Driving Waveform Design of Electrophoretic Display Based on Optimized Particle Activation for a Rapid Response Speed

Electrophoretic displays (EPDs) have excellent paper-like display features, but their response speed is as long as hundreds of milliseconds. This is particularly important when optimizing the driving waveform for improving the response speed. Hence, a driving waveform design based on the optimization of particle activation was proposed by analyzing the electrophoresis performance of particles in EPD pixels. The particle activation in the driving waveform was divided into two phases: the improving particle activity phase and the uniform reference grayscale phase. First, according to the motion characteristics of particles in improving the particle activity phase, the real-time EPD brightness value can be obtained by an optical testing device. Secondly, the derivative of the EPD brightness curve was used to obtain the inflection point, and the inflection point was used as the duration of improving particle activity phase. Thirdly, the brightness curve of the uniform reference grayscale phase was studied to set the driving duration for obtaining a white reference grayscale. Finally, a set of four-level grayscale driving waveform was designed and validated in a commercial E-ink EPD. The experimental results showed that the proposed driving waveform can cause a reduction by 180 ms in improving particle activity phase and 120 ms in uniform reference grayscale phase effectively, and a unified reference grayscale can be achieved in uniform reference grayscale phase at the same time.

Lens Detection Technology and its Machining Allowance Prediction Based on MATLAB

The detection of lens’ surface smoothness is an important technical problem in the production practice. Through analysis the recognition characteristics of lens, the Newton Ring interference fringe of planoconvex lens is simulated by MATLAB first. Stripe brightness curve is analysis based on improfile function method, and the brightness standard curve of ideal lens system is established. Through comparison the brightness curve produced by Newton Ring of standard lens and the sample, the flatness of the lens surface and defect depth or bump height are assessed. This method is easy to application and has higher adaptability to environment. It provides a new method for the detection of lens’ surface smoothness.

Vehicle Occlusion Detection and Segment Based on Windows

This paper proposes a method of vehicle occlusion detection and segment based on windows of the vehicle, which is used in high-definition (HD) video. Firstly, do the vehicle position after extract the background using the method of continuous frame differential method. Then draw brightness curve of the positioning region and set the threshold to segment the region of windows. From the number of windows we can judge whether vehicle occlusion is happen and do the next step. Experiments show that this method is simple and effective, with less computation, and it can divide occluded vehicles effectively, and satisfy the requirements of real-time processing.

Equivalent Brightness Fitting Calculation Method about White LEDs

White LEDs can show different correlated color temperature (abbreviated as CCT) by adjusting the luminous spectrum peak distribution and relative strength. Recent research results indicate that spectral luminous efficiency function of mesopic vision Vmes(λ) and equivalent brightness are associated with luminous spectra of light sources. A series of white LEDs with different CCT are tested and calculated, it shows white LED with higher CCT has higher mesopic vision equivalent brightness, although the brightness are identical when the tester corrected by traditional photopic vision spectral luminous efficiency V(λ). From the equivalent brightness curve fitting, the curve can be described as a polynomial function, for it excellent correlation, the more value of equivalent brightness could be calculated without complex derivation.

Comparison of Various Hardwood Kraft Pulp Pre-Bleaching Techniques

We examined five pre-bleaching methods with the same starting hardwood kraft brownstock pulp to determine their effects on reducing bleaching costs. Each pretreated pulp was subjected to a D(EP)D bleaching sequence. A D1 brightness curve as a function of the percent applied chlorine dioxide (ClO2) was obtained for each of these pre-bleaching methods and for a baseline pulp sample. For each of the pre-bleaching methods, we calculated the amount of ClO2 required to obtain D1 stage 79.1% ISO brightness and determined the net cost savings for each sequence. Pre-bleaching methods that produced a net savings in the D1 stage were also subjected to a four-stage bleaching sequence of D(EP)DD to 89%ISO brightness. We also determined net cost savings resulting from pretreat-ment of the fully bleached pulps. The methods examined were mild acid pretreatment, xylanase enzyme pre-bleach-ing, brownstock peroxide pretreatment, acidic brownstock peroxide treatment, and xylanase enzyme followed by acidic peroxide pretreatment. Enzyme pretreatment and small applications of acidic peroxide pretreatment resulted in net D1 stage cost savings at 79.1% ISO brightness. Only enzyme pretreatment resulted in a net savings at 89% ISO.