SK hynix’s published image-sensor HDR story moves from multi-exposure methods—QHDR and sHDR—to gain-based approaches, iDCG-HDR and DAG-HDR, and then a design that combines both. The shift is aimed at preserving detail across bright and dark areas while reducing the motion artifacts that can arise when multiple exposures capture a moving scene. SK hynix presented combined DAG+iDCG HDR as its future direction in material published in 2023; that announcement does not establish which products use it today.
Why the HDR capture method matters
A camera sensor has a finite range of light levels it can record in one image. In a high-contrast scene, a short exposure can retain bright highlights but leave shadows dark, while a longer exposure can reveal shadow detail but lose highlight information. HDR methods combine or compare sensor readings so the final image can preserve more of both.
The trade-off is how the sensor obtains those readings. Capturing multiple exposures takes samples at different exposure times; if the subject or camera moves between them, the samples may not align cleanly. Gain-based methods instead change how the sensor’s signal is read or amplified. SK hynix’s published evolution is largely a progression in how it balances dynamic range, motion sensitivity, processing, and cost.
How the HDR generations differ
| Method and year | Capture and processing | Motion and dynamic-range trade-offs | Cost or device fit |
|---|---|---|---|
| QHDR (2017) | Uses a quad color-filter arrangement and multiple exposure times in a single-frame capture. The sensor performs composition and tone mapping. | Combining different exposure times can produce motion artifacts when the scene or camera moves. | Cost comparison not stated in SK hynix’s 2023 technical overview. |
| sHDR (2018) | Captures several exposure times and transfers them quickly to the application processor (AP), which composes and tone-maps the result. | Like QHDR, multiple exposure times can make moving subjects harder to combine cleanly. | Processing is shared between the sensor and AP; a cost comparison is not stated in SK hynix’s 2023 technical overview. |
| iDCG-HDR (2021–2022) | Intra-scene dual conversion gain (iDCG) produces high- and low-conversion-gain images from one exposure. | Using one exposure avoids the timing gap between separate exposure times. SK hynix says a 1:4 conversion-gain ratio can provide about 12 dB of dynamic-range improvement. | Cost comparison not stated in SK hynix’s 2023 technical overview. |
| DAG-HDR (2023) | Dual analog gain (DAG) captures two frames at different analog gains. | SK hynix describes its maximum dynamic range as lower than iDCG-HDR’s, while highlighting adjustable gain. | SK hynix identifies it as suitable for lower-cost smartphones. |
| DAG+iDCG HDR (2023) | Combines dual analog gain with dual conversion gain. | SK hynix presents the combination as a way to minimize motion artifacts and flexibly extend dynamic range. It says a 1:4 conversion-gain ratio with 16× analog gain can improve dynamic range by up to 36 dB. | A cost comparison or specific device tier is not stated in SK hynix’s 2023 technical overview. |
The dB figures in the table are SK hynix’s stated capability figures, not independently reported test results in the material cited here. They describe different configurations: about 12 dB for the stated iDCG conversion-gain ratio, and up to 36 dB for the stated combined configuration.
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From QHDR and sHDR to gain-based HDR
QHDR: sensor-side processing of multiple exposures
SK hynix introduced Quad-sensor HDR, or QHDR, in 2017. Its quad color-filter arrangement supports multiple exposure times within a single-frame capture, and the sensor composes and tone-maps the readings. Keeping that work at the sensor is a key difference from the later sHDR approach, but QHDR still depends on information gathered at different exposure times. Movement during capture can therefore complicate the combination.
sHDR: send the exposure samples to the AP
In 2018, SK hynix described sHDR as capturing several exposure times and rapidly transferring them to the application processor. The AP performs composition and tone mapping, so processing is divided between the sensor and the phone’s main image-processing system. This changes where the work happens, not the underlying multi-exposure challenge: samples taken at different times may show a moving scene in different positions.
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iDCG-HDR: two conversion gains within one exposure
SK hynix’s 2021–2022 iDCG-HDR uses high and low conversion gain within one exposure. Conversion gain concerns how the sensor converts collected charge into a voltage signal. Using the two gain readings gives the system a way to preserve information across a wider range of light levels without relying on separate exposure times. SK hynix says a 1:4 conversion-gain ratio can provide about 12 dB of dynamic-range improvement.
DAG-HDR: adjust analog gain across two frames
DAG-HDR uses two frames captured at different analog gains. Analog gain amplifies a sensor signal; changing it lets the system adapt its capture to the scene. SK hynix describes DAG-HDR as having lower maximum dynamic range than iDCG-HDR, but emphasizes adjustable gain and suitability for lower-cost smartphones. Because its method uses two frames, it is distinct from iDCG’s two gain readings from one exposure.
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Why SK hynix combines DAG and iDCG
The combined DAG+iDCG approach brings together two gain mechanisms: the conversion-gain readings of iDCG and the adjustable analog gain used by DAG. SK hynix’s 2023 material describes this combination as a way to minimize motion artifacts while flexibly extending dynamic range across shooting conditions. Its stated example—1:4 conversion gain with 16× analog gain—can improve dynamic range by up to 36 dB, according to the company.
This is a stated technical direction, not proof that every challenge disappears. SK hynix’s material does not establish a universal motion-free result, performance in every lighting condition, or a particular shipping phone or sensor using the combined design. The defensible takeaway is that the company presents combined gain control as a route to balance dynamic range and motion handling more flexibly than relying on multiple exposure times alone.
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Where Black Pearl image sensors fit
Black Pearl is SK hynix’s name for its CMOS image sensor (CIS) product line, not the name of one HDR technique. In a 2020 announcement, the company described four 1.0μm-pixel sensors spanning 8MP to 20MP, intended for different smartphone camera roles. That product context is relevant because a phone with multiple camera modules can use distinct sensors for ultra-wide, telephoto, front-facing, or flexible camera configurations; it does not establish that each sensor incorporates the HDR methods described above.
| Model | Resolution and pixel size | Announced camera role | Production status in SK hynix’s 2020 announcement |
|---|---|---|---|
| Hi-1634 | 16MP, 1.0μm | Optimized for ultra-wide cameras | Mass production reported in the 2020 announcement. |
| Hi-2021 | 20MP, 1.0μm | Optimized for ultra-wide cameras | Mass production reported in the 2020 announcement. |
| Hi-847 | 8MP, 1.0μm | Telephoto and flexible camera roles | Mass production reported in the 2020 announcement. |
| Hi-1337 | 13MP, 1.0μm | Telephoto and flexible camera roles | Production was expected in March 2020; the announcement does not confirm whether that expectation was met. |
The same 2020 announcement said SK hynix planned a 0.8μm, 48MP product for the second half of 2020. That is a historical plan, not confirmation of present availability or current shipment status. SK hynix also reported that its own research found the average number of cameras per smartphone rose from 2.2 in 2017 to 3.9 in 2020. That company-reported trend helps explain the market context for multiple sensor roles, but it does not by itself demonstrate demand for a particular Black Pearl model or HDR architecture.
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What the future direction does—and does not—tell us
Based on SK hynix’s 2023 technical overview, the direction it articulated was to combine DAG’s adjustable analog gain with iDCG’s high- and low-conversion-gain readings. The goal is more flexible dynamic-range handling while reducing the motion problems associated with combining images from different exposure times. That is a technology direction, not a verified forecast of product launches or adoption.
The public material described here is dated 2020 and 2023. It does not establish SK hynix’s 2026 shipment status, current smartphone design wins, licensing terms, or a public affiliate or referral program. Nor does it show that a consumer can buy the proprietary HDR architecture as a standalone retail product. Those questions require current company disclosures or product documentation.
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