AES context
+trezor.ui.display.bar(self, x: int, y: int, w: int, h: int, color: int) -> None
 
-def aes_encrypt_key128(key: bytes16, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.blit(self, x: int, y: int, w: int, h: int, data: bytes) -> None
 
-def aes_encrypt_key192(key: bytes24, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.image(self, x: int, y: int, image: bytes) -> None
 
-def aes_encrypt_key256(key: bytes32, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.icon(self, x: int, y: int, icon: bytes, fgcolor: int, bgcolor: int) -> None
 
-def aes_decrypt_key128(key: bytes16, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.text(self, x: int, y: int, text: bytes, font: int, fgcolor: int, bgcolor: int) -> None
 
-def aes_decrypt_key192(key: bytes24, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.orientation(self, degrees: int) -> None
 
-def aes_decrypt_key256(key: bytes32, iv: bytes16 = None) -> AES_CTX: # context
+trezor.ui.display.rawcmd(self, reg: int, data: bytes) -> None
 
-def aes_ecb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
-
-def aes_cbc_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
-
-def aes_cfb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
-
-def aes_ofb_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
-
-def aes_ctr_encrypt(ctx: AES_CTX, data: bytes) -> bytes: # encrypted
-
-def aes_ecb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
-
-def aes_cbc_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
-
-def aes_cfb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
-
-def aes_ofb_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
-
-def aes_ctr_decrypt(ctx: AES_CTX, data: bytes) -> bytes: # decrypted
+trezor.ui.display.backlight(self, val: int) -> None
 ```
 
-###trezor.crypto.base58
+###trezor.ui.touch
 
 ``` python
-def encode(data: bytes) -> bytes: # encoded
+trezor.ui.touch.callback_start(self, callback) -> None
 
-def decode(data: bytes) -> bytes: # decoded
+trezor.ui.touch.callback_move(self, callback) -> None
 
