Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

2020-08-02 20:00:14 0 Comment 985 views

When the novelist Hao Jingfang wrote the popular science fiction novel "Beijing Folding" in 2012, perhaps he did not realize that "folding" was actual

When the novelist Hao Jingfang wrote the well-known science fiction novel "Beijing Folding" in 2012, perhaps he did not realize that "folding" is actually close to us.

In the past two years, with the rapid development of human engineering technology, digital products with foldable screens have begun to meet with ordinary consumers. Especially with the exposure of Huawei and Samsung's foldable phones and even the launch of small batches, the public is once again full of interest in the topic of "folding".

Due to application scenarios and other reasons, consumer electronics products with foldable screens have previously appeared in the mobile phone field. Therefore, when it was reported in June 2019 that Hisense would release a "stacked screen TV", it caused countless speculations-according to most people's understanding, "stacked screen" is a folding screen, that is, a TV with a foldable screen.

But the profoundness of Chinese has opened up to peopleA little joke.

Hisense’s “stacked screen TV” does not refer to a TV whose screen can be folded (in fact, for most TV sets that are only used in a home environment, folding does not make any sense), and It is a TV that uses a special LCD panel-compared with ordinary LCD TVs, the LCD panel of a multi-screen TV is a double-layer liquid crystal superimposed structure. The so-called "stacked screen" refers to "superimposition", not "folding".

Next, let’s talk about why we should superimpose a layer of LCD panel on a good LCD TV, what are the benefits of doing so, and our analysis of the future market positioning and trend of stacked screen TVs.

Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

Official renderings of Hisense Overlay TV

● Why “superimpose” the screen? p>

It has been forty to fifty years since LCD TVs were invented, and it has been more than ten years since they entered ordinary households on a large scale. In these decades, LCD TVs have become bigger and bigger. The thinner it is, the lower the power consumption, and the better the picture quality, which firmly occupy the vast majority of the market share of flat-panel TVs.

Since the development of LCD TVs, the performance has already been It has reached a highly mature stage. Even the more popular HDR technology in the past two years is still4K/8K technology, it is difficult for LCDs to achieve particularly big breakthroughs in the most critical areas that determine image quality, such as contrast, dynamic range, color gamut, color accuracy, and so on.

In this context, the overlay TV came into being.

Friends who know a little bit about LCD TVs may know that most top LCD TVs from major manufacturers such as Sony use a direct-lit backlight layout, and a TV may have thousands of backlight LED particles. When the TV displays a dynamic picture, each LED backlight particle will adjust the brightness of the light according to the image change of its corresponding area, so that the entire picture will eventually reach the contrast and dynamic range that ordinary LCD TVs are difficult to achieve, and finally get the picture quality Significant improvement.

But the main problem with this model is that when the TV's LED particles reach a certain number, heat dissipation will become a serious problem. In addition, to preventInterference between individual LED particles has an upper limit on its density, and it is impossible to achieve complete point-to-point backlight control. At the same time, direct-lit LEDs require a certain light mixing distance, which also causes the screen thickness to be much thicker than ordinary LCD TVs.

The practice of Hisense's stacked-screen TV is to superimpose another LCD screen under the normal LCD panel. This layer of liquid crystal replaces the traditional direct-lit LED backlight to achieve Local Dimming, that is, backlight area control.

Simply put, a multi-screen TV is equivalent to superimposing a monochromatic LCD screen that can only display black and white under a 4K LCD panel. The light control function undertaken by the direct-lit LED backlight in the past is adjusted by this newly added LCD panel. Hisense uses 5 chips for collaborative control of the backlight layer, light control layer and liquid crystal panel layer. The core part is Hisense’s self-developed overlay control algorithm. The light control accuracy can reach sub-pixel level., The resolution is equal to 1920×1080, so the whole machine has more prominent advantages than ordinary direct-lit LED TVs in the precision and accuracy of light control.

Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

Through the superposition of double-layer panels, the final product has the best quality The core contrast index has been significantly improved. According to the test data of the very authoritative China Electronics Standardization Institute in the industry,The peak brightness of Hisense U9E with stacked screen technology can reach 890cd/㎡, and the dark field brightness is as low as 0.0005cd/㎡; the contrast ratio can reach 150,000:1, which has exceeded the usual dynamic range of brightness of OLED TVs; in addition, the color of stacked screen TVs The domain range can reach 95.4% of DCI-P3, and the color accuracy is far beyond the current mainstream LCD TV level.

● Are there any side effects after the screen "superimposes"?

Although the overlap of the two screens has made the picture quality a leap, many people question whether it will bring some side effects, such as whether the thickness of the TV will become too thick , Will it double the power consumption of the TV? At the same time, will the price be much more expensive than ordinary LCD TVs.

Hisense Chief Scientist Dr. Liu Weidong is answeringWhen asking questions, the advantages and disadvantages of the stacked screen TV were also answered.

Liu Weidong said that although the stacked-screen TV uses two-layer panels, it is not simply a matter of superimposing the two-layer LCD panels directly from the microstructure. Only a layer of polarized light is added between the two LCD panels. Compared with the conventional liquid crystal panel, this new liquid crystal structure does not need to be equipped with color filters and other structures, so its thickness will only increase by 1.8mm compared with ordinary liquid crystals. At the same time, due to the LED backlight part There is no need to increase significantly (due to the addition of a layer of panel, the light transmittance is lost, the backlight brightness still needs to be increased to compensate), even if some more power is consumed to drive the newly added LCD screen, the whole The power consumption of the machine is not a simple 1+1 improvement, and it can still meet the relevant national equivalent level requirements.

