Fig. 1. Block diagram of adjustable adaptive local dimming method

Fig. 2. JND curve

Fig. 3. LED-LCD dual modulation display prototype. (a) Display principle; (b)structural diagram of backlight panel; (c) back of prototype; (d) picture of prototype

Fig. 4. Comparison of displayed images under initial and optimal backlight. (a) Initial backlight; (b) optimal backlight

Fig. 5. Contrast results of backlight smoothing. (a) Without backlight smoothing; (b) with backlight smoothing

Fig. 6. Test images. (a) Low brightness; (b) high brightness; (c) low contrast; (d) high contrast

Fig. 7. Simulation results of different methods for low brightness image. (a) CDF; (b) LUT; (c) method in Ref. [19]; (d) proposed method

Fig. 8. Simulation results of different methods for high brightness image. (a) CDF; (b) LUT; (c) method in Ref. [19]; (d) proposed method

Fig. 9. Simulation results of different methods for low contrast image. (a) CDF; (b) LUT; (c) method in Ref. [19]; (d) proposed method

Fig. 10. Simulation results of different method for high contrast image. (a) CDF; (b) LUT; (c) method in Ref. [19]; (d) proposed method