-def encode_check(data: bytes) -> bytes: # encoded
-
-def decode_check(data: bytes) -> bytes: # decoded
-```
-
-###trezor.crypto.ed25519
-
-``` python
-def to_public(secret_key: bytes32) -> bytes32: # public_key
-
-def sign(message: bytes, secret_key: bytes32, public_key: bytes32 = None) -> bytes64: # signature
-
-def verify(message: bytes, public_key: bytes32, signature: bytes64) -> bool: # valid
-```
-
-###trezor.crypto.hash
-
-``` python
-def sha256(data: bytes) -> bytes32: # hashed
-
-def sha512(data: bytes) -> bytes64: # hashed
-
-def ripemd160(data: bytes) -> bytes20: # hashed
-```
-
-###trezor.crypto.hd
-
-TODO
-
-###trezor.crypto.hmac
-
-``` python
-def hmac_sha256(key: bytes, message: bytes) -> bytes32: # hmac
-
-def hmac_sha512(key: bytes, message: bytes) -> bytes64: # hmac
-```
-
-###trezor.crypto.kdf
-
-``` python
-def pbkdf2_hmac_sha256(password: bytes, salt: bytes, iterations: int, keylen: int) -> bytes32: # key
-
-def pbkdf2_hmac_sha512(password: bytes, salt: bytes, iterations: int, keylen: int) -> bytes32: # key
-```
-
-###trezor.crypto.mnemonic
-
-``` python
-def bip39_generate(strength: int) -> bytes: # sentence
-
-def bip39_fromdata(data: bytes) -> bytes: # sentence
-
-def bip39_check(mnemonic: bytes) -> bool: # valid
-
-def bip39_seed(mnemonic: bytes, passphrase: bytes) -> bytes64: # seed
-```
-
-###trezor.crypto.nistp256
-
-``` python
-def to_public(secret_key: bytes32) -> bytes33: # public_key
-
-def sign(message: bytes, secret_key: bytes32, public_key: bytes33 = None) -> bytes65: # signature
-
-def verify(message: bytes, public_key: bytes33, signature: bytes65) -> bool: # valid
-```
-
-###trezor.crypto.reedsolomon
-
-``` python
-def encode(data: bytes) -> bytes: # encoded
-
-def decode(data: bytes) -> bytes: # decoded
-```
-
-###trezor.crypto.secp256k1
-
-``` python
-def to_public(secret_key: bytes32) -> bytes33: # public_key
-
-def sign(message: bytes, secret_key: bytes32, public_key: bytes33 = None) -> bytes65: # signature
-
-def verify(message: bytes, public_key: bytes33, signature: bytes65) -> bool: # valid
-```
-
-##trezor.hw
-
-###trezor.hw.button
-
-TODO
-
-###trezor.hw.display
-
-TODO
-
-##trezor.utils
-
-###trezor.utils.qrenc
-
-``` python
-class QrLevel(Enum):
-    L = 0
-    M = 1
-    Q = 2
-    H = 3
-
-def encode(source: bytes, level: QrLevel = QrLevel.H) -> list: # data
+trezor.ui.touch.callback_end(self, callback) -> None
 ```
diff --git a/extmod/modTrezorUi/modTrezorUi-stmhal.h b/extmod/modTrezorUi/modTrezorUi-stmhal.h
index 8763d8462..d991c5eaa 100644
--- a/extmod/modTrezorUi/modTrezorUi-stmhal.h
+++ b/extmod/modTrezorUi/modTrezorUi-stmhal.h
@@ -170,3 +170,7 @@ static void display_rawcmd(uint8_t reg, uint8_t *data, int datalen)
     CMD(reg);
     DATAS(data, datalen);
 }
+
+static void display_backlight(uint8_t val)
+{
+}
diff --git a/extmod/modTrezorUi/modTrezorUi-unix.h b/extmod/modTrezorUi/modTrezorUi-unix.h
index 748a87ef3..f0f6ee1c3 100644
--- a/extmod/modTrezorUi/modTrezorUi-unix.h
+++ b/extmod/modTrezorUi/modTrezorUi-unix.h
@@ -111,3 +111,7 @@ static void display_orientation(int degrees)
 static void display_rawcmd(uint8_t reg, uint8_t *data, int datalen)
 {
 }
+
+static void display_backlight(uint8_t val)
+{
+}
diff --git a/extmod/modTrezorUi/modTrezorUi.c b/extmod/modTrezorUi/modTrezorUi.c
index f1e050544..96f9c3355 100644
--- a/extmod/modTrezorUi/modTrezorUi.c
+++ b/extmod/modTrezorUi/modTrezorUi.c
@@ -187,7 +187,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_make_new(const mp_obj_type_t *type, size_t
     return MP_OBJ_FROM_PTR(o);
 }
 
-// def Display.bar(self, x: int, y: int, w: int, h: int, color: int) -> None:
+// def Display.bar(self, x: int, y: int, w: int, h: int, color: int) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_bar(size_t n_args, const mp_obj_t *args) {
     mp_int_t x = mp_obj_get_int(args[1]);
     mp_int_t y = mp_obj_get_int(args[2]);
@@ -202,7 +202,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_bar(size_t n_args, const mp_obj_t *args) {
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUi_Display_bar_obj, 6, 6, mod_TrezorUi_Display_bar);
 
-// def Display.blit(self, x: int, y: int, w: int, h: int, data: bytes) -> None:
+// def Display.blit(self, x: int, y: int, w: int, h: int, data: bytes) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_blit(size_t n_args, const mp_obj_t *args) {
     mp_int_t x = mp_obj_get_int(args[1]);
     mp_int_t y = mp_obj_get_int(args[2]);
@@ -218,7 +218,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_blit(size_t n_args, const mp_obj_t *args) {
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUi_Display_blit_obj, 6, 6, mod_TrezorUi_Display_blit);
 
-// def Display.image(self, x: int, y: int, image: bytes) -> None:
+// def Display.image(self, x: int, y: int, image: bytes) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_image(size_t n_args, const mp_obj_t *args) {