As for the price issue that consumers are very concerned about, the 65The U9E’s listing price is 17,999 yuan, which is indeed several times more expensive than ordinary LCD TVs of the same size, and even more expensive than Sony’s latest 65-inch flagship LCD TV X9500G at 14,999 yuan this year. In this regard, Wang Wei, general manager of Hisense Electric Marketing Co., said frankly that at the moment when 43-inch LCD TVs have fallen below the 1,000-yuan mark, the Chinese TV market has no shortage and never lacks brands and products with lower prices. What is lacking is real energy. Fever-grade products that meet the high-end quality of life. The listing of stacked-screen TVs will also become a new starting point for Hisense and even Chinese color TV companies to move toward the high end of the industry chain.

● Is there any comparison between a stacked screen TV and an OLED?

When it comes to the opponents of multi-screen TVs, OLED TVs are absolutely impossible to bypass.

Since its birth, OLED has been dubbed ""Next-generation display technology". After recent years of market education, the vast majority of ordinary consumers have also accepted the saying that "OLED is better than LCD".

Although multi-screen TVs have excellent Display parameters have reached or surpassed the core display parameters of contrast and other OLED TVs, but in essence it is still liquid crystal display technology. If we want to surpass OLED in competition, we believe that the challenges it faces will mainly come from the industry camp. Scale, product maturity, and mass production speed of large-size models.

1. Industry camp scale: Looking back at the battle between the LCD and plasma camps that year, plasma, which has the advantage of display performance, finally lost In the next battle, the most fundamental reason is that the industry camp is closed and the scale is too small, making it difficult for product costs to continue to decline through the scale effect, and consumers have fewer and fewer choices. If the multi-screen TV is to truly make a reputation and form a shareStrength also requires the joint promotion of more color TV terminal enterprises. The stacking LCD module of Hisense's stacking screen TV is actually not produced by Hisense (BOE). In theory, other color TV companies can also produce stacking screen TVs if they want (but the differences in the stacking control algorithms of each company will lead to the product There is a certain degree of difference in the picture quality). How Hisense handles the relationship with its competitors in its multi-screen products, and expands the cake of "multi-screen TV" with its friends and upstream industry chain is the first challenge.

2. Product maturity: Compared with the traditional LCD, the multi-screen TV has a very large change in the microstructure. When the two panels are superimposed, some new materials and processes are used. Whether they can maintain sufficient stability during long-term use without significant performance degradation, these problems have yet to be tested by time.

3. Mass production speed of large-size models:One of the most important issues affecting the popularity of OLEDs is that the price has risen exponentially with the increase in size. Take Sony as an example. Its 65-inch 4K OLED model A9G is priced at 29,999 yuan, but the 77-inch model is priced at RMB 29,999. Soared directly to 59,999 yuan. If the multi-screen TV can accelerate the layout speed in the large-size field of 65 inches or more, it is of great significance to seize the commanding heights of the high-end large-screen market, including occupying the minds of high-end people, and furthering the price advantage of the amplifier in the unit size. Of course, the solution to this problem mainly depends on the mass production progress of upstream panel companies such as BOE, and terminal companies have relatively little room to play in it.

Conclusion: What is the secret of Hisense's stacked screen TV?

Regardless of the future market prospects of stacked-screen TVs, from a purely product and technical point of view, the seaThe multi-screen TV launched by Xinxin is indeed quite a truly innovative product in the field of flat panel displays in recent years. And Hisense's own positioning of this product is quite mysterious.

Although Hisense often uses OLED as a reference object when introducing the advantages of multi-screen TVs, he chose Sony’s latest flagship LCD X9500G this year for on-site PK when performing physical displays. This actually reflects Hisense's positioning of this TV-the best LCD TV in the industry.

Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

In fact, in Sony’s product line, X9500G is not really a flagship LCD in the true sense-whether it is the previous Z9D This year’s new Z9G is the flagship LCD in the true sense. However, the Z9D has been discontinued due to the long launch time, and the new 8K Z9G series has only two ultra-large sizes of 85 and 98, which is a bit far away from ordinary users. Therefore, Hisense chose the X9500G with a similar price and a more comprehensive configuration as the target of Biao. It is still the past.

Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

Regarding Hisense“s “stacked screen“ TV, what are the unknown “little secrets“?

Judging from the effect of the live show, Hisense’s stacked-screen TV has greatly increased its native contrast (this has beenAfter obtaining the written certification from the authoritative organization China Electronics Standardization Institute), the picture quality performance, especially the contrast performance of the picture, is indeed much better than Sony’s products (according to the third-party experts on the spot, both products adopt Factory default settings). The difference in contrast between the two is clearly visible to the naked eye, and it is difficult to refute. In addition, due to the extremely high accuracy of backlight control of the multi-screen TV, when displaying bright objects with dark backgrounds, the edges of the image will be extremely clear, without the halo effect of ordinary LCDs. This difference is difficult to reproduce with photos, but direct AB contrast can still be more clearly perceived.

To make a TV that can surpass Sony in terms of picture quality (Note: This refers to the same level comparison, cross-technology category, cross-level comparison is not meaningful), I believe not only Hisense, but also all The common dream of TV companies. Already done at the product levelWill Hisense at this point bring us more surprises in the future? Let's wait and see together.