Types of TV displays
CRT image tube
Delta, Trinitron (Sony), In-line
TFT- LCD display
Technology: TN, DSTN
IPS, S-IPS, AS-IPS
MVA, PVA, S-PVA
Plasma display
(OLED display)
Parametrs of TV displays
1. Response time - BtW, GtG;
correction: Overdrive
2. Input lag - long S-PVA,TN,
short IPS, S-IPS
3. Obsarvation angle
4. Brightness
5. Contrast
CR = LW / LB , CM = (LW –LB) /( LW +LB)
Static Contrast
Dynamic Contrast
Full Screen Contrast
Concurrent Contrast
Ambient Contrast
Transient Contrast
6. Gamut
7. Back light (uniformity)
De-intelacing
Field Combination De-interlacing
weaving
blending
selective blending
Field Extension De-interlacing
line doubling
l.d. + elimination of second field
Combination of both methods
weaving + advanced methods of motion detection, calculation of objct
from other fields, if not possible, then selective blending or line doubling
Interlaced and Progressive Scanning
Interlaced scanning
Progressive scanning
Block diagram of TV receiver (1)
PES 1
video
memory
SDRAM
Tuner
CI
IF
demodulator
OFDM, QAM
video
decoder
TS
PES 2
audio
decoder
TS
Error
Correction
DeMux
SI/PSI
memory
(FLASH)
CI – Common Interface
VCO – Voltage Controlled Oscillator
DeMux – De Multiplexer
RTC – Real Time Clock
control signals, CLK
Control
Unit
VCO
RTC
User
interface
audio
PDP receiver
I2C bus
HDMI - High Definition Multimedia Interface
Transition Minimized Differential Signaling
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
TMDS Data2+
TMDS Data2 Shield
TMDS Data2–
TMDS Data1+
TMDS Data1 Shield
TMDS Data1–
TMDS Data0+
TMDS Data0 Shield
TMDS Data0–
TMDS Clock+
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
Pin 16
Pin 17
Pin 18
Pin 19
TMDS Clock Shield
TMDS Clock–
CEC
Reserved (N.C.)
SCL
SDA
DDC/CEC Ground
+5 V Power (max 50 mA)
Hot Plug Detect
HDMI (2)
Type A (19 pins) (comp. with Single link DVI-D), SDTV, EDTV, HDTV
Type B (29 pins) (comp. With Dual link DVI-D)
Higher resolution (WQUXGA 3840x2400), dig.cinema
Type C - see type A, lower dimensions of connector (10.42x2.42 mm)
3 independent communications channels
- DDC (Display Data Channel) – protokol I2C, 100 - 400 kb/s
-TMDS (Transient Minimized Diff. Signalling) – video data period, „data island“
period (blanking interval - audio data), control period
- CEC (Consumer Electronic Control) – control of system (Bravia Theater
Sync (Sony), Easy Link (Philips) atd.
Support of HDCP (High-bandwidth Digital Content Protection)