     mp_int_t x = mp_obj_get_int(args[1]);
     mp_int_t y = mp_obj_get_int(args[2]);
@@ -238,7 +238,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_image(size_t n_args, const mp_obj_t *args)
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUi_Display_image_obj, 4, 4, mod_TrezorUi_Display_image);
 
-// def Display.icon(self, x: int, y: int, icon: bytes, fgcolor: int, bgcolor: int) -> None:
+// def Display.icon(self, x: int, y: int, icon: bytes, fgcolor: int, bgcolor: int) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_icon(size_t n_args, const mp_obj_t *args) {
     mp_int_t x = mp_obj_get_int(args[1]);
     mp_int_t y = mp_obj_get_int(args[2]);
@@ -260,7 +260,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_icon(size_t n_args, const mp_obj_t *args) {
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUi_Display_icon_obj, 6, 6, mod_TrezorUi_Display_icon);
 
-// def Display.text(self, x: int, y: int, text: bytes, font: int, fgcolor: int, bgcolor: int) -> None:
+// def Display.text(self, x: int, y: int, text: bytes, font: int, fgcolor: int, bgcolor: int) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_text(size_t n_args, const mp_obj_t *args) {
     mp_int_t x = mp_obj_get_int(args[1]);
     mp_int_t y = mp_obj_get_int(args[2]);
@@ -274,7 +274,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_text(size_t n_args, const mp_obj_t *args) {
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUi_Display_text_obj, 7, 7, mod_TrezorUi_Display_text);
 
-// def Display.text(self, degrees: int) -> None:
+// def Display.orientation(self, degrees: int) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_orientation(mp_obj_t self, mp_obj_t degrees) {
     mp_int_t deg = mp_obj_get_int(degrees);
     if (deg != 0 && deg != 90 && deg != 180 && deg != 270) {
@@ -285,7 +285,7 @@ STATIC mp_obj_t mod_TrezorUi_Display_orientation(mp_obj_t self, mp_obj_t degrees
 }
 MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorUi_Display_orientation_obj, mod_TrezorUi_Display_orientation);
 
-// def Display.rawcmd(self, reg: int, data: bytes) -> None:
+// def Display.rawcmd(self, reg: int, data: bytes) -> None
 STATIC mp_obj_t mod_TrezorUi_Display_rawcmd(mp_obj_t self, mp_obj_t reg, mp_obj_t data) {
     mp_int_t r = mp_obj_get_int(reg);
     mp_buffer_info_t bufinfo;
@@ -295,6 +295,13 @@ STATIC mp_obj_t mod_TrezorUi_Display_rawcmd(mp_obj_t self, mp_obj_t reg, mp_obj_
 }
 MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorUi_Display_rawcmd_obj, mod_TrezorUi_Display_rawcmd);
 
+// def Display.backlight(self, val: int) -> None
+STATIC mp_obj_t mod_TrezorUi_Display_backlight(mp_obj_t self, mp_obj_t reg) {
+    display_backlight(mp_obj_get_int(reg));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorUi_Display_backlight_obj, mod_TrezorUi_Display_backlight);
+
 // Display stuff
 
 STATIC const mp_rom_map_elem_t mod_TrezorUi_Display_locals_dict_table[] = {
@@ -305,6 +312,7 @@ STATIC const mp_rom_map_elem_t mod_TrezorUi_Display_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_text), MP_ROM_PTR(&mod_TrezorUi_Display_text_obj) },
     { MP_ROM_QSTR(MP_QSTR_orientation), MP_ROM_PTR(&mod_TrezorUi_Display_orientation_obj) },
     { MP_ROM_QSTR(MP_QSTR_rawcmd), MP_ROM_PTR(&mod_TrezorUi_Display_rawcmd_obj) },
+    { MP_ROM_QSTR(MP_QSTR_backlight), MP_ROM_PTR(&mod_TrezorUi_Display_backlight_obj) },
 };
 STATIC MP_DEFINE_CONST_DICT(mod_TrezorUi_Display_locals_dict, mod_TrezorUi_Display_locals_dict_table);
 
@@ -327,21 +335,21 @@ STATIC mp_obj_t mod_TrezorUi_Touch_make_new(const mp_obj_type_t *type, size_t n_
     return MP_OBJ_FROM_PTR(o);
 }
 
-// def Touch.callback_start(self, callback) -> None:
+// def Touch.callback_start(self, callback) -> None
 STATIC mp_obj_t mod_TrezorUi_Touch_callback_start(mp_obj_t self, mp_obj_t callback) {
     touch_start_callback = callback;
     return mp_const_none;
 }
 MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorUi_Touch_callback_start_obj, mod_TrezorUi_Touch_callback_start);
 
-// def Touch.callback_move(self, callback) -> None:
+// def Touch.callback_move(self, callback) -> None
 STATIC mp_obj_t mod_TrezorUi_Touch_callback_move(mp_obj_t self, mp_obj_t callback) {
     touch_move_callback = callback;
     return mp_const_none;
 }
 MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorUi_Touch_callback_move_obj, mod_TrezorUi_Touch_callback_move);
 
-// def Touch.callback_end(self, callback) -> None:
+// def Touch.callback_end(self, callback) -> None
 STATIC mp_obj_t mod_TrezorUi_Touch_callback_end(mp_obj_t self, mp_obj_t callback) {
     touch_end_callback = callback;
     return mp_const_none;
@@ -380,5 +388,4 @@ const mp_obj_module_t mp_module_TrezorUi = {
     .globals = (mp_obj_dict_t*)&mp_module_TrezorUi_globals,
 };
 
-
 #endif // MICROPY_PY_TREZORUI